switch to use gliderlabs/ssh for builtin server (#7250)
resolves git conflicts from #3896 (credit to @belak, in case github doesn't keep original author during squash) Co-Authored-By: Matti Ranta <techknowlogick@gitea.io>
This commit is contained in:
techknowlogick
GitHub
parent
c44f0b1c76
commit
d0ec940dd7
8
go.mod
8
go.mod
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@ -40,7 +40,7 @@ require (
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github.com/facebookgo/stack v0.0.0-20160209184415-751773369052 // indirect
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github.com/facebookgo/stats v0.0.0-20151006221625-1b76add642e4 // indirect
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github.com/facebookgo/subset v0.0.0-20150612182917-8dac2c3c4870 // indirect
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github.com/gliderlabs/ssh v0.1.4 // indirect
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github.com/gliderlabs/ssh v0.2.2
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github.com/glycerine/go-unsnap-stream v0.0.0-20180323001048-9f0cb55181dd // indirect
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github.com/glycerine/goconvey v0.0.0-20190315024820-982ee783a72e // indirect
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github.com/go-macaron/binding v0.0.0-20160711225916-9440f336b443
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@ -110,11 +110,11 @@ require (
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github.com/yohcop/openid-go v0.0.0-20160914080427-2c050d2dae53
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go.etcd.io/bbolt v1.3.2 // indirect
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golang.org/x/crypto v0.0.0-20190618222545-ea8f1a30c443
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golang.org/x/net v0.0.0-20190613194153-d28f0bde5980
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golang.org/x/net v0.0.0-20190619014844-b5b0513f8c1b
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golang.org/x/oauth2 v0.0.0-20181101160152-c453e0c75759
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golang.org/x/sys v0.0.0-20190618155005-516e3c20635f
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golang.org/x/sys v0.0.0-20190620070143-6f217b454f45
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golang.org/x/text v0.3.2
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golang.org/x/tools v0.0.0-20190618163018-fdf1049a943a // indirect
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golang.org/x/tools v0.0.0-20190620154339-431033348dd0 // indirect
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gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc // indirect
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gopkg.in/asn1-ber.v1 v1.0.0-20150924051756-4e86f4367175 // indirect
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gopkg.in/bufio.v1 v1.0.0-20140618132640-567b2bfa514e // indirect
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16
go.sum
16
go.sum
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@ -100,8 +100,8 @@ github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568/go.mod h1:xEzjJPgXI
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github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
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github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
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github.com/gliderlabs/ssh v0.1.3/go.mod h1:U7qILu1NlMHj9FlMhZLlkCdDnU1DBEAqr0aevW3Awn0=
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github.com/gliderlabs/ssh v0.1.4 h1:5N8AYXpaQAPy0L7linKa5aI+WRfyYagAhjksVzxh+mI=
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github.com/gliderlabs/ssh v0.1.4/go.mod h1:U7qILu1NlMHj9FlMhZLlkCdDnU1DBEAqr0aevW3Awn0=
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github.com/gliderlabs/ssh v0.2.2 h1:6zsha5zo/TWhRhwqCD3+EarCAgZ2yN28ipRnGPnwkI0=
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github.com/gliderlabs/ssh v0.2.2/go.mod h1:U7qILu1NlMHj9FlMhZLlkCdDnU1DBEAqr0aevW3Awn0=
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github.com/glycerine/go-unsnap-stream v0.0.0-20180323001048-9f0cb55181dd h1:r04MMPyLHj/QwZuMJ5+7tJcBr1AQjpiAK/rZWRrQT7o=
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github.com/glycerine/go-unsnap-stream v0.0.0-20180323001048-9f0cb55181dd/go.mod h1:/20jfyN9Y5QPEAprSgKAUr+glWDY39ZiUEAYOEv5dsE=
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github.com/glycerine/goconvey v0.0.0-20190315024820-982ee783a72e h1:SiEs4J3BKVIeaWrH3tKaz3QLZhJ68iJ/A4xrzIoE5+Y=
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@ -369,8 +369,8 @@ golang.org/x/net v0.0.0-20181114220301-adae6a3d119a/go.mod h1:mL1N/T3taQHkDXs73r
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golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
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golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
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golang.org/x/net v0.0.0-20190502183928-7f726cade0ab/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
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golang.org/x/net v0.0.0-20190613194153-d28f0bde5980 h1:dfGZHvZk057jK2MCeWus/TowKpJ8y4AmooUzdBSR9GU=
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golang.org/x/net v0.0.0-20190613194153-d28f0bde5980/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
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golang.org/x/net v0.0.0-20190619014844-b5b0513f8c1b h1:lkjdUzSyJ5P1+eal9fxXX9Xg2BTfswsonKUse48C0uE=
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golang.org/x/net v0.0.0-20190619014844-b5b0513f8c1b/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
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golang.org/x/oauth2 v0.0.0-20180620175406-ef147856a6dd/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
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golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
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golang.org/x/oauth2 v0.0.0-20181101160152-c453e0c75759 h1:TMrx+Qdx7uJAeUbv15N72h5Hmyb5+VDjEiMufAEAM04=
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@ -395,15 +395,15 @@ golang.org/x/sys v0.0.0-20190403152447-81d4e9dc473e h1:nFYrTHrdrAOpShe27kaFHjsqY
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golang.org/x/sys v0.0.0-20190403152447-81d4e9dc473e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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golang.org/x/sys v0.0.0-20190618155005-516e3c20635f h1:dHNZYIYdq2QuU6w73vZ/DzesPbVlZVYZTtTZmrnsbQ8=
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golang.org/x/sys v0.0.0-20190618155005-516e3c20635f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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golang.org/x/sys v0.0.0-20190620070143-6f217b454f45 h1:Dl2hc890lrizvUppGbRWhnIh2f8jOTCQpY5IKWRS0oM=
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golang.org/x/sys v0.0.0-20190620070143-6f217b454f45/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
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golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
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golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
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golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
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golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
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golang.org/x/tools v0.0.0-20190618163018-fdf1049a943a h1:aQmaYPOmKItb96VioBrTlYay5tSNUdKAFEhPCWMeLSM=
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golang.org/x/tools v0.0.0-20190618163018-fdf1049a943a/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
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golang.org/x/tools v0.0.0-20190620154339-431033348dd0 h1:qUGDNmGEM+ZBtwF9vuzEv+9nQQPL+l/oNBZ+DCDTAyo=
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golang.org/x/tools v0.0.0-20190620154339-431033348dd0/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
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google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
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google.golang.org/appengine v1.2.0 h1:S0iUepdCWODXRvtE+gcRDd15L+k+k1AiHlMiMjefH24=
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google.golang.org/appengine v1.2.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
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@ -34,6 +34,7 @@ LFS_CONTENT_PATH = data/lfs-mssql
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OFFLINE_MODE = false
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LFS_JWT_SECRET = Tv_MjmZuHqpIY6GFl12ebgkRAMt4RlWt0v4EHKSXO0w
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APP_DATA_PATH = integrations/gitea-integration-mssql/data
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BUILTIN_SSH_SERVER_USER = git
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[mailer]
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ENABLED = true
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@ -34,6 +34,7 @@ LFS_CONTENT_PATH = data/lfs-mysql
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OFFLINE_MODE = false
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LFS_JWT_SECRET = Tv_MjmZuHqpIY6GFl12ebgkRAMt4RlWt0v4EHKSXO0w
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APP_DATA_PATH = integrations/gitea-integration-mysql/data
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BUILTIN_SSH_SERVER_USER = git
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[mailer]
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ENABLED = true
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@ -34,6 +34,7 @@ LFS_CONTENT_PATH = data/lfs-mysql8
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OFFLINE_MODE = false
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LFS_JWT_SECRET = Tv_MjmZuHqpIY6GFl12ebgkRAMt4RlWt0v4EHKSXO0w
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APP_DATA_PATH = integrations/gitea-integration-mysql8/data
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BUILTIN_SSH_SERVER_USER = git
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[mailer]
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ENABLED = false
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@ -34,6 +34,7 @@ LFS_CONTENT_PATH = data/lfs-pgsql
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OFFLINE_MODE = false
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LFS_JWT_SECRET = Tv_MjmZuHqpIY6GFl12ebgkRAMt4RlWt0v4EHKSXO0w
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APP_DATA_PATH = integrations/gitea-integration-pgsql/data
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BUILTIN_SSH_SERVER_USER = git
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[mailer]
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ENABLED = true
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@ -73,7 +73,7 @@ func TestViewRepo1CloneLinkAuthorized(t *testing.T) {
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assert.Equal(t, setting.AppURL+"user2/repo1.git", link)
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link, exists = htmlDoc.doc.Find("#repo-clone-ssh").Attr("data-link")
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assert.True(t, exists, "The template has changed")
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sshURL := fmt.Sprintf("ssh://%s@%s:%d/user2/repo1.git", setting.RunUser, setting.SSH.Domain, setting.SSH.Port)
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sshURL := fmt.Sprintf("ssh://%s@%s:%d/user2/repo1.git", setting.SSH.BuiltinServerUser, setting.SSH.Domain, setting.SSH.Port)
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assert.Equal(t, sshURL, link)
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}
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@ -31,6 +31,7 @@ OFFLINE_MODE = false
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LFS_JWT_SECRET = Tv_MjmZuHqpIY6GFl12ebgkRAMt4RlWt0v4EHKSXO0w
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APP_DATA_PATH = integrations/gitea-integration-sqlite/data
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ENABLE_GZIP = true
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BUILTIN_SSH_SERVER_USER = git
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[mailer]
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ENABLED = true
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@ -1,4 +1,3 @@
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// Copyright 2014 The Gogs Authors. All rights reserved.
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// Copyright 2017 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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@ -10,178 +9,157 @@ import (
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"crypto/rsa"
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"crypto/x509"
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"encoding/pem"
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"fmt"
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"io"
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"io/ioutil"
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"net"
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"os"
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"os/exec"
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"path/filepath"
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"strings"
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"github.com/Unknwon/com"
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"golang.org/x/crypto/ssh"
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"sync"
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"syscall"
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"code.gitea.io/gitea/models"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/setting"
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"github.com/Unknwon/com"
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"github.com/gliderlabs/ssh"
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gossh "golang.org/x/crypto/ssh"
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)
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func cleanCommand(cmd string) string {
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i := strings.Index(cmd, "git")
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if i == -1 {
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return cmd
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}
|
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return cmd[i:]
|
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}
|
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type contextKey string
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|
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func handleServerConn(keyID string, chans <-chan ssh.NewChannel) {
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for newChan := range chans {
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if newChan.ChannelType() != "session" {
|
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err := newChan.Reject(ssh.UnknownChannelType, "unknown channel type")
|
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if err != nil {
|
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log.Error("Error rejecting channel: %v", err)
|
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}
|
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continue
|
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const giteaKeyID = contextKey("gitea-key-id")
|
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|
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func getExitStatusFromError(err error) int {
|
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if err == nil {
|
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return 0
|
||||
}
|
||||
|
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exitErr, ok := err.(*exec.ExitError)
|
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if !ok {
|
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return 1
|
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}
|
||||
|
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waitStatus, ok := exitErr.Sys().(syscall.WaitStatus)
|
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if !ok {
|
||||
// This is a fallback and should at least let us return something useful
|
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// when running on Windows, even if it isn't completely accurate.
|
||||
if exitErr.Success() {
|
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return 0
|
||||
}
|
||||
|
||||
ch, reqs, err := newChan.Accept()
|
||||
if err != nil {
|
||||
log.Error("Error accepting channel: %v", err)
|
||||
continue
|
||||
}
|
||||
|
||||
go func(in <-chan *ssh.Request) {
|
||||
defer func() {
|
||||
if err = ch.Close(); err != nil {
|
||||
log.Error("Close: %v", err)
|
||||
}
|
||||
}()
|
||||
for req := range in {
|
||||
payload := cleanCommand(string(req.Payload))
|
||||
switch req.Type {
|
||||
case "exec":
|
||||
cmdName := strings.TrimLeft(payload, "'()")
|
||||
log.Trace("SSH: Payload: %v", cmdName)
|
||||
|
||||
args := []string{"serv", "key-" + keyID, "--config=" + setting.CustomConf}
|
||||
log.Trace("SSH: Arguments: %v", args)
|
||||
cmd := exec.Command(setting.AppPath, args...)
|
||||
cmd.Env = append(
|
||||
os.Environ(),
|
||||
"SSH_ORIGINAL_COMMAND="+cmdName,
|
||||
"SKIP_MINWINSVC=1",
|
||||
)
|
||||
|
||||
stdout, err := cmd.StdoutPipe()
|
||||
if err != nil {
|
||||
log.Error("SSH: StdoutPipe: %v", err)
|
||||
return
|
||||
}
|
||||
stderr, err := cmd.StderrPipe()
|
||||
if err != nil {
|
||||
log.Error("SSH: StderrPipe: %v", err)
|
||||
return
|
||||
}
|
||||
input, err := cmd.StdinPipe()
|
||||
if err != nil {
|
||||
log.Error("SSH: StdinPipe: %v", err)
|
||||
return
|
||||
}
|
||||
|
||||
// FIXME: check timeout
|
||||
if err = cmd.Start(); err != nil {
|
||||
log.Error("SSH: Start: %v", err)
|
||||
return
|
||||
}
|
||||
|
||||
err = req.Reply(true, nil)
|
||||
if err != nil {
|
||||
log.Error("SSH: Reply: %v", err)
|
||||
}
|
||||
go func() {
|
||||
_, err = io.Copy(input, ch)
|
||||
if err != nil {
|
||||
log.Error("SSH: Copy: %v", err)
|
||||
}
|
||||
}()
|
||||
_, err = io.Copy(ch, stdout)
|
||||
if err != nil {
|
||||
log.Error("SSH: Copy: %v", err)
|
||||
}
|
||||
_, err = io.Copy(ch.Stderr(), stderr)
|
||||
if err != nil {
|
||||
log.Error("SSH: Copy: %v", err)
|
||||
}
|
||||
|
||||
if err = cmd.Wait(); err != nil {
|
||||
log.Error("SSH: Wait: %v", err)
|
||||
return
|
||||
}
|
||||
|
||||
_, err = ch.SendRequest("exit-status", false, []byte{0, 0, 0, 0})
|
||||
if err != nil {
|
||||
log.Error("SSH: SendRequest: %v", err)
|
||||
}
|
||||
return
|
||||
default:
|
||||
}
|
||||
}
|
||||
}(reqs)
|
||||
return 1
|
||||
}
|
||||
|
||||
return waitStatus.ExitStatus()
|
||||
}
|
||||
|
||||
func listen(config *ssh.ServerConfig, host string, port int) {
|
||||
listener, err := net.Listen("tcp", host+":"+com.ToStr(port))
|
||||
func sessionHandler(session ssh.Session) {
|
||||
keyID := session.Context().Value(giteaKeyID).(int64)
|
||||
|
||||
command := session.RawCommand()
|
||||
|
||||
log.Trace("SSH: Payload: %v", command)
|
||||
|
||||
args := []string{"serv", "key-" + com.ToStr(keyID), "--config=" + setting.CustomConf}
|
||||
log.Trace("SSH: Arguments: %v", args)
|
||||
cmd := exec.Command(setting.AppPath, args...)
|
||||
cmd.Env = append(
|
||||
os.Environ(),
|
||||
"SSH_ORIGINAL_COMMAND="+command,
|
||||
"SKIP_MINWINSVC=1",
|
||||
)
|
||||
|
||||
stdout, err := cmd.StdoutPipe()
|
||||
if err != nil {
|
||||
log.Fatal("Failed to start SSH server: %v", err)
|
||||
log.Error("SSH: StdoutPipe: %v", err)
|
||||
return
|
||||
}
|
||||
for {
|
||||
// Once a ServerConfig has been configured, connections can be accepted.
|
||||
conn, err := listener.Accept()
|
||||
if err != nil {
|
||||
log.Error("SSH: Error accepting incoming connection: %v", err)
|
||||
continue
|
||||
stderr, err := cmd.StderrPipe()
|
||||
if err != nil {
|
||||
log.Error("SSH: StderrPipe: %v", err)
|
||||
return
|
||||
}
|
||||
stdin, err := cmd.StdinPipe()
|
||||
if err != nil {
|
||||
log.Error("SSH: StdinPipe: %v", err)
|
||||
return
|
||||
}
|
||||
|
||||
wg := &sync.WaitGroup{}
|
||||
wg.Add(2)
|
||||
|
||||
if err = cmd.Start(); err != nil {
|
||||
log.Error("SSH: Start: %v", err)
|
||||
return
|
||||
}
|
||||
|
||||
go func() {
|
||||
defer stdin.Close()
|
||||
if _, err := io.Copy(stdin, session); err != nil {
|
||||
log.Error("Failed to write session to stdin. %s", err)
|
||||
}
|
||||
}()
|
||||
|
||||
// Before use, a handshake must be performed on the incoming net.Conn.
|
||||
// It must be handled in a separate goroutine,
|
||||
// otherwise one user could easily block entire loop.
|
||||
// For example, user could be asked to trust server key fingerprint and hangs.
|
||||
go func() {
|
||||
log.Trace("SSH: Handshaking for %s", conn.RemoteAddr())
|
||||
sConn, chans, reqs, err := ssh.NewServerConn(conn, config)
|
||||
if err != nil {
|
||||
if err == io.EOF {
|
||||
log.Warn("SSH: Handshaking with %s was terminated: %v", conn.RemoteAddr(), err)
|
||||
} else {
|
||||
log.Error("SSH: Error on handshaking with %s: %v", conn.RemoteAddr(), err)
|
||||
}
|
||||
return
|
||||
}
|
||||
go func() {
|
||||
defer wg.Done()
|
||||
if _, err := io.Copy(session, stdout); err != nil {
|
||||
log.Error("Failed to write stdout to session. %s", err)
|
||||
}
|
||||
}()
|
||||
|
||||
log.Trace("SSH: Connection from %s (%s)", sConn.RemoteAddr(), sConn.ClientVersion())
|
||||
// The incoming Request channel must be serviced.
|
||||
go ssh.DiscardRequests(reqs)
|
||||
go handleServerConn(sConn.Permissions.Extensions["key-id"], chans)
|
||||
}()
|
||||
go func() {
|
||||
defer wg.Done()
|
||||
if _, err := io.Copy(session.Stderr(), stderr); err != nil {
|
||||
log.Error("Failed to write stderr to session. %s", err)
|
||||
}
|
||||
}()
|
||||
|
||||
// Ensure all the output has been written before we wait on the command
|
||||
// to exit.
|
||||
wg.Wait()
|
||||
|
||||
// Wait for the command to exit and log any errors we get
|
||||
err = cmd.Wait()
|
||||
if err != nil {
|
||||
log.Error("SSH: Wait: %v", err)
|
||||
}
|
||||
|
||||
if err := session.Exit(getExitStatusFromError(err)); err != nil {
|
||||
log.Error("Session failed to exit. %s", err)
|
||||
}
|
||||
}
|
||||
|
||||
func publicKeyHandler(ctx ssh.Context, key ssh.PublicKey) bool {
|
||||
if ctx.User() != setting.SSH.BuiltinServerUser {
|
||||
return false
|
||||
}
|
||||
|
||||
pkey, err := models.SearchPublicKeyByContent(strings.TrimSpace(string(gossh.MarshalAuthorizedKey(key))))
|
||||
if err != nil {
|
||||
log.Error("SearchPublicKeyByContent: %v", err)
|
||||
return false
|
||||
}
|
||||
|
||||
ctx.SetValue(giteaKeyID, pkey.ID)
|
||||
|
||||
return true
|
||||
}
|
||||
|
||||
// Listen starts a SSH server listens on given port.
|
||||
func Listen(host string, port int, ciphers []string, keyExchanges []string, macs []string) {
|
||||
config := &ssh.ServerConfig{
|
||||
Config: ssh.Config{
|
||||
Ciphers: ciphers,
|
||||
KeyExchanges: keyExchanges,
|
||||
MACs: macs,
|
||||
},
|
||||
PublicKeyCallback: func(conn ssh.ConnMetadata, key ssh.PublicKey) (*ssh.Permissions, error) {
|
||||
pkey, err := models.SearchPublicKeyByContent(strings.TrimSpace(string(ssh.MarshalAuthorizedKey(key))))
|
||||
if err != nil {
|
||||
log.Error("SearchPublicKeyByContent: %v", err)
|
||||
return nil, err
|
||||
}
|
||||
return &ssh.Permissions{Extensions: map[string]string{"key-id": com.ToStr(pkey.ID)}}, nil
|
||||
// TODO: Handle ciphers, keyExchanges, and macs
|
||||
|
||||
srv := ssh.Server{
|
||||
Addr: fmt.Sprintf("%s:%d", host, port),
|
||||
PublicKeyHandler: publicKeyHandler,
|
||||
Handler: sessionHandler,
|
||||
|
||||
// We need to explicitly disable the PtyCallback so text displays
|
||||
// properly.
|
||||
PtyCallback: func(ctx ssh.Context, pty ssh.Pty) bool {
|
||||
return false
|
||||
},
|
||||
}
|
||||
|
||||
|
|
@ -197,20 +175,21 @@ func Listen(host string, port int, ciphers []string, keyExchanges []string, macs
|
|||
if err != nil {
|
||||
log.Fatal("Failed to generate private key: %v", err)
|
||||
}
|
||||
log.Trace("SSH: New private key is generateed: %s", keyPath)
|
||||
log.Trace("New private key is generated: %s", keyPath)
|
||||
}
|
||||
|
||||
privateBytes, err := ioutil.ReadFile(keyPath)
|
||||
err := srv.SetOption(ssh.HostKeyFile(keyPath))
|
||||
if err != nil {
|
||||
log.Fatal("SSH: Failed to load private key")
|
||||
log.Error("Failed to set Host Key. %s", err)
|
||||
}
|
||||
private, err := ssh.ParsePrivateKey(privateBytes)
|
||||
if err != nil {
|
||||
log.Fatal("SSH: Failed to parse private key")
|
||||
}
|
||||
config.AddHostKey(private)
|
||||
|
||||
go listen(config, host, port)
|
||||
go func() {
|
||||
err := srv.ListenAndServe()
|
||||
if err != nil {
|
||||
log.Error("Failed to serve with builtin SSH server. %s", err)
|
||||
}
|
||||
}()
|
||||
|
||||
}
|
||||
|
||||
// GenKeyPair make a pair of public and private keys for SSH access.
|
||||
|
|
@ -238,12 +217,12 @@ func GenKeyPair(keyPath string) error {
|
|||
}
|
||||
|
||||
// generate public key
|
||||
pub, err := ssh.NewPublicKey(&privateKey.PublicKey)
|
||||
pub, err := gossh.NewPublicKey(&privateKey.PublicKey)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
public := ssh.MarshalAuthorizedKey(pub)
|
||||
public := gossh.MarshalAuthorizedKey(pub)
|
||||
p, err := os.OpenFile(keyPath+".pub", os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
|
||||
if err != nil {
|
||||
return err
|
||||
|
|
|
|||
|
|
@ -0,0 +1 @@
|
|||
shlex.test
|
||||
|
|
@ -0,0 +1,20 @@
|
|||
Copyright (c) anmitsu <anmitsu.s@gmail.com>
|
||||
|
||||
Permission is hereby granted, free of charge, to any person obtaining
|
||||
a copy of this software and associated documentation files (the
|
||||
"Software"), to deal in the Software without restriction, including
|
||||
without limitation the rights to use, copy, modify, merge, publish,
|
||||
distribute, sublicense, and/or sell copies of the Software, and to
|
||||
permit persons to whom the Software is furnished to do so, subject to
|
||||
the following conditions:
|
||||
|
||||
The above copyright notice and this permission notice shall be
|
||||
included in all copies or substantial portions of the Software.
|
||||
|
||||
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
||||
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
||||
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
||||
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
||||
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
||||
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
||||
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
||||
|
|
@ -0,0 +1,38 @@
|
|||
# go-shlex
|
||||
|
||||
go-shlex is a library to make a lexical analyzer like Unix shell for
|
||||
Go.
|
||||
|
||||
## Install
|
||||
|
||||
go get -u "github.com/anmitsu/go-shlex"
|
||||
|
||||
## Usage
|
||||
|
||||
```go
|
||||
package main
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"log"
|
||||
|
||||
"github.com/anmitsu/go-shlex"
|
||||
)
|
||||
|
||||
func main() {
|
||||
cmd := `cp -Rdp "file name" 'file name2' dir\ name`
|
||||
words, err := shlex.Split(cmd, true)
|
||||
if err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
|
||||
for _, w := range words {
|
||||
fmt.Println(w)
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
## Documentation
|
||||
|
||||
http://godoc.org/github.com/anmitsu/go-shlex
|
||||
|
||||
|
|
@ -0,0 +1,193 @@
|
|||
// Package shlex provides a simple lexical analysis like Unix shell.
|
||||
package shlex
|
||||
|
||||
import (
|
||||
"bufio"
|
||||
"errors"
|
||||
"io"
|
||||
"strings"
|
||||
"unicode"
|
||||
)
|
||||
|
||||
var (
|
||||
ErrNoClosing = errors.New("No closing quotation")
|
||||
ErrNoEscaped = errors.New("No escaped character")
|
||||
)
|
||||
|
||||
// Tokenizer is the interface that classifies a token according to
|
||||
// words, whitespaces, quotations, escapes and escaped quotations.
|
||||
type Tokenizer interface {
|
||||
IsWord(rune) bool
|
||||
IsWhitespace(rune) bool
|
||||
IsQuote(rune) bool
|
||||
IsEscape(rune) bool
|
||||
IsEscapedQuote(rune) bool
|
||||
}
|
||||
|
||||
// DefaultTokenizer implements a simple tokenizer like Unix shell.
|
||||
type DefaultTokenizer struct{}
|
||||
|
||||
func (t *DefaultTokenizer) IsWord(r rune) bool {
|
||||
return r == '_' || unicode.IsLetter(r) || unicode.IsNumber(r)
|
||||
}
|
||||
func (t *DefaultTokenizer) IsQuote(r rune) bool {
|
||||
switch r {
|
||||
case '\'', '"':
|
||||
return true
|
||||
default:
|
||||
return false
|
||||
}
|
||||
}
|
||||
func (t *DefaultTokenizer) IsWhitespace(r rune) bool {
|
||||
return unicode.IsSpace(r)
|
||||
}
|
||||
func (t *DefaultTokenizer) IsEscape(r rune) bool {
|
||||
return r == '\\'
|
||||
}
|
||||
func (t *DefaultTokenizer) IsEscapedQuote(r rune) bool {
|
||||
return r == '"'
|
||||
}
|
||||
|
||||
// Lexer represents a lexical analyzer.
|
||||
type Lexer struct {
|
||||
reader *bufio.Reader
|
||||
tokenizer Tokenizer
|
||||
posix bool
|
||||
whitespacesplit bool
|
||||
}
|
||||
|
||||
// NewLexer creates a new Lexer reading from io.Reader. This Lexer
|
||||
// has a DefaultTokenizer according to posix and whitespacesplit
|
||||
// rules.
|
||||
func NewLexer(r io.Reader, posix, whitespacesplit bool) *Lexer {
|
||||
return &Lexer{
|
||||
reader: bufio.NewReader(r),
|
||||
tokenizer: &DefaultTokenizer{},
|
||||
posix: posix,
|
||||
whitespacesplit: whitespacesplit,
|
||||
}
|
||||
}
|
||||
|
||||
// NewLexerString creates a new Lexer reading from a string. This
|
||||
// Lexer has a DefaultTokenizer according to posix and whitespacesplit
|
||||
// rules.
|
||||
func NewLexerString(s string, posix, whitespacesplit bool) *Lexer {
|
||||
return NewLexer(strings.NewReader(s), posix, whitespacesplit)
|
||||
}
|
||||
|
||||
// Split splits a string according to posix or non-posix rules.
|
||||
func Split(s string, posix bool) ([]string, error) {
|
||||
return NewLexerString(s, posix, true).Split()
|
||||
}
|
||||
|
||||
// SetTokenizer sets a Tokenizer.
|
||||
func (l *Lexer) SetTokenizer(t Tokenizer) {
|
||||
l.tokenizer = t
|
||||
}
|
||||
|
||||
func (l *Lexer) Split() ([]string, error) {
|
||||
result := make([]string, 0)
|
||||
for {
|
||||
token, err := l.readToken()
|
||||
if token != "" {
|
||||
result = append(result, token)
|
||||
}
|
||||
|
||||
if err == io.EOF {
|
||||
break
|
||||
} else if err != nil {
|
||||
return result, err
|
||||
}
|
||||
}
|
||||
return result, nil
|
||||
}
|
||||
|
||||
func (l *Lexer) readToken() (string, error) {
|
||||
t := l.tokenizer
|
||||
token := ""
|
||||
quoted := false
|
||||
state := ' '
|
||||
escapedstate := ' '
|
||||
scanning:
|
||||
for {
|
||||
next, _, err := l.reader.ReadRune()
|
||||
if err != nil {
|
||||
if t.IsQuote(state) {
|
||||
return token, ErrNoClosing
|
||||
} else if t.IsEscape(state) {
|
||||
return token, ErrNoEscaped
|
||||
}
|
||||
return token, err
|
||||
}
|
||||
|
||||
switch {
|
||||
case t.IsWhitespace(state):
|
||||
switch {
|
||||
case t.IsWhitespace(next):
|
||||
break scanning
|
||||
case l.posix && t.IsEscape(next):
|
||||
escapedstate = 'a'
|
||||
state = next
|
||||
case t.IsWord(next):
|
||||
token += string(next)
|
||||
state = 'a'
|
||||
case t.IsQuote(next):
|
||||
if !l.posix {
|
||||
token += string(next)
|
||||
}
|
||||
state = next
|
||||
default:
|
||||
token = string(next)
|
||||
if l.whitespacesplit {
|
||||
state = 'a'
|
||||
} else if token != "" || (l.posix && quoted) {
|
||||
break scanning
|
||||
}
|
||||
}
|
||||
case t.IsQuote(state):
|
||||
quoted = true
|
||||
switch {
|
||||
case next == state:
|
||||
if !l.posix {
|
||||
token += string(next)
|
||||
break scanning
|
||||
} else {
|
||||
state = 'a'
|
||||
}
|
||||
case l.posix && t.IsEscape(next) && t.IsEscapedQuote(state):
|
||||
escapedstate = state
|
||||
state = next
|
||||
default:
|
||||
token += string(next)
|
||||
}
|
||||
case t.IsEscape(state):
|
||||
if t.IsQuote(escapedstate) && next != state && next != escapedstate {
|
||||
token += string(state)
|
||||
}
|
||||
token += string(next)
|
||||
state = escapedstate
|
||||
case t.IsWord(state):
|
||||
switch {
|
||||
case t.IsWhitespace(next):
|
||||
if token != "" || (l.posix && quoted) {
|
||||
break scanning
|
||||
}
|
||||
case l.posix && t.IsQuote(next):
|
||||
state = next
|
||||
case l.posix && t.IsEscape(next):
|
||||
escapedstate = 'a'
|
||||
state = next
|
||||
case t.IsWord(next) || t.IsQuote(next):
|
||||
token += string(next)
|
||||
default:
|
||||
if l.whitespacesplit {
|
||||
token += string(next)
|
||||
} else if token != "" {
|
||||
l.reader.UnreadRune()
|
||||
break scanning
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
return token, nil
|
||||
}
|
||||
|
|
@ -0,0 +1,27 @@
|
|||
Copyright (c) 2016 Glider Labs. All rights reserved.
|
||||
|
||||
Redistribution and use in source and binary forms, with or without
|
||||
modification, are permitted provided that the following conditions are
|
||||
met:
|
||||
|
||||
* Redistributions of source code must retain the above copyright
|
||||
notice, this list of conditions and the following disclaimer.
|
||||
* Redistributions in binary form must reproduce the above
|
||||
copyright notice, this list of conditions and the following disclaimer
|
||||
in the documentation and/or other materials provided with the
|
||||
distribution.
|
||||
* Neither the name of Glider Labs nor the names of its
|
||||
contributors may be used to endorse or promote products derived from
|
||||
this software without specific prior written permission.
|
||||
|
||||
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
||||
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
||||
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||||
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
||||
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
||||
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
||||
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||||
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
||||
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
|
|
@ -0,0 +1,96 @@
|
|||
# gliderlabs/ssh
|
||||
|
||||
[](https://godoc.org/github.com/gliderlabs/ssh)
|
||||
[](https://circleci.com/gh/gliderlabs/ssh)
|
||||
[](https://goreportcard.com/report/github.com/gliderlabs/ssh)
|
||||
[](#sponsors)
|
||||
[](http://slack.gliderlabs.com)
|
||||
[](https://app.convertkit.com/landing_pages/243312)
|
||||
|
||||
> The Glider Labs SSH server package is dope. —[@bradfitz](https://twitter.com/bradfitz), Go team member
|
||||
|
||||
This Go package wraps the [crypto/ssh
|
||||
package](https://godoc.org/golang.org/x/crypto/ssh) with a higher-level API for
|
||||
building SSH servers. The goal of the API was to make it as simple as using
|
||||
[net/http](https://golang.org/pkg/net/http/), so the API is very similar:
|
||||
|
||||
```go
|
||||
package main
|
||||
|
||||
import (
|
||||
"github.com/gliderlabs/ssh"
|
||||
"io"
|
||||
"log"
|
||||
)
|
||||
|
||||
func main() {
|
||||
ssh.Handle(func(s ssh.Session) {
|
||||
io.WriteString(s, "Hello world\n")
|
||||
})
|
||||
|
||||
log.Fatal(ssh.ListenAndServe(":2222", nil))
|
||||
}
|
||||
|
||||
```
|
||||
This package was built by [@progrium](https://twitter.com/progrium) after working on nearly a dozen projects at Glider Labs using SSH and collaborating with [@shazow](https://twitter.com/shazow) (known for [ssh-chat](https://github.com/shazow/ssh-chat)).
|
||||
|
||||
## Examples
|
||||
|
||||
A bunch of great examples are in the `_examples` directory.
|
||||
|
||||
## Usage
|
||||
|
||||
[See GoDoc reference.](https://godoc.org/github.com/gliderlabs/ssh)
|
||||
|
||||
## Contributing
|
||||
|
||||
Pull requests are welcome! However, since this project is very much about API
|
||||
design, please submit API changes as issues to discuss before submitting PRs.
|
||||
|
||||
Also, you can [join our Slack](http://slack.gliderlabs.com) to discuss as well.
|
||||
|
||||
## Roadmap
|
||||
|
||||
* Non-session channel handlers
|
||||
* Cleanup callback API
|
||||
* 1.0 release
|
||||
* High-level client?
|
||||
|
||||
## Sponsors
|
||||
|
||||
Become a sponsor and get your logo on our README on Github with a link to your site. [[Become a sponsor](https://opencollective.com/ssh#sponsor)]
|
||||
|
||||
<a href="https://opencollective.com/ssh/sponsor/0/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/0/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/1/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/1/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/2/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/2/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/3/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/3/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/4/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/4/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/5/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/5/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/6/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/6/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/7/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/7/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/8/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/8/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/9/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/9/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/10/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/10/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/11/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/11/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/12/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/12/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/13/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/13/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/14/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/14/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/15/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/15/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/16/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/16/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/17/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/17/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/18/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/18/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/19/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/19/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/20/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/20/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/21/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/21/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/22/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/22/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/23/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/23/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/24/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/24/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/25/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/25/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/26/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/26/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/27/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/27/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/28/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/28/avatar.svg"></a>
|
||||
<a href="https://opencollective.com/ssh/sponsor/29/website" target="_blank"><img src="https://opencollective.com/ssh/sponsor/29/avatar.svg"></a>
|
||||
|
||||
## License
|
||||
|
||||
BSD
|
||||
|
|
@ -0,0 +1,83 @@
|
|||
package ssh
|
||||
|
||||
import (
|
||||
"io"
|
||||
"io/ioutil"
|
||||
"net"
|
||||
"path"
|
||||
"sync"
|
||||
|
||||
gossh "golang.org/x/crypto/ssh"
|
||||
)
|
||||
|
||||
const (
|
||||
agentRequestType = "auth-agent-req@openssh.com"
|
||||
agentChannelType = "auth-agent@openssh.com"
|
||||
|
||||
agentTempDir = "auth-agent"
|
||||
agentListenFile = "listener.sock"
|
||||
)
|
||||
|
||||
// contextKeyAgentRequest is an internal context key for storing if the
|
||||
// client requested agent forwarding
|
||||
var contextKeyAgentRequest = &contextKey{"auth-agent-req"}
|
||||
|
||||
// SetAgentRequested sets up the session context so that AgentRequested
|
||||
// returns true.
|
||||
func SetAgentRequested(ctx Context) {
|
||||
ctx.SetValue(contextKeyAgentRequest, true)
|
||||
}
|
||||
|
||||
// AgentRequested returns true if the client requested agent forwarding.
|
||||
func AgentRequested(sess Session) bool {
|
||||
return sess.Context().Value(contextKeyAgentRequest) == true
|
||||
}
|
||||
|
||||
// NewAgentListener sets up a temporary Unix socket that can be communicated
|
||||
// to the session environment and used for forwarding connections.
|
||||
func NewAgentListener() (net.Listener, error) {
|
||||
dir, err := ioutil.TempDir("", agentTempDir)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
l, err := net.Listen("unix", path.Join(dir, agentListenFile))
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return l, nil
|
||||
}
|
||||
|
||||
// ForwardAgentConnections takes connections from a listener to proxy into the
|
||||
// session on the OpenSSH channel for agent connections. It blocks and services
|
||||
// connections until the listener stop accepting.
|
||||
func ForwardAgentConnections(l net.Listener, s Session) {
|
||||
sshConn := s.Context().Value(ContextKeyConn).(gossh.Conn)
|
||||
for {
|
||||
conn, err := l.Accept()
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
go func(conn net.Conn) {
|
||||
defer conn.Close()
|
||||
channel, reqs, err := sshConn.OpenChannel(agentChannelType, nil)
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
defer channel.Close()
|
||||
go gossh.DiscardRequests(reqs)
|
||||
var wg sync.WaitGroup
|
||||
wg.Add(2)
|
||||
go func() {
|
||||
io.Copy(conn, channel)
|
||||
conn.(*net.UnixConn).CloseWrite()
|
||||
wg.Done()
|
||||
}()
|
||||
go func() {
|
||||
io.Copy(channel, conn)
|
||||
channel.CloseWrite()
|
||||
wg.Done()
|
||||
}()
|
||||
wg.Wait()
|
||||
}(conn)
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,26 @@
|
|||
version: 2
|
||||
jobs:
|
||||
build-go-latest:
|
||||
docker:
|
||||
- image: golang:latest
|
||||
working_directory: /go/src/github.com/gliderlabs/ssh
|
||||
steps:
|
||||
- checkout
|
||||
- run: go get
|
||||
- run: go test -v -race
|
||||
|
||||
build-go-1.9:
|
||||
docker:
|
||||
- image: golang:1.9
|
||||
working_directory: /go/src/github.com/gliderlabs/ssh
|
||||
steps:
|
||||
- checkout
|
||||
- run: go get
|
||||
- run: go test -v -race
|
||||
|
||||
workflows:
|
||||
version: 2
|
||||
build:
|
||||
jobs:
|
||||
- build-go-latest
|
||||
- build-go-1.9
|
||||
|
|
@ -0,0 +1,55 @@
|
|||
package ssh
|
||||
|
||||
import (
|
||||
"context"
|
||||
"net"
|
||||
"time"
|
||||
)
|
||||
|
||||
type serverConn struct {
|
||||
net.Conn
|
||||
|
||||
idleTimeout time.Duration
|
||||
maxDeadline time.Time
|
||||
closeCanceler context.CancelFunc
|
||||
}
|
||||
|
||||
func (c *serverConn) Write(p []byte) (n int, err error) {
|
||||
c.updateDeadline()
|
||||
n, err = c.Conn.Write(p)
|
||||
if _, isNetErr := err.(net.Error); isNetErr && c.closeCanceler != nil {
|
||||
c.closeCanceler()
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func (c *serverConn) Read(b []byte) (n int, err error) {
|
||||
c.updateDeadline()
|
||||
n, err = c.Conn.Read(b)
|
||||
if _, isNetErr := err.(net.Error); isNetErr && c.closeCanceler != nil {
|
||||
c.closeCanceler()
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func (c *serverConn) Close() (err error) {
|
||||
err = c.Conn.Close()
|
||||
if c.closeCanceler != nil {
|
||||
c.closeCanceler()
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func (c *serverConn) updateDeadline() {
|
||||
switch {
|
||||
case c.idleTimeout > 0:
|
||||
idleDeadline := time.Now().Add(c.idleTimeout)
|
||||
if idleDeadline.Unix() < c.maxDeadline.Unix() || c.maxDeadline.IsZero() {
|
||||
c.Conn.SetDeadline(idleDeadline)
|
||||
return
|
||||
}
|
||||
fallthrough
|
||||
default:
|
||||
c.Conn.SetDeadline(c.maxDeadline)
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,152 @@
|
|||
package ssh
|
||||
|
||||
import (
|
||||
"context"
|
||||
"encoding/hex"
|
||||
"net"
|
||||
"sync"
|
||||
|
||||
gossh "golang.org/x/crypto/ssh"
|
||||
)
|
||||
|
||||
// contextKey is a value for use with context.WithValue. It's used as
|
||||
// a pointer so it fits in an interface{} without allocation.
|
||||
type contextKey struct {
|
||||
name string
|
||||
}
|
||||
|
||||
var (
|
||||
// ContextKeyUser is a context key for use with Contexts in this package.
|
||||
// The associated value will be of type string.
|
||||
ContextKeyUser = &contextKey{"user"}
|
||||
|
||||
// ContextKeySessionID is a context key for use with Contexts in this package.
|
||||
// The associated value will be of type string.
|
||||
ContextKeySessionID = &contextKey{"session-id"}
|
||||
|
||||
// ContextKeyPermissions is a context key for use with Contexts in this package.
|
||||
// The associated value will be of type *Permissions.
|
||||
ContextKeyPermissions = &contextKey{"permissions"}
|
||||
|
||||
// ContextKeyClientVersion is a context key for use with Contexts in this package.
|
||||
// The associated value will be of type string.
|
||||
ContextKeyClientVersion = &contextKey{"client-version"}
|
||||
|
||||
// ContextKeyServerVersion is a context key for use with Contexts in this package.
|
||||
// The associated value will be of type string.
|
||||
ContextKeyServerVersion = &contextKey{"server-version"}
|
||||
|
||||
// ContextKeyLocalAddr is a context key for use with Contexts in this package.
|
||||
// The associated value will be of type net.Addr.
|
||||
ContextKeyLocalAddr = &contextKey{"local-addr"}
|
||||
|
||||
// ContextKeyRemoteAddr is a context key for use with Contexts in this package.
|
||||
// The associated value will be of type net.Addr.
|
||||
ContextKeyRemoteAddr = &contextKey{"remote-addr"}
|
||||
|
||||
// ContextKeyServer is a context key for use with Contexts in this package.
|
||||
// The associated value will be of type *Server.
|
||||
ContextKeyServer = &contextKey{"ssh-server"}
|
||||
|
||||
// ContextKeyConn is a context key for use with Contexts in this package.
|
||||
// The associated value will be of type gossh.ServerConn.
|
||||
ContextKeyConn = &contextKey{"ssh-conn"}
|
||||
|
||||
// ContextKeyPublicKey is a context key for use with Contexts in this package.
|
||||
// The associated value will be of type PublicKey.
|
||||
ContextKeyPublicKey = &contextKey{"public-key"}
|
||||
)
|
||||
|
||||
// Context is a package specific context interface. It exposes connection
|
||||
// metadata and allows new values to be easily written to it. It's used in
|
||||
// authentication handlers and callbacks, and its underlying context.Context is
|
||||
// exposed on Session in the session Handler. A connection-scoped lock is also
|
||||
// embedded in the context to make it easier to limit operations per-connection.
|
||||
type Context interface {
|
||||
context.Context
|
||||
sync.Locker
|
||||
|
||||
// User returns the username used when establishing the SSH connection.
|
||||
User() string
|
||||
|
||||
// SessionID returns the session hash.
|
||||
SessionID() string
|
||||
|
||||
// ClientVersion returns the version reported by the client.
|
||||
ClientVersion() string
|
||||
|
||||
// ServerVersion returns the version reported by the server.
|
||||
ServerVersion() string
|
||||
|
||||
// RemoteAddr returns the remote address for this connection.
|
||||
RemoteAddr() net.Addr
|
||||
|
||||
// LocalAddr returns the local address for this connection.
|
||||
LocalAddr() net.Addr
|
||||
|
||||
// Permissions returns the Permissions object used for this connection.
|
||||
Permissions() *Permissions
|
||||
|
||||
// SetValue allows you to easily write new values into the underlying context.
|
||||
SetValue(key, value interface{})
|
||||
}
|
||||
|
||||
type sshContext struct {
|
||||
context.Context
|
||||
*sync.Mutex
|
||||
}
|
||||
|
||||
func newContext(srv *Server) (*sshContext, context.CancelFunc) {
|
||||
innerCtx, cancel := context.WithCancel(context.Background())
|
||||
ctx := &sshContext{innerCtx, &sync.Mutex{}}
|
||||
ctx.SetValue(ContextKeyServer, srv)
|
||||
perms := &Permissions{&gossh.Permissions{}}
|
||||
ctx.SetValue(ContextKeyPermissions, perms)
|
||||
return ctx, cancel
|
||||
}
|
||||
|
||||
// this is separate from newContext because we will get ConnMetadata
|
||||
// at different points so it needs to be applied separately
|
||||
func applyConnMetadata(ctx Context, conn gossh.ConnMetadata) {
|
||||
if ctx.Value(ContextKeySessionID) != nil {
|
||||
return
|
||||
}
|
||||
ctx.SetValue(ContextKeySessionID, hex.EncodeToString(conn.SessionID()))
|
||||
ctx.SetValue(ContextKeyClientVersion, string(conn.ClientVersion()))
|
||||
ctx.SetValue(ContextKeyServerVersion, string(conn.ServerVersion()))
|
||||
ctx.SetValue(ContextKeyUser, conn.User())
|
||||
ctx.SetValue(ContextKeyLocalAddr, conn.LocalAddr())
|
||||
ctx.SetValue(ContextKeyRemoteAddr, conn.RemoteAddr())
|
||||
}
|
||||
|
||||
func (ctx *sshContext) SetValue(key, value interface{}) {
|
||||
ctx.Context = context.WithValue(ctx.Context, key, value)
|
||||
}
|
||||
|
||||
func (ctx *sshContext) User() string {
|
||||
return ctx.Value(ContextKeyUser).(string)
|
||||
}
|
||||
|
||||
func (ctx *sshContext) SessionID() string {
|
||||
return ctx.Value(ContextKeySessionID).(string)
|
||||
}
|
||||
|
||||
func (ctx *sshContext) ClientVersion() string {
|
||||
return ctx.Value(ContextKeyClientVersion).(string)
|
||||
}
|
||||
|
||||
func (ctx *sshContext) ServerVersion() string {
|
||||
return ctx.Value(ContextKeyServerVersion).(string)
|
||||
}
|
||||
|
||||
func (ctx *sshContext) RemoteAddr() net.Addr {
|
||||
return ctx.Value(ContextKeyRemoteAddr).(net.Addr)
|
||||
}
|
||||
|
||||
func (ctx *sshContext) LocalAddr() net.Addr {
|
||||
return ctx.Value(ContextKeyLocalAddr).(net.Addr)
|
||||
}
|
||||
|
||||
func (ctx *sshContext) Permissions() *Permissions {
|
||||
return ctx.Value(ContextKeyPermissions).(*Permissions)
|
||||
}
|
||||
|
|
@ -0,0 +1,45 @@
|
|||
/*
|
||||
Package ssh wraps the crypto/ssh package with a higher-level API for building
|
||||
SSH servers. The goal of the API was to make it as simple as using net/http, so
|
||||
the API is very similar.
|
||||
|
||||
You should be able to build any SSH server using only this package, which wraps
|
||||
relevant types and some functions from crypto/ssh. However, you still need to
|
||||
use crypto/ssh for building SSH clients.
|
||||
|
||||
ListenAndServe starts an SSH server with a given address, handler, and options. The
|
||||
handler is usually nil, which means to use DefaultHandler. Handle sets DefaultHandler:
|
||||
|
||||
ssh.Handle(func(s ssh.Session) {
|
||||
io.WriteString(s, "Hello world\n")
|
||||
})
|
||||
|
||||
log.Fatal(ssh.ListenAndServe(":2222", nil))
|
||||
|
||||
If you don't specify a host key, it will generate one every time. This is convenient
|
||||
except you'll have to deal with clients being confused that the host key is different.
|
||||
It's a better idea to generate or point to an existing key on your system:
|
||||
|
||||
log.Fatal(ssh.ListenAndServe(":2222", nil, ssh.HostKeyFile("/Users/progrium/.ssh/id_rsa")))
|
||||
|
||||
Although all options have functional option helpers, another way to control the
|
||||
server's behavior is by creating a custom Server:
|
||||
|
||||
s := &ssh.Server{
|
||||
Addr: ":2222",
|
||||
Handler: sessionHandler,
|
||||
PublicKeyHandler: authHandler,
|
||||
}
|
||||
s.AddHostKey(hostKeySigner)
|
||||
|
||||
log.Fatal(s.ListenAndServe())
|
||||
|
||||
This package automatically handles basic SSH requests like setting environment
|
||||
variables, requesting PTY, and changing window size. These requests are
|
||||
processed, responded to, and any relevant state is updated. This state is then
|
||||
exposed to you via the Session interface.
|
||||
|
||||
The one big feature missing from the Session abstraction is signals. This was
|
||||
started, but not completed. Pull Requests welcome!
|
||||
*/
|
||||
package ssh
|
||||
|
|
@ -0,0 +1,77 @@
|
|||
package ssh
|
||||
|
||||
import (
|
||||
"io/ioutil"
|
||||
|
||||
gossh "golang.org/x/crypto/ssh"
|
||||
)
|
||||
|
||||
// PasswordAuth returns a functional option that sets PasswordHandler on the server.
|
||||
func PasswordAuth(fn PasswordHandler) Option {
|
||||
return func(srv *Server) error {
|
||||
srv.PasswordHandler = fn
|
||||
return nil
|
||||
}
|
||||
}
|
||||
|
||||
// PublicKeyAuth returns a functional option that sets PublicKeyHandler on the server.
|
||||
func PublicKeyAuth(fn PublicKeyHandler) Option {
|
||||
return func(srv *Server) error {
|
||||
srv.PublicKeyHandler = fn
|
||||
return nil
|
||||
}
|
||||
}
|
||||
|
||||
// HostKeyFile returns a functional option that adds HostSigners to the server
|
||||
// from a PEM file at filepath.
|
||||
func HostKeyFile(filepath string) Option {
|
||||
return func(srv *Server) error {
|
||||
pemBytes, err := ioutil.ReadFile(filepath)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
signer, err := gossh.ParsePrivateKey(pemBytes)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
srv.AddHostKey(signer)
|
||||
|
||||
return nil
|
||||
}
|
||||
}
|
||||
|
||||
// HostKeyPEM returns a functional option that adds HostSigners to the server
|
||||
// from a PEM file as bytes.
|
||||
func HostKeyPEM(bytes []byte) Option {
|
||||
return func(srv *Server) error {
|
||||
signer, err := gossh.ParsePrivateKey(bytes)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
srv.AddHostKey(signer)
|
||||
|
||||
return nil
|
||||
}
|
||||
}
|
||||
|
||||
// NoPty returns a functional option that sets PtyCallback to return false,
|
||||
// denying PTY requests.
|
||||
func NoPty() Option {
|
||||
return func(srv *Server) error {
|
||||
srv.PtyCallback = func(ctx Context, pty Pty) bool {
|
||||
return false
|
||||
}
|
||||
return nil
|
||||
}
|
||||
}
|
||||
|
||||
// WrapConn returns a functional option that sets ConnCallback on the server.
|
||||
func WrapConn(fn ConnCallback) Option {
|
||||
return func(srv *Server) error {
|
||||
srv.ConnCallback = fn
|
||||
return nil
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,394 @@
|
|||
package ssh
|
||||
|
||||
import (
|
||||
"context"
|
||||
"errors"
|
||||
"fmt"
|
||||
"net"
|
||||
"sync"
|
||||
"time"
|
||||
|
||||
gossh "golang.org/x/crypto/ssh"
|
||||
)
|
||||
|
||||
// ErrServerClosed is returned by the Server's Serve, ListenAndServe,
|
||||
// and ListenAndServeTLS methods after a call to Shutdown or Close.
|
||||
var ErrServerClosed = errors.New("ssh: Server closed")
|
||||
|
||||
type RequestHandler func(ctx Context, srv *Server, req *gossh.Request) (ok bool, payload []byte)
|
||||
|
||||
var DefaultRequestHandlers = map[string]RequestHandler{}
|
||||
|
||||
type ChannelHandler func(srv *Server, conn *gossh.ServerConn, newChan gossh.NewChannel, ctx Context)
|
||||
|
||||
var DefaultChannelHandlers = map[string]ChannelHandler{
|
||||
"session": DefaultSessionHandler,
|
||||
}
|
||||
|
||||
// Server defines parameters for running an SSH server. The zero value for
|
||||
// Server is a valid configuration. When both PasswordHandler and
|
||||
// PublicKeyHandler are nil, no client authentication is performed.
|
||||
type Server struct {
|
||||
Addr string // TCP address to listen on, ":22" if empty
|
||||
Handler Handler // handler to invoke, ssh.DefaultHandler if nil
|
||||
HostSigners []Signer // private keys for the host key, must have at least one
|
||||
Version string // server version to be sent before the initial handshake
|
||||
|
||||
KeyboardInteractiveHandler KeyboardInteractiveHandler // keyboard-interactive authentication handler
|
||||
PasswordHandler PasswordHandler // password authentication handler
|
||||
PublicKeyHandler PublicKeyHandler // public key authentication handler
|
||||
PtyCallback PtyCallback // callback for allowing PTY sessions, allows all if nil
|
||||
ConnCallback ConnCallback // optional callback for wrapping net.Conn before handling
|
||||
LocalPortForwardingCallback LocalPortForwardingCallback // callback for allowing local port forwarding, denies all if nil
|
||||
ReversePortForwardingCallback ReversePortForwardingCallback // callback for allowing reverse port forwarding, denies all if nil
|
||||
ServerConfigCallback ServerConfigCallback // callback for configuring detailed SSH options
|
||||
SessionRequestCallback SessionRequestCallback // callback for allowing or denying SSH sessions
|
||||
|
||||
IdleTimeout time.Duration // connection timeout when no activity, none if empty
|
||||
MaxTimeout time.Duration // absolute connection timeout, none if empty
|
||||
|
||||
// ChannelHandlers allow overriding the built-in session handlers or provide
|
||||
// extensions to the protocol, such as tcpip forwarding. By default only the
|
||||
// "session" handler is enabled.
|
||||
ChannelHandlers map[string]ChannelHandler
|
||||
|
||||
// RequestHandlers allow overriding the server-level request handlers or
|
||||
// provide extensions to the protocol, such as tcpip forwarding. By default
|
||||
// no handlers are enabled.
|
||||
RequestHandlers map[string]RequestHandler
|
||||
|
||||
listenerWg sync.WaitGroup
|
||||
mu sync.Mutex
|
||||
listeners map[net.Listener]struct{}
|
||||
conns map[*gossh.ServerConn]struct{}
|
||||
connWg sync.WaitGroup
|
||||
doneChan chan struct{}
|
||||
}
|
||||
|
||||
func (srv *Server) ensureHostSigner() error {
|
||||
if len(srv.HostSigners) == 0 {
|
||||
signer, err := generateSigner()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
srv.HostSigners = append(srv.HostSigners, signer)
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func (srv *Server) ensureHandlers() {
|
||||
srv.mu.Lock()
|
||||
defer srv.mu.Unlock()
|
||||
if srv.RequestHandlers == nil {
|
||||
srv.RequestHandlers = map[string]RequestHandler{}
|
||||
for k, v := range DefaultRequestHandlers {
|
||||
srv.RequestHandlers[k] = v
|
||||
}
|
||||
}
|
||||
if srv.ChannelHandlers == nil {
|
||||
srv.ChannelHandlers = map[string]ChannelHandler{}
|
||||
for k, v := range DefaultChannelHandlers {
|
||||
srv.ChannelHandlers[k] = v
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func (srv *Server) config(ctx Context) *gossh.ServerConfig {
|
||||
var config *gossh.ServerConfig
|
||||
if srv.ServerConfigCallback == nil {
|
||||
config = &gossh.ServerConfig{}
|
||||
} else {
|
||||
config = srv.ServerConfigCallback(ctx)
|
||||
}
|
||||
for _, signer := range srv.HostSigners {
|
||||
config.AddHostKey(signer)
|
||||
}
|
||||
if srv.PasswordHandler == nil && srv.PublicKeyHandler == nil {
|
||||
config.NoClientAuth = true
|
||||
}
|
||||
if srv.Version != "" {
|
||||
config.ServerVersion = "SSH-2.0-" + srv.Version
|
||||
}
|
||||
if srv.PasswordHandler != nil {
|
||||
config.PasswordCallback = func(conn gossh.ConnMetadata, password []byte) (*gossh.Permissions, error) {
|
||||
applyConnMetadata(ctx, conn)
|
||||
if ok := srv.PasswordHandler(ctx, string(password)); !ok {
|
||||
return ctx.Permissions().Permissions, fmt.Errorf("permission denied")
|
||||
}
|
||||
return ctx.Permissions().Permissions, nil
|
||||
}
|
||||
}
|
||||
if srv.PublicKeyHandler != nil {
|
||||
config.PublicKeyCallback = func(conn gossh.ConnMetadata, key gossh.PublicKey) (*gossh.Permissions, error) {
|
||||
applyConnMetadata(ctx, conn)
|
||||
if ok := srv.PublicKeyHandler(ctx, key); !ok {
|
||||
return ctx.Permissions().Permissions, fmt.Errorf("permission denied")
|
||||
}
|
||||
ctx.SetValue(ContextKeyPublicKey, key)
|
||||
return ctx.Permissions().Permissions, nil
|
||||
}
|
||||
}
|
||||
if srv.KeyboardInteractiveHandler != nil {
|
||||
config.KeyboardInteractiveCallback = func(conn gossh.ConnMetadata, challenger gossh.KeyboardInteractiveChallenge) (*gossh.Permissions, error) {
|
||||
if ok := srv.KeyboardInteractiveHandler(ctx, challenger); !ok {
|
||||
return ctx.Permissions().Permissions, fmt.Errorf("permission denied")
|
||||
}
|
||||
return ctx.Permissions().Permissions, nil
|
||||
}
|
||||
}
|
||||
return config
|
||||
}
|
||||
|
||||
// Handle sets the Handler for the server.
|
||||
func (srv *Server) Handle(fn Handler) {
|
||||
srv.Handler = fn
|
||||
}
|
||||
|
||||
// Close immediately closes all active listeners and all active
|
||||
// connections.
|
||||
//
|
||||
// Close returns any error returned from closing the Server's
|
||||
// underlying Listener(s).
|
||||
func (srv *Server) Close() error {
|
||||
srv.mu.Lock()
|
||||
defer srv.mu.Unlock()
|
||||
srv.closeDoneChanLocked()
|
||||
err := srv.closeListenersLocked()
|
||||
for c := range srv.conns {
|
||||
c.Close()
|
||||
delete(srv.conns, c)
|
||||
}
|
||||
return err
|
||||
}
|
||||
|
||||
// Shutdown gracefully shuts down the server without interrupting any
|
||||
// active connections. Shutdown works by first closing all open
|
||||
// listeners, and then waiting indefinitely for connections to close.
|
||||
// If the provided context expires before the shutdown is complete,
|
||||
// then the context's error is returned.
|
||||
func (srv *Server) Shutdown(ctx context.Context) error {
|
||||
srv.mu.Lock()
|
||||
lnerr := srv.closeListenersLocked()
|
||||
srv.closeDoneChanLocked()
|
||||
srv.mu.Unlock()
|
||||
|
||||
finished := make(chan struct{}, 1)
|
||||
go func() {
|
||||
srv.listenerWg.Wait()
|
||||
srv.connWg.Wait()
|
||||
finished <- struct{}{}
|
||||
}()
|
||||
|
||||
select {
|
||||
case <-ctx.Done():
|
||||
return ctx.Err()
|
||||
case <-finished:
|
||||
return lnerr
|
||||
}
|
||||
}
|
||||
|
||||
// Serve accepts incoming connections on the Listener l, creating a new
|
||||
// connection goroutine for each. The connection goroutines read requests and then
|
||||
// calls srv.Handler to handle sessions.
|
||||
//
|
||||
// Serve always returns a non-nil error.
|
||||
func (srv *Server) Serve(l net.Listener) error {
|
||||
srv.ensureHandlers()
|
||||
defer l.Close()
|
||||
if err := srv.ensureHostSigner(); err != nil {
|
||||
return err
|
||||
}
|
||||
if srv.Handler == nil {
|
||||
srv.Handler = DefaultHandler
|
||||
}
|
||||
var tempDelay time.Duration
|
||||
|
||||
srv.trackListener(l, true)
|
||||
defer srv.trackListener(l, false)
|
||||
for {
|
||||
conn, e := l.Accept()
|
||||
if e != nil {
|
||||
select {
|
||||
case <-srv.getDoneChan():
|
||||
return ErrServerClosed
|
||||
default:
|
||||
}
|
||||
if ne, ok := e.(net.Error); ok && ne.Temporary() {
|
||||
if tempDelay == 0 {
|
||||
tempDelay = 5 * time.Millisecond
|
||||
} else {
|
||||
tempDelay *= 2
|
||||
}
|
||||
if max := 1 * time.Second; tempDelay > max {
|
||||
tempDelay = max
|
||||
}
|
||||
time.Sleep(tempDelay)
|
||||
continue
|
||||
}
|
||||
return e
|
||||
}
|
||||
go srv.handleConn(conn)
|
||||
}
|
||||
}
|
||||
|
||||
func (srv *Server) handleConn(newConn net.Conn) {
|
||||
if srv.ConnCallback != nil {
|
||||
cbConn := srv.ConnCallback(newConn)
|
||||
if cbConn == nil {
|
||||
newConn.Close()
|
||||
return
|
||||
}
|
||||
newConn = cbConn
|
||||
}
|
||||
ctx, cancel := newContext(srv)
|
||||
conn := &serverConn{
|
||||
Conn: newConn,
|
||||
idleTimeout: srv.IdleTimeout,
|
||||
closeCanceler: cancel,
|
||||
}
|
||||
if srv.MaxTimeout > 0 {
|
||||
conn.maxDeadline = time.Now().Add(srv.MaxTimeout)
|
||||
}
|
||||
defer conn.Close()
|
||||
sshConn, chans, reqs, err := gossh.NewServerConn(conn, srv.config(ctx))
|
||||
if err != nil {
|
||||
// TODO: trigger event callback
|
||||
return
|
||||
}
|
||||
|
||||
srv.trackConn(sshConn, true)
|
||||
defer srv.trackConn(sshConn, false)
|
||||
|
||||
ctx.SetValue(ContextKeyConn, sshConn)
|
||||
applyConnMetadata(ctx, sshConn)
|
||||
//go gossh.DiscardRequests(reqs)
|
||||
go srv.handleRequests(ctx, reqs)
|
||||
for ch := range chans {
|
||||
handler := srv.ChannelHandlers[ch.ChannelType()]
|
||||
if handler == nil {
|
||||
handler = srv.ChannelHandlers["default"]
|
||||
}
|
||||
if handler == nil {
|
||||
ch.Reject(gossh.UnknownChannelType, "unsupported channel type")
|
||||
continue
|
||||
}
|
||||
go handler(srv, sshConn, ch, ctx)
|
||||
}
|
||||
}
|
||||
|
||||
func (srv *Server) handleRequests(ctx Context, in <-chan *gossh.Request) {
|
||||
for req := range in {
|
||||
handler := srv.RequestHandlers[req.Type]
|
||||
if handler == nil {
|
||||
handler = srv.RequestHandlers["default"]
|
||||
}
|
||||
if handler == nil {
|
||||
req.Reply(false, nil)
|
||||
continue
|
||||
}
|
||||
/*reqCtx, cancel := context.WithCancel(ctx)
|
||||
defer cancel() */
|
||||
ret, payload := handler(ctx, srv, req)
|
||||
req.Reply(ret, payload)
|
||||
}
|
||||
}
|
||||
|
||||
// ListenAndServe listens on the TCP network address srv.Addr and then calls
|
||||
// Serve to handle incoming connections. If srv.Addr is blank, ":22" is used.
|
||||
// ListenAndServe always returns a non-nil error.
|
||||
func (srv *Server) ListenAndServe() error {
|
||||
addr := srv.Addr
|
||||
if addr == "" {
|
||||
addr = ":22"
|
||||
}
|
||||
ln, err := net.Listen("tcp", addr)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
return srv.Serve(ln)
|
||||
}
|
||||
|
||||
// AddHostKey adds a private key as a host key. If an existing host key exists
|
||||
// with the same algorithm, it is overwritten. Each server config must have at
|
||||
// least one host key.
|
||||
func (srv *Server) AddHostKey(key Signer) {
|
||||
// these are later added via AddHostKey on ServerConfig, which performs the
|
||||
// check for one of every algorithm.
|
||||
srv.HostSigners = append(srv.HostSigners, key)
|
||||
}
|
||||
|
||||
// SetOption runs a functional option against the server.
|
||||
func (srv *Server) SetOption(option Option) error {
|
||||
return option(srv)
|
||||
}
|
||||
|
||||
func (srv *Server) getDoneChan() <-chan struct{} {
|
||||
srv.mu.Lock()
|
||||
defer srv.mu.Unlock()
|
||||
return srv.getDoneChanLocked()
|
||||
}
|
||||
|
||||
func (srv *Server) getDoneChanLocked() chan struct{} {
|
||||
if srv.doneChan == nil {
|
||||
srv.doneChan = make(chan struct{})
|
||||
}
|
||||
return srv.doneChan
|
||||
}
|
||||
|
||||
func (srv *Server) closeDoneChanLocked() {
|
||||
ch := srv.getDoneChanLocked()
|
||||
select {
|
||||
case <-ch:
|
||||
// Already closed. Don't close again.
|
||||
default:
|
||||
// Safe to close here. We're the only closer, guarded
|
||||
// by srv.mu.
|
||||
close(ch)
|
||||
}
|
||||
}
|
||||
|
||||
func (srv *Server) closeListenersLocked() error {
|
||||
var err error
|
||||
for ln := range srv.listeners {
|
||||
if cerr := ln.Close(); cerr != nil && err == nil {
|
||||
err = cerr
|
||||
}
|
||||
delete(srv.listeners, ln)
|
||||
}
|
||||
return err
|
||||
}
|
||||
|
||||
func (srv *Server) trackListener(ln net.Listener, add bool) {
|
||||
srv.mu.Lock()
|
||||
defer srv.mu.Unlock()
|
||||
if srv.listeners == nil {
|
||||
srv.listeners = make(map[net.Listener]struct{})
|
||||
}
|
||||
if add {
|
||||
// If the *Server is being reused after a previous
|
||||
// Close or Shutdown, reset its doneChan:
|
||||
if len(srv.listeners) == 0 && len(srv.conns) == 0 {
|
||||
srv.doneChan = nil
|
||||
}
|
||||
srv.listeners[ln] = struct{}{}
|
||||
srv.listenerWg.Add(1)
|
||||
} else {
|
||||
delete(srv.listeners, ln)
|
||||
srv.listenerWg.Done()
|
||||
}
|
||||
}
|
||||
|
||||
func (srv *Server) trackConn(c *gossh.ServerConn, add bool) {
|
||||
srv.mu.Lock()
|
||||
defer srv.mu.Unlock()
|
||||
if srv.conns == nil {
|
||||
srv.conns = make(map[*gossh.ServerConn]struct{})
|
||||
}
|
||||
if add {
|
||||
srv.conns[c] = struct{}{}
|
||||
srv.connWg.Add(1)
|
||||
} else {
|
||||
delete(srv.conns, c)
|
||||
srv.connWg.Done()
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,308 @@
|
|||
package ssh
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"context"
|
||||
"errors"
|
||||
"fmt"
|
||||
"net"
|
||||
"sync"
|
||||
|
||||
"github.com/anmitsu/go-shlex"
|
||||
gossh "golang.org/x/crypto/ssh"
|
||||
)
|
||||
|
||||
// Session provides access to information about an SSH session and methods
|
||||
// to read and write to the SSH channel with an embedded Channel interface from
|
||||
// cypto/ssh.
|
||||
//
|
||||
// When Command() returns an empty slice, the user requested a shell. Otherwise
|
||||
// the user is performing an exec with those command arguments.
|
||||
//
|
||||
// TODO: Signals
|
||||
type Session interface {
|
||||
gossh.Channel
|
||||
|
||||
// User returns the username used when establishing the SSH connection.
|
||||
User() string
|
||||
|
||||
// RemoteAddr returns the net.Addr of the client side of the connection.
|
||||
RemoteAddr() net.Addr
|
||||
|
||||
// LocalAddr returns the net.Addr of the server side of the connection.
|
||||
LocalAddr() net.Addr
|
||||
|
||||
// Environ returns a copy of strings representing the environment set by the
|
||||
// user for this session, in the form "key=value".
|
||||
Environ() []string
|
||||
|
||||
// Exit sends an exit status and then closes the session.
|
||||
Exit(code int) error
|
||||
|
||||
// Command returns a shell parsed slice of arguments that were provided by the
|
||||
// user. Shell parsing splits the command string according to POSIX shell rules,
|
||||
// which considers quoting not just whitespace.
|
||||
Command() []string
|
||||
|
||||
// RawCommand returns the exact command that was provided by the user.
|
||||
RawCommand() string
|
||||
|
||||
// PublicKey returns the PublicKey used to authenticate. If a public key was not
|
||||
// used it will return nil.
|
||||
PublicKey() PublicKey
|
||||
|
||||
// Context returns the connection's context. The returned context is always
|
||||
// non-nil and holds the same data as the Context passed into auth
|
||||
// handlers and callbacks.
|
||||
//
|
||||
// The context is canceled when the client's connection closes or I/O
|
||||
// operation fails.
|
||||
Context() context.Context
|
||||
|
||||
// Permissions returns a copy of the Permissions object that was available for
|
||||
// setup in the auth handlers via the Context.
|
||||
Permissions() Permissions
|
||||
|
||||
// Pty returns PTY information, a channel of window size changes, and a boolean
|
||||
// of whether or not a PTY was accepted for this session.
|
||||
Pty() (Pty, <-chan Window, bool)
|
||||
|
||||
// Signals registers a channel to receive signals sent from the client. The
|
||||
// channel must handle signal sends or it will block the SSH request loop.
|
||||
// Registering nil will unregister the channel from signal sends. During the
|
||||
// time no channel is registered signals are buffered up to a reasonable amount.
|
||||
// If there are buffered signals when a channel is registered, they will be
|
||||
// sent in order on the channel immediately after registering.
|
||||
Signals(c chan<- Signal)
|
||||
}
|
||||
|
||||
// maxSigBufSize is how many signals will be buffered
|
||||
// when there is no signal channel specified
|
||||
const maxSigBufSize = 128
|
||||
|
||||
func DefaultSessionHandler(srv *Server, conn *gossh.ServerConn, newChan gossh.NewChannel, ctx Context) {
|
||||
ch, reqs, err := newChan.Accept()
|
||||
if err != nil {
|
||||
// TODO: trigger event callback
|
||||
return
|
||||
}
|
||||
sess := &session{
|
||||
Channel: ch,
|
||||
conn: conn,
|
||||
handler: srv.Handler,
|
||||
ptyCb: srv.PtyCallback,
|
||||
sessReqCb: srv.SessionRequestCallback,
|
||||
ctx: ctx,
|
||||
}
|
||||
sess.handleRequests(reqs)
|
||||
}
|
||||
|
||||
type session struct {
|
||||
sync.Mutex
|
||||
gossh.Channel
|
||||
conn *gossh.ServerConn
|
||||
handler Handler
|
||||
handled bool
|
||||
exited bool
|
||||
pty *Pty
|
||||
winch chan Window
|
||||
env []string
|
||||
ptyCb PtyCallback
|
||||
sessReqCb SessionRequestCallback
|
||||
rawCmd string
|
||||
ctx Context
|
||||
sigCh chan<- Signal
|
||||
sigBuf []Signal
|
||||
}
|
||||
|
||||
func (sess *session) Write(p []byte) (n int, err error) {
|
||||
if sess.pty != nil {
|
||||
m := len(p)
|
||||
// normalize \n to \r\n when pty is accepted.
|
||||
// this is a hardcoded shortcut since we don't support terminal modes.
|
||||
p = bytes.Replace(p, []byte{'\n'}, []byte{'\r', '\n'}, -1)
|
||||
p = bytes.Replace(p, []byte{'\r', '\r', '\n'}, []byte{'\r', '\n'}, -1)
|
||||
n, err = sess.Channel.Write(p)
|
||||
if n > m {
|
||||
n = m
|
||||
}
|
||||
return
|
||||
}
|
||||
return sess.Channel.Write(p)
|
||||
}
|
||||
|
||||
func (sess *session) PublicKey() PublicKey {
|
||||
sessionkey := sess.ctx.Value(ContextKeyPublicKey)
|
||||
if sessionkey == nil {
|
||||
return nil
|
||||
}
|
||||
return sessionkey.(PublicKey)
|
||||
}
|
||||
|
||||
func (sess *session) Permissions() Permissions {
|
||||
// use context permissions because its properly
|
||||
// wrapped and easier to dereference
|
||||
perms := sess.ctx.Value(ContextKeyPermissions).(*Permissions)
|
||||
return *perms
|
||||
}
|
||||
|
||||
func (sess *session) Context() context.Context {
|
||||
return sess.ctx
|
||||
}
|
||||
|
||||
func (sess *session) Exit(code int) error {
|
||||
sess.Lock()
|
||||
defer sess.Unlock()
|
||||
if sess.exited {
|
||||
return errors.New("Session.Exit called multiple times")
|
||||
}
|
||||
sess.exited = true
|
||||
|
||||
status := struct{ Status uint32 }{uint32(code)}
|
||||
_, err := sess.SendRequest("exit-status", false, gossh.Marshal(&status))
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
return sess.Close()
|
||||
}
|
||||
|
||||
func (sess *session) User() string {
|
||||
return sess.conn.User()
|
||||
}
|
||||
|
||||
func (sess *session) RemoteAddr() net.Addr {
|
||||
return sess.conn.RemoteAddr()
|
||||
}
|
||||
|
||||
func (sess *session) LocalAddr() net.Addr {
|
||||
return sess.conn.LocalAddr()
|
||||
}
|
||||
|
||||
func (sess *session) Environ() []string {
|
||||
return append([]string(nil), sess.env...)
|
||||
}
|
||||
|
||||
func (sess *session) RawCommand() string {
|
||||
return sess.rawCmd
|
||||
}
|
||||
|
||||
func (sess *session) Command() []string {
|
||||
cmd, _ := shlex.Split(sess.rawCmd, true)
|
||||
return append([]string(nil), cmd...)
|
||||
}
|
||||
|
||||
func (sess *session) Pty() (Pty, <-chan Window, bool) {
|
||||
if sess.pty != nil {
|
||||
return *sess.pty, sess.winch, true
|
||||
}
|
||||
return Pty{}, sess.winch, false
|
||||
}
|
||||
|
||||
func (sess *session) Signals(c chan<- Signal) {
|
||||
sess.Lock()
|
||||
defer sess.Unlock()
|
||||
sess.sigCh = c
|
||||
if len(sess.sigBuf) > 0 {
|
||||
go func() {
|
||||
for _, sig := range sess.sigBuf {
|
||||
sess.sigCh <- sig
|
||||
}
|
||||
}()
|
||||
}
|
||||
}
|
||||
|
||||
func (sess *session) handleRequests(reqs <-chan *gossh.Request) {
|
||||
for req := range reqs {
|
||||
switch req.Type {
|
||||
case "shell", "exec":
|
||||
if sess.handled {
|
||||
req.Reply(false, nil)
|
||||
continue
|
||||
}
|
||||
|
||||
var payload = struct{ Value string }{}
|
||||
gossh.Unmarshal(req.Payload, &payload)
|
||||
sess.rawCmd = payload.Value
|
||||
|
||||
// If there's a session policy callback, we need to confirm before
|
||||
// accepting the session.
|
||||
if sess.sessReqCb != nil && !sess.sessReqCb(sess, req.Type) {
|
||||
sess.rawCmd = ""
|
||||
req.Reply(false, nil)
|
||||
continue
|
||||
}
|
||||
|
||||
sess.handled = true
|
||||
req.Reply(true, nil)
|
||||
|
||||
go func() {
|
||||
sess.handler(sess)
|
||||
sess.Exit(0)
|
||||
}()
|
||||
case "env":
|
||||
if sess.handled {
|
||||
req.Reply(false, nil)
|
||||
continue
|
||||
}
|
||||
var kv struct{ Key, Value string }
|
||||
gossh.Unmarshal(req.Payload, &kv)
|
||||
sess.env = append(sess.env, fmt.Sprintf("%s=%s", kv.Key, kv.Value))
|
||||
req.Reply(true, nil)
|
||||
case "signal":
|
||||
var payload struct{ Signal string }
|
||||
gossh.Unmarshal(req.Payload, &payload)
|
||||
sess.Lock()
|
||||
if sess.sigCh != nil {
|
||||
sess.sigCh <- Signal(payload.Signal)
|
||||
} else {
|
||||
if len(sess.sigBuf) < maxSigBufSize {
|
||||
sess.sigBuf = append(sess.sigBuf, Signal(payload.Signal))
|
||||
}
|
||||
}
|
||||
sess.Unlock()
|
||||
case "pty-req":
|
||||
if sess.handled || sess.pty != nil {
|
||||
req.Reply(false, nil)
|
||||
continue
|
||||
}
|
||||
ptyReq, ok := parsePtyRequest(req.Payload)
|
||||
if !ok {
|
||||
req.Reply(false, nil)
|
||||
continue
|
||||
}
|
||||
if sess.ptyCb != nil {
|
||||
ok := sess.ptyCb(sess.ctx, ptyReq)
|
||||
if !ok {
|
||||
req.Reply(false, nil)
|
||||
continue
|
||||
}
|
||||
}
|
||||
sess.pty = &ptyReq
|
||||
sess.winch = make(chan Window, 1)
|
||||
sess.winch <- ptyReq.Window
|
||||
defer func() {
|
||||
// when reqs is closed
|
||||
close(sess.winch)
|
||||
}()
|
||||
req.Reply(ok, nil)
|
||||
case "window-change":
|
||||
if sess.pty == nil {
|
||||
req.Reply(false, nil)
|
||||
continue
|
||||
}
|
||||
win, ok := parseWinchRequest(req.Payload)
|
||||
if ok {
|
||||
sess.pty.Window = win
|
||||
sess.winch <- win
|
||||
}
|
||||
req.Reply(ok, nil)
|
||||
case agentRequestType:
|
||||
// TODO: option/callback to allow agent forwarding
|
||||
SetAgentRequested(sess.ctx)
|
||||
req.Reply(true, nil)
|
||||
default:
|
||||
// TODO: debug log
|
||||
req.Reply(false, nil)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,123 @@
|
|||
package ssh
|
||||
|
||||
import (
|
||||
"crypto/subtle"
|
||||
"net"
|
||||
|
||||
gossh "golang.org/x/crypto/ssh"
|
||||
)
|
||||
|
||||
type Signal string
|
||||
|
||||
// POSIX signals as listed in RFC 4254 Section 6.10.
|
||||
const (
|
||||
SIGABRT Signal = "ABRT"
|
||||
SIGALRM Signal = "ALRM"
|
||||
SIGFPE Signal = "FPE"
|
||||
SIGHUP Signal = "HUP"
|
||||
SIGILL Signal = "ILL"
|
||||
SIGINT Signal = "INT"
|
||||
SIGKILL Signal = "KILL"
|
||||
SIGPIPE Signal = "PIPE"
|
||||
SIGQUIT Signal = "QUIT"
|
||||
SIGSEGV Signal = "SEGV"
|
||||
SIGTERM Signal = "TERM"
|
||||
SIGUSR1 Signal = "USR1"
|
||||
SIGUSR2 Signal = "USR2"
|
||||
)
|
||||
|
||||
// DefaultHandler is the default Handler used by Serve.
|
||||
var DefaultHandler Handler
|
||||
|
||||
// Option is a functional option handler for Server.
|
||||
type Option func(*Server) error
|
||||
|
||||
// Handler is a callback for handling established SSH sessions.
|
||||
type Handler func(Session)
|
||||
|
||||
// PublicKeyHandler is a callback for performing public key authentication.
|
||||
type PublicKeyHandler func(ctx Context, key PublicKey) bool
|
||||
|
||||
// PasswordHandler is a callback for performing password authentication.
|
||||
type PasswordHandler func(ctx Context, password string) bool
|
||||
|
||||
// KeyboardInteractiveHandler is a callback for performing keyboard-interactive authentication.
|
||||
type KeyboardInteractiveHandler func(ctx Context, challenger gossh.KeyboardInteractiveChallenge) bool
|
||||
|
||||
// PtyCallback is a hook for allowing PTY sessions.
|
||||
type PtyCallback func(ctx Context, pty Pty) bool
|
||||
|
||||
// SessionRequestCallback is a callback for allowing or denying SSH sessions.
|
||||
type SessionRequestCallback func(sess Session, requestType string) bool
|
||||
|
||||
// ConnCallback is a hook for new connections before handling.
|
||||
// It allows wrapping for timeouts and limiting by returning
|
||||
// the net.Conn that will be used as the underlying connection.
|
||||
type ConnCallback func(conn net.Conn) net.Conn
|
||||
|
||||
// LocalPortForwardingCallback is a hook for allowing port forwarding
|
||||
type LocalPortForwardingCallback func(ctx Context, destinationHost string, destinationPort uint32) bool
|
||||
|
||||
// ReversePortForwardingCallback is a hook for allowing reverse port forwarding
|
||||
type ReversePortForwardingCallback func(ctx Context, bindHost string, bindPort uint32) bool
|
||||
|
||||
// ServerConfigCallback is a hook for creating custom default server configs
|
||||
type ServerConfigCallback func(ctx Context) *gossh.ServerConfig
|
||||
|
||||
// Window represents the size of a PTY window.
|
||||
type Window struct {
|
||||
Width int
|
||||
Height int
|
||||
}
|
||||
|
||||
// Pty represents a PTY request and configuration.
|
||||
type Pty struct {
|
||||
Term string
|
||||
Window Window
|
||||
// HELP WANTED: terminal modes!
|
||||
}
|
||||
|
||||
// Serve accepts incoming SSH connections on the listener l, creating a new
|
||||
// connection goroutine for each. The connection goroutines read requests and
|
||||
// then calls handler to handle sessions. Handler is typically nil, in which
|
||||
// case the DefaultHandler is used.
|
||||
func Serve(l net.Listener, handler Handler, options ...Option) error {
|
||||
srv := &Server{Handler: handler}
|
||||
for _, option := range options {
|
||||
if err := srv.SetOption(option); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return srv.Serve(l)
|
||||
}
|
||||
|
||||
// ListenAndServe listens on the TCP network address addr and then calls Serve
|
||||
// with handler to handle sessions on incoming connections. Handler is typically
|
||||
// nil, in which case the DefaultHandler is used.
|
||||
func ListenAndServe(addr string, handler Handler, options ...Option) error {
|
||||
srv := &Server{Addr: addr, Handler: handler}
|
||||
for _, option := range options {
|
||||
if err := srv.SetOption(option); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return srv.ListenAndServe()
|
||||
}
|
||||
|
||||
// Handle registers the handler as the DefaultHandler.
|
||||
func Handle(handler Handler) {
|
||||
DefaultHandler = handler
|
||||
}
|
||||
|
||||
// KeysEqual is constant time compare of the keys to avoid timing attacks.
|
||||
func KeysEqual(ak, bk PublicKey) bool {
|
||||
|
||||
//avoid panic if one of the keys is nil, return false instead
|
||||
if ak == nil || bk == nil {
|
||||
return false
|
||||
}
|
||||
|
||||
a := ak.Marshal()
|
||||
b := bk.Marshal()
|
||||
return (len(a) == len(b) && subtle.ConstantTimeCompare(a, b) == 1)
|
||||
}
|
||||
|
|
@ -0,0 +1,193 @@
|
|||
package ssh
|
||||
|
||||
import (
|
||||
"io"
|
||||
"log"
|
||||
"net"
|
||||
"strconv"
|
||||
"sync"
|
||||
|
||||
gossh "golang.org/x/crypto/ssh"
|
||||
)
|
||||
|
||||
const (
|
||||
forwardedTCPChannelType = "forwarded-tcpip"
|
||||
)
|
||||
|
||||
// direct-tcpip data struct as specified in RFC4254, Section 7.2
|
||||
type localForwardChannelData struct {
|
||||
DestAddr string
|
||||
DestPort uint32
|
||||
|
||||
OriginAddr string
|
||||
OriginPort uint32
|
||||
}
|
||||
|
||||
// DirectTCPIPHandler can be enabled by adding it to the server's
|
||||
// ChannelHandlers under direct-tcpip.
|
||||
func DirectTCPIPHandler(srv *Server, conn *gossh.ServerConn, newChan gossh.NewChannel, ctx Context) {
|
||||
d := localForwardChannelData{}
|
||||
if err := gossh.Unmarshal(newChan.ExtraData(), &d); err != nil {
|
||||
newChan.Reject(gossh.ConnectionFailed, "error parsing forward data: "+err.Error())
|
||||
return
|
||||
}
|
||||
|
||||
if srv.LocalPortForwardingCallback == nil || !srv.LocalPortForwardingCallback(ctx, d.DestAddr, d.DestPort) {
|
||||
newChan.Reject(gossh.Prohibited, "port forwarding is disabled")
|
||||
return
|
||||
}
|
||||
|
||||
dest := net.JoinHostPort(d.DestAddr, strconv.FormatInt(int64(d.DestPort), 10))
|
||||
|
||||
var dialer net.Dialer
|
||||
dconn, err := dialer.DialContext(ctx, "tcp", dest)
|
||||
if err != nil {
|
||||
newChan.Reject(gossh.ConnectionFailed, err.Error())
|
||||
return
|
||||
}
|
||||
|
||||
ch, reqs, err := newChan.Accept()
|
||||
if err != nil {
|
||||
dconn.Close()
|
||||
return
|
||||
}
|
||||
go gossh.DiscardRequests(reqs)
|
||||
|
||||
go func() {
|
||||
defer ch.Close()
|
||||
defer dconn.Close()
|
||||
io.Copy(ch, dconn)
|
||||
}()
|
||||
go func() {
|
||||
defer ch.Close()
|
||||
defer dconn.Close()
|
||||
io.Copy(dconn, ch)
|
||||
}()
|
||||
}
|
||||
|
||||
type remoteForwardRequest struct {
|
||||
BindAddr string
|
||||
BindPort uint32
|
||||
}
|
||||
|
||||
type remoteForwardSuccess struct {
|
||||
BindPort uint32
|
||||
}
|
||||
|
||||
type remoteForwardCancelRequest struct {
|
||||
BindAddr string
|
||||
BindPort uint32
|
||||
}
|
||||
|
||||
type remoteForwardChannelData struct {
|
||||
DestAddr string
|
||||
DestPort uint32
|
||||
OriginAddr string
|
||||
OriginPort uint32
|
||||
}
|
||||
|
||||
// ForwardedTCPHandler can be enabled by creating a ForwardedTCPHandler and
|
||||
// adding the HandleSSHRequest callback to the server's RequestHandlers under
|
||||
// tcpip-forward and cancel-tcpip-forward.
|
||||
type ForwardedTCPHandler struct {
|
||||
forwards map[string]net.Listener
|
||||
sync.Mutex
|
||||
}
|
||||
|
||||
func (h *ForwardedTCPHandler) HandleSSHRequest(ctx Context, srv *Server, req *gossh.Request) (bool, []byte) {
|
||||
h.Lock()
|
||||
if h.forwards == nil {
|
||||
h.forwards = make(map[string]net.Listener)
|
||||
}
|
||||
h.Unlock()
|
||||
conn := ctx.Value(ContextKeyConn).(*gossh.ServerConn)
|
||||
switch req.Type {
|
||||
case "tcpip-forward":
|
||||
var reqPayload remoteForwardRequest
|
||||
if err := gossh.Unmarshal(req.Payload, &reqPayload); err != nil {
|
||||
// TODO: log parse failure
|
||||
return false, []byte{}
|
||||
}
|
||||
if srv.ReversePortForwardingCallback == nil || !srv.ReversePortForwardingCallback(ctx, reqPayload.BindAddr, reqPayload.BindPort) {
|
||||
return false, []byte("port forwarding is disabled")
|
||||
}
|
||||
addr := net.JoinHostPort(reqPayload.BindAddr, strconv.Itoa(int(reqPayload.BindPort)))
|
||||
ln, err := net.Listen("tcp", addr)
|
||||
if err != nil {
|
||||
// TODO: log listen failure
|
||||
return false, []byte{}
|
||||
}
|
||||
_, destPortStr, _ := net.SplitHostPort(ln.Addr().String())
|
||||
destPort, _ := strconv.Atoi(destPortStr)
|
||||
h.Lock()
|
||||
h.forwards[addr] = ln
|
||||
h.Unlock()
|
||||
go func() {
|
||||
<-ctx.Done()
|
||||
h.Lock()
|
||||
ln, ok := h.forwards[addr]
|
||||
h.Unlock()
|
||||
if ok {
|
||||
ln.Close()
|
||||
}
|
||||
}()
|
||||
go func() {
|
||||
for {
|
||||
c, err := ln.Accept()
|
||||
if err != nil {
|
||||
// TODO: log accept failure
|
||||
break
|
||||
}
|
||||
originAddr, orignPortStr, _ := net.SplitHostPort(c.RemoteAddr().String())
|
||||
originPort, _ := strconv.Atoi(orignPortStr)
|
||||
payload := gossh.Marshal(&remoteForwardChannelData{
|
||||
DestAddr: reqPayload.BindAddr,
|
||||
DestPort: uint32(destPort),
|
||||
OriginAddr: originAddr,
|
||||
OriginPort: uint32(originPort),
|
||||
})
|
||||
go func() {
|
||||
ch, reqs, err := conn.OpenChannel(forwardedTCPChannelType, payload)
|
||||
if err != nil {
|
||||
// TODO: log failure to open channel
|
||||
log.Println(err)
|
||||
c.Close()
|
||||
return
|
||||
}
|
||||
go gossh.DiscardRequests(reqs)
|
||||
go func() {
|
||||
defer ch.Close()
|
||||
defer c.Close()
|
||||
io.Copy(ch, c)
|
||||
}()
|
||||
go func() {
|
||||
defer ch.Close()
|
||||
defer c.Close()
|
||||
io.Copy(c, ch)
|
||||
}()
|
||||
}()
|
||||
}
|
||||
h.Lock()
|
||||
delete(h.forwards, addr)
|
||||
h.Unlock()
|
||||
}()
|
||||
return true, gossh.Marshal(&remoteForwardSuccess{uint32(destPort)})
|
||||
|
||||
case "cancel-tcpip-forward":
|
||||
var reqPayload remoteForwardCancelRequest
|
||||
if err := gossh.Unmarshal(req.Payload, &reqPayload); err != nil {
|
||||
// TODO: log parse failure
|
||||
return false, []byte{}
|
||||
}
|
||||
addr := net.JoinHostPort(reqPayload.BindAddr, strconv.Itoa(int(reqPayload.BindPort)))
|
||||
h.Lock()
|
||||
ln, ok := h.forwards[addr]
|
||||
h.Unlock()
|
||||
if ok {
|
||||
ln.Close()
|
||||
}
|
||||
return true, nil
|
||||
default:
|
||||
return false, nil
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,83 @@
|
|||
package ssh
|
||||
|
||||
import (
|
||||
"crypto/rand"
|
||||
"crypto/rsa"
|
||||
"encoding/binary"
|
||||
|
||||
"golang.org/x/crypto/ssh"
|
||||
)
|
||||
|
||||
func generateSigner() (ssh.Signer, error) {
|
||||
key, err := rsa.GenerateKey(rand.Reader, 2048)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return ssh.NewSignerFromKey(key)
|
||||
}
|
||||
|
||||
func parsePtyRequest(s []byte) (pty Pty, ok bool) {
|
||||
term, s, ok := parseString(s)
|
||||
if !ok {
|
||||
return
|
||||
}
|
||||
width32, s, ok := parseUint32(s)
|
||||
if !ok {
|
||||
return
|
||||
}
|
||||
height32, _, ok := parseUint32(s)
|
||||
if !ok {
|
||||
return
|
||||
}
|
||||
pty = Pty{
|
||||
Term: term,
|
||||
Window: Window{
|
||||
Width: int(width32),
|
||||
Height: int(height32),
|
||||
},
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func parseWinchRequest(s []byte) (win Window, ok bool) {
|
||||
width32, s, ok := parseUint32(s)
|
||||
if width32 < 1 {
|
||||
ok = false
|
||||
}
|
||||
if !ok {
|
||||
return
|
||||
}
|
||||
height32, _, ok := parseUint32(s)
|
||||
if height32 < 1 {
|
||||
ok = false
|
||||
}
|
||||
if !ok {
|
||||
return
|
||||
}
|
||||
win = Window{
|
||||
Width: int(width32),
|
||||
Height: int(height32),
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func parseString(in []byte) (out string, rest []byte, ok bool) {
|
||||
if len(in) < 4 {
|
||||
return
|
||||
}
|
||||
length := binary.BigEndian.Uint32(in)
|
||||
if uint32(len(in)) < 4+length {
|
||||
return
|
||||
}
|
||||
out = string(in[4 : 4+length])
|
||||
rest = in[4+length:]
|
||||
ok = true
|
||||
return
|
||||
}
|
||||
|
||||
func parseUint32(in []byte) (uint32, []byte, bool) {
|
||||
if len(in) < 4 {
|
||||
return 0, nil, false
|
||||
}
|
||||
return binary.BigEndian.Uint32(in), in[4:], true
|
||||
}
|
||||
|
|
@ -0,0 +1,33 @@
|
|||
package ssh
|
||||
|
||||
import gossh "golang.org/x/crypto/ssh"
|
||||
|
||||
// PublicKey is an abstraction of different types of public keys.
|
||||
type PublicKey interface {
|
||||
gossh.PublicKey
|
||||
}
|
||||
|
||||
// The Permissions type holds fine-grained permissions that are specific to a
|
||||
// user or a specific authentication method for a user. Permissions, except for
|
||||
// "source-address", must be enforced in the server application layer, after
|
||||
// successful authentication.
|
||||
type Permissions struct {
|
||||
*gossh.Permissions
|
||||
}
|
||||
|
||||
// A Signer can create signatures that verify against a public key.
|
||||
type Signer interface {
|
||||
gossh.Signer
|
||||
}
|
||||
|
||||
// ParseAuthorizedKey parses a public key from an authorized_keys file used in
|
||||
// OpenSSH according to the sshd(8) manual page.
|
||||
func ParseAuthorizedKey(in []byte) (out PublicKey, comment string, options []string, rest []byte, err error) {
|
||||
return gossh.ParseAuthorizedKey(in)
|
||||
}
|
||||
|
||||
// ParsePublicKey parses an SSH public key formatted for use in
|
||||
// the SSH wire protocol according to RFC 4253, section 6.6.
|
||||
func ParsePublicKey(in []byte) (out PublicKey, err error) {
|
||||
return gossh.ParsePublicKey(in)
|
||||
}
|
||||
|
|
@ -13,7 +13,6 @@ package unix
|
|||
|
||||
import (
|
||||
"encoding/binary"
|
||||
"net"
|
||||
"runtime"
|
||||
"syscall"
|
||||
"unsafe"
|
||||
|
|
@ -765,7 +764,7 @@ const px_proto_oe = 0
|
|||
|
||||
type SockaddrPPPoE struct {
|
||||
SID uint16
|
||||
Remote net.HardwareAddr
|
||||
Remote []byte
|
||||
Dev string
|
||||
raw RawSockaddrPPPoX
|
||||
}
|
||||
|
|
@ -916,7 +915,7 @@ func anyToSockaddr(fd int, rsa *RawSockaddrAny) (Sockaddr, error) {
|
|||
}
|
||||
sa := &SockaddrPPPoE{
|
||||
SID: binary.BigEndian.Uint16(pp[6:8]),
|
||||
Remote: net.HardwareAddr(pp[8:14]),
|
||||
Remote: pp[8:14],
|
||||
}
|
||||
for i := 14; i < 14+IFNAMSIZ; i++ {
|
||||
if pp[i] == 0 {
|
||||
|
|
|
|||
|
|
@ -254,6 +254,7 @@ type Ptmget C.struct_ptmget
|
|||
|
||||
const (
|
||||
AT_FDCWD = C.AT_FDCWD
|
||||
AT_SYMLINK_FOLLOW = C.AT_SYMLINK_FOLLOW
|
||||
AT_SYMLINK_NOFOLLOW = C.AT_SYMLINK_NOFOLLOW
|
||||
)
|
||||
|
||||
|
|
|
|||
|
|
@ -241,6 +241,7 @@ type Winsize C.struct_winsize
|
|||
|
||||
const (
|
||||
AT_FDCWD = C.AT_FDCWD
|
||||
AT_SYMLINK_FOLLOW = C.AT_SYMLINK_FOLLOW
|
||||
AT_SYMLINK_NOFOLLOW = C.AT_SYMLINK_NOFOLLOW
|
||||
)
|
||||
|
||||
|
|
|
|||
|
|
@ -411,6 +411,7 @@ type Ptmget struct {
|
|||
|
||||
const (
|
||||
AT_FDCWD = -0x64
|
||||
AT_SYMLINK_FOLLOW = 0x400
|
||||
AT_SYMLINK_NOFOLLOW = 0x200
|
||||
)
|
||||
|
||||
|
|
|
|||
|
|
@ -418,6 +418,7 @@ type Ptmget struct {
|
|||
|
||||
const (
|
||||
AT_FDCWD = -0x64
|
||||
AT_SYMLINK_FOLLOW = 0x400
|
||||
AT_SYMLINK_NOFOLLOW = 0x200
|
||||
)
|
||||
|
||||
|
|
|
|||
|
|
@ -416,6 +416,7 @@ type Ptmget struct {
|
|||
|
||||
const (
|
||||
AT_FDCWD = -0x64
|
||||
AT_SYMLINK_FOLLOW = 0x400
|
||||
AT_SYMLINK_NOFOLLOW = 0x200
|
||||
)
|
||||
|
||||
|
|
|
|||
|
|
@ -418,6 +418,7 @@ type Ptmget struct {
|
|||
|
||||
const (
|
||||
AT_FDCWD = -0x64
|
||||
AT_SYMLINK_FOLLOW = 0x400
|
||||
AT_SYMLINK_NOFOLLOW = 0x200
|
||||
)
|
||||
|
||||
|
|
|
|||
|
|
@ -436,6 +436,7 @@ type Winsize struct {
|
|||
|
||||
const (
|
||||
AT_FDCWD = -0x64
|
||||
AT_SYMLINK_FOLLOW = 0x4
|
||||
AT_SYMLINK_NOFOLLOW = 0x2
|
||||
)
|
||||
|
||||
|
|
|
|||
|
|
@ -436,6 +436,7 @@ type Winsize struct {
|
|||
|
||||
const (
|
||||
AT_FDCWD = -0x64
|
||||
AT_SYMLINK_FOLLOW = 0x4
|
||||
AT_SYMLINK_NOFOLLOW = 0x2
|
||||
)
|
||||
|
||||
|
|
|
|||
|
|
@ -437,6 +437,7 @@ type Winsize struct {
|
|||
|
||||
const (
|
||||
AT_FDCWD = -0x64
|
||||
AT_SYMLINK_FOLLOW = 0x4
|
||||
AT_SYMLINK_NOFOLLOW = 0x2
|
||||
)
|
||||
|
||||
|
|
|
|||
|
|
@ -430,6 +430,7 @@ type Winsize struct {
|
|||
|
||||
const (
|
||||
AT_FDCWD = -0x64
|
||||
AT_SYMLINK_FOLLOW = 0x4
|
||||
AT_SYMLINK_NOFOLLOW = 0x2
|
||||
)
|
||||
|
||||
|
|
|
|||
|
|
@ -294,7 +294,7 @@ func NewCallbackCDecl(fn interface{}) uintptr {
|
|||
//sys clsidFromString(lpsz *uint16, pclsid *GUID) (ret error) = ole32.CLSIDFromString
|
||||
//sys stringFromGUID2(rguid *GUID, lpsz *uint16, cchMax int32) (chars int32) = ole32.StringFromGUID2
|
||||
//sys coCreateGuid(pguid *GUID) (ret error) = ole32.CoCreateGuid
|
||||
//sys coTaskMemFree(address unsafe.Pointer) = ole32.CoTaskMemFree
|
||||
//sys CoTaskMemFree(address unsafe.Pointer) = ole32.CoTaskMemFree
|
||||
//sys rtlGetVersion(info *OsVersionInfoEx) (ret error) = ntdll.RtlGetVersion
|
||||
|
||||
// syscall interface implementation for other packages
|
||||
|
|
@ -1302,7 +1302,7 @@ func (t Token) KnownFolderPath(folderID *KNOWNFOLDERID, flags uint32) (string, e
|
|||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
defer coTaskMemFree(unsafe.Pointer(p))
|
||||
defer CoTaskMemFree(unsafe.Pointer(p))
|
||||
return UTF16ToString((*[(1 << 30) - 1]uint16)(unsafe.Pointer(p))[:]), nil
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -2517,7 +2517,7 @@ func coCreateGuid(pguid *GUID) (ret error) {
|
|||
return
|
||||
}
|
||||
|
||||
func coTaskMemFree(address unsafe.Pointer) {
|
||||
func CoTaskMemFree(address unsafe.Pointer) {
|
||||
syscall.Syscall(procCoTaskMemFree.Addr(), 1, uintptr(address), 0, 0)
|
||||
return
|
||||
}
|
||||
|
|
|
|||
|
|
@ -15,6 +15,8 @@ github.com/Unknwon/i18n
|
|||
github.com/Unknwon/paginater
|
||||
# github.com/andybalholm/cascadia v0.0.0-20161224141413-349dd0209470
|
||||
github.com/andybalholm/cascadia
|
||||
# github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239
|
||||
github.com/anmitsu/go-shlex
|
||||
# github.com/beorn7/perks v1.0.0
|
||||
github.com/beorn7/perks/quantile
|
||||
# github.com/blevesearch/bleve v0.0.0-20190214220507-05d86ea8f6e3
|
||||
|
|
@ -112,6 +114,8 @@ github.com/facebookgo/grace/gracenet
|
|||
github.com/facebookgo/httpdown
|
||||
# github.com/facebookgo/stats v0.0.0-20151006221625-1b76add642e4
|
||||
github.com/facebookgo/stats
|
||||
# github.com/gliderlabs/ssh v0.2.2
|
||||
github.com/gliderlabs/ssh
|
||||
# github.com/glycerine/go-unsnap-stream v0.0.0-20180323001048-9f0cb55181dd
|
||||
github.com/glycerine/go-unsnap-stream
|
||||
# github.com/go-macaron/binding v0.0.0-20160711225916-9440f336b443
|
||||
|
|
@ -353,7 +357,7 @@ golang.org/x/crypto/cast5
|
|||
golang.org/x/crypto/openpgp/elgamal
|
||||
golang.org/x/crypto/ssh/knownhosts
|
||||
golang.org/x/crypto/ssh/agent
|
||||
# golang.org/x/net v0.0.0-20190613194153-d28f0bde5980
|
||||
# golang.org/x/net v0.0.0-20190619014844-b5b0513f8c1b
|
||||
golang.org/x/net/html/charset
|
||||
golang.org/x/net/html
|
||||
golang.org/x/net/html/atom
|
||||
|
|
@ -365,7 +369,7 @@ golang.org/x/net/internal/socks
|
|||
# golang.org/x/oauth2 v0.0.0-20181101160152-c453e0c75759
|
||||
golang.org/x/oauth2
|
||||
golang.org/x/oauth2/internal
|
||||
# golang.org/x/sys v0.0.0-20190618155005-516e3c20635f
|
||||
# golang.org/x/sys v0.0.0-20190620070143-6f217b454f45
|
||||
golang.org/x/sys/windows
|
||||
golang.org/x/sys/windows/svc
|
||||
golang.org/x/sys/unix
|
||||
|
|
|
|||
Loading…
Reference in New Issue