Mailing List Archive

http://bugzilla.mindrot.org/show_bug.cgi?id=833

Summary: sshd server sends SshMsgChannelFailure despite of
successfully running sftp server
Product: Portable OpenSSH
Version: 3.8p1
Platform: All
OS/Version: Cygwin on NT/2k
Status: NEW
Severity: normal
Priority: P2
Component: sshd
AssignedTo: openssh-bugs@mindrot.org
ReportedBy: anforowicz@mimuw.edu.pl
CC: anforowicz@mimuw.edu.pl


I think, that the server should respond with SshMsgChannelSuccess after
successfully starting sftp subsystem. OpenSsh sshd responds with
SshMsgChannelFailure even though my client can later talk with the server.

The bug shows up on WindosXp/Cygwin and on Linux.

I am not sure if this bug should be assigned to 'sshd' or 'sftp-server'.

Steps to reproduce the bug:
1. open connection to a sshd server
2. exchange keys and authenticate user
3. open a ssh channel
4. send SSH_MSG_CHANNEL_REQUEST for sftp subsystem
5. observe how the server responds with
- SSH_MSG_CHANNEL_WINDOWS_ADJUST
- -----> SSH_MSG_CHANNEL_FAILURE <-------- (a bug?)
6. continue talking with the sftp server as if nothing happened
(I can do everything I would expect to: ls, get, put, etc.)


Verbose log from my client (showing sent and received ssh messages) follows.

---------sendSshMsg/sent message follows:
Kexinit {cookie = [233,175,242,83,223,235,73,20,255,141,1,87,103,225,194,124], k
exAlgs = ["diffie-hellman-group1-sha1"], serverHostKeyAlgs = ["ssh-dss"], encryp
tionAlgsClnt2Srvr = ["3des-cbc"], encryptionAlgsSrvr2Clnt = ["3des-cbc"], macAlg
sClnt2Srvr = ["hmac-sha1"], macAlgsSrvr2Clnt = ["hmac-sha1"], compressionAlgsCln
t2Srvr = ["none"], compressionAlgsSrvr2Clnt = ["none"], languagesClnt2Srvr = [],
languagesSrvr2Clnt = [], firstKexPacketFollows = False, reserved = 0}
---------sendSshMsg/sent message ends.
---------readingThread/rcvd message follows:
Kexinit {cookie = [50,238,207,15,169,90,234,102,37,223,136,65,198,251,101,37], k
exAlgs = ["diffie-hellman-group-exchange-sha1","diffie-hellman-group1-sha1"], se
rverHostKeyAlgs = ["ssh-rsa","ssh-dss"], encryptionAlgsClnt2Srvr = ["aes128-cbc"
,"3des-cbc","blowfish-cbc","cast128-cbc","arcfour","aes192-cbc","aes256-cbc","ri
jndael-cbc@lysator.liu.se","aes128-ctr","aes192-ctr","aes256-ctr"], encryptionAl
gsSrvr2Clnt =
["aes128-cbc","3des-cbc","blowfish-cbc","cast128-cbc","arcfour","aes192-cbc","aes256-cbc","rijndael-cbc@lysator.liu.se","aes128-ctr","aes192-ctr","aes256-ctr"],
macAlgsClnt2Srvr =
["hmac-md5","hmac-sha1","hmac-ripemd160","hmac-ripemd160@openssh.com","hmac-sha1-96","hmac-md5-96"],
macAlgsSrvr2Clnt =
["hmac-md5","hmac-sha1","hmac-ripemd160","hmac-ripemd160@openssh.com","hmac-sha1-96","hmac-md5-96"],
compressionAlgsClnt2Srvr = ["none","zlib"], compressionAlgsSrvr2Clnt =
["none","zlib"], languagesClnt2Srvr = [], languagesSrvr2Clnt = [],
firstKexPacketFollows = False, reserved = 0}
---------readingThread/rcvd message ends.
---------sendSshMsg/sent message follows:
Kexdh_init {eInteger =
18633255786787081608156836570309995274512701348955067998513396793082007292289160726682844268171120018964946091492033960675625166491968204969903216602165453153724816384536430513735406968284630674980652430195416331046850595734481479051734705432043779259464936222585571846317512885512796504946348076764496827837}
---------sendSshMsg/sent message ends.
---------readingThread/rcvd message follows:
Kexdh_reply {srvrPublicHostKeyAndCertificates =
[0,0,0,7,115,115,104,45,100,115,115,0,0,0,129,0,166,197,156,245,233,143,182,171,129,160,11,149,153,226,20,20,45,203,181,33,210,238,83,146,189,172,38,142,5,149,33,1,82,73,169,110,169,200,103,249,210,68,111,125,8,139,146,133,160,209,52,208,195,160,205,65,175,78,4,199,10,58,233,41,64,46,100,25,188,95,136,196,250,137,159,3,66,82,250,233,82,188,21,63,71,149,12,151,80,235,18,56,78,163,52,218,238,64,97,226,92,11,232,211,93,85,165,222,132,59,85,112,131,254,154,138,56,214,93,68,54,144,41,146,222,62,169,85,0,0,0,21,0,219,121,198,165,225,157,226,123,110,214,236,203,102,93,150,160,177,107,115,23,0,0,0,128,46,206,46,106,72,170,114,83,206,156,8,200,34,51,197,221,250,226,207,200,107,58,249,171,83,68,19,52,64,183,113,156,99,78,190,239,222,98,118,228,129,229,41,178,5,211,237,233,200,117,40,184,158,73,128,28,215,161,175,188,158,105,198,231,228,38,101,206,214,61,215,212,167,107,35,72,195,56,117,226,30,49,215,242,253,207,165,32,138,187,13,247,188,204,115,38,133,136,151,221,219,101,12,193,146,127,209,130,125,154,180,84,2,142,10,81,162,36,216,22,99,82,165,38,108,203,23,99,0,0,0,129,0,158,127,244,88,51,92,120,15,22,150,107,187,83,199,40,97,114,166,140,204,159,83,200,120,82,121,64,175,97,53,97,87,178,133,46,232,155,23,167,220,233,76,175,199,123,69,167,24,165,63,212,110,55,175,23,115,20,2,132,35,44,120,152,52,21,216,58,77,69,207,170,210,159,64,79,217,182,9,75,168,227,230,163,10,210,228,113,21,91,86,112,158,238,46,194,82,28,10,10,192,216,27,113,233,111,228,219,215,48,7,51,197,216,175,136,89,100,35,164,175,56,79,70,238,137,221,77,24],
fInteger =
17045365973072878852930627388920946932870494510128823028158775245163523341982978135426690438187125675753742647757222332381007234885115523309372458013542884564113495349166671833985131624728346582145833511579268448523614768062070103498327188796294300623975527317948841366028896223362692963268540349404383209626,
signatureOfH = [
0,0,0,7,115,115,104,45,100,115,115,0,0,0,40,179,177,71,143,103,192,249,85,156,37,143,0,69,142,203,102,99,186,128,167,18,188,224,93,232,224,51,8,86,70,75,141,153,211,39,217,67,213,240,145]}
---------readingThread/rcvd message ends.
---------sendSshMsg/sent message follows:
Newkeys
---------sendSshMsg/sent message ends.
---------readingThread/rcvd message follows:
Newkeys
---------readingThread/rcvd message ends.
---------sendSshMsg/sent message follows:
Service_request {serviceName = "ssh-userauth"}
---------sendSshMsg/sent message ends.
---------readingThread/rcvd message follows:
Service_accept {serviceName = "ssh-userauth"}
---------readingThread/rcvd message ends.
login: lukasz
password: ---------sendSshMsg/sent message follows:
Userauth_request {userName = "lukasz", serviceName = "ssh-connection",
methodName = "password", authData = [confidential :-)]}
---------sendSshMsg/sent message ends.
---------readingThread/rcvd message follows:
Userauth_success
---------readingThread/rcvd message ends.
Logged in successfully.
---------sendSshMsg/sent message follows:
Channel_open {channelType = "session", senderChannel = 12345, initialWindowSize
= 2147483648, maximumPacketSize = 2147483648}
---------sendSshMsg/sent message ends.
---------readingThread/rcvd message follows:
Channel_open_cnfrmtn {recipientChannel = 12345, senderChannel = 0,
initialWindowSize = 0, maximumPacketSize = 32768, channelData = []}
---------readingThread/rcvd message ends.
---------sendSshMsg/sent message follows:
Channel_request {recipientChannel = 0, requestType = "subsystem", wantReply =
True, dataBody = [0,0,0,4,115,102,116,112]}
---------sendSshMsg/sent message ends.
---------readingThread/rcvd message follows:
Channel_window_adjust {recipientChannel = 12345, bytesToAdd = 131072}
---------readingThread/rcvd message ends.
---------readingThread/rcvd message follows:
Channel_failure {recipientChannel = 12345}
^^^^^THIS IS THE MESSAGE I DIDN'T EXPECT TO RECEIVE
---------readingThread/rcvd message ends.
---------sendSshMsg/sent message follows:
Channel_data {recipientChannel = 0, dataBody = [0,0,0,5,1,0,0,0,5]}
---------sendSshMsg/sent message ends.
---------readingThread/rcvd message follows:
Channel_data {recipientChannel = 12345, dataBody = [0,0,0,5,2,0,0,0,3]}
---------readingThread/rcvd message ends.



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