[Bug 833] sshd server sends SshMsgChannelFailure despite of successfully running sftp server

bugzilla-daemon at mindrot.org bugzilla-daemon at mindrot.org
Tue Apr 6 19:59:58 EST 2004 

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 at mindrot.org
        ReportedBy: anforowicz at mimuw.edu.pl
                CC: anforowicz at 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 at 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 at lysator.liu.se","aes128-ctr","aes192-ctr","aes256-ctr"],
macAlgsClnt2Srvr =
["hmac-md5","hmac-sha1","hmac-ripemd160","hmac-ripemd160 at openssh.com","hmac-sha1-96","hmac-md5-96"],
macAlgsSrvr2Clnt =
["hmac-md5","hmac-sha1","hmac-ripemd160","hmac-ripemd160 at 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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