similar to: KEX graceful failure

Hello, This bug exists in 5.0p1. I apologize that I couldn't test against HEAD. I _believe_ I have found a race condition in sshd. In the v2 protocol, after a connection, the accepting process forks in privsep_preauth(). The parent executes monitor_child_preauth() to allow certain privsep requests necessary for authentication. The unprivileged child runs do_ssh2_kex() followed by

https://bugzilla.mindrot.org/show_bug.cgi?id=1582 Summary: memory leak in do_ssh2_kex() routine (sshd.c) Product: Portable OpenSSH Version: 5.2p1 Platform: All OS/Version: All Status: NEW Severity: normal Priority: P2 Component: sshd AssignedTo: unassigned-bugs at mindrot.org ReportedBy:

Hello everyone.. I am fairly new to the patching format.. so I just decided to post a basic info about how to remove group1 and group14 diffie key exchange in OpenSSH. I know that they are listed as required in RFC 4253 but I don't want a client to have the choice to use a 1024 bit prime for the key exchange. If someone is getting into my system.. they should upgrade to a new client. I am a

Hi guys Apparently, there is small memory leak in the do_ssh2_kex() routine in sshd.c. Line 2195 in sshd.c states: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = list_hostkey_types(); Where list_hostkey_types() returns a pointer allocated by the xstrdup call (line 735). This pointer should be freed in the calling routine do_ssh2_key(). Should I make a patch for this? Also, since my previous patch

Hi, So I screwed up when writing the support for the curve25519 KEX method that doesn't depend on OpenSSL's BIGNUM type - a bug in my code left leading zero bytes where they should have been skipped. The impact of this is that OpenSSH 6.5 and 6.6 will fail during key exchange with a peer that implements curve25519-sha256 at libssh.org properly about 0.2% of the time (one in every 512ish

Using ssh2 via agent to connect through proxy to sshd host. Each connection (client to proxy, proxy to host) takes an average of 22 seconds, totaling approximately 44 seconds for a complete connection. Debug logging with vmstat directed to the same file indicates two points where a majority of time is spent (have looked at the similar postings): debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP (*6

Dear OpenSSH developers, I've worked this week on an alternative key exchange mechanism, in reaction to the whole NSA leaks and claims over cryptographic backdoors and/or cracking advances. The key exchange is in my opinion the most critical defense against passive eavesdropping attacks. I believe Curve25519 from DJB can give users a secure alternative to classical Diffie-Hellman (with fixed

Hello, For a key exchange algorithm I'm working on, I would like to keep a little bit of shared state between the main server process and the processes that clients connect to. So far, I'm considering mmap for the purpose. But I cannot figure out where I need to put the mmap initialization call, where it would be called at server startup (before any fork()s/exec()s), and never again.

Hello OpenSSH developers, openssh 4.2p1 breaks old openssh clients up to 3.4p1 when they try to use compression: # ssh-3.4p1 -C remote-host-with-4.2p1 pwd no matching comp found: client zlib server none,zlib at openssh.com option "-vv" shows ... debug2: kex_parse_kexinit: zlib ... debug2: kex_parse_kexinit: none,zlib at openssh.com ... debug2: mac_init: found hmac-md5 no

Suppose an SSH server has both RSA and DSA host keys for protocol 2, but I only have the DSA key, and I want to use that. I'm stuck; the OpenSSH client is hard-wired to offer both algorithms in the key exchange, and will select ssh-rsa if it's available (see myproposal.h, KEX_DEFAULT_PK_ALG). Below is a patch adding the client configuration option "PKAlgorithms" for this

this (uncomplete) patch makes various features compile time options and saves up to 24K in the resulting ssh/sshd binaries. i don't know whether this should be added to the CVS since it makes the code less readable. perhaps WITH_COMPRESSION should be added, since it removes the dependency on libz -m Index: Makefile.inc =================================================================== RCS

https://bugzilla.mindrot.org/show_bug.cgi?id=1487 Summary: Race condition between monitor and unprivileged child in sshd Classification: Unclassified Product: Portable OpenSSH Version: 5.0p1 Platform: All OS/Version: All Status: NEW Severity: normal Priority: P2 Component: sshd

In sshconnect.c there are two global variables for server_version_string client_version_string. These are used just in a few functions and can easily be passed as parameters. Also, there is a strange construct, where their memory is allocated to the global pointers, then copies of these pointers are assigned to the kex structure. The kex_free finally frees them via cleanup of the kex

Hi, About a year and a half ago I brought up the topic of encrypted hostkeys and posted a patch (http://marc.info/?l=openssh-unix-dev&m=132774431906364&w=2), and while the general reaction seemed receptive to the idea, a few problems were pointed out with the implementation (UI issues, ssh-keysign breakage). I've finally had some spare time in which to get back to this, and I've

The attached patches fixes and cleans up the build when configured with --without-openssl. Summary: * Fix KEX_SERVER_ENCRYPT macro in myproposal.h * Fix unresolved symbols in ssh-keygen.c * Isolate openssl code and extend WITH_OPENSSL wrappers around it * Make ed25519 default key type in ssh-keygen when configured --without-openssl -------------- next part -------------- A non-text attachment was

If I am trying to build OpenSSH 6.6 with Kerberos GSSAPI support, do I still need to get Simon Wilkinson's patches? --- Scott Neugroschl | XYPRO Technology Corporation 4100 Guardian Street | Suite 100 |Simi Valley, CA 93063 | Phone 805 583-2874|Fax 805 583-0124 |

Hi, I'm having a problem with ssh-keygen on Solaris 8; upon running, it produces a bus error due to a function call in OpenSSL (RC4_set_key): [...] (gdb) where #0 0x3440c in RC4_set_key () #1 0x2b890 in arc4random_stir () at /merc/tools/src/openssh-2.3.0p1/bsd-arc4random.c:65 #2 0x23ca8 in main (ac=1, av=0xffbefb94) at /merc/tools/src/openssh-2.3.0p1/ssh-keygen.c:720 I get

https://bugzilla.mindrot.org/show_bug.cgi?id=2527 Bug ID: 2527 Summary: default algorithms mismatch between man pages and myproposal.h Product: Portable OpenSSH Version: 7.1p1 Hardware: All OS: All Status: NEW Severity: major Priority: P5 Component: Documentation

hello.. i am running openssh-3.7.1p2. on linux.It is working successfully..and daemon is running &client also connecting.But the problem is with the mips architecture when i connecting this server from remote syytem.?i got an error of buufer_get:trying to get more bytes 1 than buffer0.And client is not connecting from remote system.My out is as follows on my server ?in sshd main before

Here is a quick patch against openssh-2.5.1p1 to add a new config option (pkalg) for the ssh client allowing the selection of which public keys are obtained/verified. --cut-here- diff -c3 -r orig/openssh-2.5.1p1/key.c openssh-2.5.1p1/key.c *** orig/openssh-2.5.1p1/key.c Mon Feb 5 18:16:28 2001 --- openssh-2.5.1p1/key.c Sun Mar 11 23:10:10 2001 *************** *** 534,539 **** --- 534,567 ----