Hi Matt, During investigation I outputted list of the keys in dropbear. And I saw that requested key cannot be found because the list was corrupted. In NOMMU architectures memory corruption is frequently happens when stack pointer is running beyond stack size. I checked stack size setting of dropbear in flat binary header with flthdr utility from cross tool-chain. And it showed that stack size was default 4K. What is usually very low. Default stack size was used because "-Wl,-elf2flt=..." parameters were passed only in CFLAGS. But dropbear make procedure does use only LDFLAGS during linking and no CFLAGS.
I started increasing stack size with "flthdr -s " and finally with 32K it was working as expected. Regards, Konstantin Lazarev. On Sun, Jan 29, 2017 at 5:17 AM, Matt Johnston <m...@ucc.asn.au> wrote: > Hi Konstantin, > > Glad you found what the problem was. Out of interest how did you figure it > was a stack size issue? It might be useful as a debugging step for other > people in future. > 32kB seems a like a lot, I'll have a look if there's anything that could > be improved in Dropbear or libtommath. > > Cheers, > Matt > > On Sat 28/1/2017, at 3:14 am, Konstantin Lazarev <cnlaza...@gmail.com> > wrote: > > Hi Matt, > > The SEGV was related to the size of insufficient stack set for the > dropbear flat binary. > After setting stack to 32K problem is not observed any more. SSH client > login with key parameters is working as expected. > > Thank you, > Konstantin Lazarev. > > On Wed, Jan 18, 2017 at 2:32 PM, Konstantin Lazarev <cnlaza...@gmail.com> > wrote: > >> Hi Matt, >> >> Dropbear is usually running under inetd in our system. I provide >> foreground run only for debug output. When dropbear runs from inetd SSH >> client either received connection rejection or nothing because dropbear >> crush. >> And when default algo is used ecdsa-sha2-nistp521 is reported by client. >> Please see log: >> $ ssh -v root@172.17.152.20 >> >> OpenSSH_7.2p2 Ubuntu-4ubuntu2.1, OpenSSL 1.0.2g 1 Mar 2016 >> debug1: Reading configuration data /etc/ssh/ssh_config >> debug1: /etc/ssh/ssh_config line 19: Applying options for * >> debug1: Connecting to 172.17.152.20 [172.17.152.20] port 22. >> debug1: Connection established. >> debug1: key_load_public: No such file or directory >> debug1: identity file /home//.ssh/id_rsa type >> -1 >> >> >> >> debug1: key_load_public: No such file or directory >> >> >> >> >> debug1: identity file /home//.ssh/id_rsa-cert type >> -1 >> >> >> >> debug1: key_load_public: No such file or directory >> >> >> >> >> debug1: identity file /home//.ssh/id_dsa type >> -1 >> >> >> >> debug1: key_load_public: No such file or directory >> >> >> >> >> debug1: identity file /home//.ssh/id_dsa-cert type >> -1 >> >> >> >> debug1: key_load_public: No such file or directory >> >> >> >> >> debug1: identity file /home//.ssh/id_ecdsa type >> -1 >> >> >> >> debug1: key_load_public: No such file or directory >> >> >> >> >> debug1: identity file /home//.ssh/id_ecdsa-cert type >> -1 >> >> >> >> debug1: key_load_public: No such file or directory >> >> >> >> >> debug1: identity file /home//.ssh/id_ed25519 type >> -1 >> >> >> >> debug1: key_load_public: No such file or directory >> >> >> >> >> debug1: identity file /home//.ssh/id_ed25519-cert type >> -1 >> >> >> >> debug1: Enabling compatibility mode for protocol >> 2.0 >> >> >> >> debug1: Local version string SSH-2.0-OpenSSH_7.2p2 >> Ubuntu-4ubuntu2.1 >> >> >> >> debug1: Remote protocol version 2.0, remote software version >> dropbear_2016.74 >> >> >> >> debug1: no match: dropbear_2016.74 >> >> >> >> >> debug1: Authenticating to 172.17.152.20:22 as >> 'root' >> >> >> >> debug1: SSH2_MSG_KEXINIT sent >> >> >> >> >> debug1: SSH2_MSG_KEXINIT received >> >> >> >> >> debug1: kex: algorithm: curve25519-sha...@libssh.org >> >> >> >> >> debug1: kex: host key algorithm: ecdsa-sha2-nistp521 >> >> >> >> >> debug1: kex: server->client cipher: aes128-ctr MAC: hmac-sha2-256 >> compression: none >> >> >> debug1: kex: client->server cipher: aes128-ctr MAC: hmac-sha2-256 >> compression: none >> >> >> debug1: expecting SSH2_MSG_KEX_ECDH_REPLY >> >> >> >> >> debug1: Server host key: ecdsa-sha2-nistp521 >> SHA256:F7fYb86a+/mzH75THk014kULrbPL93EVj4jwpKsngso >> >> >> >> The authenticity of host '172.17.152.20 (172.17.152.20)' can't be >> established. >> >> >> >> ECDSA key fingerprint is SHA256:F7fYb86a+/mzH75THk014kU >> LrbPL93EVj4jwpKsngso. >> >> >> >> Are you sure you want to continue connecting (yes/no)? >> yes >> >> >> >> Warning: Permanently added '172.17.152.20' (ECDSA) to the list of known >> hosts. >> >> >> >> debug1: rekey after 4294967296 blocks >> >> >> >> >> debug1: SSH2_MSG_NEWKEYS sent >> >> >> >> >> debug1: expecting SSH2_MSG_NEWKEYS >> >> >> >> >> debug1: rekey after 4294967296 blocks >> debug1: SSH2_MSG_NEWKEYS received >> debug1: SSH2_MSG_SERVICE_ACCEPT received >> debug1: Authentications that can continue: publickey,password >> debug1: Next authentication method: publickey >> debug1: Trying private key: /home//.ssh/id_rsa >> debug1: Trying private key: /home//.ssh/id_dsa >> debug1: Trying private key: /home//.ssh/id_ecdsa >> debug1: Trying private key: /home//.ssh/id_ed25519 >> debug1: Next authentication method: password >> root@172.17.152.20's password: >> debug1: Authentication succeeded (password). >> Authenticated to 172.17.152.20 ([172.17.152.20]:22). >> debug1: channel 0: new [client-session] >> debug1: Entering interactive session. >> debug1: pledge: network >> debug1: Sending environment. >> debug1: Sending env LANG = en_US.UTF-8 >> >> >> [root@172.17.152.20: ]# >> >> Regards, >> Konstantin Lazarev. >> >> >> On Wed, Jan 18, 2017 at 5:13 AM, Matt Johnston <m...@ucc.asn.au> wrote: >> >>> Hi Konstantin, >>> >>> Would you be able to run Dropbear under inetd and see if that helps? >>> uClinux generally requires that - though it's not obvious to me how it >>> could cause this crash. >>> Is there any chance of getting a backtrace where it is crashing? The RSA >>> and DSS crashes are at different spots, so I guess some global state might >>> be getting corrupted. >>> When it successfully runs (no HostKeyAlgorithms) I assume it is using >>> ecdsa for the hostkey? >>> >>> Cheers, >>> Matt >>> >>> >>> On Wed 18/1/2017, at 8:53 am, Konstantin Lazarev <cnlaza...@gmail.com> >>> wrote: >>> >>> Hello, >>> >>> I see consistent SEGV when running Dropbear v2016.74 in uClinux 2.6.33 >>> on ARMv7m-cortex-m4 processor >>> Faults happen only if client specifying HostKeyAlgorithms option. >>> Please see verbose output from client and dropbear: >>> >>> [root@172.17.152.20: ]# dropbear -V >>> Dropbear v2016.74 >>> >>> ---------------------------------------- from client >>> ------------------------------------------------------------ >>> --------------- >>> $ssh -v -o HostKeyAlgorithms=ssh-dss root@172.17.152.20 >>> OpenSSH_7.2p2 Ubuntu-4ubuntu2.1, OpenSSL 1.0.2g 1 Mar 2016 >>> debug1: Reading configuration data /etc/ssh/ssh_config >>> debug1: /etc/ssh/ssh_config line 19: Applying options for * >>> debug1: Connecting to 172.17.152.20 [172.17.152.20] port 22. >>> debug1: Connection established. >>> debug1: key_load_public: No such file or directory >>> debug1: identity file /home//.ssh/id_rsa type -1 >>> debug1: key_load_public: No such file or directory >>> debug1: identity file /home//.ssh/id_rsa-cert type -1 >>> debug1: key_load_public: No such file or directory >>> debug1: identity file /home//.ssh/id_dsa type -1 >>> debug1: key_load_public: No such file or directory >>> debug1: identity file /home//.ssh/id_dsa-cert type -1 >>> debug1: key_load_public: No such file or directory >>> debug1: identity file /home//.ssh/id_ecdsa type -1 >>> debug1: key_load_public: No such file or directory >>> debug1: identity file /home//.ssh/id_ecdsa-cert type -1 >>> debug1: key_load_public: No such file or directory >>> debug1: identity file /home//.ssh/id_ed25519 type -1 >>> debug1: key_load_public: No such file or directory >>> debug1: identity file /home//.ssh/id_ed25519-cert type -1 >>> debug1: Enabling compatibility mode for protocol 2.0 >>> debug1: Local version string SSH-2.0-OpenSSH_7.2p2 Ubuntu-4ubuntu2.1 >>> debug1: Remote protocol version 2.0, remote software version >>> dropbear_2016.74 >>> debug1: no match: dropbear_2016.74 >>> debug1: Authenticating to 172.17.152.20:22 as 'root' >>> debug1: SSH2_MSG_KEXINIT sent >>> debug1: SSH2_MSG_KEXINIT received >>> debug1: kex: algorithm: curve25519-sha...@libssh.org >>> debug1: kex: host key algorithm: ssh-dss >>> debug1: kex: server->client cipher: aes128-ctr MAC: hmac-sha2-256 >>> compression: none >>> debug1: kex: client->server cipher: aes128-ctr MAC: hmac-sha2-256 >>> compression: none >>> debug1: expecting SSH2_MSG_KEX_ECDH_REPLY >>> Connection closed by 172.17.152.20 port 22 >>> >>> ---------------------------------------- from dropbear >>> ------------------------------------------------------------ >>> --------------- >>> [root@172.17.152.20: ]# dropbear -v -F >>> TRACE (2934) 0.000000: enter buf_get_rsa_priv_key >>> TRACE (2934) 0.000702: enter buf_get_rsa_pub_key >>> TRACE (2934) 0.003142: leave buf_get_rsa_pub_key: success >>> TRACE (2934) 0.006667: leave buf_get_rsa_priv_key >>> TRACE (2934) 0.007364: leave loadhostkey >>> TRACE (2934) 0.008475: enter buf_get_dss_pub_key >>> TRACE (2934) 0.029568: leave buf_get_dss_pub_key: success >>> TRACE (2934) 0.030491: leave loadhostkey >>> TRACE (2934) 0.031491: enter buf_get_ecdsa_priv_key >>> TRACE (2934) 0.032079: enter buf_get_ecc_raw_pubkey >>> TRACE (2934) 0.037565: leave buf_get_ecdsa_pub_key >>> TRACE (2934) 0.038492: leave loadhostkey >>> TRACE (2934) 0.049830: Disabling key type 2 >>> TRACE (2934) 0.050450: Disabling key type 3 >>> TRACE (2934) 0.110221: listensockets: 1 to try >>> TRACE (2934) 0.111137: listening on ':22' >>> TRACE (2934) 0.111844: enter dropbear_listen >>> TRACE (2934) 0.112368: dropbear_listen: all interfaces >>> TRACE (2934) 0.113916: bind(22) failed >>> TRACE (2934) 0.114629: leave dropbear_listen: success, 1 socks bound >>> TRACE (2934) 0.115578: set_listen_fast_open failed for socket 3: >>> Protocol not available >>> [2934] Jan 01 00:16:07 Not backgrounding >>> [2934] Jan 01 00:16:12 Child connection from 172.17.163.3:42180 >>> TRACE (2934) 5.057261: enter session_init >>> TRACE (2934) 5.058028: setnonblocking: 5 >>> TRACE (2934) 5.058726: leave setnonblocking >>> TRACE (2934) 5.059736: setnonblocking: 5 >>> TRACE (2934) 5.060404: leave setnonblocking >>> TRACE (2934) 5.060983: update_channel_prio >>> TRACE (2934) 5.061525: update_channel_prio: not any >>> TRACE (2934) 5.062037: Dropbear priority transitioning 10 -> 11 >>> TRACE (2934) 5.062814: setnonblocking: 3 >>> TRACE (2934) 5.063414: leave setnonblocking >>> TRACE (2934) 5.063894: setnonblocking: 6 >>> TRACE (2934) 5.064461: leave setnonblocking >>> TRACE (2934) 5.065835: leave session_init >>> TRACE (2934) 5.066793: kexinitialise() >>> TRACE (2934) 5.067877: DATAALLOWED=0 >>> TRACE (2934) 5.068411: -> KEXINIT >>> TRACE (2934) 5.069399: enter set_connect_fds >>> TRACE (2934) 5.070012: maybe_empty_reply_queue - no data allowed >>> TRACE (2934) 5.070558: enter handle_connect_fds >>> TRACE (2934) 5.071036: leave handle_connect_fds - end iter >>> TRACE (2934) 5.071895: empty queue dequeing >>> TRACE (2934) 5.073045: enter set_connect_fds >>> TRACE (2934) 5.073657: enter ident_readln >>> TRACE (2934) 5.077698: leave ident_readln: return 40 >>> TRACE (2934) 5.078328: remoteident: SSH-2.0-OpenSSH_7.2p2 >>> Ubuntu-4ubuntu2.1 >>> TRACE (2934) 5.079270: maybe_empty_reply_queue - no data allowed >>> TRACE (2934) 5.079801: enter handle_connect_fds >>> TRACE (2934) 5.080287: leave handle_connect_fds - end iter >>> TRACE (2934) 5.080824: enter set_connect_fds >>> TRACE (2934) 5.081611: process_packet: packet type = 20, len 1048 >>> TRACE (2934) 5.082330: got expected packet 20 during kexinit >>> TRACE (2934) 5.082944: <- KEXINIT >>> TRACE (2934) 5.083440: enter recv_msg_kexinit >>> TRACE (2934) 5.084130: buf_match_algo: curve25519-sha...@libssh.org,e >>> cdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diff >>> ie-hellman-group-exchange-sha256,diffie-hellman-group-exchan >>> ge-sha1,diffie-hellman-group14-sha1,ext-info-c >>> TRACE (2934) 5.084896: kexguess2 1 >>> TRACE (2934) 5.085457: kex algo curve25519-sha...@libssh.org >>> TRACE (2934) 5.086025: buf_match_algo: ssh-dss >>> TRACE (2934) 5.086588: hostkey algo ssh-dss >>> TRACE (2934) 5.087174: buf_match_algo: chacha20-poly1...@openssh.com, >>> aes128-ctr,aes192-ctr,aes256-ctr,aes128-...@openssh.com,aes2 >>> 56-...@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc,3des-cbc >>> TRACE (2934) 5.087844: enc c2s is aes128-ctr >>> TRACE (2934) 5.088424: buf_match_algo: chacha20-poly1...@openssh.com, >>> aes128-ctr,aes192-ctr,aes256-ctr,aes128-...@openssh.com,aes2 >>> 56-...@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc,3des-cbc >>> TRACE (2934) 5.089247: enc s2c is aes128-ctr >>> TRACE (2934) 5.089838: buf_match_algo: umac-64-...@openssh.com,umac-1 >>> 28-...@openssh.com,hmac-sha2-256-...@openssh.com,hmac-sha2-5 >>> 12-...@openssh.com,hmac-sha1-...@openssh.com,umac...@openssh.com, >>> umac-...@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 >>> TRACE (2934) 5.090572: hash c2s is hmac-sha2-256 >>> TRACE (2934) 5.091158: buf_match_algo: umac-64-...@openssh.com,umac-1 >>> 28-...@openssh.com,hmac-sha2-256-...@openssh.com,hmac-sha2-5 >>> 12-...@openssh.com,hmac-sha1-...@openssh.com,umac...@openssh.com, >>> umac-...@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 >>> TRACE (2934) 5.091877: hash s2c is hmac-sha2-256 >>> TRACE (2934) 5.092456: buf_match_algo: none,z...@openssh.com,zlib >>> TRACE (2934) 5.093025: hash c2s is none >>> TRACE (2934) 5.093598: buf_match_algo: none,z...@openssh.com,zlib >>> TRACE (2934) 5.094179: hash s2c is none >>> TRACE (2934) 5.094836: leave recv_msg_kexinit >>> TRACE (2934) 5.095394: maybe_empty_reply_queue - no data allowed >>> TRACE (2934) 5.095885: enter handle_connect_fds >>> TRACE (2934) 5.096379: leave handle_connect_fds - end iter >>> TRACE (2934) 5.096902: enter set_connect_fds >>> TRACE (2934) 5.097611: process_packet: packet type = 30, len 42 >>> TRACE (2934) 5.098344: got expected packet 30 during kexinit >>> TRACE (2934) 5.099060: enter recv_msg_kexdh_init >>> TRACE (2934) 5.099589: enter send_msg_kexdh_reply >>> TRACE (2934) 5.234566: enter buf_put_dss_sign >>> TRACE (2934) 5.336603: leave buf_put_dss_sign >>> TRACE (2934) 5.337367: leave send_msg_kexdh_reply >>> TRACE (2934) 5.337903: enter send_msg_newkeys >>> TRACE (2934) 5.338527: enter gen_new_keys >>> Aiee, segfault! You should probably report this as a bug to the developer >>> [root@172.17.152.20: ]# >>> >>> >>> ---------------------------------------- from client >>> ------------------------------------------------------------ >>> --------------- >>> $ ssh -v -o HostKeyAlgorithms=ssh-rsa root@172.17.152.20 >>> OpenSSH_7.2p2 Ubuntu-4ubuntu2.1, OpenSSL 1.0.2g 1 Mar 2016 >>> debug1: Reading configuration data /etc/ssh/ssh_config >>> debug1: /etc/ssh/ssh_config line 19: Applying options for * >>> debug1: Connecting to 172.17.152.20 [172.17.152.20] port 22. >>> debug1: Connection established. >>> debug1: key_load_public: No such file or directory >>> debug1: identity file /home//.ssh/id_rsa type -1 >>> debug1: key_load_public: No such file or directory >>> debug1: identity file /home//.ssh/id_rsa-cert type -1 >>> debug1: key_load_public: No such file or directory >>> debug1: identity file /home//.ssh/id_dsa type -1 >>> debug1: key_load_public: No such file or directory >>> debug1: identity file /home//.ssh/id_dsa-cert type -1 >>> debug1: key_load_public: No such file or directory >>> debug1: identity file /home//.ssh/id_ecdsa type -1 >>> debug1: key_load_public: No such file or directory >>> debug1: identity file /home//.ssh/id_ecdsa-cert type -1 >>> debug1: key_load_public: No such file or directory >>> debug1: identity file /home//.ssh/id_ed25519 type -1 >>> debug1: key_load_public: No such file or directory >>> debug1: identity file /home//.ssh/id_ed25519-cert type -1 >>> debug1: Enabling compatibility mode for protocol 2.0 >>> debug1: Local version string SSH-2.0-OpenSSH_7.2p2 Ubuntu-4ubuntu2.1 >>> debug1: Remote protocol version 2.0, remote software version >>> dropbear_2016.74 >>> debug1: no match: dropbear_2016.74 >>> debug1: Authenticating to 172.17.152.20:22 as 'root' >>> debug1: SSH2_MSG_KEXINIT sent >>> debug1: SSH2_MSG_KEXINIT received >>> debug1: kex: algorithm: curve25519-sha...@libssh.org >>> debug1: kex: host key algorithm: ssh-rsa >>> debug1: kex: server->client cipher: aes128-ctr MAC: hmac-sha2-256 >>> compression: none >>> debug1: kex: client->server cipher: aes128-ctr MAC: hmac-sha2-256 >>> compression: none >>> debug1: expecting SSH2_MSG_KEX_ECDH_REPLY >>> Connection closed by 172.17.152.20 port 22 >>> >>> ---------------------------------------- from dropbear >>> ------------------------------------------------------------ >>> --------------- >>> [root@172.17.152.20: ]# dropbear -v -F >>> TRACE (3066) 0.000000: enter buf_get_rsa_priv_key >>> TRACE (3066) 0.000692: enter buf_get_rsa_pub_key >>> TRACE (3066) 0.003467: leave buf_get_rsa_pub_key: success >>> TRACE (3066) 0.007054: leave buf_get_rsa_priv_key >>> TRACE (3066) 0.007749: leave loadhostkey >>> TRACE (3066) 0.008958: enter buf_get_dss_pub_key >>> TRACE (3066) 0.011581: leave buf_get_dss_pub_key: success >>> TRACE (3066) 0.012362: leave loadhostkey >>> TRACE (3066) 0.013428: enter buf_get_ecdsa_priv_key >>> TRACE (3066) 0.014002: enter buf_get_ecc_raw_pubkey >>> TRACE (3066) 0.019249: leave buf_get_ecdsa_pub_key >>> TRACE (3066) 0.020103: leave loadhostkey >>> TRACE (3066) 0.020569: Disabling key type 2 >>> TRACE (3066) 0.021071: Disabling key type 3 >>> TRACE (3066) 0.059965: listensockets: 1 to try >>> TRACE (3066) 0.061012: listening on ':22' >>> TRACE (3066) 0.061761: enter dropbear_listen >>> TRACE (3066) 0.062337: dropbear_listen: all interfaces >>> TRACE (3066) 0.064058: bind(22) failed >>> TRACE (3066) 0.064837: leave dropbear_listen: success, 1 socks bound >>> TRACE (3066) 0.065962: set_listen_fast_open failed for socket 3: >>> Protocol not available >>> [3066] Jan 01 00:18:21 Not backgrounding >>> [3066] Jan 01 00:18:23 Child connection from 172.17.163.3:42554 >>> TRACE (3066) 2.443367: enter session_init >>> TRACE (3066) 2.444121: setnonblocking: 5 >>> TRACE (3066) 2.444770: leave setnonblocking >>> TRACE (3066) 2.445351: setnonblocking: 5 >>> TRACE (3066) 2.445970: leave setnonblocking >>> TRACE (3066) 2.446569: update_channel_prio >>> TRACE (3066) 2.447120: update_channel_prio: not any >>> TRACE (3066) 2.447636: Dropbear priority transitioning 10 -> 11 >>> TRACE (3066) 2.448406: setnonblocking: 3 >>> TRACE (3066) 2.449024: leave setnonblocking >>> TRACE (3066) 2.449518: setnonblocking: 6 >>> TRACE (3066) 2.450104: leave setnonblocking >>> TRACE (3066) 2.451526: leave session_init >>> TRACE (3066) 2.452468: kexinitialise() >>> TRACE (3066) 2.453758: DATAALLOWED=0 >>> TRACE (3066) 2.454296: -> KEXINIT >>> TRACE (3066) 2.454825: enter set_connect_fds >>> TRACE (3066) 2.455418: maybe_empty_reply_queue - no data allowed >>> TRACE (3066) 2.455931: enter handle_connect_fds >>> TRACE (3066) 2.456436: leave handle_connect_fds - end iter >>> TRACE (3066) 2.457321: empty queue dequeing >>> TRACE (3066) 2.458488: enter set_connect_fds >>> TRACE (3066) 2.459096: enter ident_readln >>> TRACE (3066) 2.463414: leave ident_readln: return 40 >>> TRACE (3066) 2.464057: remoteident: SSH-2.0-OpenSSH_7.2p2 >>> Ubuntu-4ubuntu2.1 >>> TRACE (3066) 2.464651: maybe_empty_reply_queue - no data allowed >>> TRACE (3066) 2.465149: enter handle_connect_fds >>> TRACE (3066) 2.465624: leave handle_connect_fds - end iter >>> TRACE (3066) 2.466161: enter set_connect_fds >>> TRACE (3066) 2.466961: process_packet: packet type = 20, len 1048 >>> TRACE (3066) 2.467688: got expected packet 20 during kexinit >>> TRACE (3066) 2.468301: <- KEXINIT >>> TRACE (3066) 2.468759: enter recv_msg_kexinit >>> TRACE (3066) 2.469425: buf_match_algo: curve25519-sha...@libssh.org,e >>> cdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diff >>> ie-hellman-group-exchange-sha256,diffie-hellman-group-exchan >>> ge-sha1,diffie-hellman-group14-sha1,ext-info-c >>> TRACE (3066) 2.470150: kexguess2 1 >>> TRACE (3066) 2.470744: kex algo curve25519-sha...@libssh.org >>> TRACE (3066) 2.471337: buf_match_algo: ssh-rsa >>> TRACE (3066) 2.471917: hostkey algo ssh-rsa >>> TRACE (3066) 2.472489: buf_match_algo: chacha20-poly1...@openssh.com, >>> aes128-ctr,aes192-ctr,aes256-ctr,aes128-...@openssh.com,aes2 >>> 56-...@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc,3des-cbc >>> TRACE (3066) 2.473777: enc c2s is aes128-ctr >>> TRACE (3066) 2.474389: buf_match_algo: chacha20-poly1...@openssh.com, >>> aes128-ctr,aes192-ctr,aes256-ctr,aes128-...@openssh.com,aes2 >>> 56-...@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc,3des-cbc >>> TRACE (3066) 2.475073: enc s2c is aes128-ctr >>> TRACE (3066) 2.475668: buf_match_algo: umac-64-...@openssh.com,umac-1 >>> 28-...@openssh.com,hmac-sha2-256-...@openssh.com,hmac-sha2-5 >>> 12-...@openssh.com,hmac-sha1-...@openssh.com,umac...@openssh.com, >>> umac-...@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 >>> TRACE (3066) 2.476384: hash c2s is hmac-sha2-256 >>> TRACE (3066) 2.476967: buf_match_algo: umac-64-...@openssh.com,umac-1 >>> 28-...@openssh.com,hmac-sha2-256-...@openssh.com,hmac-sha2-5 >>> 12-...@openssh.com,hmac-sha1-...@openssh.com,umac...@openssh.com, >>> umac-...@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 >>> TRACE (3066) 2.477690: hash s2c is hmac-sha2-256 >>> TRACE (3066) 2.478301: buf_match_algo: none,z...@openssh.com,zlib >>> TRACE (3066) 2.478884: hash c2s is none >>> TRACE (3066) 2.479439: buf_match_algo: none,z...@openssh.com,zlib >>> TRACE (3066) 2.480033: hash s2c is none >>> TRACE (3066) 2.480702: leave recv_msg_kexinit >>> TRACE (3066) 2.481229: maybe_empty_reply_queue - no data allowed >>> TRACE (3066) 2.481743: enter handle_connect_fds >>> TRACE (3066) 2.482215: leave handle_connect_fds - end iter >>> TRACE (3066) 2.482777: enter set_connect_fds >>> TRACE (3066) 2.483639: process_packet: packet type = 30, len 42 >>> TRACE (3066) 2.484336: got expected packet 30 during kexinit >>> TRACE (3066) 2.484948: enter recv_msg_kexdh_init >>> TRACE (3066) 2.485459: enter send_msg_kexdh_reply >>> TRACE (3066) 2.486015: enter buf_put_rsa_pub_key >>> TRACE (3066) 2.492135: leave buf_put_rsa_pub_key >>> TRACE (3066) 2.596695: enter buf_put_rsa_pub_key >>> TRACE (3066) 2.602879: leave buf_put_rsa_pub_key >>> TRACE (3066) 2.606368: enter buf_put_rsa_sign >>> Aiee, segfault! You should probably report this as a bug to the developer >>> >>> >>> Please advise how to fix the problem in Dropbear. >>> >>> Please let me know if additional information is needed. >>> >>> Thank you, >>> Konstantin Lazarev. >>> >>> >>> >> > >
