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Introduce the Bugs control panel, for overriding PuTTY's server

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version number checks to determine the presence or absence of server
bugs.

[originally from svn r1936]
This commit is contained in:
Simon Tatham
2002-09-08 13:28:38 +00:00
parent f9f2042ca2
commit 3391745d2d
7 changed files with 387 additions and 42 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
ssh.c
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@ -1660,9 +1660,11 @@ static void ssh_detect_bugs(char *vstring)
ssh_remote_bugs = 0;
if (!strcmp(imp, "1.2.18") || !strcmp(imp, "1.2.19") ||
!strcmp(imp, "1.2.20") || !strcmp(imp, "1.2.21") ||
!strcmp(imp, "1.2.22") || !strcmp(imp, "Cisco-1.25")) {
if (cfg.sshbug_ignore1 == BUG_ON ||
(cfg.sshbug_ignore1 == BUG_AUTO &&
(!strcmp(imp, "1.2.18") || !strcmp(imp, "1.2.19") ||
!strcmp(imp, "1.2.20") || !strcmp(imp, "1.2.21") ||
!strcmp(imp, "1.2.22") || !strcmp(imp, "Cisco-1.25")))) {
/*
* These versions don't support SSH1_MSG_IGNORE, so we have
* to use a different defence against password length
@ -1672,7 +1674,9 @@ static void ssh_detect_bugs(char *vstring)
logevent("We believe remote version has SSH1 ignore bug");
}
if (!strcmp(imp, "Cisco-1.25")) {
if (cfg.sshbug_plainpw1 == BUG_ON ||
(cfg.sshbug_plainpw1 == BUG_AUTO &&
(!strcmp(imp, "Cisco-1.25")))) {
/*
* These versions need a plain password sent; they can't
* handle having a null and a random length of data after
@ -1682,7 +1686,9 @@ static void ssh_detect_bugs(char *vstring)
logevent("We believe remote version needs a plain SSH1 password");
}
if (!strcmp(imp, "Cisco-1.25")) {
if (cfg.sshbug_rsa1 == BUG_ON ||
(cfg.sshbug_rsa1 == BUG_AUTO &&
(!strcmp(imp, "Cisco-1.25")))) {
/*
* These versions apparently have no clue whatever about
* RSA authentication and will panic and die if they see
@ -1692,9 +1698,11 @@ static void ssh_detect_bugs(char *vstring)
logevent("We believe remote version can't handle RSA authentication");
}
if (!strncmp(imp, "2.1.0", 5) || !strncmp(imp, "2.0.", 4) ||
!strncmp(imp, "2.2.0", 5) || !strncmp(imp, "2.3.0", 5) ||
!strncmp(imp, "2.1 ", 4)) {
if (cfg.sshbug_hmac2 == BUG_ON ||
(cfg.sshbug_hmac2 == BUG_AUTO &&
(!strncmp(imp, "2.1.0", 5) || !strncmp(imp, "2.0.", 4) ||
!strncmp(imp, "2.2.0", 5) || !strncmp(imp, "2.3.0", 5) ||
!strncmp(imp, "2.1 ", 4)))) {
/*
* These versions have the HMAC bug.
*/
@ -1702,7 +1710,9 @@ static void ssh_detect_bugs(char *vstring)
logevent("We believe remote version has SSH2 HMAC bug");
}
if (!strncmp(imp, "2.0.", 4)) {
if (cfg.sshbug_derivekey2 == BUG_ON ||
(cfg.sshbug_derivekey2 == BUG_AUTO &&
(!strncmp(imp, "2.0.", 4)))) {
/*
* These versions have the key-derivation bug (failing to
* include the literal shared secret in the hashes that
@ -1712,8 +1722,10 @@ static void ssh_detect_bugs(char *vstring)
logevent("We believe remote version has SSH2 key-derivation bug");
}
if ((!strncmp(imp, "OpenSSH_2.", 10) && imp[10]>='5' && imp[10]<='9') ||
(!strncmp(imp, "OpenSSH_3.", 10) && imp[10]>='0' && imp[10]<='2')) {
if (cfg.sshbug_rsapad2 == BUG_ON ||
(cfg.sshbug_rsapad2 == BUG_AUTO &&
((!strncmp(imp, "OpenSSH_2.", 10) && imp[10]>='5' && imp[10]<='9') ||
(!strncmp(imp, "OpenSSH_3.", 10) && imp[10]>='0' && imp[10]<='2')))){
/*
* These versions have the SSH2 RSA padding bug.
*/
@ -5787,7 +5799,8 @@ static void ssh_special(Telnet_Special code)
if (ssh_state == SSH_STATE_CLOSED
|| ssh_state == SSH_STATE_PREPACKET) return;
if (ssh_version == 1) {
send_packet(SSH1_MSG_IGNORE, PKT_STR, "", PKT_END);
if (!(ssh_remote_bugs & BUG_CHOKES_ON_SSH1_IGNORE))
send_packet(SSH1_MSG_IGNORE, PKT_STR, "", PKT_END);
} else {
ssh2_pkt_init(SSH2_MSG_IGNORE);
ssh2_pkt_addstring_start();