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Exit with a message if the ssh protocol version is incompatible

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--HG--
extra : convert_revision : 5d396842815593611f0d61762440145d1fc74d5a
This commit is contained in:
Matt Johnston 2006-03-04 08:22:16 +00:00
parent a5a56874af
commit b598996497
1 changed files with 8 additions and 4 deletions
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12
common-session.c
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@ -232,10 +232,8 @@ void session_identification() {
dropbear_exit("Error writing ident string"); dropbear_exit("Error writing ident string");
} }
/* We allow up to 9 lines before the actual version string, to /* If they send more than 50 lines, something is wrong */
* account for wrappers/cruft etc. According to the spec only the client for (i = 0; i < 50; i++) {
* needs to handle this, but no harm in letting the server handle it too */
for (i = 0; i < 10; i++) {
len = ident_readln(ses.sock, linebuf, sizeof(linebuf)); len = ident_readln(ses.sock, linebuf, sizeof(linebuf));
if (len < 0 && errno != EINTR) { if (len < 0 && errno != EINTR) {
@ -259,6 +257,12 @@ void session_identification() {
memcpy(ses.remoteident, linebuf, len); memcpy(ses.remoteident, linebuf, len);
} }
/* Shall assume that 2.x will be backwards compatible. */
if (strncmp(ses.remoteident, "SSH-2.", 6) != 0
&& strncmp(ses.remoteident, "SSH-1.99-", 9) != 0) {
dropbear_exit("Incompatible remote version '%s'", ses.remoteident);
}
TRACE(("remoteident: %s", ses.remoteident)) TRACE(("remoteident: %s", ses.remoteident))
} }