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Give a better error message if a PuTTY private key file has a version

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number we don't understand. It's nicer to report 'format too new' than
'not a PuTTY key file'.

[originally from svn r9763]
This commit is contained in:
Simon Tatham
2013-02-22 21:39:02 +00:00
parent 8f3cc4a9bf
commit 40ce043a97
2 changed files with 16 additions and 6 deletions
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10
sshpubk.c
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@ -647,6 +647,11 @@ struct ssh2_userkey *ssh2_load_userkey(const Filename *filename,
/* this is an old key file; warn and then continue */
old_keyfile_warning();
old_fmt = 1;
} else if (0 == strncmp(header, "PuTTY-User-Key-File-", 20)) {
/* this is a key file FROM THE FUTURE; refuse it, but with a
* more specific error message than the generic one below */
error = "PuTTY key format too new";
goto error;
} else {
error = "not a PuTTY SSH-2 private key";
goto error;
@ -891,7 +896,10 @@ unsigned char *ssh2_userkey_loadpub(const Filename *filename, char **algorithm,
if (!read_header(fp, header)
|| (0 != strcmp(header, "PuTTY-User-Key-File-2") &&
0 != strcmp(header, "PuTTY-User-Key-File-1"))) {
error = "not a PuTTY SSH-2 private key";
if (0 == strncmp(header, "PuTTY-User-Key-File-", 20))
error = "PuTTY key format too new";
else
error = "not a PuTTY SSH-2 private key";
goto error;
}
error = "file format error";