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gpg-interface: trim CR from ssh-keygen 

We need to trim \r from the output of 'ssh-keygen -Y find-principals' on
Windows, or we end up calling 'ssh-keygen -Y verify' with a bogus signer
identity. ssh-keygen.c:2841 contains a call to puts(3), which confirms
this hypothesis. Signature verification passes with the fix.

Helped-by: Pedro Martelletto <pedro@yubico.com>
Signed-off-by: Fabian Stelzer <fs@gigacodes.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Fabian Stelzer 2022-01-07 10:07:35 +01:00 committed by Junio C Hamano
parent e83ba647f7
commit caeef01ea7
1 changed files with 23 additions and 9 deletions
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32
gpg-interface.c
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@ -433,7 +433,6 @@ static int verify_ssh_signed_buffer(struct signature_check *sigc,
struct tempfile *buffer_file;
int ret = -1;
const char *line;
size_t trust_size;
char *principal;
struct strbuf ssh_principals_out = STRBUF_INIT;
struct strbuf ssh_principals_err = STRBUF_INIT;
@ -502,15 +501,30 @@ static int verify_ssh_signed_buffer(struct signature_check *sigc,
ret = -1;
} else {
/* Check every principal we found (one per line) */
for (line = ssh_principals_out.buf; *line;
line = strchrnul(line + 1, '\n')) {
while (*line == '\n')
line++;
if (!*line)
break;
const char *next;
for (line = ssh_principals_out.buf;
*line;
line = next) {
const char *end_of_text;
trust_size = strcspn(line, "\n");
principal = xmemdupz(line, trust_size);
next = end_of_text = strchrnul(line, '\n');
/* Did we find a LF, and did we have CR before it? */
if (*end_of_text &&
line < end_of_text &&
end_of_text[-1] == '\r')
end_of_text--;
/* Unless we hit NUL, skip over the LF we found */
if (*next)
next++;
/* Not all lines are data. Skip empty ones */
if (line == end_of_text)
continue;
/* We now know we have an non-empty line. Process it */
principal = xmemdupz(line, end_of_text - line);
child_process_init(&ssh_keygen);
strbuf_release(&ssh_keygen_out);