/*
* Run "gpg" to see if the payload matches the detached signature.
* gpg_output, when set, receives the diagnostic output from GPG.
* gpg_status, when set, receives the status output from GPG.
*/
int verify_signed_buffer(const char *payload, size_t payload_size,
const char *signature, size_t signature_size,
struct strbuf *gpg_output, struct strbuf *gpg_status)
{
struct child_process gpg = CHILD_PROCESS_INIT;
const char *args_gpg[] = {NULL, "--status-fd=1", "--verify", "FILE", "-", NULL};
char path[PATH_MAX];
int fd, ret;
struct strbuf buf = STRBUF_INIT;
struct strbuf *pbuf = &buf;
args_gpg[0] = gpg_program;
fd = git_mkstemp(path, PATH_MAX, ".git_vtag_tmpXXXXXX");
if (fd < 0)
return error(_("could not create temporary file '%s': %s"),
path, strerror(errno));
if (write_in_full(fd, signature, signature_size) < 0)
return error(_("failed writing detached signature to '%s': %s"),
path, strerror(errno));
close(fd);
gpg.argv = args_gpg;
gpg.in = -1;
gpg.out = -1;
if (gpg_output)
gpg.err = -1;
args_gpg[3] = path;
if (start_command(&gpg)) {
unlink(path);
return error(_("could not run gpg."));
}
sigchain_push(SIGPIPE, SIG_IGN);
write_in_full(gpg.in, payload, payload_size);
close(gpg.in);
if (gpg_output) {
strbuf_read(gpg_output, gpg.err, 0);
close(gpg.err);
}
if (gpg_status)
pbuf = gpg_status;
strbuf_read(pbuf, gpg.out, 0);
close(gpg.out);
ret = finish_command(&gpg);
sigchain_pop(SIGPIPE);
unlink_or_warn(path);
ret |= !strstr(pbuf->buf, "\n[GNUPG:] GOODSIG ");
strbuf_release(&buf); /* no matter it was used or not */
return ret;
}
static int run_gpg_verify(const char *buf, unsigned long size, int verbose)
{
struct child_process gpg;
const char *args_gpg[] = {"gpg", "--verify", "FILE", "-", NULL};
char path[PATH_MAX], *eol;
size_t len;
int fd, ret;
fd = git_mkstemp(path, PATH_MAX, ".git_vtag_tmpXXXXXX");
if (fd < 0)
return error("could not create temporary file '%s': %s",
path, strerror(errno));
if (write_in_full(fd, buf, size) < 0)
return error("failed writing temporary file '%s': %s",
path, strerror(errno));
close(fd);
/* find the length without signature */
len = 0;
while (len < size && prefixcmp(buf + len, PGP_SIGNATURE)) {
eol = memchr(buf + len, '\n', size - len);
len += eol ? eol - (buf + len) + 1 : size - len;
}
if (verbose)
write_in_full(1, buf, len);
memset(&gpg, 0, sizeof(gpg));
gpg.argv = args_gpg;
gpg.in = -1;
args_gpg[2] = path;
if (start_command(&gpg)) {
unlink(path);
return error("could not run gpg.");
}
write_in_full(gpg.in, buf, len);
close(gpg.in);
ret = finish_command(&gpg);
unlink(path);
return ret;
}
