static char *configured_signing_key;
static const char *gpg_program = "gpg";
+#define PGP_SIGNATURE "-----BEGIN PGP SIGNATURE-----"
+#define PGP_MESSAGE "-----BEGIN PGP MESSAGE-----"
+
void signature_check_clear(struct signature_check *sigc)
{
free(sigc->payload);
sigc->key = NULL;
}
+static struct {
+ char result;
+ const char *check;
+} sigcheck_gpg_status[] = {
+ { 'G', "\n[GNUPG:] GOODSIG " },
+ { 'B', "\n[GNUPG:] BADSIG " },
+ { 'U', "\n[GNUPG:] TRUST_NEVER" },
+ { 'U', "\n[GNUPG:] TRUST_UNDEFINED" },
+};
+
+void parse_gpg_output(struct signature_check *sigc)
+{
+ const char *buf = sigc->gpg_status;
+ int i;
+
+ /* Iterate over all search strings */
+ for (i = 0; i < ARRAY_SIZE(sigcheck_gpg_status); i++) {
+ const char *found, *next;
+
+ if (!skip_prefix(buf, sigcheck_gpg_status[i].check + 1, &found)) {
+ found = strstr(buf, sigcheck_gpg_status[i].check);
+ if (!found)
+ continue;
+ found += strlen(sigcheck_gpg_status[i].check);
+ }
+ sigc->result = sigcheck_gpg_status[i].result;
+ /* The trust messages are not followed by key/signer information */
+ if (sigc->result != 'U') {
+ sigc->key = xmemdupz(found, 16);
+ found += 17;
+ next = strchrnul(found, '\n');
+ sigc->signer = xmemdupz(found, next - found);
+ }
+ }
+}
+
+int check_signature(const char *payload, size_t plen, const char *signature,
+ size_t slen, struct signature_check *sigc)
+{
+ struct strbuf gpg_output = STRBUF_INIT;
+ struct strbuf gpg_status = STRBUF_INIT;
+ int status;
+
+ sigc->result = 'N';
+
+ status = verify_signed_buffer(payload, plen, signature, slen,
+ &gpg_output, &gpg_status);
+ if (status && !gpg_output.len)
+ goto out;
+ sigc->payload = xmemdupz(payload, plen);
+ sigc->gpg_output = strbuf_detach(&gpg_output, NULL);
+ sigc->gpg_status = strbuf_detach(&gpg_status, NULL);
+ parse_gpg_output(sigc);
+
+ out:
+ strbuf_release(&gpg_status);
+ strbuf_release(&gpg_output);
+
+ return sigc->result != 'G' && sigc->result != 'U';
+}
+
+void print_signature_buffer(const struct signature_check *sigc, unsigned flags)
+{
+ const char *output = flags & GPG_VERIFY_RAW ?
+ sigc->gpg_status : sigc->gpg_output;
+
+ if (flags & GPG_VERIFY_VERBOSE && sigc->payload)
+ fputs(sigc->payload, stdout);
+
+ if (output)
+ fputs(output, stderr);
+}
+
+/*
+ * Look at GPG signed content (e.g. a signed tag object), whose
+ * payload is followed by a detached signature on it. Return the
+ * offset where the embedded detached signature begins, or the end of
+ * the data when there is no such signature.
+ */
+size_t parse_signature(const char *buf, unsigned long size)
+{
+ char *eol;
+ size_t len = 0;
+ while (len < size && !starts_with(buf + len, PGP_SIGNATURE) &&
+ !starts_with(buf + len, PGP_MESSAGE)) {
+ eol = memchr(buf + len, '\n', size - len);
+ len += eol ? eol - (buf + len) + 1 : size - len;
+ }
+ return len;
+}
+
void set_signing_key(const char *key)
{
free(configured_signing_key);