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-rw-r--r--gpg-interface.c114
1 files changed, 110 insertions, 4 deletions
diff --git a/gpg-interface.c b/gpg-interface.c
index 8b0e87436b..3dc2fe397e 100644
--- a/gpg-interface.c
+++ b/gpg-interface.c
@@ -7,6 +7,114 @@
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);
+ free(sigc->gpg_output);
+ free(sigc->gpg_status);
+ free(sigc->signer);
+ free(sigc->key);
+ sigc->payload = NULL;
+ sigc->gpg_output = NULL;
+ sigc->gpg_status = NULL;
+ sigc->signer = NULL;
+ 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);
@@ -41,12 +149,11 @@ const char *get_signing_key(void)
*/
int sign_buffer(struct strbuf *buffer, struct strbuf *signature, const char *signing_key)
{
- struct child_process gpg;
+ struct child_process gpg = CHILD_PROCESS_INIT;
const char *args[4];
ssize_t len;
size_t i, j, bottom;
- memset(&gpg, 0, sizeof(gpg));
gpg.argv = args;
gpg.in = -1;
gpg.out = -1;
@@ -102,7 +209,7 @@ 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;
+ 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;
@@ -119,7 +226,6 @@ int verify_signed_buffer(const char *payload, size_t payload_size,
path, strerror(errno));
close(fd);
- memset(&gpg, 0, sizeof(gpg));
gpg.argv = args_gpg;
gpg.in = -1;
gpg.out = -1;