#include "tempfile.h"
static char *configured_signing_key;
+static enum signature_trust_level configured_min_trust_level = TRUST_UNDEFINED;
+
struct gpg_format {
const char *name;
const char *program;
#define GPG_STATUS_UID (1<<2)
/* The status includes key fingerprints */
#define GPG_STATUS_FINGERPRINT (1<<3)
+/* The status includes trust level */
+#define GPG_STATUS_TRUST_LEVEL (1<<4)
/* Short-hand for standard exclusive *SIG status with keyid & UID */
#define GPG_STATUS_STDSIG (GPG_STATUS_EXCLUSIVE|GPG_STATUS_KEYID|GPG_STATUS_UID)
} sigcheck_gpg_status[] = {
{ 'G', "GOODSIG ", GPG_STATUS_STDSIG },
{ 'B', "BADSIG ", GPG_STATUS_STDSIG },
- { 'U', "TRUST_NEVER", 0 },
- { 'U', "TRUST_UNDEFINED", 0 },
{ 'E', "ERRSIG ", GPG_STATUS_EXCLUSIVE|GPG_STATUS_KEYID },
{ 'X', "EXPSIG ", GPG_STATUS_STDSIG },
{ 'Y', "EXPKEYSIG ", GPG_STATUS_STDSIG },
{ 'R', "REVKEYSIG ", GPG_STATUS_STDSIG },
{ 0, "VALIDSIG ", GPG_STATUS_FINGERPRINT },
+ { 0, "TRUST_", GPG_STATUS_TRUST_LEVEL },
};
+static struct {
+ const char *key;
+ enum signature_trust_level value;
+} sigcheck_gpg_trust_level[] = {
+ { "UNDEFINED", TRUST_UNDEFINED },
+ { "NEVER", TRUST_NEVER },
+ { "MARGINAL", TRUST_MARGINAL },
+ { "FULLY", TRUST_FULLY },
+ { "ULTIMATE", TRUST_ULTIMATE },
+};
+
+static void replace_cstring(char **field, const char *line, const char *next)
+{
+ free(*field);
+
+ if (line && next)
+ *field = xmemdupz(line, next - line);
+ else
+ *field = NULL;
+}
+
+static int parse_gpg_trust_level(const char *level,
+ enum signature_trust_level *res)
+{
+ size_t i;
+
+ for (i = 0; i < ARRAY_SIZE(sigcheck_gpg_trust_level); i++) {
+ if (!strcmp(sigcheck_gpg_trust_level[i].key, level)) {
+ *res = sigcheck_gpg_trust_level[i].value;
+ return 0;
+ }
+ }
+ return 1;
+}
+
static void parse_gpg_output(struct signature_check *sigc)
{
const char *buf = sigc->gpg_status;
for (line = buf; *line; line = strchrnul(line+1, '\n')) {
while (*line == '\n')
line++;
+ if (!*line)
+ break;
+
/* Skip lines that don't start with GNUPG status */
if (!skip_prefix(line, "[GNUPG:] ", &line))
continue;
/* Iterate over all search strings */
for (i = 0; i < ARRAY_SIZE(sigcheck_gpg_status); i++) {
if (skip_prefix(line, sigcheck_gpg_status[i].check, &line)) {
+ /*
+ * GOODSIG, BADSIG etc. can occur only once for
+ * each signature. Therefore, if we had more
+ * than one then we're dealing with multiple
+ * signatures. We don't support them
+ * currently, and they're rather hard to
+ * create, so something is likely fishy and we
+ * should reject them altogether.
+ */
if (sigcheck_gpg_status[i].flags & GPG_STATUS_EXCLUSIVE) {
if (seen_exclusive_status++)
- goto found_duplicate_status;
+ goto error;
}
if (sigcheck_gpg_status[i].result)
/* Do we have key information? */
if (sigcheck_gpg_status[i].flags & GPG_STATUS_KEYID) {
next = strchrnul(line, ' ');
- free(sigc->key);
- sigc->key = xmemdupz(line, next - line);
+ replace_cstring(&sigc->key, line, next);
/* Do we have signer information? */
if (*next && (sigcheck_gpg_status[i].flags & GPG_STATUS_UID)) {
line = next + 1;
next = strchrnul(line, '\n');
- free(sigc->signer);
- sigc->signer = xmemdupz(line, next - line);
+ replace_cstring(&sigc->signer, line, next);
}
}
+
+ /* Do we have trust level? */
+ if (sigcheck_gpg_status[i].flags & GPG_STATUS_TRUST_LEVEL) {
+ /*
+ * GPG v1 and v2 differs in how the
+ * TRUST_ lines are written. Some
+ * trust lines contain no additional
+ * space-separated information for v1.
+ */
+ size_t trust_size = strcspn(line, " \n");
+ char *trust = xmemdupz(line, trust_size);
+
+ if (parse_gpg_trust_level(trust, &sigc->trust_level)) {
+ free(trust);
+ goto error;
+ }
+ free(trust);
+ }
+
/* Do we have fingerprint? */
if (sigcheck_gpg_status[i].flags & GPG_STATUS_FINGERPRINT) {
- next = strchrnul(line, ' ');
- free(sigc->fingerprint);
- sigc->fingerprint = xmemdupz(line, next - line);
+ const char *limit;
+ char **field;
- /* Skip interim fields */
+ next = strchrnul(line, ' ');
+ replace_cstring(&sigc->fingerprint, line, next);
+
+ /*
+ * Skip interim fields. The search is
+ * limited to the same line since only
+ * OpenPGP signatures has a field with
+ * the primary fingerprint.
+ */
+ limit = strchrnul(line, '\n');
for (j = 9; j > 0; j--) {
- if (!*next)
+ if (!*next || limit <= next)
break;
line = next + 1;
next = strchrnul(line, ' ');
}
- next = strchrnul(line, '\n');
- free(sigc->primary_key_fingerprint);
- sigc->primary_key_fingerprint = xmemdupz(line, next - line);
+ field = &sigc->primary_key_fingerprint;
+ if (!j) {
+ next = strchrnul(line, '\n');
+ replace_cstring(field, line, next);
+ } else {
+ replace_cstring(field, NULL, NULL);
+ }
}
break;
}
return;
-found_duplicate_status:
- /*
- * GOODSIG, BADSIG etc. can occur only once for each signature.
- * Therefore, if we had more than one then we're dealing with multiple
- * signatures. We don't support them currently, and they're rather
- * hard to create, so something is likely fishy and we should reject
- * them altogether.
- */
+error:
sigc->result = 'E';
/* Clear partial data to avoid confusion */
FREE_AND_NULL(sigc->primary_key_fingerprint);
int status;
sigc->result = 'N';
+ sigc->trust_level = -1;
status = verify_signed_buffer(payload, plen, signature, slen,
&gpg_output, &gpg_status);
sigc->gpg_output = strbuf_detach(&gpg_output, NULL);
sigc->gpg_status = strbuf_detach(&gpg_status, NULL);
parse_gpg_output(sigc);
- status |= sigc->result != 'G' && sigc->result != 'U';
+ status |= sigc->result != 'G';
+ status |= sigc->trust_level < configured_min_trust_level;
out:
strbuf_release(&gpg_status);
{
struct gpg_format *fmt = NULL;
char *fmtname = NULL;
+ char *trust;
+ int ret;
if (!strcmp(var, "user.signingkey")) {
if (!value)
return 0;
}
+ if (!strcmp(var, "gpg.mintrustlevel")) {
+ if (!value)
+ return config_error_nonbool(var);
+
+ trust = xstrdup_toupper(value);
+ ret = parse_gpg_trust_level(trust, &configured_min_trust_level);
+ free(trust);
+
+ if (ret)
+ return error("unsupported value for %s: %s", var,
+ value);
+ return 0;
+ }
+
if (!strcmp(var, "gpg.program") || !strcmp(var, "gpg.openpgp.program"))
fmtname = "openpgp";
projects / thirdparty / git.git / blobdiff