verify_absent: allow filenames longer than PATH_MAX

diff --git a/gpg-interface.c b/gpg-interface.c
index ff07012726ea28daa2551966d0555d2e8efa2375..68b0c814f789f39151d380b1d318d6f80090d524 100644 (file)
--- a/gpg-interface.c
+++ b/gpg-interface.c
@@ -7,6 +7,9 @@
 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);
@@ -21,6 +24,60 @@ void signature_check_clear(struct signature_check *sigc)
        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);
+               }
+       }
+}
+
+/*
+ * 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);
@@ -55,12 +112,11 @@ 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;
@@ -116,7 +172,7 @@ 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;
@@ -133,7 +189,6 @@ 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;