#include "strbuf.h"
#include "gpg-interface.h"
#include "sigchain.h"
+#include "tempfile.h"
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);
*/
int sign_buffer(struct strbuf *buffer, struct strbuf *signature, const char *signing_key)
{
- struct child_process gpg;
- const char *args[4];
- ssize_t len;
+ struct child_process gpg = CHILD_PROCESS_INIT;
+ int ret;
size_t i, j, bottom;
+ struct strbuf gpg_status = STRBUF_INIT;
- memset(&gpg, 0, sizeof(gpg));
- gpg.argv = args;
- gpg.in = -1;
- gpg.out = -1;
- args[0] = gpg_program;
- args[1] = "-bsau";
- args[2] = signing_key;
- args[3] = NULL;
+ argv_array_pushl(&gpg.args,
+ gpg_program,
+ "--status-fd=2",
+ "-bsau", signing_key,
+ NULL);
- if (start_command(&gpg))
- return error(_("could not run gpg."));
+ bottom = signature->len;
/*
* When the username signingkey is bad, program could be terminated
* because gpg exits without reading and then write gets SIGPIPE.
*/
sigchain_push(SIGPIPE, SIG_IGN);
-
- if (write_in_full(gpg.in, buffer->buf, buffer->len) != buffer->len) {
- close(gpg.in);
- close(gpg.out);
- finish_command(&gpg);
- return error(_("gpg did not accept the data"));
- }
- close(gpg.in);
-
- bottom = signature->len;
- len = strbuf_read(signature, gpg.out, 1024);
- close(gpg.out);
-
+ ret = pipe_command(&gpg, buffer->buf, buffer->len,
+ signature, 1024, &gpg_status, 0);
sigchain_pop(SIGPIPE);
- if (finish_command(&gpg) || !len || len < 0)
+ ret |= !strstr(gpg_status.buf, "\n[GNUPG:] SIG_CREATED ");
+ strbuf_release(&gpg_status);
+ if (ret)
return error(_("gpg failed to sign the data"));
/* Strip CR from the line endings, in case we are on Windows. */
/*
* 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_output, struct strbuf *gpg_status)
{
- struct child_process gpg;
- const char *args_gpg[] = {NULL, "--verify", "FILE", "-", NULL};
- char path[PATH_MAX];
+ struct child_process gpg = CHILD_PROCESS_INIT;
+ static struct tempfile temp;
int fd, ret;
+ struct strbuf buf = STRBUF_INIT;
- args_gpg[0] = gpg_program;
- fd = git_mkstemp(path, PATH_MAX, ".git_vtag_tmpXXXXXX");
+ fd = mks_tempfile_t(&temp, ".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));
+ return error_errno(_("could not create temporary file"));
+ if (write_in_full(fd, signature, signature_size) < 0) {
+ error_errno(_("failed writing detached signature to '%s'"),
+ temp.filename.buf);
+ delete_tempfile(&temp);
+ return -1;
+ }
close(fd);
- memset(&gpg, 0, sizeof(gpg));
- gpg.argv = args_gpg;
- gpg.in = -1;
- if (gpg_output)
- gpg.err = -1;
- args_gpg[2] = path;
- if (start_command(&gpg)) {
- unlink(path);
- return error("could not run gpg.");
- }
+ argv_array_pushl(&gpg.args,
+ gpg_program,
+ "--status-fd=1",
+ "--keyid-format=long",
+ "--verify", temp.filename.buf, "-",
+ NULL);
- write_in_full(gpg.in, payload, payload_size);
- close(gpg.in);
+ if (!gpg_status)
+ gpg_status = &buf;
- if (gpg_output) {
- strbuf_read(gpg_output, gpg.err, 0);
- close(gpg.err);
- }
- ret = finish_command(&gpg);
+ sigchain_push(SIGPIPE, SIG_IGN);
+ ret = pipe_command(&gpg, payload, payload_size,
+ gpg_status, 0, gpg_output, 0);
+ sigchain_pop(SIGPIPE);
+
+ delete_tempfile(&temp);
- unlink_or_warn(path);
+ ret |= !strstr(gpg_status->buf, "\n[GNUPG:] GOODSIG ");
+ strbuf_release(&buf); /* no matter it was used or not */
return ret;
}
projects / platform / upstream / git.git / blobdiff