mirror of
https://github.com/git/git
synced 2024-08-25 02:35:46 +00:00
![Junio C Hamano](/assets/img/avatar_default.png)
Call "gpg" using the right API when validating the signature on tags. * mg/gpg-interface-using-status: pretty: make %GK output the signing key for signed commits pretty: parse the gpg status lines rather than the output gpg_interface: allow to request status return log-tree: rely upon the check in the gpg_interface gpg-interface: check good signature in a reliable way
155 lines
3.7 KiB
C
155 lines
3.7 KiB
C
#include "cache.h"
|
|
#include "run-command.h"
|
|
#include "strbuf.h"
|
|
#include "gpg-interface.h"
|
|
#include "sigchain.h"
|
|
|
|
static char *configured_signing_key;
|
|
static const char *gpg_program = "gpg";
|
|
|
|
void set_signing_key(const char *key)
|
|
{
|
|
free(configured_signing_key);
|
|
configured_signing_key = xstrdup(key);
|
|
}
|
|
|
|
int git_gpg_config(const char *var, const char *value, void *cb)
|
|
{
|
|
if (!strcmp(var, "user.signingkey")) {
|
|
set_signing_key(value);
|
|
}
|
|
if (!strcmp(var, "gpg.program")) {
|
|
if (!value)
|
|
return config_error_nonbool(var);
|
|
gpg_program = xstrdup(value);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
const char *get_signing_key(void)
|
|
{
|
|
if (configured_signing_key)
|
|
return configured_signing_key;
|
|
return git_committer_info(IDENT_STRICT|IDENT_NO_DATE);
|
|
}
|
|
|
|
/*
|
|
* Create a detached signature for the contents of "buffer" and append
|
|
* it after "signature"; "buffer" and "signature" can be the same
|
|
* strbuf instance, which would cause the detached signature appended
|
|
* at the end.
|
|
*/
|
|
int sign_buffer(struct strbuf *buffer, struct strbuf *signature, const char *signing_key)
|
|
{
|
|
struct child_process gpg;
|
|
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;
|
|
args[0] = gpg_program;
|
|
args[1] = "-bsau";
|
|
args[2] = signing_key;
|
|
args[3] = NULL;
|
|
|
|
if (start_command(&gpg))
|
|
return error(_("could not run gpg."));
|
|
|
|
/*
|
|
* 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);
|
|
|
|
sigchain_pop(SIGPIPE);
|
|
|
|
if (finish_command(&gpg) || !len || len < 0)
|
|
return error(_("gpg failed to sign the data"));
|
|
|
|
/* Strip CR from the line endings, in case we are on Windows. */
|
|
for (i = j = bottom; i < signature->len; i++)
|
|
if (signature->buf[i] != '\r') {
|
|
if (i != j)
|
|
signature->buf[j] = signature->buf[i];
|
|
j++;
|
|
}
|
|
strbuf_setlen(signature, j);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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_status)
|
|
{
|
|
struct child_process gpg;
|
|
const char *args_gpg[] = {NULL, "--status-fd=1", "--verify", "FILE", "-", NULL};
|
|
char path[PATH_MAX];
|
|
int fd, ret;
|
|
struct strbuf buf = STRBUF_INIT;
|
|
struct strbuf *pbuf = &buf;
|
|
|
|
args_gpg[0] = gpg_program;
|
|
fd = git_mkstemp(path, PATH_MAX, ".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));
|
|
close(fd);
|
|
|
|
memset(&gpg, 0, sizeof(gpg));
|
|
gpg.argv = args_gpg;
|
|
gpg.in = -1;
|
|
gpg.out = -1;
|
|
if (gpg_output)
|
|
gpg.err = -1;
|
|
args_gpg[3] = path;
|
|
if (start_command(&gpg)) {
|
|
unlink(path);
|
|
return error(_("could not run gpg."));
|
|
}
|
|
|
|
write_in_full(gpg.in, payload, payload_size);
|
|
close(gpg.in);
|
|
|
|
if (gpg_output) {
|
|
strbuf_read(gpg_output, gpg.err, 0);
|
|
close(gpg.err);
|
|
}
|
|
if (gpg_status)
|
|
pbuf = gpg_status;
|
|
strbuf_read(pbuf, gpg.out, 0);
|
|
close(gpg.out);
|
|
|
|
ret = finish_command(&gpg);
|
|
|
|
unlink_or_warn(path);
|
|
|
|
ret |= !strstr(pbuf->buf, "\n[GNUPG:] GOODSIG ");
|
|
strbuf_release(&buf); /* no matter it was used or not */
|
|
|
|
return ret;
|
|
}
|