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https://github.com/git/git
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29b315778e
Implements the actual sign_buffer_ssh operation and move some shared cleanup code into a strbuf function Set gpg.format = ssh and user.signingkey to either a ssh public key string (like from an authorized_keys file), or a ssh key file. If the key file or the config value itself contains only a public key then the private key needs to be available via ssh-agent. gpg.ssh.program can be set to an alternative location of ssh-keygen. A somewhat recent openssh version (8.2p1+) of ssh-keygen is needed for this feature. Since only ssh-keygen is needed it can this way be installed seperately without upgrading your system openssh packages. Signed-off-by: Fabian Stelzer <fs@gigacodes.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
629 lines
16 KiB
C
629 lines
16 KiB
C
#include "cache.h"
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#include "commit.h"
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#include "config.h"
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#include "run-command.h"
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#include "strbuf.h"
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#include "gpg-interface.h"
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#include "sigchain.h"
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#include "tempfile.h"
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static char *configured_signing_key;
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static enum signature_trust_level configured_min_trust_level = TRUST_UNDEFINED;
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struct gpg_format {
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const char *name;
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const char *program;
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const char **verify_args;
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const char **sigs;
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int (*verify_signed_buffer)(struct signature_check *sigc,
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struct gpg_format *fmt, const char *payload,
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size_t payload_size, const char *signature,
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size_t signature_size);
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int (*sign_buffer)(struct strbuf *buffer, struct strbuf *signature,
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const char *signing_key);
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};
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static const char *openpgp_verify_args[] = {
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"--keyid-format=long",
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NULL
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};
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static const char *openpgp_sigs[] = {
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"-----BEGIN PGP SIGNATURE-----",
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"-----BEGIN PGP MESSAGE-----",
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NULL
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};
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static const char *x509_verify_args[] = {
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NULL
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};
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static const char *x509_sigs[] = {
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"-----BEGIN SIGNED MESSAGE-----",
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NULL
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};
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static const char *ssh_verify_args[] = { NULL };
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static const char *ssh_sigs[] = {
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"-----BEGIN SSH SIGNATURE-----",
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NULL
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};
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static int verify_gpg_signed_buffer(struct signature_check *sigc,
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struct gpg_format *fmt, const char *payload,
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size_t payload_size, const char *signature,
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size_t signature_size);
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static int sign_buffer_gpg(struct strbuf *buffer, struct strbuf *signature,
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const char *signing_key);
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static int sign_buffer_ssh(struct strbuf *buffer, struct strbuf *signature,
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const char *signing_key);
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static struct gpg_format gpg_format[] = {
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{
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.name = "openpgp",
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.program = "gpg",
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.verify_args = openpgp_verify_args,
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.sigs = openpgp_sigs,
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.verify_signed_buffer = verify_gpg_signed_buffer,
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.sign_buffer = sign_buffer_gpg,
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},
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{
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.name = "x509",
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.program = "gpgsm",
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.verify_args = x509_verify_args,
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.sigs = x509_sigs,
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.verify_signed_buffer = verify_gpg_signed_buffer,
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.sign_buffer = sign_buffer_gpg,
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},
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{
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.name = "ssh",
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.program = "ssh-keygen",
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.verify_args = ssh_verify_args,
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.sigs = ssh_sigs,
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.verify_signed_buffer = NULL, /* TODO */
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.sign_buffer = sign_buffer_ssh
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},
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};
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static struct gpg_format *use_format = &gpg_format[0];
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static struct gpg_format *get_format_by_name(const char *str)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(gpg_format); i++)
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if (!strcmp(gpg_format[i].name, str))
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return gpg_format + i;
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return NULL;
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}
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static struct gpg_format *get_format_by_sig(const char *sig)
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{
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int i, j;
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for (i = 0; i < ARRAY_SIZE(gpg_format); i++)
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for (j = 0; gpg_format[i].sigs[j]; j++)
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if (starts_with(sig, gpg_format[i].sigs[j]))
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return gpg_format + i;
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return NULL;
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}
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void signature_check_clear(struct signature_check *sigc)
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{
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FREE_AND_NULL(sigc->payload);
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FREE_AND_NULL(sigc->output);
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FREE_AND_NULL(sigc->gpg_status);
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FREE_AND_NULL(sigc->signer);
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FREE_AND_NULL(sigc->key);
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FREE_AND_NULL(sigc->fingerprint);
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FREE_AND_NULL(sigc->primary_key_fingerprint);
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}
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/* An exclusive status -- only one of them can appear in output */
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#define GPG_STATUS_EXCLUSIVE (1<<0)
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/* The status includes key identifier */
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#define GPG_STATUS_KEYID (1<<1)
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/* The status includes user identifier */
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#define GPG_STATUS_UID (1<<2)
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/* The status includes key fingerprints */
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#define GPG_STATUS_FINGERPRINT (1<<3)
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/* The status includes trust level */
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#define GPG_STATUS_TRUST_LEVEL (1<<4)
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/* Short-hand for standard exclusive *SIG status with keyid & UID */
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#define GPG_STATUS_STDSIG (GPG_STATUS_EXCLUSIVE|GPG_STATUS_KEYID|GPG_STATUS_UID)
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static struct {
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char result;
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const char *check;
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unsigned int flags;
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} sigcheck_gpg_status[] = {
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{ 'G', "GOODSIG ", GPG_STATUS_STDSIG },
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{ 'B', "BADSIG ", GPG_STATUS_STDSIG },
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{ 'E', "ERRSIG ", GPG_STATUS_EXCLUSIVE|GPG_STATUS_KEYID },
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{ 'X', "EXPSIG ", GPG_STATUS_STDSIG },
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{ 'Y', "EXPKEYSIG ", GPG_STATUS_STDSIG },
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{ 'R', "REVKEYSIG ", GPG_STATUS_STDSIG },
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{ 0, "VALIDSIG ", GPG_STATUS_FINGERPRINT },
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{ 0, "TRUST_", GPG_STATUS_TRUST_LEVEL },
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};
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static struct {
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const char *key;
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enum signature_trust_level value;
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} sigcheck_gpg_trust_level[] = {
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{ "UNDEFINED", TRUST_UNDEFINED },
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{ "NEVER", TRUST_NEVER },
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{ "MARGINAL", TRUST_MARGINAL },
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{ "FULLY", TRUST_FULLY },
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{ "ULTIMATE", TRUST_ULTIMATE },
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};
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static void replace_cstring(char **field, const char *line, const char *next)
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{
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free(*field);
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if (line && next)
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*field = xmemdupz(line, next - line);
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else
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*field = NULL;
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}
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static int parse_gpg_trust_level(const char *level,
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enum signature_trust_level *res)
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{
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size_t i;
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for (i = 0; i < ARRAY_SIZE(sigcheck_gpg_trust_level); i++) {
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if (!strcmp(sigcheck_gpg_trust_level[i].key, level)) {
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*res = sigcheck_gpg_trust_level[i].value;
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return 0;
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}
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}
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return 1;
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}
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static void parse_gpg_output(struct signature_check *sigc)
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{
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const char *buf = sigc->gpg_status;
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const char *line, *next;
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int i, j;
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int seen_exclusive_status = 0;
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/* Iterate over all lines */
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for (line = buf; *line; line = strchrnul(line+1, '\n')) {
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while (*line == '\n')
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line++;
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if (!*line)
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break;
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/* Skip lines that don't start with GNUPG status */
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if (!skip_prefix(line, "[GNUPG:] ", &line))
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continue;
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/* Iterate over all search strings */
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for (i = 0; i < ARRAY_SIZE(sigcheck_gpg_status); i++) {
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if (skip_prefix(line, sigcheck_gpg_status[i].check, &line)) {
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/*
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* GOODSIG, BADSIG etc. can occur only once for
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* each signature. Therefore, if we had more
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* than one then we're dealing with multiple
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* signatures. We don't support them
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* currently, and they're rather hard to
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* create, so something is likely fishy and we
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* should reject them altogether.
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*/
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if (sigcheck_gpg_status[i].flags & GPG_STATUS_EXCLUSIVE) {
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if (seen_exclusive_status++)
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goto error;
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}
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if (sigcheck_gpg_status[i].result)
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sigc->result = sigcheck_gpg_status[i].result;
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/* Do we have key information? */
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if (sigcheck_gpg_status[i].flags & GPG_STATUS_KEYID) {
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next = strchrnul(line, ' ');
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replace_cstring(&sigc->key, line, next);
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/* Do we have signer information? */
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if (*next && (sigcheck_gpg_status[i].flags & GPG_STATUS_UID)) {
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line = next + 1;
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next = strchrnul(line, '\n');
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replace_cstring(&sigc->signer, line, next);
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}
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}
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/* Do we have trust level? */
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if (sigcheck_gpg_status[i].flags & GPG_STATUS_TRUST_LEVEL) {
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/*
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* GPG v1 and v2 differs in how the
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* TRUST_ lines are written. Some
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* trust lines contain no additional
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* space-separated information for v1.
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*/
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size_t trust_size = strcspn(line, " \n");
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char *trust = xmemdupz(line, trust_size);
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if (parse_gpg_trust_level(trust, &sigc->trust_level)) {
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free(trust);
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goto error;
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}
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free(trust);
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}
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/* Do we have fingerprint? */
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if (sigcheck_gpg_status[i].flags & GPG_STATUS_FINGERPRINT) {
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const char *limit;
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char **field;
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next = strchrnul(line, ' ');
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replace_cstring(&sigc->fingerprint, line, next);
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/*
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* Skip interim fields. The search is
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* limited to the same line since only
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* OpenPGP signatures has a field with
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* the primary fingerprint.
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*/
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limit = strchrnul(line, '\n');
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for (j = 9; j > 0; j--) {
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if (!*next || limit <= next)
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break;
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line = next + 1;
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next = strchrnul(line, ' ');
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}
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field = &sigc->primary_key_fingerprint;
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if (!j) {
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next = strchrnul(line, '\n');
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replace_cstring(field, line, next);
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} else {
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replace_cstring(field, NULL, NULL);
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}
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}
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break;
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}
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}
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}
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return;
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error:
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sigc->result = 'E';
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/* Clear partial data to avoid confusion */
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FREE_AND_NULL(sigc->primary_key_fingerprint);
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FREE_AND_NULL(sigc->fingerprint);
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FREE_AND_NULL(sigc->signer);
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FREE_AND_NULL(sigc->key);
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}
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static int verify_gpg_signed_buffer(struct signature_check *sigc,
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struct gpg_format *fmt, const char *payload,
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size_t payload_size, const char *signature,
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size_t signature_size)
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{
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struct child_process gpg = CHILD_PROCESS_INIT;
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struct tempfile *temp;
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int ret;
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struct strbuf gpg_stdout = STRBUF_INIT;
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struct strbuf gpg_stderr = STRBUF_INIT;
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temp = mks_tempfile_t(".git_vtag_tmpXXXXXX");
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if (!temp)
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return error_errno(_("could not create temporary file"));
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if (write_in_full(temp->fd, signature, signature_size) < 0 ||
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close_tempfile_gently(temp) < 0) {
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error_errno(_("failed writing detached signature to '%s'"),
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temp->filename.buf);
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delete_tempfile(&temp);
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return -1;
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}
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strvec_push(&gpg.args, fmt->program);
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strvec_pushv(&gpg.args, fmt->verify_args);
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strvec_pushl(&gpg.args,
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"--status-fd=1",
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"--verify", temp->filename.buf, "-",
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NULL);
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sigchain_push(SIGPIPE, SIG_IGN);
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ret = pipe_command(&gpg, payload, payload_size, &gpg_stdout, 0,
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&gpg_stderr, 0);
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sigchain_pop(SIGPIPE);
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delete_tempfile(&temp);
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ret |= !strstr(gpg_stdout.buf, "\n[GNUPG:] GOODSIG ");
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sigc->payload = xmemdupz(payload, payload_size);
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sigc->output = strbuf_detach(&gpg_stderr, NULL);
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sigc->gpg_status = strbuf_detach(&gpg_stdout, NULL);
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parse_gpg_output(sigc);
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strbuf_release(&gpg_stdout);
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strbuf_release(&gpg_stderr);
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return ret;
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}
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int check_signature(const char *payload, size_t plen, const char *signature,
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size_t slen, struct signature_check *sigc)
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{
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struct gpg_format *fmt;
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int status;
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sigc->result = 'N';
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sigc->trust_level = -1;
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fmt = get_format_by_sig(signature);
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if (!fmt)
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die(_("bad/incompatible signature '%s'"), signature);
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status = fmt->verify_signed_buffer(sigc, fmt, payload, plen, signature,
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slen);
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if (status && !sigc->output)
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return !!status;
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status |= sigc->result != 'G';
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status |= sigc->trust_level < configured_min_trust_level;
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return !!status;
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}
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void print_signature_buffer(const struct signature_check *sigc, unsigned flags)
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{
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const char *output = flags & GPG_VERIFY_RAW ? sigc->gpg_status :
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sigc->output;
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if (flags & GPG_VERIFY_VERBOSE && sigc->payload)
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fputs(sigc->payload, stdout);
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if (output)
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fputs(output, stderr);
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}
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size_t parse_signed_buffer(const char *buf, size_t size)
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{
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size_t len = 0;
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size_t match = size;
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while (len < size) {
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const char *eol;
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if (get_format_by_sig(buf + len))
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match = len;
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eol = memchr(buf + len, '\n', size - len);
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len += eol ? eol - (buf + len) + 1 : size - len;
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}
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return match;
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}
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int parse_signature(const char *buf, size_t size, struct strbuf *payload, struct strbuf *signature)
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{
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size_t match = parse_signed_buffer(buf, size);
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if (match != size) {
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strbuf_add(payload, buf, match);
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remove_signature(payload);
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strbuf_add(signature, buf + match, size - match);
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return 1;
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}
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return 0;
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}
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void set_signing_key(const char *key)
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{
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free(configured_signing_key);
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configured_signing_key = xstrdup(key);
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}
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int git_gpg_config(const char *var, const char *value, void *cb)
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{
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struct gpg_format *fmt = NULL;
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char *fmtname = NULL;
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char *trust;
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int ret;
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if (!strcmp(var, "user.signingkey")) {
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if (!value)
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return config_error_nonbool(var);
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set_signing_key(value);
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return 0;
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}
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if (!strcmp(var, "gpg.format")) {
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if (!value)
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return config_error_nonbool(var);
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fmt = get_format_by_name(value);
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if (!fmt)
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return error("unsupported value for %s: %s",
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var, value);
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use_format = fmt;
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return 0;
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}
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if (!strcmp(var, "gpg.mintrustlevel")) {
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if (!value)
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return config_error_nonbool(var);
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trust = xstrdup_toupper(value);
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ret = parse_gpg_trust_level(trust, &configured_min_trust_level);
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free(trust);
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if (ret)
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return error("unsupported value for %s: %s", var,
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value);
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return 0;
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}
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if (!strcmp(var, "gpg.program") || !strcmp(var, "gpg.openpgp.program"))
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fmtname = "openpgp";
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if (!strcmp(var, "gpg.x509.program"))
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fmtname = "x509";
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if (!strcmp(var, "gpg.ssh.program"))
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fmtname = "ssh";
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if (fmtname) {
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fmt = get_format_by_name(fmtname);
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return git_config_string(&fmt->program, var, value);
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}
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return 0;
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}
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const char *get_signing_key(void)
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{
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if (configured_signing_key)
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return configured_signing_key;
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return git_committer_info(IDENT_STRICT|IDENT_NO_DATE);
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}
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int sign_buffer(struct strbuf *buffer, struct strbuf *signature, const char *signing_key)
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{
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return use_format->sign_buffer(buffer, signature, signing_key);
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}
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/*
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* Strip CR from the line endings, in case we are on Windows.
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* NEEDSWORK: make it trim only CRs before LFs and rename
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*/
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static void remove_cr_after(struct strbuf *buffer, size_t offset)
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{
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size_t i, j;
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for (i = j = offset; i < buffer->len; i++) {
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if (buffer->buf[i] != '\r') {
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if (i != j)
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buffer->buf[j] = buffer->buf[i];
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j++;
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}
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}
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strbuf_setlen(buffer, j);
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}
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static int sign_buffer_gpg(struct strbuf *buffer, struct strbuf *signature,
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const char *signing_key)
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{
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struct child_process gpg = CHILD_PROCESS_INIT;
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int ret;
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size_t bottom;
|
|
struct strbuf gpg_status = STRBUF_INIT;
|
|
|
|
strvec_pushl(&gpg.args,
|
|
use_format->program,
|
|
"--status-fd=2",
|
|
"-bsau", signing_key,
|
|
NULL);
|
|
|
|
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);
|
|
ret = pipe_command(&gpg, buffer->buf, buffer->len,
|
|
signature, 1024, &gpg_status, 0);
|
|
sigchain_pop(SIGPIPE);
|
|
|
|
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. */
|
|
remove_cr_after(signature, bottom);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sign_buffer_ssh(struct strbuf *buffer, struct strbuf *signature,
|
|
const char *signing_key)
|
|
{
|
|
struct child_process signer = CHILD_PROCESS_INIT;
|
|
int ret = -1;
|
|
size_t bottom, keylen;
|
|
struct strbuf signer_stderr = STRBUF_INIT;
|
|
struct tempfile *key_file = NULL, *buffer_file = NULL;
|
|
char *ssh_signing_key_file = NULL;
|
|
struct strbuf ssh_signature_filename = STRBUF_INIT;
|
|
|
|
if (!signing_key || signing_key[0] == '\0')
|
|
return error(
|
|
_("user.signingkey needs to be set for ssh signing"));
|
|
|
|
if (starts_with(signing_key, "ssh-")) {
|
|
/* A literal ssh key */
|
|
key_file = mks_tempfile_t(".git_signing_key_tmpXXXXXX");
|
|
if (!key_file)
|
|
return error_errno(
|
|
_("could not create temporary file"));
|
|
keylen = strlen(signing_key);
|
|
if (write_in_full(key_file->fd, signing_key, keylen) < 0 ||
|
|
close_tempfile_gently(key_file) < 0) {
|
|
error_errno(_("failed writing ssh signing key to '%s'"),
|
|
key_file->filename.buf);
|
|
goto out;
|
|
}
|
|
ssh_signing_key_file = strbuf_detach(&key_file->filename, NULL);
|
|
} else {
|
|
/* We assume a file */
|
|
ssh_signing_key_file = expand_user_path(signing_key, 1);
|
|
}
|
|
|
|
buffer_file = mks_tempfile_t(".git_signing_buffer_tmpXXXXXX");
|
|
if (!buffer_file) {
|
|
error_errno(_("could not create temporary file"));
|
|
goto out;
|
|
}
|
|
|
|
if (write_in_full(buffer_file->fd, buffer->buf, buffer->len) < 0 ||
|
|
close_tempfile_gently(buffer_file) < 0) {
|
|
error_errno(_("failed writing ssh signing key buffer to '%s'"),
|
|
buffer_file->filename.buf);
|
|
goto out;
|
|
}
|
|
|
|
strvec_pushl(&signer.args, use_format->program,
|
|
"-Y", "sign",
|
|
"-n", "git",
|
|
"-f", ssh_signing_key_file,
|
|
buffer_file->filename.buf,
|
|
NULL);
|
|
|
|
sigchain_push(SIGPIPE, SIG_IGN);
|
|
ret = pipe_command(&signer, NULL, 0, NULL, 0, &signer_stderr, 0);
|
|
sigchain_pop(SIGPIPE);
|
|
|
|
if (ret) {
|
|
if (strstr(signer_stderr.buf, "usage:"))
|
|
error(_("ssh-keygen -Y sign is needed for ssh signing (available in openssh version 8.2p1+)"));
|
|
|
|
error("%s", signer_stderr.buf);
|
|
goto out;
|
|
}
|
|
|
|
bottom = signature->len;
|
|
|
|
strbuf_addbuf(&ssh_signature_filename, &buffer_file->filename);
|
|
strbuf_addstr(&ssh_signature_filename, ".sig");
|
|
if (strbuf_read_file(signature, ssh_signature_filename.buf, 0) < 0) {
|
|
error_errno(
|
|
_("failed reading ssh signing data buffer from '%s'"),
|
|
ssh_signature_filename.buf);
|
|
}
|
|
unlink_or_warn(ssh_signature_filename.buf);
|
|
|
|
/* Strip CR from the line endings, in case we are on Windows. */
|
|
remove_cr_after(signature, bottom);
|
|
|
|
out:
|
|
if (key_file)
|
|
delete_tempfile(&key_file);
|
|
if (buffer_file)
|
|
delete_tempfile(&buffer_file);
|
|
strbuf_release(&signer_stderr);
|
|
strbuf_release(&ssh_signature_filename);
|
|
FREE_AND_NULL(ssh_signing_key_file);
|
|
return ret;
|
|
}
|