mirror of
https://github.com/moparisthebest/pacman
synced 2024-11-05 00:55:04 -05:00
a8b22e16ef
After updating a database, remove the old signature to prevent it being used in validation if the new signature fails to download. Signed-off-by: Allan McRae <allan@archlinux.org>
281 lines
7.8 KiB
C
281 lines
7.8 KiB
C
/*
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* signing.c
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*
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* Copyright (c) 2008-2011 Pacman Development Team <pacman-dev@archlinux.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <locale.h> /* setlocale() */
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#include <gpgme.h>
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/* libalpm */
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#include "signing.h"
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#include "package.h"
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#include "util.h"
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#include "log.h"
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#include "alpm.h"
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#define CHECK_ERR(void) do { \
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if(err != GPG_ERR_NO_ERROR) { goto error; } \
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} while(0)
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static int gpgme_init(void)
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{
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static int init = 0;
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const char *version;
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gpgme_error_t err;
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gpgme_engine_info_t enginfo;
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ALPM_LOG_FUNC;
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if(init) {
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/* we already successfully initialized the library */
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return 0;
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}
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if(!alpm_option_get_signaturedir()) {
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RET_ERR(PM_ERR_SIG_MISSINGDIR, 1);
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}
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/* calling gpgme_check_version() returns the current version and runs
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* some internal library setup code */
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version = gpgme_check_version(NULL);
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_alpm_log(PM_LOG_DEBUG, "GPGME version: %s\n", version);
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gpgme_set_locale(NULL, LC_CTYPE, setlocale(LC_CTYPE, NULL));
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#ifdef LC_MESSAGES
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gpgme_set_locale(NULL, LC_MESSAGES, setlocale(LC_MESSAGES, NULL));
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#endif
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/* NOTE:
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* The GPGME library installs a SIGPIPE signal handler automatically if
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* the default signal hander is in use. The only time we set a handler
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* for SIGPIPE is in dload.c, and we reset it when we are done. Given that
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* we do this, we can let GPGME do its automagic. However, if we install
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* a library-wide SIGPIPE handler, we will have to be careful.
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*/
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/* check for OpenPGP support (should be a no-brainer, but be safe) */
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err = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
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CHECK_ERR();
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/* set and check engine information */
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err = gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP, NULL,
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alpm_option_get_signaturedir());
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CHECK_ERR();
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err = gpgme_get_engine_info(&enginfo);
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CHECK_ERR();
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_alpm_log(PM_LOG_DEBUG, "GPGME engine info: file=%s, home=%s\n",
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enginfo->file_name, enginfo->home_dir);
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init = 1;
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return 0;
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error:
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_alpm_log(PM_LOG_ERROR, _("GPGME error: %s\n"), gpgme_strerror(err));
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RET_ERR(PM_ERR_GPGME, 1);
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}
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/**
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* Check the PGP package signature for the given file.
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* @param path the full path to a file
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* @param sig PGP signature data in raw form (already decoded)
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* @return a int value : 0 (valid), 1 (invalid), -1 (an error occured)
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*/
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int _alpm_gpgme_checksig(const char *path, const pmpgpsig_t *sig)
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{
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int ret = 0;
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gpgme_error_t err;
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gpgme_ctx_t ctx;
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gpgme_data_t filedata, sigdata;
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gpgme_verify_result_t result;
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gpgme_signature_t gpgsig;
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FILE *file = NULL, *sigfile = NULL;
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ALPM_LOG_FUNC;
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if(!sig || !sig->rawdata) {
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RET_ERR(PM_ERR_SIG_UNKNOWN, -1);
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}
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if(!path || access(path, R_OK) != 0) {
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RET_ERR(PM_ERR_NOT_A_FILE, -1);
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}
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if(gpgme_init()) {
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/* pm_errno was set in gpgme_init() */
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return -1;
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}
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_alpm_log(PM_LOG_DEBUG, "checking signature for %s\n", path);
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memset(&ctx, 0, sizeof(ctx));
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memset(&sigdata, 0, sizeof(sigdata));
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memset(&filedata, 0, sizeof(filedata));
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err = gpgme_new(&ctx);
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CHECK_ERR();
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/* create our necessary data objects to verify the signature */
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file = fopen(path, "rb");
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if(file == NULL) {
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pm_errno = PM_ERR_NOT_A_FILE;
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ret = -1;
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goto error;
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}
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err = gpgme_data_new_from_stream(&filedata, file);
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CHECK_ERR();
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/* next create data object for the signature */
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err = gpgme_data_new_from_mem(&sigdata, (char*)sig->rawdata, sig->rawlen, 0);
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CHECK_ERR();
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/* here's where the magic happens */
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err = gpgme_op_verify(ctx, sigdata, filedata, NULL);
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CHECK_ERR();
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result = gpgme_op_verify_result(ctx);
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gpgsig = result->signatures;
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if (!gpgsig || gpgsig->next) {
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_alpm_log(PM_LOG_ERROR, _("Unexpected number of signatures\n"));
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ret = -1;
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goto error;
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}
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_alpm_log(PM_LOG_DEBUG, "summary=%x\n", gpgsig->summary);
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_alpm_log(PM_LOG_DEBUG, "fpr=%s\n", gpgsig->fpr);
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_alpm_log(PM_LOG_DEBUG, "status=%d\n", gpgsig->status);
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_alpm_log(PM_LOG_DEBUG, "timestamp=%lu\n", gpgsig->timestamp);
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_alpm_log(PM_LOG_DEBUG, "wrong_key_usage=%u\n", gpgsig->wrong_key_usage);
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_alpm_log(PM_LOG_DEBUG, "pka_trust=%u\n", gpgsig->pka_trust);
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_alpm_log(PM_LOG_DEBUG, "chain_model=%u\n", gpgsig->chain_model);
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_alpm_log(PM_LOG_DEBUG, "validity=%d\n", gpgsig->validity);
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_alpm_log(PM_LOG_DEBUG, "validity_reason=%d\n", gpgsig->validity_reason);
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_alpm_log(PM_LOG_DEBUG, "key=%d\n", gpgsig->pubkey_algo);
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_alpm_log(PM_LOG_DEBUG, "hash=%d\n", gpgsig->hash_algo);
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if(gpgsig->summary & GPGME_SIGSUM_VALID) {
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/* good signature, continue */
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_alpm_log(PM_LOG_DEBUG, _("File %s has a valid signature.\n"),
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path);
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} else if(gpgsig->summary & GPGME_SIGSUM_GREEN) {
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/* 'green' signature, not sure what to do here */
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_alpm_log(PM_LOG_WARNING, _("File %s has a green signature.\n"),
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path);
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} else if(gpgsig->summary & GPGME_SIGSUM_KEY_MISSING) {
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pm_errno = PM_ERR_SIG_UNKNOWN;
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_alpm_log(PM_LOG_WARNING, _("File %s has a signature from an unknown key.\n"),
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path);
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ret = -1;
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} else {
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/* we'll capture everything else here */
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pm_errno = PM_ERR_SIG_INVALID;
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_alpm_log(PM_LOG_ERROR, _("File %s has an invalid signature.\n"),
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path);
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ret = 1;
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}
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error:
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gpgme_data_release(sigdata);
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gpgme_data_release(filedata);
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gpgme_release(ctx);
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if(sigfile) {
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fclose(sigfile);
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}
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if(file) {
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fclose(file);
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}
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if(err != GPG_ERR_NO_ERROR) {
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_alpm_log(PM_LOG_ERROR, _("GPGME error: %s\n"), gpgme_strerror(err));
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RET_ERR(PM_ERR_GPGME, -1);
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}
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return ret;
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}
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/**
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* Load the signature from the given path into the provided struct.
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* @param sigfile the signature to attempt to load
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* @param pgpsig the struct to place the data in
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*
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* @return 0 on success, 1 on file not found, -1 on error
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*/
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int _alpm_load_signature(const char *sigfile, pmpgpsig_t *pgpsig) {
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struct stat st;
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if(access(sigfile, R_OK) == 0 && stat(sigfile, &st) == 0) {
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FILE *f;
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size_t bytes_read;
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if(st.st_size > 4096) {
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return -1;
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}
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if((f = fopen(sigfile, "rb")) == NULL) {
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return -1;
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}
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CALLOC(pgpsig->rawdata, st.st_size, sizeof(unsigned char),
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RET_ERR(PM_ERR_MEMORY, -1));
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bytes_read = fread(pgpsig->rawdata, sizeof(char), st.st_size, f);
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if(bytes_read == (size_t)st.st_size) {
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pgpsig->rawlen = bytes_read;
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_alpm_log(PM_LOG_DEBUG, "loaded gpg signature file, location %s\n",
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sigfile);
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} else {
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_alpm_log(PM_LOG_WARNING, _("Failed reading PGP signature file %s"),
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sigfile);
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FREE(pgpsig->rawdata);
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return -1;
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}
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fclose(f);
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} else {
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_alpm_log(PM_LOG_DEBUG, "signature file %s not found\n", sigfile);
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/* not fatal...we return a different error code here */
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return 1;
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}
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return 0;
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}
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/**
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* Check the PGP package signature for the given package file.
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* @param pkg the package to check
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* @return a int value : 0 (valid), 1 (invalid), -1 (an error occured)
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*/
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int SYMEXPORT alpm_pkg_check_pgp_signature(pmpkg_t *pkg)
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{
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ALPM_LOG_FUNC;
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ASSERT(pkg != NULL, return 0);
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return _alpm_gpgme_checksig(alpm_pkg_get_filename(pkg),
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alpm_pkg_get_pgpsig(pkg));
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}
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/**
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* Check the PGP package signature for the given database.
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* @param db the database to check
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* @return a int value : 0 (valid), 1 (invalid), -1 (an error occured)
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*/
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int SYMEXPORT alpm_db_check_pgp_signature(pmdb_t *db)
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{
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ALPM_LOG_FUNC;
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ASSERT(db != NULL, return(0));
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return _alpm_gpgme_checksig(_alpm_db_path(db),
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_alpm_db_pgpsig(db));
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}
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/* vim: set ts=2 sw=2 noet: */
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