With libarchive v3.5.0 we have API to fetch the digest from the mtree. Use that to validate if the installed files are modified or not. As always, a modified backup file will trigger a warning but will not result in an actual failure. v2: Produce separate messages for failed to calc checksum vs missing checksum information in mtree Signed-off-by: Emil Velikov --- src/pacman/check.c | 74 +++++++++++++++++++++++++++++++++++++++++----- 1 file changed, 67 insertions(+), 7 deletions(-) diff --git a/src/pacman/check.c b/src/pacman/check.c index 02217d0f..ec741a95 100644 --- a/src/pacman/check.c +++ b/src/pacman/check.c @@ -176,19 +176,78 @@ static int check_file_size(const char *pkgname, const char *filepath, return 0; } -/* placeholders - libarchive currently does not read checksums from mtree files -static int check_file_md5sum(const char *pkgname, const char *filepath, - struct stat *st, struct archive_entry *entry, int backup) +#if ARCHIVE_VERSION_NUMBER >= 3005000 +static int check_file_cksum(const char *pkgname, const char *filepath, + int backup, const char *cksum_name, const char *cksum_calc, const char *cksum_mtree) { + if(!cksum_calc) { + if(!config->quiet) { + pm_printf(ALPM_LOG_WARNING, _("%s: %s (failed to calculate %s checksum)\n"), + pkgname, filepath, cksum_name); + } + return 1; + } + + if(!cksum_mtree) { + if(!config->quiet) { + pm_printf(ALPM_LOG_WARNING, _("%s: %s (%s checksum information not available)\n"), + pkgname, filepath, cksum_name); + } + return 1; + } + + if(strcmp(cksum_calc, cksum_mtree) != 0) { + if(backup) { + if(!config->quiet) { + printf("%s%s%s: ", config->colstr.title, _("backup file"), + config->colstr.nocolor); + printf(_("%s: %s (%s checksum mismatch)\n"), + pkgname, filepath, cksum_name); + } + return 0; + } + if(!config->quiet) { + pm_printf(ALPM_LOG_WARNING, _("%s: %s (%s checksum mismatch)\n"), + pkgname, filepath, cksum_name); + } + return 1; + } + return 0; } +#endif + +static int check_file_md5sum(const char *pkgname, const char *filepath, + struct archive_entry *entry, int backup) +{ + int errors = 0; +#if ARCHIVE_VERSION_NUMBER >= 3005000 + char *cksum_calc = alpm_compute_md5sum(filepath); + char *cksum_mtree = hex_representation(archive_entry_digest(entry, + ARCHIVE_ENTRY_DIGEST_MD5), 16); + errors = check_file_cksum(pkgname, filepath, backup, "MD5", cksum_calc, + cksum_mtree); + free(cksum_mtree); + free(cksum_calc); +#endif + return (errors != 0 ? 1 : 0); +} static int check_file_sha256sum(const char *pkgname, const char *filepath, - struct stat *st, struct archive_entry *entry, int backup) + struct archive_entry *entry, int backup) { - return 0; + int errors = 0; +#if ARCHIVE_VERSION_NUMBER >= 3005000 + char *cksum_calc = alpm_compute_sha256sum(filepath); + char *cksum_mtree = hex_representation(archive_entry_digest(entry, + ARCHIVE_ENTRY_DIGEST_SHA256), 32); + errors = check_file_cksum(pkgname, filepath, backup, "SHA256", cksum_calc, + cksum_mtree); + free(cksum_mtree); + free(cksum_calc); +#endif + return (errors != 0 ? 1 : 0); } -*/ /* Loop through the files of the package to check if they exist. */ int check_pkg_fast(alpm_pkg_t *pkg) @@ -369,7 +428,8 @@ int check_pkg_full(alpm_pkg_t *pkg) if(type == AE_IFREG) { file_errors += check_file_size(pkgname, filepath, &st, entry, backup); - /* file_errors += check_file_md5sum(pkgname, filepath, &st, entry, backup); */ + file_errors += check_file_md5sum(pkgname, filepath, entry, backup); + file_errors += check_file_sha256sum(pkgname, filepath, entry, backup); } if(config->quiet && file_errors) { -- 2.30.0