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Download and verify package database signatures

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If signature verification is needed, attempt to download a signature
file for a repo when it is updated. Return an error if unable to
download signature only when checking is mandatory, or if signature is
invalid.

TODO: At the moment the database signature is only checked on download.
Should we do anything with a database if it fails to be verified to prevent
its future usage?

Signed-off-by: Allan McRae <allan@archlinux.org>
This commit is contained in:
Allan McRae 2010-11-22 16:06:16 +10:00 committed by Dan McGee
parent 9a3325a56d
commit 38da050f31
1 changed files with 38 additions and 6 deletions
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44
lib/libalpm/be_sync.c
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@ -126,24 +126,56 @@ int SYMEXPORT alpm_db_update(int force, pmdb_t *db)
}
ret = _alpm_download_single_file(dbfile, db->servers, syncpath, force);
free(dbfile);
free(syncpath);
umask(oldmask);
if(ret == 1) {
/* files match, do nothing */
pm_errno = 0;
return 1;
goto cleanup;
} else if(ret == -1) {
/* pm_errno was set by the download code */
_alpm_log(PM_LOG_DEBUG, "failed to sync db: %s\n", alpm_strerrorlast());
return -1;
goto cleanup;
}
/* Download and check the signature of the database if needed */
if(db->pgp_verify != PM_PGP_VERIFY_NEVER) {
char *sigfile;
int sigret;
len = strlen(dbfile) + 5;
MALLOC(sigfile, len, RET_ERR(PM_ERR_MEMORY, -1));
sprintf(sigfile, "%s.sig", dbfile);
sigret = _alpm_download_single_file(sigfile, db->servers, syncpath, 1);
free(sigfile);
if(sigret == -1 && db->pgp_verify == PM_PGP_VERIFY_ALWAYS) {
_alpm_log(PM_LOG_ERROR, _("Failed to download signature for db: %s\n"),
alpm_strerrorlast());
pm_errno = PM_ERR_SIG_INVALID;
ret = -1;
goto cleanup;
}
sigret = alpm_db_check_pgp_signature(db);
if((db->pgp_verify == PM_PGP_VERIFY_ALWAYS && sigret != 0) ||
(db->pgp_verify == PM_PGP_VERIFY_OPTIONAL && sigret == 1)) {
/* pm_errno was set by the checking code */
/* TODO: should we just leave the unverified database */
ret = -1;
goto cleanup;
}
}
/* Cache needs to be rebuilt */
_alpm_db_free_pkgcache(db);
return 0;
cleanup:
free(dbfile);
free(syncpath);
umask(oldmask);
return ret;
}
/* Forward decl so I don't reorganize the whole file right now */