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Read also unsigned index-meta

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This commit is contained in:
Piotr Wójcik 2019-10-01 21:18:25 +02:00 committed by Juan RP
parent 09125769bd
commit 61ef5c3f8a
1 changed files with 50 additions and 16 deletions
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66
lib/repo.c
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@ -61,7 +61,7 @@ xbps_repo_path_with_name(struct xbps_handle *xhp, const char *url, const char *n
url, xhp->target_arch ? xhp->target_arch : xhp->native_arch, name);
}
static bool
static int
repo_verify_index(struct xbps_repo *repo, xbps_dictionary_t idxmeta, unsigned char *digest) {
bool verified = false;
unsigned char *sig_buf = NULL;
@ -72,28 +72,28 @@ repo_verify_index(struct xbps_repo *repo, xbps_dictionary_t idxmeta, unsigned ch
xbps_dbg_printf(repo->xhp,
"%s: read_next_header %s\n", repo->uri,
archive_error_string(repo->ar));
return false;
return ENOENT;
}
if (strcmp(archive_entry_pathname(entry), XBPS_REPOIDXMETA_SIG) != 0) {
xbps_dbg_printf(repo->xhp,
"%s: no signature of %s\n", repo->uri, XBPS_REPOIDX_META);
return false;
return ENOENT;
}
sigfilelen = (size_t)archive_entry_size(entry);
sig_buf = (unsigned char *) xbps_archive_get_file(repo->ar, entry);
if (sig_buf == NULL) {
return false;
return EIO;
}
verified = xbps_verify_digest_signature(repo, idxmeta, sig_buf, sigfilelen, digest);
free(sig_buf);
return verified;
return verified ? 0 : EINVAL;
}
static xbps_dictionary_t
repo_get_dict(struct xbps_repo *repo, bool *verified)
repo_get_dict(struct xbps_repo *repo, int *verify_error)
{
struct archive_entry *entry;
int rv;
@ -101,8 +101,8 @@ repo_get_dict(struct xbps_repo *repo, bool *verified)
char *bytes = NULL;
unsigned char *digest = NULL;
if (verified != NULL)
*verified = false;
if (verify_error != NULL)
*verify_error = -1;
if (repo->ar == NULL)
return NULL;
@ -116,15 +116,36 @@ repo_get_dict(struct xbps_repo *repo, bool *verified)
}
dict = xbps_archive_get_dictionary(repo->ar, entry, &bytes);
idxmeta = (repo->idxmeta != NULL) ? repo->idxmeta : dict;
if (verified != NULL && bytes != NULL) {
if (verify_error != NULL && bytes != NULL) {
digest = xbps_buffer_hash_raw(bytes, strlen(bytes));
*verified = repo_verify_index(repo, idxmeta, digest);
*verify_error = repo_verify_index(repo, idxmeta, digest);
}
free(digest);
free(bytes);
return dict;
}
static xbps_dictionary_t
get_safe_idxmeta(xbps_dictionary_t full) {
static const char *keys[] = {
"public-key",
"public-key-size",
"signature-by",
"signature-type",
};
unsigned fields_count = (sizeof keys)/(sizeof *keys);
xbps_dictionary_t safe = xbps_dictionary_create();
for (unsigned i = 0; i < fields_count; ++i) {
const char *key = keys[i];
xbps_object_t value = xbps_dictionary_get(full, key);
xbps_dictionary_set(safe, key, value);
}
return safe;
}
bool
xbps_repo_lock(struct xbps_handle *xhp, const char *repodir,
int *lockfd, char **lockfname)
@ -180,8 +201,9 @@ repo_open_local(struct xbps_repo *repo, const char *repofile)
{
struct stat st;
int rv = 0;
bool verified = false;
int verify_error = -1;
const char *signature_type = NULL;
xbps_dictionary_t idxmeta = NULL;
if (fstat(repo->fd, &st) == -1) {
rv = errno;
@ -213,14 +235,26 @@ repo_open_local(struct xbps_repo *repo, const char *repofile)
return false;
}
xbps_dictionary_make_immutable(repo->idx);
repo->idxmeta = repo_get_dict(repo, &verified);
if (repo->idxmeta != NULL) {
if (xbps_dictionary_get_cstring_nocopy(repo->idxmeta, "signature-type", &signature_type))
idxmeta = repo_get_dict(repo, &verify_error);
if (idxmeta != NULL) {
if (verify_error == ENOENT) {
xbps_dbg_printf(repo->xhp, "Metadata of repo '%s' not signed. Taking safe part.\n", repofile);
idxmeta = get_safe_idxmeta(idxmeta);
verify_error = 0;
} else if (verify_error) {
xbps_warn_printf("Verification of repo's '%s' signature failed. Taking safe part.\n", repofile);
idxmeta = get_safe_idxmeta(idxmeta);
} else {
xbps_dbg_printf(repo->xhp, "Verification of repo's '%s' signature passed.\n", repofile);
}
if (xbps_dictionary_get_cstring_nocopy(idxmeta, "signature-type", &signature_type)) {
repo->is_signed = true;
xbps_dictionary_make_immutable(repo->idxmeta);
}
xbps_dictionary_make_immutable(idxmeta);
}
repo->idxmeta = idxmeta;
return verified || (!repo->is_remote && !repo->is_signed);
return !verify_error || (!repo->is_remote && !repo->is_signed);
}
static bool