+static int cert_verify_blob(struct blob_attr *cert[CERT_ATTR_MAX],
+ const char *pubkeyfile, const char *pubkeydir) {
+ int i;
+ char msgfname[256], sigfname[256];
+ int ret;
+ char tmpdir[] = "/tmp/ucert-XXXXXX";
+
+ if (mkdtemp(tmpdir) == NULL)
+ return errno;
+
+ snprintf(msgfname, sizeof(msgfname) - 1, "%s/%s", tmpdir, "payload");
+ snprintf(sigfname, sizeof(sigfname) - 1, "%s/%s", tmpdir, "payload.sig");
+
+ for (i = 0; i < CERT_ATTR_MAX; i++) {
+ struct blob_attr *v = cert[i];
+
+ if (!v)
+ break;
+
+ switch(cert_policy[i].type) {
+ case BLOB_ATTR_BINARY:
+ write_file(sigfname, blob_data(v), blob_len(v), false);
+ break;
+ case BLOB_ATTR_NESTED:
+ write_file(msgfname, blob_data(v), blob_len(v), false);
+ break;
+ }
+ }
+
+ ret = usign_v(msgfname, pubkeyfile, pubkeydir, sigfname, quiet);
+
+ unlink(msgfname);
+ unlink(sigfname);
+ rmdir(tmpdir);
+
+ return ret;
+}
+
+static int chain_verify(const char *msgfile, const char *pubkeyfile,
+ const char *pubkeydir, struct list_head *chain) {
+ struct cert_object *cobj;
+ struct blob_attr *containertb[CERT_CT_ATTR_MAX];
+ struct blob_attr *payloadtb[CERT_PL_ATTR_MAX];
+ char tmpdir[] = "/tmp/ucert-XXXXXX";
+ char chainedpubkey[256] = {0};
+ char extsigfile[256] = {0};
+ int ret = 1;
+ int checkmsg = 0;
+
+ if (mkdtemp(tmpdir) == NULL)
+ return errno;
+
+ if (msgfile)
+ checkmsg = -1;
+
+ list_for_each_entry(cobj, chain, list) {
+ ret = cert_verify_blob(cobj->cert, chainedpubkey[0]?chainedpubkey:pubkeyfile, pubkeydir);
+ if (ret)
+ goto clean_and_return;
+
+ if (cobj->cert[CERT_ATTR_PAYLOAD]) {
+ struct timeval tv;
+ uint64_t validfrom;
+ uint64_t expiresat;
+ uint32_t certtype;
+
+ blobmsg_parse(cert_cont_policy,
+ ARRAY_SIZE(cert_cont_policy),
+ containertb,
+ blob_data(cobj->cert[CERT_ATTR_PAYLOAD]),
+ blob_len(cobj->cert[CERT_ATTR_PAYLOAD]));
+ if (!containertb[CERT_CT_ATTR_PAYLOAD]) {
+ ret = 1;
+ fprintf(stderr, "no ucert in signed payload\n");
+ goto clean_and_return;
+ }
+ blobmsg_parse(cert_payload_policy,
+ ARRAY_SIZE(cert_payload_policy),
+ payloadtb,
+ blobmsg_data(containertb[CERT_CT_ATTR_PAYLOAD]),
+ blobmsg_data_len(containertb[CERT_CT_ATTR_PAYLOAD]));
+
+ if (!payloadtb[CERT_PL_ATTR_CERTTYPE] ||
+ !payloadtb[CERT_PL_ATTR_VALIDFROMTIME] ||
+ !payloadtb[CERT_PL_ATTR_EXPIRETIME] ||
+ !payloadtb[CERT_PL_ATTR_PUBKEY]) {
+ ret = 1;
+ fprintf(stderr, "missing mandatory ucert attributes\n");
+ goto clean_and_return;
+ }
+ certtype = blobmsg_get_u32(payloadtb[CERT_PL_ATTR_CERTTYPE]);
+ validfrom = blobmsg_get_u64(payloadtb[CERT_PL_ATTR_VALIDFROMTIME]);
+ expiresat = blobmsg_get_u64(payloadtb[CERT_PL_ATTR_EXPIRETIME]);
+
+ if (certtype != CERTTYPE_AUTH) {
+ ret = 2;
+ fprintf(stderr, "wrong certificate type\n");
+ goto clean_and_return;
+ }
+
+ gettimeofday(&tv, NULL);
+ if (tv.tv_sec < validfrom ||
+ tv.tv_sec >= expiresat) {
+ ret = 3;
+ fprintf(stderr, "certificate expired\n");
+ goto clean_and_return;
+ }
+
+ snprintf(chainedpubkey, sizeof(chainedpubkey) - 1, "%s/%s", tmpdir, "chained-pubkey");
+ write_file(chainedpubkey,
+ blobmsg_data(payloadtb[CERT_PL_ATTR_PUBKEY]),
+ blobmsg_data_len(payloadtb[CERT_PL_ATTR_PUBKEY]),
+ false);
+ } else {
+ if (msgfile) {
+ snprintf(extsigfile, sizeof(extsigfile) - 1, "%s/%s", tmpdir, "ext-sig");
+ write_file(extsigfile,
+ blob_data(cobj->cert[CERT_ATTR_SIGNATURE]),
+ blob_len(cobj->cert[CERT_ATTR_SIGNATURE]),
+ false);
+ checkmsg = ret = usign_v(msgfile,
+ chainedpubkey[0]?chainedpubkey:pubkeyfile,
+ pubkeydir, extsigfile, quiet);
+ unlink(extsigfile);
+ } else {
+ fprintf(stderr, "stray trailing signature without anything to verify!\n");
+ ret = 1;
+ };
+ }
+ }
+
+ if (checkmsg == -1)
+ fprintf(stderr, "missing signature to verify message!\n");
+
+clean_and_return:
+ if (chainedpubkey[0])
+ unlink(chainedpubkey);
+ rmdir(tmpdir);
+ return ret | checkmsg;
+}
+