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honor parse and next return values

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Sergio R. Caprile committed 2026-11-09 10:53:05 -03:00
1 parent b415c23bc5
commit 2d7e44201d
2 files changed
+32 -36
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src/tls_builtin.c
+16 -18
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@@ -1712,36 +1712,34 @@ static int mg_tls_verify_cert_san(const uint8_t *der, size_t dersz,
return -1;
}
static void unpadlen(uint8_t *sig, struct mg_der_tlv *a, struct mg_der_tlv *b,
uint32_t n) {
if (a->len > n) a->value += (a->len - n), a->len = n;
if (b->len > n) b->value += (b->len - n), b->len = n;
memset(sig, 0, n - a->len); // short encoding
memmove(sig + (n - a->len), a->value, a->len);
memset(sig + n, 0, n - b->len);
memmove(sig + n + (n - b->len), b->value, b->len);
}
static int mg_tls_verify_cert_signature(const struct mg_tls_cert *cert,
const struct mg_tls_cert *issuer) {
if (issuer->is_ec_pubkey) {
uint8_t sig[128];
struct mg_der_tlv seq = {0, 0, 0}, a = {0, 0, 0}, b = {0, 0, 0};
mg_der_parse((uint8_t *) cert->sig.buf, cert->sig.len, &seq);
mg_der_next(&seq, &a);
mg_der_next(&seq, &b);
if (a.len == 0 || b.len == 0) {
if (mg_der_parse((uint8_t *) cert->sig.buf, cert->sig.len, &seq) <= 0 ||
seq.type != 0x30 || mg_der_next(&seq, &a) <= 0 || a.type != 0x02 ||
mg_der_next(&seq, &b) <= 0 || b.type != 0x02 || a.len == 0 ||
b.len == 0 || seq.len != 0) {
MG_ERROR(("cert verification error"));
return 0;
}
if (issuer->pubkey.len == 64) {
const uint32_t N = 32;
if (a.len > N) a.value += (a.len - N), a.len = N; // padding
if (b.len > N) b.value += (b.len - N), b.len = N;
memset(sig, 0, N - a.len); // short encoding
memmove(sig + (N - a.len), a.value, a.len);
memset(sig + N, 0, N - b.len);
memmove(sig + N + (N - b.len), b.value, b.len);
unpadlen(sig, &a, &b, 32);
return mg_p256_verify((uint8_t *) issuer->pubkey.buf, cert->tbshash,
cert->tbshashsz, sig);
} else if (issuer->pubkey.len == 96) {
const uint32_t N = 48;
if (a.len > N) a.value += (a.len - N), a.len = N; // padding
if (b.len > N) b.value += (b.len - N), b.len = N;
memset(sig, 0, N - a.len); // short encoding
memmove(sig + (N - a.len), a.value, a.len);
memset(sig + N, 0, N - b.len);
memmove(sig + N + (N - b.len), b.value, b.len);
unpadlen(sig, &a, &b, 48);
return mg_p384_verify((uint8_t *) issuer->pubkey.buf, cert->tbshash,
cert->tbshashsz, sig);
} else {