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Verify server signature

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This commit is contained in:
Iwan Timmer 2016-04-01 14:31:58 +02:00
parent 61812554c5
commit f2ada1fa20
1 changed files with 56 additions and 1 deletions
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57
libgamestream/client.c
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@ -327,6 +327,34 @@ static int sign_it(const char *msg, size_t mlen, unsigned char **sig, size_t *sl
return result;
}
static bool verifySignature(const char *data, int dataLength, const char *signature, int signatureLength, const char *cert) {
X509* x509;
BIO* bio = BIO_new(BIO_s_mem());
BIO_puts(bio, cert);
x509 = PEM_read_bio_X509(bio, NULL, NULL, NULL);
BIO_free(bio);
if (!x509) {
printf("Invalid certificate\n");
return false;
}
EVP_PKEY* pubKey = X509_get_pubkey(x509);
EVP_MD_CTX *mdctx = NULL;
mdctx = EVP_MD_CTX_create();
EVP_DigestVerifyInit(mdctx, NULL, EVP_sha256(), NULL, pubKey);
EVP_DigestVerifyUpdate(mdctx, data, dataLength);
int result = EVP_DigestVerifyFinal(mdctx, signature, signatureLength);
X509_free(x509);
EVP_PKEY_free(pubKey);
EVP_MD_CTX_destroy(mdctx);
printf("%d/%d = %d\n", dataLength, signatureLength, result);
return result > 0;
}
int gs_unpair(PSERVER_DATA server) {
int ret = GS_OK;
char url[4096];
@ -385,6 +413,24 @@ int gs_pair(PSERVER_DATA server, char* pin) {
goto cleanup;
}
free(result);
result = NULL;
if ((ret = xml_search(data->memory, data->size, "plaincert", &result)) != GS_OK)
goto cleanup;
if (strlen(result)/2 > 8191) {
gs_error = "Server certificate too big";
ret = GS_FAILED;
goto cleanup;
}
char plaincert[8192];
for (int count = 0; count < strlen(result); count += 2) {
sscanf(&result[count], "%2hhx", &plaincert[count / 2]);
}
plaincert[strlen(result)/2] = '\0';
printf("%d / %d\n", strlen(result)/2, strlen(plaincert));
unsigned char salt_pin[20];
unsigned char aes_key_hash[32];
AES_KEY enc_key, dec_key;
@ -485,7 +531,16 @@ int gs_pair(PSERVER_DATA server, char* pin) {
goto cleanup;
}
//TODO: verify pairingsecret
char pairing_secret[16 + 256];
for (int count = 0; count < strlen(result); count += 2) {
sscanf(&result[count], "%2hhx", &pairing_secret[count / 2]);
}
if (!verifySignature(pairing_secret, 16, pairing_secret+16, 256, plaincert)) {
gs_error = "MITM attack detected";
ret = GS_FAILED;
goto cleanup;
}
unsigned char *signature = NULL;
size_t s_len;