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-rw-r--r--verifier.cpp265
1 files changed, 124 insertions, 141 deletions
diff --git a/verifier.cpp b/verifier.cpp
index 61e5adf0b..9a2d60c66 100644
--- a/verifier.cpp
+++ b/verifier.cpp
@@ -113,7 +113,7 @@ static bool read_pkcs7(uint8_t* pkcs7_der, size_t pkcs7_der_len, uint8_t** sig_d
// or no key matches the signature).
int verify_file(unsigned char* addr, size_t length,
- const Certificate* pKeys, unsigned int numKeys) {
+ const std::vector<Certificate>& keys) {
ui->SetProgress(0.0);
// An archive with a whole-file signature will end in six bytes:
@@ -176,8 +176,7 @@ int verify_file(unsigned char* addr, size_t length,
return VERIFY_FAILURE;
}
- size_t i;
- for (i = 4; i < eocd_size-3; ++i) {
+ for (size_t i = 4; i < eocd_size-3; ++i) {
if (eocd[i ] == 0x50 && eocd[i+1] == 0x4b &&
eocd[i+2] == 0x05 && eocd[i+3] == 0x06) {
// if the sequence $50 $4b $05 $06 appears anywhere after
@@ -193,8 +192,8 @@ int verify_file(unsigned char* addr, size_t length,
bool need_sha1 = false;
bool need_sha256 = false;
- for (i = 0; i < numKeys; ++i) {
- switch (pKeys[i].hash_len) {
+ for (const auto& key : keys) {
+ switch (key.hash_len) {
case SHA_DIGEST_SIZE: need_sha1 = true; break;
case SHA256_DIGEST_SIZE: need_sha256 = true; break;
}
@@ -225,7 +224,7 @@ int verify_file(unsigned char* addr, size_t length,
const uint8_t* sha1 = SHA_final(&sha1_ctx);
const uint8_t* sha256 = SHA256_final(&sha256_ctx);
- uint8_t* sig_der = NULL;
+ uint8_t* sig_der = nullptr;
size_t sig_der_length = 0;
size_t signature_size = signature_start - FOOTER_SIZE;
@@ -240,9 +239,10 @@ int verify_file(unsigned char* addr, size_t length,
* any key can match, we need to try each before determining a verification
* failure has happened.
*/
- for (i = 0; i < numKeys; ++i) {
+ size_t i = 0;
+ for (const auto& key : keys) {
const uint8_t* hash;
- switch (pKeys[i].hash_len) {
+ switch (key.hash_len) {
case SHA_DIGEST_SIZE: hash = sha1; break;
case SHA256_DIGEST_SIZE: hash = sha256; break;
default: continue;
@@ -250,15 +250,15 @@ int verify_file(unsigned char* addr, size_t length,
// The 6 bytes is the "(signature_start) $ff $ff (comment_size)" that
// the signing tool appends after the signature itself.
- if (pKeys[i].key_type == Certificate::RSA) {
+ if (key.key_type == Certificate::RSA) {
if (sig_der_length < RSANUMBYTES) {
// "signature" block isn't big enough to contain an RSA block.
LOGI("signature is too short for RSA key %zu\n", i);
continue;
}
- if (!RSA_verify(pKeys[i].rsa, sig_der, RSANUMBYTES,
- hash, pKeys[i].hash_len)) {
+ if (!RSA_verify(key.rsa.get(), sig_der, RSANUMBYTES,
+ hash, key.hash_len)) {
LOGI("failed to verify against RSA key %zu\n", i);
continue;
}
@@ -266,8 +266,8 @@ int verify_file(unsigned char* addr, size_t length,
LOGI("whole-file signature verified against RSA key %zu\n", i);
free(sig_der);
return VERIFY_SUCCESS;
- } else if (pKeys[i].key_type == Certificate::EC
- && pKeys[i].hash_len == SHA256_DIGEST_SIZE) {
+ } else if (key.key_type == Certificate::EC
+ && key.hash_len == SHA256_DIGEST_SIZE) {
p256_int r, s;
if (!dsa_sig_unpack(sig_der, sig_der_length, &r, &s)) {
LOGI("Not a DSA signature block for EC key %zu\n", i);
@@ -276,7 +276,7 @@ int verify_file(unsigned char* addr, size_t length,
p256_int p256_hash;
p256_from_bin(hash, &p256_hash);
- if (!p256_ecdsa_verify(&(pKeys[i].ec->x), &(pKeys[i].ec->y),
+ if (!p256_ecdsa_verify(&(key.ec->x), &(key.ec->y),
&p256_hash, &r, &s)) {
LOGI("failed to verify against EC key %zu\n", i);
continue;
@@ -286,8 +286,9 @@ int verify_file(unsigned char* addr, size_t length,
free(sig_der);
return VERIFY_SUCCESS;
} else {
- LOGI("Unknown key type %d\n", pKeys[i].key_type);
+ LOGI("Unknown key type %d\n", key.key_type);
}
+ i++;
}
free(sig_der);
LOGE("failed to verify whole-file signature\n");
@@ -323,140 +324,122 @@ int verify_file(unsigned char* addr, size_t length,
// 4: 2048-bit RSA key with e=65537 and SHA-256 hash
// 5: 256-bit EC key using the NIST P-256 curve parameters and SHA-256 hash
//
-// Returns NULL if the file failed to parse, or if it contain zero keys.
-Certificate*
-load_keys(const char* filename, int* numKeys) {
- Certificate* out = NULL;
- *numKeys = 0;
-
- FILE* f = fopen(filename, "r");
- if (f == NULL) {
+// Returns true on success, and appends the found keys (at least one) to certs.
+// Otherwise returns false if the file failed to parse, or if it contains zero
+// keys. The contents in certs would be unspecified on failure.
+bool load_keys(const char* filename, std::vector<Certificate>& certs) {
+ std::unique_ptr<FILE, decltype(&fclose)> f(fopen(filename, "r"), fclose);
+ if (!f) {
LOGE("opening %s: %s\n", filename, strerror(errno));
- goto exit;
+ return false;
}
- {
- int i;
- bool done = false;
- while (!done) {
- ++*numKeys;
- out = (Certificate*)realloc(out, *numKeys * sizeof(Certificate));
- Certificate* cert = out + (*numKeys - 1);
- memset(cert, '\0', sizeof(Certificate));
-
- char start_char;
- if (fscanf(f, " %c", &start_char) != 1) goto exit;
- if (start_char == '{') {
- // a version 1 key has no version specifier.
- cert->key_type = Certificate::RSA;
- cert->rsa = (RSAPublicKey*)malloc(sizeof(RSAPublicKey));
- cert->rsa->exponent = 3;
- cert->hash_len = SHA_DIGEST_SIZE;
- } else if (start_char == 'v') {
- int version;
- if (fscanf(f, "%d {", &version) != 1) goto exit;
- switch (version) {
- case 2:
- cert->key_type = Certificate::RSA;
- cert->rsa = (RSAPublicKey*)malloc(sizeof(RSAPublicKey));
- cert->rsa->exponent = 65537;
- cert->hash_len = SHA_DIGEST_SIZE;
- break;
- case 3:
- cert->key_type = Certificate::RSA;
- cert->rsa = (RSAPublicKey*)malloc(sizeof(RSAPublicKey));
- cert->rsa->exponent = 3;
- cert->hash_len = SHA256_DIGEST_SIZE;
- break;
- case 4:
- cert->key_type = Certificate::RSA;
- cert->rsa = (RSAPublicKey*)malloc(sizeof(RSAPublicKey));
- cert->rsa->exponent = 65537;
- cert->hash_len = SHA256_DIGEST_SIZE;
- break;
- case 5:
- cert->key_type = Certificate::EC;
- cert->ec = (ECPublicKey*)calloc(1, sizeof(ECPublicKey));
- cert->hash_len = SHA256_DIGEST_SIZE;
- break;
- default:
- goto exit;
- }
+ while (true) {
+ certs.emplace_back(0, Certificate::RSA, nullptr, nullptr);
+ Certificate& cert = certs.back();
+
+ char start_char;
+ if (fscanf(f.get(), " %c", &start_char) != 1) return false;
+ if (start_char == '{') {
+ // a version 1 key has no version specifier.
+ cert.key_type = Certificate::RSA;
+ cert.rsa = std::unique_ptr<RSAPublicKey>(new RSAPublicKey);
+ cert.rsa->exponent = 3;
+ cert.hash_len = SHA_DIGEST_SIZE;
+ } else if (start_char == 'v') {
+ int version;
+ if (fscanf(f.get(), "%d {", &version) != 1) return false;
+ switch (version) {
+ case 2:
+ cert.key_type = Certificate::RSA;
+ cert.rsa = std::unique_ptr<RSAPublicKey>(new RSAPublicKey);
+ cert.rsa->exponent = 65537;
+ cert.hash_len = SHA_DIGEST_SIZE;
+ break;
+ case 3:
+ cert.key_type = Certificate::RSA;
+ cert.rsa = std::unique_ptr<RSAPublicKey>(new RSAPublicKey);
+ cert.rsa->exponent = 3;
+ cert.hash_len = SHA256_DIGEST_SIZE;
+ break;
+ case 4:
+ cert.key_type = Certificate::RSA;
+ cert.rsa = std::unique_ptr<RSAPublicKey>(new RSAPublicKey);
+ cert.rsa->exponent = 65537;
+ cert.hash_len = SHA256_DIGEST_SIZE;
+ break;
+ case 5:
+ cert.key_type = Certificate::EC;
+ cert.ec = std::unique_ptr<ECPublicKey>(new ECPublicKey);
+ cert.hash_len = SHA256_DIGEST_SIZE;
+ break;
+ default:
+ return false;
}
+ }
- if (cert->key_type == Certificate::RSA) {
- RSAPublicKey* key = cert->rsa;
- if (fscanf(f, " %i , 0x%x , { %u",
- &(key->len), &(key->n0inv), &(key->n[0])) != 3) {
- goto exit;
- }
- if (key->len != RSANUMWORDS) {
- LOGE("key length (%d) does not match expected size\n", key->len);
- goto exit;
- }
- for (i = 1; i < key->len; ++i) {
- if (fscanf(f, " , %u", &(key->n[i])) != 1) goto exit;
- }
- if (fscanf(f, " } , { %u", &(key->rr[0])) != 1) goto exit;
- for (i = 1; i < key->len; ++i) {
- if (fscanf(f, " , %u", &(key->rr[i])) != 1) goto exit;
- }
- fscanf(f, " } } ");
-
- LOGI("read key e=%d hash=%d\n", key->exponent, cert->hash_len);
- } else if (cert->key_type == Certificate::EC) {
- ECPublicKey* key = cert->ec;
- int key_len;
- unsigned int byte;
- uint8_t x_bytes[P256_NBYTES];
- uint8_t y_bytes[P256_NBYTES];
- if (fscanf(f, " %i , { %u", &key_len, &byte) != 2) goto exit;
- if (key_len != P256_NBYTES) {
- LOGE("Key length (%d) does not match expected size %d\n", key_len, P256_NBYTES);
- goto exit;
- }
- x_bytes[P256_NBYTES - 1] = byte;
- for (i = P256_NBYTES - 2; i >= 0; --i) {
- if (fscanf(f, " , %u", &byte) != 1) goto exit;
- x_bytes[i] = byte;
- }
- if (fscanf(f, " } , { %u", &byte) != 1) goto exit;
- y_bytes[P256_NBYTES - 1] = byte;
- for (i = P256_NBYTES - 2; i >= 0; --i) {
- if (fscanf(f, " , %u", &byte) != 1) goto exit;
- y_bytes[i] = byte;
- }
- fscanf(f, " } } ");
- p256_from_bin(x_bytes, &key->x);
- p256_from_bin(y_bytes, &key->y);
- } else {
- LOGE("Unknown key type %d\n", cert->key_type);
- goto exit;
+ if (cert.key_type == Certificate::RSA) {
+ RSAPublicKey* key = cert.rsa.get();
+ if (fscanf(f.get(), " %i , 0x%x , { %u", &(key->len), &(key->n0inv),
+ &(key->n[0])) != 3) {
+ return false;
}
-
- // if the line ends in a comma, this file has more keys.
- switch (fgetc(f)) {
- case ',':
- // more keys to come.
- break;
-
- case EOF:
- done = true;
- break;
-
- default:
- LOGE("unexpected character between keys\n");
- goto exit;
+ if (key->len != RSANUMWORDS) {
+ LOGE("key length (%d) does not match expected size\n", key->len);
+ return false;
+ }
+ for (int i = 1; i < key->len; ++i) {
+ if (fscanf(f.get(), " , %u", &(key->n[i])) != 1) return false;
+ }
+ if (fscanf(f.get(), " } , { %u", &(key->rr[0])) != 1) return false;
+ for (int i = 1; i < key->len; ++i) {
+ if (fscanf(f.get(), " , %u", &(key->rr[i])) != 1) return false;
+ }
+ fscanf(f.get(), " } } ");
+
+ LOGI("read key e=%d hash=%d\n", key->exponent, cert.hash_len);
+ } else if (cert.key_type == Certificate::EC) {
+ ECPublicKey* key = cert.ec.get();
+ int key_len;
+ unsigned int byte;
+ uint8_t x_bytes[P256_NBYTES];
+ uint8_t y_bytes[P256_NBYTES];
+ if (fscanf(f.get(), " %i , { %u", &key_len, &byte) != 2) return false;
+ if (key_len != P256_NBYTES) {
+ LOGE("Key length (%d) does not match expected size %d\n", key_len, P256_NBYTES);
+ return false;
+ }
+ x_bytes[P256_NBYTES - 1] = byte;
+ for (int i = P256_NBYTES - 2; i >= 0; --i) {
+ if (fscanf(f.get(), " , %u", &byte) != 1) return false;
+ x_bytes[i] = byte;
+ }
+ if (fscanf(f.get(), " } , { %u", &byte) != 1) return false;
+ y_bytes[P256_NBYTES - 1] = byte;
+ for (int i = P256_NBYTES - 2; i >= 0; --i) {
+ if (fscanf(f.get(), " , %u", &byte) != 1) return false;
+ y_bytes[i] = byte;
}
+ fscanf(f.get(), " } } ");
+ p256_from_bin(x_bytes, &key->x);
+ p256_from_bin(y_bytes, &key->y);
+ } else {
+ LOGE("Unknown key type %d\n", cert.key_type);
+ return false;
}
- }
- fclose(f);
- return out;
+ // if the line ends in a comma, this file has more keys.
+ int ch = fgetc(f.get());
+ if (ch == ',') {
+ // more keys to come.
+ continue;
+ } else if (ch == EOF) {
+ break;
+ } else {
+ LOGE("unexpected character between keys\n");
+ return false;
+ }
+ }
-exit:
- if (f) fclose(f);
- free(out);
- *numKeys = 0;
- return NULL;
+ return true;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-08 23:59:27 +0100