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-rw-r--r--verifierold.cpp344
1 files changed, 0 insertions, 344 deletions
diff --git a/verifierold.cpp b/verifierold.cpp
deleted file mode 100644
index 4387ab5a4..000000000
--- a/verifierold.cpp
+++ /dev/null
@@ -1,344 +0,0 @@
-/*
- * Copyright (C) 2008 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include "common.h"
-#include "verifierold.h"
-#include "ui.h"
-
-#include "mincrypt/rsa.h"
-#include "mincrypt/sha.h"
-#include "mincrypt/sha256.h"
-
-#include <string.h>
-#include <stdio.h>
-#include <errno.h>
-
-//extern RecoveryUI* ui;
-
-#define PUBLIC_KEYS_FILE "/res/keys"
-
-// Look for an RSA signature embedded in the .ZIP file comment given
-// the path to the zip. Verify it matches one of the given public
-// keys.
-//
-// Return VERIFY_SUCCESS, VERIFY_FAILURE (if any error is encountered
-// or no key matches the signature).
-int verify_file(const char* path) {
- //ui->SetProgress(0.0);
-
- int numKeys;
- Certificate* pKeys = load_keys(PUBLIC_KEYS_FILE, &numKeys);
- if (pKeys == NULL) {
- LOGE("Failed to load keys\n");
- return INSTALL_CORRUPT;
- }
- LOGI("%d key(s) loaded from %s\n", numKeys, PUBLIC_KEYS_FILE);
-
- FILE* f = fopen(path, "rb");
- if (f == NULL) {
- LOGE("failed to open %s (%s)\n", path, strerror(errno));
- return VERIFY_FAILURE;
- }
-
- // An archive with a whole-file signature will end in six bytes:
- //
- // (2-byte signature start) $ff $ff (2-byte comment size)
- //
- // (As far as the ZIP format is concerned, these are part of the
- // archive comment.) We start by reading this footer, this tells
- // us how far back from the end we have to start reading to find
- // the whole comment.
-
-#define FOOTER_SIZE 6
-
- if (fseek(f, -FOOTER_SIZE, SEEK_END) != 0) {
- LOGE("failed to seek in %s (%s)\n", path, strerror(errno));
- fclose(f);
- return VERIFY_FAILURE;
- }
-
- unsigned char footer[FOOTER_SIZE];
- if (fread(footer, 1, FOOTER_SIZE, f) != FOOTER_SIZE) {
- LOGE("failed to read footer from %s (%s)\n", path, strerror(errno));
- fclose(f);
- return VERIFY_FAILURE;
- }
-
- if (footer[2] != 0xff || footer[3] != 0xff) {
- LOGE("footer is wrong\n");
- fclose(f);
- return VERIFY_FAILURE;
- }
-
- size_t comment_size = footer[4] + (footer[5] << 8);
- size_t signature_start = footer[0] + (footer[1] << 8);
- LOGI("comment is %d bytes; signature %d bytes from end\n",
- comment_size, signature_start);
-
- if (signature_start - FOOTER_SIZE < RSANUMBYTES) {
- // "signature" block isn't big enough to contain an RSA block.
- LOGE("signature is too short\n");
- fclose(f);
- return VERIFY_FAILURE;
- }
-
-#define EOCD_HEADER_SIZE 22
-
- // The end-of-central-directory record is 22 bytes plus any
- // comment length.
- size_t eocd_size = comment_size + EOCD_HEADER_SIZE;
-
- if (fseek(f, -eocd_size, SEEK_END) != 0) {
- LOGE("failed to seek in %s (%s)\n", path, strerror(errno));
- fclose(f);
- return VERIFY_FAILURE;
- }
-
- // Determine how much of the file is covered by the signature.
- // This is everything except the signature data and length, which
- // includes all of the EOCD except for the comment length field (2
- // bytes) and the comment data.
- size_t signed_len = ftell(f) + EOCD_HEADER_SIZE - 2;
-
- unsigned char* eocd = (unsigned char*)malloc(eocd_size);
- if (eocd == NULL) {
- LOGE("malloc for EOCD record failed\n");
- fclose(f);
- return VERIFY_FAILURE;
- }
- if (fread(eocd, 1, eocd_size, f) != eocd_size) {
- LOGE("failed to read eocd from %s (%s)\n", path, strerror(errno));
- fclose(f);
- return VERIFY_FAILURE;
- }
-
- // If this is really is the EOCD record, it will begin with the
- // magic number $50 $4b $05 $06.
- if (eocd[0] != 0x50 || eocd[1] != 0x4b ||
- eocd[2] != 0x05 || eocd[3] != 0x06) {
- LOGE("signature length doesn't match EOCD marker\n");
- fclose(f);
- return VERIFY_FAILURE;
- }
-
- size_t i;
- for (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
- // the real one, minzip will find the later (wrong) one,
- // which could be exploitable. Fail verification if
- // this sequence occurs anywhere after the real one.
- LOGE("EOCD marker occurs after start of EOCD\n");
- fclose(f);
- return VERIFY_FAILURE;
- }
- }
-
-#define BUFFER_SIZE 4096
-
- bool need_sha1 = false;
- bool need_sha256 = false;
- for (i = 0; i < numKeys; ++i) {
- switch (pKeys[i].hash_len) {
- case SHA_DIGEST_SIZE: need_sha1 = true; break;
- case SHA256_DIGEST_SIZE: need_sha256 = true; break;
- }
- }
-
- SHA_CTX sha1_ctx;
- SHA256_CTX sha256_ctx;
- SHA_init(&sha1_ctx);
- SHA256_init(&sha256_ctx);
- unsigned char* buffer = (unsigned char*)malloc(BUFFER_SIZE);
- if (buffer == NULL) {
- LOGE("failed to alloc memory for sha1 buffer\n");
- fclose(f);
- return VERIFY_FAILURE;
- }
-
- double frac = -1.0;
- size_t so_far = 0;
- fseek(f, 0, SEEK_SET);
- while (so_far < signed_len) {
- size_t size = BUFFER_SIZE;
- if (signed_len - so_far < size) size = signed_len - so_far;
- if (fread(buffer, 1, size, f) != size) {
- LOGE("failed to read data from %s (%s)\n", path, strerror(errno));
- fclose(f);
- return VERIFY_FAILURE;
- }
- if (need_sha1) SHA_update(&sha1_ctx, buffer, size);
- if (need_sha256) SHA256_update(&sha256_ctx, buffer, size);
- so_far += size;
- double f = so_far / (double)signed_len;
- if (f > frac + 0.02 || size == so_far) {
- //ui->SetProgress(f);
- frac = f;
- }
- }
- fclose(f);
- free(buffer);
-
- const uint8_t* sha1 = SHA_final(&sha1_ctx);
- const uint8_t* sha256 = SHA256_final(&sha256_ctx);
-
- for (i = 0; i < numKeys; ++i) {
- const uint8_t* hash;
- switch (pKeys[i].hash_len) {
- case SHA_DIGEST_SIZE: hash = sha1; break;
- case SHA256_DIGEST_SIZE: hash = sha256; break;
- default: continue;
- }
-
- // The 6 bytes is the "(signature_start) $ff $ff (comment_size)" that
- // the signing tool appends after the signature itself.
- if (RSA_verify(pKeys[i].public_key, eocd + eocd_size - 6 - RSANUMBYTES,
- RSANUMBYTES, hash, pKeys[i].hash_len)) {
- LOGI("whole-file signature verified against key %d\n", i);
- free(eocd);
- return VERIFY_SUCCESS;
- } else {
- LOGI("failed to verify against key %d\n", i);
- }
- LOGI("i: %i, eocd_size: %i, RSANUMBYTES: %i\n", i, eocd_size, RSANUMBYTES);
- }
- free(eocd);
- LOGE("failed to verify whole-file signature\n");
- return VERIFY_FAILURE;
-}
-
-// Reads a file containing one or more public keys as produced by
-// DumpPublicKey: this is an RSAPublicKey struct as it would appear
-// as a C source literal, eg:
-//
-// "{64,0xc926ad21,{1795090719,...,-695002876},{-857949815,...,1175080310}}"
-//
-// For key versions newer than the original 2048-bit e=3 keys
-// supported by Android, the string is preceded by a version
-// identifier, eg:
-//
-// "v2 {64,0xc926ad21,{1795090719,...,-695002876},{-857949815,...,1175080310}}"
-//
-// (Note that the braces and commas in this example are actual
-// characters the parser expects to find in the file; the ellipses
-// indicate more numbers omitted from this example.)
-//
-// The file may contain multiple keys in this format, separated by
-// commas. The last key must not be followed by a comma.
-//
-// A Certificate is a pair of an RSAPublicKey and a particular hash
-// (we support SHA-1 and SHA-256; we store the hash length to signify
-// which is being used). The hash used is implied by the version number.
-//
-// 1: 2048-bit RSA key with e=3 and SHA-1 hash
-// 2: 2048-bit RSA key with e=65537 and SHA-1 hash
-// 3: 2048-bit RSA key with e=3 and SHA-256 hash
-// 4: 2048-bit RSA key with e=65537 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) {
- LOGE("opening %s: %s\n", filename, strerror(errno));
- goto exit;
- }
-
- {
- int i;
- bool done = false;
- while (!done) {
- ++*numKeys;
- out = (Certificate*)realloc(out, *numKeys * sizeof(Certificate));
- Certificate* cert = out + (*numKeys - 1);
- cert->public_key = (RSAPublicKey*)malloc(sizeof(RSAPublicKey));
-
- char start_char;
- if (fscanf(f, " %c", &start_char) != 1) goto exit;
- if (start_char == '{') {
- // a version 1 key has no version specifier.
- cert->public_key->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->public_key->exponent = 65537;
- cert->hash_len = SHA_DIGEST_SIZE;
- break;
- case 3:
- cert->public_key->exponent = 3;
- cert->hash_len = SHA256_DIGEST_SIZE;
- break;
- case 4:
- cert->public_key->exponent = 65537;
- cert->hash_len = SHA256_DIGEST_SIZE;
- break;
- default:
- goto exit;
- }
- }
-
- RSAPublicKey* key = cert->public_key;
- 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, " } } ");
-
- // 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;
- }
- LOGI("read key e=%d hash=%d\n", key->exponent, cert->hash_len);
- }
- }
-
- fclose(f);
- return out;
-
-exit:
- if (f) fclose(f);
- free(out);
- *numKeys = 0;
- return NULL;
-}
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