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-rw-r--r--modules/libmar/sign/mar_sign.c1130
1 files changed, 1130 insertions, 0 deletions
diff --git a/modules/libmar/sign/mar_sign.c b/modules/libmar/sign/mar_sign.c
new file mode 100644
index 0000000000..87f67ca80c
--- /dev/null
+++ b/modules/libmar/sign/mar_sign.c
@@ -0,0 +1,1130 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifdef XP_WIN
+# ifndef WIN32_LEAN_AND_MEAN
+# define WIN32_LEAN_AND_MEAN
+# endif
+#endif
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include "mar_private.h"
+#include "mar_cmdline.h"
+#include "mar.h"
+#include "cryptox.h"
+#ifndef XP_WIN
+# include <unistd.h>
+#endif
+
+#include "nss_secutil.h"
+#include "base64.h"
+
+/**
+ * Initializes the NSS context.
+ *
+ * @param NSSConfigDir The config dir containing the private key to use
+ * @return 0 on success
+ * -1 on error
+ */
+int NSSInitCryptoContext(const char* NSSConfigDir) {
+ SECStatus status =
+ NSS_Initialize(NSSConfigDir, "", "", SECMOD_DB, NSS_INIT_READONLY);
+ if (SECSuccess != status) {
+ fprintf(stderr, "ERROR: Could not initialize NSS\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+/**
+ * Obtains a signing context.
+ *
+ * @param ctx A pointer to the signing context to fill
+ * @return 0 on success
+ * -1 on error
+ */
+int NSSSignBegin(const char* certName, SGNContext** ctx,
+ SECKEYPrivateKey** privKey, CERTCertificate** cert,
+ uint32_t* signatureLength) {
+ secuPWData pwdata = {PW_NONE, 0};
+ if (!certName || !ctx || !privKey || !cert || !signatureLength) {
+ fprintf(stderr, "ERROR: Invalid parameter passed to NSSSignBegin\n");
+ return -1;
+ }
+
+ /* Get the cert and embedded public key out of the database */
+ *cert = PK11_FindCertFromNickname(certName, &pwdata);
+ if (!*cert) {
+ fprintf(stderr, "ERROR: Could not find cert from nickname\n");
+ return -1;
+ }
+
+ /* Get the private key out of the database */
+ *privKey = PK11_FindKeyByAnyCert(*cert, &pwdata);
+ if (!*privKey) {
+ fprintf(stderr, "ERROR: Could not find private key\n");
+ return -1;
+ }
+
+ *signatureLength = PK11_SignatureLen(*privKey);
+
+ if (*signatureLength > BLOCKSIZE) {
+ fprintf(stderr,
+ "ERROR: Program must be compiled with a larger block size"
+ " to support signing with signatures this large: %u.\n",
+ *signatureLength);
+ return -1;
+ }
+
+ /* Check that the key length is large enough for our requirements */
+ if (*signatureLength < XP_MIN_SIGNATURE_LEN_IN_BYTES) {
+ fprintf(stderr, "ERROR: Key length must be >= %d bytes\n",
+ XP_MIN_SIGNATURE_LEN_IN_BYTES);
+ return -1;
+ }
+
+ *ctx = SGN_NewContext(SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION, *privKey);
+ if (!*ctx) {
+ fprintf(stderr, "ERROR: Could not create signature context\n");
+ return -1;
+ }
+
+ if (SGN_Begin(*ctx) != SECSuccess) {
+ fprintf(stderr, "ERROR: Could not begin signature\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+/**
+ * Writes the passed buffer to the file fp and updates the signature contexts.
+ *
+ * @param fpDest The file pointer to write to.
+ * @param buffer The buffer to write.
+ * @param size The size of the buffer to write.
+ * @param ctxs Pointer to the first element in an array of signature
+ * contexts to update.
+ * @param ctxCount The number of signature contexts pointed to by ctxs
+ * @param err The name of what is being written to in case of error.
+ * @return 0 on success
+ * -2 on write error
+ * -3 on signature update error
+ */
+int WriteAndUpdateSignatures(FILE* fpDest, void* buffer, uint32_t size,
+ SGNContext** ctxs, uint32_t ctxCount,
+ const char* err) {
+ uint32_t k;
+ if (!size) {
+ return 0;
+ }
+
+ if (fwrite(buffer, size, 1, fpDest) != 1) {
+ fprintf(stderr, "ERROR: Could not write %s\n", err);
+ return -2;
+ }
+
+ for (k = 0; k < ctxCount; ++k) {
+ if (SGN_Update(ctxs[k], buffer, size) != SECSuccess) {
+ fprintf(stderr, "ERROR: Could not update signature context for %s\n",
+ err);
+ return -3;
+ }
+ }
+ return 0;
+}
+
+/**
+ * Adjusts each entry's content offset in the the passed in index by the
+ * specified amount.
+ *
+ * @param indexBuf A buffer containing the MAR index
+ * @param indexLength The length of the MAR index
+ * @param offsetAmount The amount to adjust each index entry by
+ */
+void AdjustIndexContentOffsets(char* indexBuf, uint32_t indexLength,
+ uint32_t offsetAmount) {
+ uint32_t* offsetToContent;
+ char* indexBufLoc = indexBuf;
+
+ /* Consume the index and adjust each index by the specified amount */
+ while (indexBufLoc != (indexBuf + indexLength)) {
+ /* Adjust the offset */
+ offsetToContent = (uint32_t*)indexBufLoc;
+ *offsetToContent = ntohl(*offsetToContent);
+ *offsetToContent += offsetAmount;
+ *offsetToContent = htonl(*offsetToContent);
+ /* Skip past the offset, length, and flags */
+ indexBufLoc += 3 * sizeof(uint32_t);
+ indexBufLoc += strlen(indexBufLoc) + 1;
+ }
+}
+
+/**
+ * Reads from fpSrc, writes it to fpDest, and updates the signature contexts.
+ *
+ * @param fpSrc The file pointer to read from.
+ * @param fpDest The file pointer to write to.
+ * @param buffer The buffer to write.
+ * @param size The size of the buffer to write.
+ * @param ctxs Pointer to the first element in an array of signature
+ * contexts to update.
+ * @param ctxCount The number of signature contexts pointed to by ctxs
+ * @param err The name of what is being written to in case of error.
+ * @return 0 on success
+ * -1 on read error
+ * -2 on write error
+ * -3 on signature update error
+ */
+int ReadWriteAndUpdateSignatures(FILE* fpSrc, FILE* fpDest, void* buffer,
+ uint32_t size, SGNContext** ctxs,
+ uint32_t ctxCount, const char* err) {
+ if (!size) {
+ return 0;
+ }
+
+ if (fread(buffer, size, 1, fpSrc) != 1) {
+ fprintf(stderr, "ERROR: Could not read %s\n", err);
+ return -1;
+ }
+
+ return WriteAndUpdateSignatures(fpDest, buffer, size, ctxs, ctxCount, err);
+}
+
+/**
+ * Reads from fpSrc, writes it to fpDest.
+ *
+ * @param fpSrc The file pointer to read from.
+ * @param fpDest The file pointer to write to.
+ * @param buffer The buffer to write.
+ * @param size The size of the buffer to write.
+ * @param err The name of what is being written to in case of error.
+ * @return 0 on success
+ * -1 on read error
+ * -2 on write error
+ */
+int ReadAndWrite(FILE* fpSrc, FILE* fpDest, void* buffer, uint32_t size,
+ const char* err) {
+ if (!size) {
+ return 0;
+ }
+
+ if (fread(buffer, size, 1, fpSrc) != 1) {
+ fprintf(stderr, "ERROR: Could not read %s\n", err);
+ return -1;
+ }
+
+ if (fwrite(buffer, size, 1, fpDest) != 1) {
+ fprintf(stderr, "ERROR: Could not write %s\n", err);
+ return -2;
+ }
+
+ return 0;
+}
+
+/**
+ * Writes out a copy of the MAR at src but with the signature block stripped.
+ *
+ * @param src The path of the source MAR file
+ * @param dest The path of the MAR file to write out that
+ has no signature block
+ * @return 0 on success
+ * -1 on error
+*/
+int strip_signature_block(const char* src, const char* dest) {
+ uint32_t offsetToIndex, dstOffsetToIndex, indexLength, numSignatures = 0,
+ leftOver;
+ int32_t stripAmount = 0;
+ int64_t oldPos, numChunks, i, realSizeOfSrcMAR, numBytesToCopy,
+ sizeOfEntireMAR = 0;
+ FILE *fpSrc = NULL, *fpDest = NULL;
+ int rv = -1, hasSignatureBlock;
+ char buf[BLOCKSIZE];
+ char* indexBuf = NULL;
+
+ if (!src || !dest) {
+ fprintf(stderr, "ERROR: Invalid parameter passed in.\n");
+ return -1;
+ }
+
+ fpSrc = fopen(src, "rb");
+ if (!fpSrc) {
+ fprintf(stderr, "ERROR: could not open source file: %s\n", src);
+ goto failure;
+ }
+
+ fpDest = fopen(dest, "wb");
+ if (!fpDest) {
+ fprintf(stderr, "ERROR: could not create target file: %s\n", dest);
+ goto failure;
+ }
+
+ /* Determine if the source MAR file has the new fields for signing or not */
+ if (get_mar_file_info(src, &hasSignatureBlock, NULL, NULL, NULL, NULL)) {
+ fprintf(stderr, "ERROR: could not determine if MAR is old or new.\n");
+ goto failure;
+ }
+
+ /* MAR ID */
+ if (ReadAndWrite(fpSrc, fpDest, buf, MAR_ID_SIZE, "MAR ID")) {
+ goto failure;
+ }
+
+ /* Offset to index */
+ if (fread(&offsetToIndex, sizeof(offsetToIndex), 1, fpSrc) != 1) {
+ fprintf(stderr, "ERROR: Could not read offset\n");
+ goto failure;
+ }
+ offsetToIndex = ntohl(offsetToIndex);
+
+ /* Get the real size of the MAR */
+ oldPos = ftello(fpSrc);
+ if (fseeko(fpSrc, 0, SEEK_END)) {
+ fprintf(stderr, "ERROR: Could not seek to end of file.\n");
+ goto failure;
+ }
+ realSizeOfSrcMAR = ftello(fpSrc);
+ if (fseeko(fpSrc, oldPos, SEEK_SET)) {
+ fprintf(stderr, "ERROR: Could not seek back to current location.\n");
+ goto failure;
+ }
+
+ if (hasSignatureBlock) {
+ /* Get the MAR length and adjust its size */
+ if (fread(&sizeOfEntireMAR, sizeof(sizeOfEntireMAR), 1, fpSrc) != 1) {
+ fprintf(stderr, "ERROR: Could read mar size\n");
+ goto failure;
+ }
+ sizeOfEntireMAR = NETWORK_TO_HOST64(sizeOfEntireMAR);
+ if (sizeOfEntireMAR != realSizeOfSrcMAR) {
+ fprintf(stderr, "ERROR: Source MAR is not of the right size\n");
+ goto failure;
+ }
+
+ /* Get the num signatures in the source file so we know what to strip */
+ if (fread(&numSignatures, sizeof(numSignatures), 1, fpSrc) != 1) {
+ fprintf(stderr, "ERROR: Could read num signatures\n");
+ goto failure;
+ }
+ numSignatures = ntohl(numSignatures);
+
+ for (i = 0; i < numSignatures; i++) {
+ uint32_t signatureLen;
+
+ /* Skip past the signature algorithm ID */
+ if (fseeko(fpSrc, sizeof(uint32_t), SEEK_CUR)) {
+ fprintf(stderr, "ERROR: Could not skip past signature algorithm ID\n");
+ }
+
+ /* Read in the length of the signature so we know how far to skip */
+ if (fread(&signatureLen, sizeof(uint32_t), 1, fpSrc) != 1) {
+ fprintf(stderr, "ERROR: Could not read signatures length.\n");
+ return CryptoX_Error;
+ }
+ signatureLen = ntohl(signatureLen);
+
+ /* Skip past the signature */
+ if (fseeko(fpSrc, signatureLen, SEEK_CUR)) {
+ fprintf(stderr, "ERROR: Could not skip past signature algorithm ID\n");
+ }
+
+ stripAmount += sizeof(uint32_t) + sizeof(uint32_t) + signatureLen;
+ }
+
+ } else {
+ sizeOfEntireMAR = realSizeOfSrcMAR;
+ numSignatures = 0;
+ }
+
+ if (((int64_t)offsetToIndex) > sizeOfEntireMAR) {
+ fprintf(stderr, "ERROR: Offset to index is larger than the file size.\n");
+ goto failure;
+ }
+
+ dstOffsetToIndex = offsetToIndex;
+ if (!hasSignatureBlock) {
+ dstOffsetToIndex += sizeof(sizeOfEntireMAR) + sizeof(numSignatures);
+ }
+ dstOffsetToIndex -= stripAmount;
+
+ /* Write out the index offset */
+ dstOffsetToIndex = htonl(dstOffsetToIndex);
+ if (fwrite(&dstOffsetToIndex, sizeof(dstOffsetToIndex), 1, fpDest) != 1) {
+ fprintf(stderr, "ERROR: Could not write offset to index\n");
+ goto failure;
+ }
+ dstOffsetToIndex = ntohl(dstOffsetToIndex);
+
+ /* Write out the new MAR file size */
+ if (!hasSignatureBlock) {
+ sizeOfEntireMAR += sizeof(sizeOfEntireMAR) + sizeof(numSignatures);
+ }
+ sizeOfEntireMAR -= stripAmount;
+
+ /* Write out the MAR size */
+ sizeOfEntireMAR = HOST_TO_NETWORK64(sizeOfEntireMAR);
+ if (fwrite(&sizeOfEntireMAR, sizeof(sizeOfEntireMAR), 1, fpDest) != 1) {
+ fprintf(stderr, "ERROR: Could not write size of MAR\n");
+ goto failure;
+ }
+ sizeOfEntireMAR = NETWORK_TO_HOST64(sizeOfEntireMAR);
+
+ /* Write out the number of signatures, which is 0 */
+ numSignatures = 0;
+ if (fwrite(&numSignatures, sizeof(numSignatures), 1, fpDest) != 1) {
+ fprintf(stderr, "ERROR: Could not write out num signatures\n");
+ goto failure;
+ }
+
+ /* Write out the rest of the MAR excluding the index header and index
+ offsetToIndex unfortunately has to remain 32-bit because for backwards
+ compatibility with the old MAR file format. */
+ if (ftello(fpSrc) > ((int64_t)offsetToIndex)) {
+ fprintf(stderr, "ERROR: Index offset is too small.\n");
+ goto failure;
+ }
+ numBytesToCopy = ((int64_t)offsetToIndex) - ftello(fpSrc);
+ numChunks = numBytesToCopy / BLOCKSIZE;
+ leftOver = numBytesToCopy % BLOCKSIZE;
+
+ /* Read each file and write it to the MAR file */
+ for (i = 0; i < numChunks; ++i) {
+ if (ReadAndWrite(fpSrc, fpDest, buf, BLOCKSIZE, "content block")) {
+ goto failure;
+ }
+ }
+
+ /* Write out the left over */
+ if (ReadAndWrite(fpSrc, fpDest, buf, leftOver, "left over content block")) {
+ goto failure;
+ }
+
+ /* Length of the index */
+ if (ReadAndWrite(fpSrc, fpDest, &indexLength, sizeof(indexLength),
+ "index length")) {
+ goto failure;
+ }
+ indexLength = ntohl(indexLength);
+
+ /* Consume the index and adjust each index by the difference */
+ indexBuf = malloc(indexLength);
+ if (fread(indexBuf, indexLength, 1, fpSrc) != 1) {
+ fprintf(stderr, "ERROR: Could not read index\n");
+ goto failure;
+ }
+
+ /* Adjust each entry in the index */
+ if (hasSignatureBlock) {
+ AdjustIndexContentOffsets(indexBuf, indexLength, -stripAmount);
+ } else {
+ AdjustIndexContentOffsets(
+ indexBuf, indexLength,
+ sizeof(sizeOfEntireMAR) + sizeof(numSignatures) - stripAmount);
+ }
+
+ if (fwrite(indexBuf, indexLength, 1, fpDest) != 1) {
+ fprintf(stderr, "ERROR: Could not write index\n");
+ goto failure;
+ }
+
+ rv = 0;
+failure:
+ if (fpSrc) {
+ fclose(fpSrc);
+ }
+
+ if (fpDest) {
+ fclose(fpDest);
+ }
+
+ if (rv) {
+ remove(dest);
+ }
+
+ if (indexBuf) {
+ free(indexBuf);
+ }
+
+ if (rv) {
+ remove(dest);
+ }
+ return rv;
+}
+
+/**
+ * Extracts a signature from a MAR file, base64 encodes it, and writes it out
+ *
+ * @param src The path of the source MAR file
+ * @param sigIndex The index of the signature to extract
+ * @param dest The path of file to write the signature to
+ * @return 0 on success
+ * -1 on error
+ */
+int extract_signature(const char* src, uint32_t sigIndex, const char* dest) {
+ FILE *fpSrc = NULL, *fpDest = NULL;
+ uint32_t i;
+ uint32_t signatureCount;
+ uint32_t signatureLen;
+ uint8_t* extractedSignature = NULL;
+ char* base64Encoded = NULL;
+ int rv = -1;
+ if (!src || !dest) {
+ fprintf(stderr, "ERROR: Invalid parameter passed in.\n");
+ goto failure;
+ }
+
+ fpSrc = fopen(src, "rb");
+ if (!fpSrc) {
+ fprintf(stderr, "ERROR: could not open source file: %s\n", src);
+ goto failure;
+ }
+
+ fpDest = fopen(dest, "wb");
+ if (!fpDest) {
+ fprintf(stderr, "ERROR: could not create target file: %s\n", dest);
+ goto failure;
+ }
+
+ /* Skip to the start of the signature block */
+ if (fseeko(fpSrc, SIGNATURE_BLOCK_OFFSET, SEEK_SET)) {
+ fprintf(stderr, "ERROR: could not seek to signature block\n");
+ goto failure;
+ }
+
+ /* Get the number of signatures */
+ if (fread(&signatureCount, sizeof(signatureCount), 1, fpSrc) != 1) {
+ fprintf(stderr, "ERROR: could not read signature count\n");
+ goto failure;
+ }
+ signatureCount = ntohl(signatureCount);
+ if (sigIndex >= signatureCount) {
+ fprintf(stderr, "ERROR: Signature index was out of range\n");
+ goto failure;
+ }
+
+ /* Skip to the correct signature */
+ for (i = 0; i <= sigIndex; i++) {
+ /* Avoid leaking while skipping signatures */
+ free(extractedSignature);
+ extractedSignature = NULL;
+
+ /* skip past the signature algorithm ID */
+ if (fseeko(fpSrc, sizeof(uint32_t), SEEK_CUR)) {
+ fprintf(stderr, "ERROR: Could not seek past sig algorithm ID.\n");
+ goto failure;
+ }
+
+ /* Get the signature length */
+ if (fread(&signatureLen, sizeof(signatureLen), 1, fpSrc) != 1) {
+ fprintf(stderr, "ERROR: could not read signature length\n");
+ goto failure;
+ }
+ signatureLen = ntohl(signatureLen);
+
+ /* Get the signature */
+ extractedSignature = malloc(signatureLen);
+ if (fread(extractedSignature, signatureLen, 1, fpSrc) != 1) {
+ fprintf(stderr, "ERROR: could not read signature\n");
+ goto failure;
+ }
+ }
+
+ base64Encoded = BTOA_DataToAscii(extractedSignature, signatureLen);
+ if (!base64Encoded) {
+ fprintf(stderr, "ERROR: could not obtain base64 encoded data\n");
+ goto failure;
+ }
+
+ if (fwrite(base64Encoded, strlen(base64Encoded), 1, fpDest) != 1) {
+ fprintf(stderr, "ERROR: Could not write base64 encoded string\n");
+ goto failure;
+ }
+
+ rv = 0;
+failure:
+ if (base64Encoded) {
+ PORT_Free(base64Encoded);
+ }
+
+ if (extractedSignature) {
+ free(extractedSignature);
+ }
+
+ if (fpSrc) {
+ fclose(fpSrc);
+ }
+
+ if (fpDest) {
+ fclose(fpDest);
+ }
+
+ if (rv) {
+ remove(dest);
+ }
+
+ return rv;
+}
+
+/**
+ * Imports a base64 encoded signature into a MAR file
+ *
+ * @param src The path of the source MAR file
+ * @param sigIndex The index of the signature to import
+ * @param base64SigFile A file which contains the signature to import
+ * @param dest The path of the destination MAR file with replaced
+ * signature
+ * @return 0 on success
+ * -1 on error
+ */
+int import_signature(const char* src, uint32_t sigIndex,
+ const char* base64SigFile, const char* dest) {
+ int rv = -1;
+ FILE* fpSrc = NULL;
+ FILE* fpDest = NULL;
+ FILE* fpSigFile = NULL;
+ uint32_t i;
+ uint32_t signatureCount, signatureLen, signatureAlgorithmID, numChunks,
+ leftOver;
+ char buf[BLOCKSIZE];
+ uint64_t sizeOfSrcMAR, sizeOfBase64EncodedFile;
+ char* passedInSignatureB64 = NULL;
+ uint8_t* passedInSignatureRaw = NULL;
+ uint8_t* extractedMARSignature = NULL;
+ unsigned int passedInSignatureLenRaw;
+
+ if (!src || !dest) {
+ fprintf(stderr, "ERROR: Invalid parameter passed in.\n");
+ goto failure;
+ }
+
+ fpSrc = fopen(src, "rb");
+ if (!fpSrc) {
+ fprintf(stderr, "ERROR: could not open source file: %s\n", src);
+ goto failure;
+ }
+
+ fpDest = fopen(dest, "wb");
+ if (!fpDest) {
+ fprintf(stderr, "ERROR: could not open dest file: %s\n", dest);
+ goto failure;
+ }
+
+ fpSigFile = fopen(base64SigFile, "rb");
+ if (!fpSigFile) {
+ fprintf(stderr, "ERROR: could not open sig file: %s\n", base64SigFile);
+ goto failure;
+ }
+
+ /* Get the src file size */
+ if (fseeko(fpSrc, 0, SEEK_END)) {
+ fprintf(stderr, "ERROR: Could not seek to end of src file.\n");
+ goto failure;
+ }
+ sizeOfSrcMAR = ftello(fpSrc);
+ if (fseeko(fpSrc, 0, SEEK_SET)) {
+ fprintf(stderr, "ERROR: Could not seek to start of src file.\n");
+ goto failure;
+ }
+
+ /* Get the sig file size */
+ if (fseeko(fpSigFile, 0, SEEK_END)) {
+ fprintf(stderr, "ERROR: Could not seek to end of sig file.\n");
+ goto failure;
+ }
+ sizeOfBase64EncodedFile = ftello(fpSigFile);
+ if (fseeko(fpSigFile, 0, SEEK_SET)) {
+ fprintf(stderr, "ERROR: Could not seek to start of sig file.\n");
+ goto failure;
+ }
+
+ /* Read in the base64 encoded signature to import */
+ passedInSignatureB64 = malloc(sizeOfBase64EncodedFile + 1);
+ passedInSignatureB64[sizeOfBase64EncodedFile] = '\0';
+ if (fread(passedInSignatureB64, sizeOfBase64EncodedFile, 1, fpSigFile) != 1) {
+ fprintf(stderr, "ERROR: Could read b64 sig file.\n");
+ goto failure;
+ }
+
+ /* Decode the base64 encoded data */
+ passedInSignatureRaw =
+ ATOB_AsciiToData(passedInSignatureB64, &passedInSignatureLenRaw);
+ if (!passedInSignatureRaw) {
+ fprintf(stderr, "ERROR: could not obtain base64 decoded data\n");
+ goto failure;
+ }
+
+ /* Read everything up until the signature block offset and write it out */
+ if (ReadAndWrite(fpSrc, fpDest, buf, SIGNATURE_BLOCK_OFFSET,
+ "signature block offset")) {
+ goto failure;
+ }
+
+ /* Get the number of signatures */
+ if (ReadAndWrite(fpSrc, fpDest, &signatureCount, sizeof(signatureCount),
+ "signature count")) {
+ goto failure;
+ }
+ signatureCount = ntohl(signatureCount);
+ if (signatureCount > MAX_SIGNATURES) {
+ fprintf(stderr, "ERROR: Signature count was out of range\n");
+ goto failure;
+ }
+
+ if (sigIndex >= signatureCount) {
+ fprintf(stderr, "ERROR: Signature index was out of range\n");
+ goto failure;
+ }
+
+ /* Read and write the whole signature block, but if we reach the
+ signature offset, then we should replace it with the specified
+ base64 decoded signature */
+ for (i = 0; i < signatureCount; i++) {
+ /* Read/Write the signature algorithm ID */
+ if (ReadAndWrite(fpSrc, fpDest, &signatureAlgorithmID,
+ sizeof(signatureAlgorithmID), "sig algorithm ID")) {
+ goto failure;
+ }
+
+ /* Read/Write the signature length */
+ if (ReadAndWrite(fpSrc, fpDest, &signatureLen, sizeof(signatureLen),
+ "sig length")) {
+ goto failure;
+ }
+ signatureLen = ntohl(signatureLen);
+
+ /* Get the signature */
+ if (extractedMARSignature) {
+ free(extractedMARSignature);
+ }
+ extractedMARSignature = malloc(signatureLen);
+
+ if (sigIndex == i) {
+ if (passedInSignatureLenRaw != signatureLen) {
+ fprintf(stderr, "ERROR: Signature length must be the same\n");
+ goto failure;
+ }
+
+ if (fread(extractedMARSignature, signatureLen, 1, fpSrc) != 1) {
+ fprintf(stderr, "ERROR: Could not read signature\n");
+ goto failure;
+ }
+
+ if (fwrite(passedInSignatureRaw, passedInSignatureLenRaw, 1, fpDest) !=
+ 1) {
+ fprintf(stderr, "ERROR: Could not write signature\n");
+ goto failure;
+ }
+ } else {
+ if (ReadAndWrite(fpSrc, fpDest, extractedMARSignature, signatureLen,
+ "signature")) {
+ goto failure;
+ }
+ }
+ }
+
+ /* We replaced the signature so let's just skip past the rest o the
+ file. */
+ numChunks = (sizeOfSrcMAR - ftello(fpSrc)) / BLOCKSIZE;
+ leftOver = (sizeOfSrcMAR - ftello(fpSrc)) % BLOCKSIZE;
+
+ /* Read each file and write it to the MAR file */
+ for (i = 0; i < numChunks; ++i) {
+ if (ReadAndWrite(fpSrc, fpDest, buf, BLOCKSIZE, "content block")) {
+ goto failure;
+ }
+ }
+
+ if (ReadAndWrite(fpSrc, fpDest, buf, leftOver, "left over content block")) {
+ goto failure;
+ }
+
+ rv = 0;
+
+failure:
+
+ if (fpSrc) {
+ fclose(fpSrc);
+ }
+
+ if (fpDest) {
+ fclose(fpDest);
+ }
+
+ if (fpSigFile) {
+ fclose(fpSigFile);
+ }
+
+ if (rv) {
+ remove(dest);
+ }
+
+ if (extractedMARSignature) {
+ free(extractedMARSignature);
+ }
+
+ if (passedInSignatureB64) {
+ free(passedInSignatureB64);
+ }
+
+ if (passedInSignatureRaw) {
+ PORT_Free(passedInSignatureRaw);
+ }
+
+ return rv;
+}
+
+/**
+ * Writes out a copy of the MAR at src but with embedded signatures.
+ * The passed in MAR file must not already be signed or an error will
+ * be returned.
+ *
+ * @param NSSConfigDir The NSS directory containing the private key for
+ * signing
+ * @param certNames The nicknames of the certificate to use for signing
+ * @param certCount The number of certificate names contained in certNames.
+ * One signature will be produced for each certificate.
+ * @param src The path of the source MAR file to sign
+ * @param dest The path of the MAR file to write out that is signed
+ * @return 0 on success
+ * -1 on error
+ */
+int mar_repackage_and_sign(const char* NSSConfigDir,
+ const char* const* certNames, uint32_t certCount,
+ const char* src, const char* dest) {
+ uint32_t offsetToIndex, dstOffsetToIndex, indexLength, leftOver,
+ signatureAlgorithmID, numSignatures = 0, signatureSectionLength = 0;
+ uint32_t signatureLengths[MAX_SIGNATURES];
+ int64_t oldPos, numChunks, i, realSizeOfSrcMAR, signaturePlaceholderOffset,
+ numBytesToCopy, sizeOfEntireMAR = 0;
+ FILE *fpSrc = NULL, *fpDest = NULL;
+ int rv = -1, hasSignatureBlock;
+ SGNContext* ctxs[MAX_SIGNATURES];
+ SECItem secItems[MAX_SIGNATURES];
+ char buf[BLOCKSIZE];
+ SECKEYPrivateKey* privKeys[MAX_SIGNATURES];
+ CERTCertificate* certs[MAX_SIGNATURES];
+ char* indexBuf = NULL;
+ uint32_t k;
+
+ memset(signatureLengths, 0, sizeof(signatureLengths));
+ memset(ctxs, 0, sizeof(ctxs));
+ memset(secItems, 0, sizeof(secItems));
+ memset(privKeys, 0, sizeof(privKeys));
+ memset(certs, 0, sizeof(certs));
+
+ if (!NSSConfigDir || !certNames || certCount == 0 || !src || !dest) {
+ fprintf(stderr, "ERROR: Invalid parameter passed in.\n");
+ return -1;
+ }
+
+ if (NSSInitCryptoContext(NSSConfigDir)) {
+ fprintf(stderr, "ERROR: Could not init config dir: %s\n", NSSConfigDir);
+ goto failure;
+ }
+
+ PK11_SetPasswordFunc(SECU_GetModulePassword);
+
+ fpSrc = fopen(src, "rb");
+ if (!fpSrc) {
+ fprintf(stderr, "ERROR: could not open source file: %s\n", src);
+ goto failure;
+ }
+
+ fpDest = fopen(dest, "wb");
+ if (!fpDest) {
+ fprintf(stderr, "ERROR: could not create target file: %s\n", dest);
+ goto failure;
+ }
+
+ /* Determine if the source MAR file has the new fields for signing or not */
+ if (get_mar_file_info(src, &hasSignatureBlock, NULL, NULL, NULL, NULL)) {
+ fprintf(stderr, "ERROR: could not determine if MAR is old or new.\n");
+ goto failure;
+ }
+
+ for (k = 0; k < certCount; k++) {
+ if (NSSSignBegin(certNames[k], &ctxs[k], &privKeys[k], &certs[k],
+ &signatureLengths[k])) {
+ fprintf(stderr, "ERROR: NSSSignBegin failed\n");
+ goto failure;
+ }
+ }
+
+ /* MAR ID */
+ if (ReadWriteAndUpdateSignatures(fpSrc, fpDest, buf, MAR_ID_SIZE, ctxs,
+ certCount, "MAR ID")) {
+ goto failure;
+ }
+
+ /* Offset to index */
+ if (fread(&offsetToIndex, sizeof(offsetToIndex), 1, fpSrc) != 1) {
+ fprintf(stderr, "ERROR: Could not read offset\n");
+ goto failure;
+ }
+ offsetToIndex = ntohl(offsetToIndex);
+
+ /* Get the real size of the MAR */
+ oldPos = ftello(fpSrc);
+ if (fseeko(fpSrc, 0, SEEK_END)) {
+ fprintf(stderr, "ERROR: Could not seek to end of file.\n");
+ goto failure;
+ }
+ realSizeOfSrcMAR = ftello(fpSrc);
+ if (fseeko(fpSrc, oldPos, SEEK_SET)) {
+ fprintf(stderr, "ERROR: Could not seek back to current location.\n");
+ goto failure;
+ }
+
+ if (hasSignatureBlock) {
+ /* Get the MAR length and adjust its size */
+ if (fread(&sizeOfEntireMAR, sizeof(sizeOfEntireMAR), 1, fpSrc) != 1) {
+ fprintf(stderr, "ERROR: Could read mar size\n");
+ goto failure;
+ }
+ sizeOfEntireMAR = NETWORK_TO_HOST64(sizeOfEntireMAR);
+ if (sizeOfEntireMAR != realSizeOfSrcMAR) {
+ fprintf(stderr, "ERROR: Source MAR is not of the right size\n");
+ goto failure;
+ }
+
+ /* Get the num signatures in the source file */
+ if (fread(&numSignatures, sizeof(numSignatures), 1, fpSrc) != 1) {
+ fprintf(stderr, "ERROR: Could read num signatures\n");
+ goto failure;
+ }
+ numSignatures = ntohl(numSignatures);
+
+ /* We do not support resigning, if you have multiple signatures,
+ you must add them all at the same time. */
+ if (numSignatures) {
+ fprintf(stderr, "ERROR: MAR is already signed\n");
+ goto failure;
+ }
+ } else {
+ sizeOfEntireMAR = realSizeOfSrcMAR;
+ }
+
+ if (((int64_t)offsetToIndex) > sizeOfEntireMAR) {
+ fprintf(stderr, "ERROR: Offset to index is larger than the file size.\n");
+ goto failure;
+ }
+
+ /* Calculate the total signature block length */
+ for (k = 0; k < certCount; k++) {
+ signatureSectionLength += sizeof(signatureAlgorithmID) +
+ sizeof(signatureLengths[k]) + signatureLengths[k];
+ }
+ dstOffsetToIndex = offsetToIndex;
+ if (!hasSignatureBlock) {
+ dstOffsetToIndex += sizeof(sizeOfEntireMAR) + sizeof(numSignatures);
+ }
+ dstOffsetToIndex += signatureSectionLength;
+
+ /* Write out the index offset */
+ dstOffsetToIndex = htonl(dstOffsetToIndex);
+ if (WriteAndUpdateSignatures(fpDest, &dstOffsetToIndex,
+ sizeof(dstOffsetToIndex), ctxs, certCount,
+ "index offset")) {
+ goto failure;
+ }
+ dstOffsetToIndex = ntohl(dstOffsetToIndex);
+
+ /* Write out the new MAR file size */
+ sizeOfEntireMAR += signatureSectionLength;
+ if (!hasSignatureBlock) {
+ sizeOfEntireMAR += sizeof(sizeOfEntireMAR) + sizeof(numSignatures);
+ }
+
+ /* Write out the MAR size */
+ sizeOfEntireMAR = HOST_TO_NETWORK64(sizeOfEntireMAR);
+ if (WriteAndUpdateSignatures(fpDest, &sizeOfEntireMAR,
+ sizeof(sizeOfEntireMAR), ctxs, certCount,
+ "size of MAR")) {
+ goto failure;
+ }
+ sizeOfEntireMAR = NETWORK_TO_HOST64(sizeOfEntireMAR);
+
+ /* Write out the number of signatures */
+ numSignatures = certCount;
+ numSignatures = htonl(numSignatures);
+ if (WriteAndUpdateSignatures(fpDest, &numSignatures, sizeof(numSignatures),
+ ctxs, certCount, "num signatures")) {
+ goto failure;
+ }
+ numSignatures = ntohl(numSignatures);
+
+ signaturePlaceholderOffset = ftello(fpDest);
+
+ for (k = 0; k < certCount; k++) {
+ /* Write out the signature algorithm ID, Only an ID of 2 is supported */
+ signatureAlgorithmID = htonl(2);
+ if (WriteAndUpdateSignatures(fpDest, &signatureAlgorithmID,
+ sizeof(signatureAlgorithmID), ctxs, certCount,
+ "num signatures")) {
+ goto failure;
+ }
+ signatureAlgorithmID = ntohl(signatureAlgorithmID);
+
+ /* Write out the signature length */
+ signatureLengths[k] = htonl(signatureLengths[k]);
+ if (WriteAndUpdateSignatures(fpDest, &signatureLengths[k],
+ sizeof(signatureLengths[k]), ctxs, certCount,
+ "signature length")) {
+ goto failure;
+ }
+ signatureLengths[k] = ntohl(signatureLengths[k]);
+
+ /* Write out a placeholder for the signature, we'll come back to this later
+ *** THIS IS NOT SIGNED because it is a placeholder that will be replaced
+ below, plus it is going to be the signature itself. *** */
+ memset(buf, 0, sizeof(buf));
+ if (fwrite(buf, signatureLengths[k], 1, fpDest) != 1) {
+ fprintf(stderr, "ERROR: Could not write signature length\n");
+ goto failure;
+ }
+ }
+
+ /* Write out the rest of the MAR excluding the index header and index
+ offsetToIndex unfortunately has to remain 32-bit because for backwards
+ compatibility with the old MAR file format. */
+ if (ftello(fpSrc) > ((int64_t)offsetToIndex)) {
+ fprintf(stderr, "ERROR: Index offset is too small.\n");
+ goto failure;
+ }
+ numBytesToCopy = ((int64_t)offsetToIndex) - ftello(fpSrc);
+ numChunks = numBytesToCopy / BLOCKSIZE;
+ leftOver = numBytesToCopy % BLOCKSIZE;
+
+ /* Read each file and write it to the MAR file */
+ for (i = 0; i < numChunks; ++i) {
+ if (ReadWriteAndUpdateSignatures(fpSrc, fpDest, buf, BLOCKSIZE, ctxs,
+ certCount, "content block")) {
+ goto failure;
+ }
+ }
+
+ /* Write out the left over */
+ if (ReadWriteAndUpdateSignatures(fpSrc, fpDest, buf, leftOver, ctxs,
+ certCount, "left over content block")) {
+ goto failure;
+ }
+
+ /* Length of the index */
+ if (ReadWriteAndUpdateSignatures(fpSrc, fpDest, &indexLength,
+ sizeof(indexLength), ctxs, certCount,
+ "index length")) {
+ goto failure;
+ }
+ indexLength = ntohl(indexLength);
+
+ /* Consume the index and adjust each index by signatureSectionLength */
+ indexBuf = malloc(indexLength);
+ if (fread(indexBuf, indexLength, 1, fpSrc) != 1) {
+ fprintf(stderr, "ERROR: Could not read index\n");
+ goto failure;
+ }
+
+ /* Adjust each entry in the index */
+ if (hasSignatureBlock) {
+ AdjustIndexContentOffsets(indexBuf, indexLength, signatureSectionLength);
+ } else {
+ AdjustIndexContentOffsets(indexBuf, indexLength,
+ sizeof(sizeOfEntireMAR) + sizeof(numSignatures) +
+ signatureSectionLength);
+ }
+
+ if (WriteAndUpdateSignatures(fpDest, indexBuf, indexLength, ctxs, certCount,
+ "index")) {
+ goto failure;
+ }
+
+ /* Ensure that we don't sign a file that is too large to be accepted by
+ the verification function. */
+ if (ftello(fpDest) > MAX_SIZE_OF_MAR_FILE) {
+ goto failure;
+ }
+
+ for (k = 0; k < certCount; k++) {
+ /* Get the signature */
+ if (SGN_End(ctxs[k], &secItems[k]) != SECSuccess) {
+ fprintf(stderr, "ERROR: Could not end signature context\n");
+ goto failure;
+ }
+ if (signatureLengths[k] != secItems[k].len) {
+ fprintf(stderr, "ERROR: Signature is not the expected length\n");
+ goto failure;
+ }
+ }
+
+ /* Get back to the location of the signature placeholder */
+ if (fseeko(fpDest, signaturePlaceholderOffset, SEEK_SET)) {
+ fprintf(stderr, "ERROR: Could not seek to signature offset\n");
+ goto failure;
+ }
+
+ for (k = 0; k < certCount; k++) {
+ /* Skip to the position of the next signature */
+ if (fseeko(fpDest,
+ sizeof(signatureAlgorithmID) + sizeof(signatureLengths[k]),
+ SEEK_CUR)) {
+ fprintf(stderr, "ERROR: Could not seek to signature offset\n");
+ goto failure;
+ }
+
+ /* Write out the calculated signature.
+ *** THIS IS NOT SIGNED because it is the signature itself. *** */
+ if (fwrite(secItems[k].data, secItems[k].len, 1, fpDest) != 1) {
+ fprintf(stderr, "ERROR: Could not write signature\n");
+ goto failure;
+ }
+ }
+
+ rv = 0;
+failure:
+ if (fpSrc) {
+ fclose(fpSrc);
+ }
+
+ if (fpDest) {
+ fclose(fpDest);
+ }
+
+ if (rv) {
+ remove(dest);
+ }
+
+ if (indexBuf) {
+ free(indexBuf);
+ }
+
+ /* Cleanup */
+ for (k = 0; k < certCount; k++) {
+ if (ctxs[k]) {
+ SGN_DestroyContext(ctxs[k], PR_TRUE);
+ }
+
+ if (certs[k]) {
+ CERT_DestroyCertificate(certs[k]);
+ }
+
+ if (privKeys[k]) {
+ SECKEY_DestroyPrivateKey(privKeys[k]);
+ }
+
+ SECITEM_FreeItem(&secItems[k], PR_FALSE);
+ }
+
+ (void)NSS_Shutdown();
+
+ if (rv) {
+ remove(dest);
+ }
+
+ return rv;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-05 02:11:52 +0000