/**
* Compute the SHA1 hash for the given file.
* @param filename The filename (with or without prefixed by a path). If the file
* is not found the exeption 'FileNotFoundException' is thrown.
* @param bufferSize The size of the buffer used to give the data to 'QCryptographicHash'.
* @return The sha1 hash.
*/
QByteArray computeSHA1(const QString& filename, qint32 bufferSize)
throw (FileNotFoundException)
{
#if not WITH_SHA1_LINUS
QCryptographicHash crypto(QCryptographicHash::Sha1);
#endif
QFile file(filename);
if (!file.open(QIODevice::ReadOnly))
throw FileNotFoundException();
#if WITH_SHA1_LINUS
blk_SHA_CTX sha1State;
blk_SHA1_Init(&sha1State);
unsigned char bufferHash[20];
#endif
char buffer[bufferSize];
qint64 bytesRead = 0;
while ((bytesRead = file.read(buffer, bufferSize)) > 0)
{
#if WITH_SHA1_LINUS
blk_SHA1_Update(&sha1State, buffer, bytesRead);
#else
crypto.addData(buffer, bytesRead);
#endif
}
#if WITH_SHA1_LINUS
blk_SHA1_Final(bufferHash, &sha1State);
return QByteArray((const char*)bufferHash, 20);
#else
return crypto.result();
#endif
}
/*
* Write a portion of a blob to local storage and derive a partial digest.
* Return 1 if the accumulated digest matches the expected digest,
* 0 if the partial digest does not match do not match.
*/
static int
eat_chunk(struct request *r, blk_SHA_CTX *p_ctx, int fd, unsigned char *buf,
int buf_size)
{
struct sha_fs_request *sp = (struct sha_fs_request *)r->open_data;
blk_SHA_CTX ctx;
unsigned char digest[20];
/*
* Update the incremental digest.
*/
blk_SHA1_Update(p_ctx, buf, buf_size);
/*
* Write the chunk to the local temp file.
*/
if (io_write_buf(fd, buf, buf_size))
_panic2(r, "eat_chunk: write(tmp) failed", strerror(errno));
/*
* Determine if we have seen the whole blob
* by copying the incremental digest, finalizing it,
* then comparing to the expected blob.
*/
memcpy(&ctx, p_ctx, sizeof *p_ctx);
blk_SHA1_Final(digest, &ctx);
return memcmp(sp->digest, digest, 20) == 0 ? 1 : 0;
}
uint8_t *SHA_final(SHA_CTX *ctx)
{
unsigned char hashout[20];
blk_SHA1_Final(hashout, ctx);
ftl_memcpy(ctx->H, hashout, sizeof(ctx->H));
return (uint8_t *)ctx->H;
}
void SHA1_Encrypt(const unsigned char *pszMessage, unsigned int uPlainTextLen, unsigned char *pszDigest)
{
blk_SHA_CTX ctx;
blk_SHA1_Init(&ctx);
blk_SHA1_Update(&ctx, pszMessage, uPlainTextLen);
blk_SHA1_Final(pszDigest, &ctx);
}
void SHA1_EncryptLR(const unsigned char *pszMessageL, const unsigned char *pszMessageR, unsigned char *pszDigest)
{
//char empty[SHA1_DIGEST_BLOCKLEN] = { 0, };
//if (!memcmp(pszMessageL, empty, SHA1_DIGEST_BLOCKLEN) && !memcmp(pszMessageR, empty, SHA1_DIGEST_BLOCKLEN)) return;
blk_SHA_CTX ctx;
blk_SHA1_Init(&ctx);
blk_SHA1_Update(&ctx, pszMessageL, SHA1_DIGEST_BLOCKLEN);
blk_SHA1_Update(&ctx, pszMessageR, SHA1_DIGEST_BLOCKLEN);
blk_SHA1_Final(pszDigest, &ctx);
}
/**
* Compute some SHA1 hash for each chunk of the given file.
* @param filename The filename (with or without prefixed by a path). If the file
* is not found the exeption 'FileNotFoundException' is thrown.
* @param chunkSize The size of each chunk. It must be a divisor of 'bufferSizer'.
* @param bufferSize The size of the buffer used to give the data to 'QCryptographicHash'.
* @return A list of chunk hashes.
*/
QList<QByteArray> computeMultiSHA1(const QString& filename, qint32 chunkSize, qint32 bufferSize)
throw (FileNotFoundException)
{
QList<QByteArray> result;
#if not WITH_SHA1_LINUS
QCryptographicHash crypto(QCryptographicHash::Sha1);
#endif
QFile file(filename);
if (!file.open(QIODevice::ReadOnly))
throw FileNotFoundException();
#if WITH_SHA1_LINUS
blk_SHA_CTX sha1State;
unsigned char bufferHash[20];
#endif
char buffer[bufferSize];
bool endOfFile = false;
while (!endOfFile)
{
#if WITH_SHA1_LINUS
blk_SHA1_Init(&sha1State);
#endif
qint64 bytesReadTotal = 0;
while (bytesReadTotal < chunkSize)
{
qint64 bytesRead = file.read(buffer, bufferSize);
if (bytesRead == 0)
{
endOfFile = true;
break;
}
#if WITH_SHA1_LINUS
blk_SHA1_Update(&sha1State, buffer, bytesRead);
#else
crypto.addData(buffer, bytesRead);
#endif
bytesReadTotal += bytesRead;
}
#if WITH_SHA1_LINUS
blk_SHA1_Final(bufferHash, &sha1State);
result.append(QByteArray((const char*)bufferHash, 20));
#else
result.append(crypto.result());
crypto.reset();
#endif
}
return result;
}
uint64_t ccv_cache_generate_signature(const char* msg, int len, uint64_t sig_start, ...)
{
blk_SHA_CTX ctx;
blk_SHA1_Init(&ctx);
uint64_t sigi;
va_list arguments;
va_start(arguments, sig_start);
for (sigi = sig_start; sigi != 0; sigi = va_arg(arguments, uint64_t))
blk_SHA1_Update(&ctx, &sigi, 8);
va_end(arguments);
blk_SHA1_Update(&ctx, msg, len);
union {
uint64_t u;
uint8_t chr[20];
} sig;
blk_SHA1_Final(sig.chr, &ctx);
return sig.u;
}
/*
* calculate a sha1 hash of the contents of all config files
* sorted by their full path.
* *hash must hold at least 20 bytes
*/
int get_config_hash(unsigned char *hash)
{
struct file_list **sorted_flist;
unsigned int num_files = 0, i = 0;
blk_SHA_CTX ctx;
blk_SHA1_Init(&ctx);
sorted_flist = get_sorted_oconf_files(&num_files);
for (i = 0; i < num_files; i++) {
hash_add_file(sorted_flist[i]->name, &ctx);
sorted_flist[i]->next = NULL;
file_list_free(sorted_flist[i]);
}
blk_SHA1_Final(hash, &ctx);
free(sorted_flist);
return 0;
}
char *hashtree_compute(HashTreeNode * tree)
{
unsigned int i = 0;
char *hash;
void *bhash;
blk_SHA_CTX ctx;
assert(tree != NULL);
/* precomputed */
if (tree->hash != NULL)
return (char *)tree->hash;
/* space for binary hash */
bhash = smalloc(20 * sizeof(unsigned char));
/* get some memory to store the hex and bin representation */
hash = smalloc(41 * sizeof(char));
/* initialize */
blk_SHA1_Init(&ctx);
for (i = 0; IS_VALID_CHILD(tree, i); i++) {
if (!IS_LEAF(tree, i))
tree->children[i]->hash = hashtree_compute(tree->children[i]);
blk_SHA1_Update(&ctx, tree->children[i]->hash, 40);
}
blk_SHA1_Final((unsigned char *)bhash, &ctx);
/* generate hex representation. binary hash is *big endian* */
sprintf(hash, "%08x%08x%08x%08x%08x", PIECE(0), PIECE(1), PIECE(2),
PIECE(3), PIECE(4));
free(bhash);
tree->hash = hash;
return hash;
}
/*
* Digest a local blob stream and store the digested blob.
*/
static int
sha_fs_digest(struct request *r, int fd, char *hex_digest, int do_put)
{
char unsigned buf[4096], digest[20], *d, *d_end;
char *h;
blk_SHA_CTX ctx;
int nread;
int tmp_fd = -1;
char tmp_path[MAX_FILE_PATH_LEN];
int status = 0;
tmp_path[0] = 0;
if (do_put) {
static int drift = 0;
if (drift++ >= 999)
drift = 0;
/*
* Open a temporary file in $sha_fs_root/tmp to accumulate the
* blob read from the stream. The file looks like
*
* digest-time-pid-drift
*/
snprintf(tmp_path, sizeof tmp_path, "%s/digest-%d-%u-%d",
boot_data.tmp_dir_path,
/*
* Warning:
* Casting time() to int is
* incorrect!!
*/
(int)time((time_t *)0),
getpid(), drift);
/*
* Open the file ... need O_LARGEFILE support!!
* Need to catch EINTR!!!!
*/
tmp_fd = io_open(tmp_path, O_CREAT|O_EXCL|O_WRONLY|O_APPEND,
S_IRUSR);
if (tmp_fd < 0)
_panic3(r, "digest: open(tmp) failed", tmp_path,
strerror(errno));
}
blk_SHA1_Init(&ctx);
while ((nread = io_read(fd, buf, sizeof buf)) > 0) {
blk_SHA1_Update(&ctx, buf, nread);
if (do_put && io_write_buf(tmp_fd, buf, nread) != 0)
_panic2(r, "digest: write_buf(tmp) failed",
strerror(errno));
}
if (nread < 0) {
_error(r, "digest: _read() failed");
goto croak;
}
blk_SHA1_Final(digest, &ctx);
if (do_put) {
status = io_close(tmp_fd);
tmp_fd = -1;
if (status)
_panic2(r,"digest: close(tmp) failed",strerror(errno));
}
/*
* Convert the binary sha digest to text.
*/
h = hex_digest;
d = digest;
d_end = d + 20;
while (d < d_end) {
*h++ = nib2hex[(*d & 0xf0) >> 4];
*h++ = nib2hex[*d & 0xf];
d++;
}
*h = 0;
/*
* Move the blob from the temporary file to the blob file.
*/
if (do_put) {
blob_path(r, hex_digest);
arbor_rename(tmp_path,
((struct sha_fs_request *)r->open_data)->blob_path);
tmp_path[0] = 0;
}
goto cleanup;
croak:
status = -1;
cleanup:
if (tmp_fd > -1 && io_close(tmp_fd))
_panic2(r, "digest: close(tmp) failed", strerror(errno));
if (tmp_path[0] && io_unlink(tmp_path))
_panic3(r, "digest: unlink(tmp) failed", tmp_path,
strerror(errno));
return status;
}
static int
sha_fs_eat(struct request *r)
{
struct sha_fs_request *sp = (struct sha_fs_request *)r->open_data;
int status = 0;
blk_SHA_CTX ctx;
unsigned char digest[20];
int fd;
unsigned char chunk[CHUNK_SIZE];
int nread;
blob_path(r, r->digest);
/*
* Open the file to the blob.
*/
switch (_open(r, sp->blob_path, &fd)) {
case 0:
break;
/*
* Blob not found.
*/
case ENOENT:
return 1;
default:
_panic(r, "_open(blob) failed");
}
blk_SHA1_Init(&ctx);
/*
* Read a chunk from the file and chew.
*/
while ((nread = _read(r, fd, chunk, sizeof chunk)) > 0)
/*
* Update the incremental digest.
*/
blk_SHA1_Update(&ctx, chunk, nread);
if (nread < 0)
_panic(r, "_read(blob) failed");
/*
* Finalize the digest.
*/
blk_SHA1_Final(digest, &ctx);
/*
* If the calculated digest does NOT match the stored digest,
* then zap the blob from storage and get panicy.
* A corrupt blob is a bad, bad thang.
*
* Note: unfortunately we've already deceived the client
* by sending "ok". Probably need to improve for
* the special case when the entire blob is read
* in first chunk.
*/
if (memcmp(sp->digest, digest, 20))
_panic2(r, "stored blob doesn't match digest", r->digest);
if (_close(r, &fd))
_panic(r, "_close(blob) failed");
return status;
}
/*
* Copy a local blob to a local stream.
*
* Return 0 if stream matches signature, -1 otherwise.
* Note: this needs to be folded into sha_fs_get().
*/
static int
sha_fs_copy(struct request *r, int out_fd)
{
struct sha_fs_request *sp = (struct sha_fs_request *)r->open_data;
int status = 0;
blk_SHA_CTX ctx;
unsigned char digest[20];
int fd;
unsigned char chunk[CHUNK_SIZE];
int nread;
static char n[] = "sha_fs_write";
blob_path(r, r->digest);
/*
* Open the file to the blob.
*/
switch (_open(r, sp->blob_path, &fd)) {
case 0:
break;
case ENOENT:
_warn3(r, n, "open(blob): not found", r->digest);
return 1;
default:
_panic2(r, n, "_open(blob) failed");
}
blk_SHA1_Init(&ctx);
/*
* Read a chunk from the file, write chunk to local stream,
* update incremental digest.
*/
while ((nread = _read(r, fd, chunk, sizeof chunk)) > 0) {
if (io_write_buf(out_fd, chunk, nread)) {
_error2(r, n, "write_buf() failed");
goto croak;
}
/*
* Update the incremental digest.
*/
blk_SHA1_Update(&ctx, chunk, nread);
}
if (nread < 0)
_panic2(r, n, "_read(blob) failed");
/*
* Finalize the digest.
*/
blk_SHA1_Final(digest, &ctx);
/*
* If the calculated digest does NOT match the stored digest,
* then zap the blob from storage and get panicy.
* A corrupt blob is a bad, bad thang.
*/
if (memcmp(sp->digest, digest, 20))
_panic3(r, n, "stored blob doesn't match digest", r->digest);
goto cleanup;
croak:
status = -1;
cleanup:
if (_close(r, &fd))
_panic2(r, n, "_close(blob) failed");
return status;
}
static int
sha_fs_get(struct request *r)
{
struct sha_fs_request *sp = (struct sha_fs_request *)r->open_data;
int status = 0;
blk_SHA_CTX ctx;
unsigned char digest[20];
int fd;
unsigned char chunk[CHUNK_SIZE];
int nread;
blob_path(r, r->digest);
/*
* Open the file to the blob.
*/
switch (_open(r, sp->blob_path, &fd)) {
case 0:
break;
case ENOENT:
return 1;
default:
_panic(r, "_open(blob) failed");
}
/*
* Tell the client we have the blob.
*/
if (write_ok(r)) {
_error(r, "write_ok() failed");
goto croak;
}
blk_SHA1_Init(&ctx);
/*
* Read a chunk from the file, write chunk to client,
* update incremental digest.
*
* In principle, we ought to first scan the blob file
* before sending "ok" to the requestor.
*/
while ((nread = _read(r, fd, chunk, sizeof chunk)) > 0) {
if (blob_write(r, chunk, nread)) {
_error(r, "blob_write(blob chunk) failed");
goto croak;
}
/*
* Update the incremental digest.
*/
blk_SHA1_Update(&ctx, chunk, nread);
}
if (nread < 0)
_panic(r, "_read(blob) failed");
/*
* Finalize the digest.
*/
blk_SHA1_Final(digest, &ctx);
/*
* If the calculated digest does NOT match the stored digest,
* then zap the blob from storage and get panicy.
* A corrupt blob is a bad, bad thang.
*
* Note: unfortunately we've already deceived the client
* by sending "ok". Probably need to improve for
* the special case when the entire blob is read
* in first chunk.
*/
if (memcmp(sp->digest, digest, 20)) {
_error2(r, "PANIC: stored blob doesn't match digest",
r->digest);
if (zap_blob(r))
_panic(r, "zap_blob() failed");
goto croak;
}
goto cleanup;
croak:
status = -1;
cleanup:
if (_close(r, &fd))
_panic(r, "_close(blob) failed");
return status;
}