/***************************************
* CABD_READ_HEADERS
***************************************
* reads the cabinet file header, folder list and file list.
* fills out a pre-existing mscabd_cabinet structure, allocates memory
* for folders and files as necessary
*/
static int cabd_read_headers(struct mspack_system *sys,
struct mspack_file *fh,
struct mscabd_cabinet_p *cab,
off_t offset, int quiet)
{
int num_folders, num_files, folder_resv, i, x;
struct mscabd_folder_p *fol, *linkfol = NULL;
struct mscabd_file *file, *linkfile = NULL;
unsigned char buf[64];
/* initialise pointers */
cab->base.next = NULL;
cab->base.files = NULL;
cab->base.folders = NULL;
cab->base.prevcab = cab->base.nextcab = NULL;
cab->base.prevname = cab->base.nextname = NULL;
cab->base.previnfo = cab->base.nextinfo = NULL;
cab->base.base_offset = offset;
/* seek to CFHEADER */
if (sys->seek(fh, offset, MSPACK_SYS_SEEK_START)) {
return MSPACK_ERR_SEEK;
}
/* read in the CFHEADER */
if (sys->read(fh, &buf[0], cfhead_SIZEOF) != cfhead_SIZEOF) {
return MSPACK_ERR_READ;
}
/* check for "MSCF" signature */
if (EndGetI32(&buf[cfhead_Signature]) != 0x4643534D) {
return MSPACK_ERR_SIGNATURE;
}
/* some basic header fields */
cab->base.length = EndGetI32(&buf[cfhead_CabinetSize]);
cab->base.set_id = EndGetI16(&buf[cfhead_SetID]);
cab->base.set_index = EndGetI16(&buf[cfhead_CabinetIndex]);
/* get the number of folders */
num_folders = EndGetI16(&buf[cfhead_NumFolders]);
if (num_folders == 0) {
if (!quiet) sys->message(fh, "no folders in cabinet.");
return MSPACK_ERR_DATAFORMAT;
}
/* get the number of files */
num_files = EndGetI16(&buf[cfhead_NumFiles]);
if (num_files == 0) {
if (!quiet) sys->message(fh, "no files in cabinet.");
return MSPACK_ERR_DATAFORMAT;
}
/* check cabinet version */
if ((buf[cfhead_MajorVersion] != 1) && (buf[cfhead_MinorVersion] != 3)) {
if (!quiet) sys->message(fh, "WARNING; cabinet version is not 1.3");
}
/* read the reserved-sizes part of header, if present */
cab->base.flags = EndGetI16(&buf[cfhead_Flags]);
if (cab->base.flags & cfheadRESERVE_PRESENT) {
if (sys->read(fh, &buf[0], cfheadext_SIZEOF) != cfheadext_SIZEOF) {
return MSPACK_ERR_READ;
}
cab->base.header_resv = EndGetI16(&buf[cfheadext_HeaderReserved]);
folder_resv = buf[cfheadext_FolderReserved];
cab->block_resv = buf[cfheadext_DataReserved];
if (cab->base.header_resv > 60000) {
if (!quiet) sys->message(fh, "WARNING; reserved header > 60000.");
}
/* skip the reserved header */
if (cab->base.header_resv) {
if (sys->seek(fh, (off_t) cab->base.header_resv, MSPACK_SYS_SEEK_CUR)) {
return MSPACK_ERR_SEEK;
}
}
}
else {
cab->base.header_resv = 0;
folder_resv = 0;
cab->block_resv = 0;
}
/* read name and info of preceeding cabinet in set, if present */
if (cab->base.flags & cfheadPREV_CABINET) {
cab->base.prevname = cabd_read_string(sys, fh, cab, &x); if (x) return x;
cab->base.previnfo = cabd_read_string(sys, fh, cab, &x); if (x) return x;
}
/* read name and info of next cabinet in set, if present */
if (cab->base.flags & cfheadNEXT_CABINET) {
cab->base.nextname = cabd_read_string(sys, fh, cab, &x); if (x) return x;
cab->base.nextinfo = cabd_read_string(sys, fh, cab, &x); if (x) return x;
}
/* read folders */
for (i = 0; i < num_folders; i++) {
if (sys->read(fh, &buf[0], cffold_SIZEOF) != cffold_SIZEOF) {
return MSPACK_ERR_READ;
}
if (folder_resv) {
if (sys->seek(fh, (off_t) folder_resv, MSPACK_SYS_SEEK_CUR)) {
return MSPACK_ERR_SEEK;
}
}
if (!(fol = sys->alloc(sys, sizeof(struct mscabd_folder_p)))) {
return MSPACK_ERR_NOMEMORY;
}
fol->base.next = NULL;
fol->base.comp_type = EndGetI16(&buf[cffold_CompType]);
fol->base.num_blocks = EndGetI16(&buf[cffold_NumBlocks]);
fol->data.next = NULL;
fol->data.cab = (struct mscabd_cabinet_p *) cab;
fol->data.offset = offset + (off_t)
( (unsigned int) EndGetI32(&buf[cffold_DataOffset]) );
fol->merge_prev = NULL;
fol->merge_next = NULL;
/* link folder into list of folders */
if (!linkfol) cab->base.folders = (struct mscabd_folder *) fol;
else linkfol->base.next = (struct mscabd_folder *) fol;
linkfol = fol;
}
/* read files */
for (i = 0; i < num_files; i++) {
if (sys->read(fh, &buf[0], cffile_SIZEOF) != cffile_SIZEOF) {
return MSPACK_ERR_READ;
}
if (!(file = sys->alloc(sys, sizeof(struct mscabd_file)))) {
return MSPACK_ERR_NOMEMORY;
}
file->next = NULL;
file->length = EndGetI32(&buf[cffile_UncompressedSize]);
file->attribs = EndGetI16(&buf[cffile_Attribs]);
file->offset = EndGetI32(&buf[cffile_FolderOffset]);
/* set folder pointer */
x = EndGetI16(&buf[cffile_FolderIndex]);
if (x < cffileCONTINUED_FROM_PREV) {
/* normal folder index; count up to the correct folder. the folder
* pointer will be NULL if folder index is invalid */
struct mscabd_folder *ifol = cab->base.folders;
while (x--) if (ifol) ifol = ifol->next;
file->folder = ifol;
if (!ifol) {
sys->free(file);
D(("invalid folder index"))
return MSPACK_ERR_DATAFORMAT;
}
}
else {
/* either CONTINUED_TO_NEXT, CONTINUED_FROM_PREV or
* CONTINUED_PREV_AND_NEXT */
if ((x == cffileCONTINUED_TO_NEXT) ||
static BOOL WINTRUST_GetSignedMsgFromCabFile(SIP_SUBJECTINFO *pSubjectInfo,
DWORD *pdwEncodingType, DWORD dwIndex, DWORD *pcbSignedDataMsg,
BYTE *pbSignedDataMsg)
{
int header_resv;
LONG base_offset, cabsize;
USHORT flags;
BYTE buf[64];
DWORD cert_offset, cert_size, dwRead;
TRACE("(%p %p %d %p %p)\n", pSubjectInfo, pdwEncodingType, dwIndex,
pcbSignedDataMsg, pbSignedDataMsg);
/* get basic offset & size info */
base_offset = SetFilePointer(pSubjectInfo->hFile, 0L, NULL, SEEK_CUR);
if (SetFilePointer(pSubjectInfo->hFile, 0, NULL, SEEK_END) == INVALID_SET_FILE_POINTER)
{
TRACE("seek error\n");
return FALSE;
}
cabsize = SetFilePointer(pSubjectInfo->hFile, 0L, NULL, SEEK_CUR);
if ((cabsize == -1) || (base_offset == -1) ||
(SetFilePointer(pSubjectInfo->hFile, 0, NULL, SEEK_SET) == INVALID_SET_FILE_POINTER))
{
TRACE("seek error\n");
return FALSE;
}
/* read in the CFHEADER */
if (!ReadFile(pSubjectInfo->hFile, buf, cfhead_SIZEOF, &dwRead, NULL) ||
dwRead != cfhead_SIZEOF)
{
TRACE("reading header failed\n");
return FALSE;
}
/* check basic MSCF signature */
if (EndGetI32(buf+cfhead_Signature) != 0x4643534d)
{
WARN("cabinet signature not present\n");
return FALSE;
}
/* Ignore the number of folders and files and the set and cabinet IDs */
/* check the header revision */
if ((buf[cfhead_MajorVersion] > 1) ||
(buf[cfhead_MajorVersion] == 1 && buf[cfhead_MinorVersion] > 3))
{
WARN("cabinet format version > 1.3\n");
return FALSE;
}
/* pull the flags out */
flags = EndGetI16(buf+cfhead_Flags);
if (!(flags & cfheadRESERVE_PRESENT))
{
TRACE("no header present, not signed\n");
return FALSE;
}
if (!ReadFile(pSubjectInfo->hFile, buf, cfheadext_SIZEOF, &dwRead, NULL) ||
dwRead != cfheadext_SIZEOF)
{
ERR("bunk reserve-sizes?\n");
return FALSE;
}
header_resv = EndGetI16(buf+cfheadext_HeaderReserved);
if (!header_resv)
{
TRACE("no header_resv, not signed\n");
return FALSE;
}
else if (header_resv < cfsigninfo_SIZEOF)
{
TRACE("header_resv too small, not signed\n");
return FALSE;
}
if (header_resv > 60000)
{
WARN("WARNING; header reserved space > 60000\n");
}
if (!ReadFile(pSubjectInfo->hFile, buf, cfsigninfo_SIZEOF, &dwRead, NULL) ||
dwRead != cfsigninfo_SIZEOF)
{
ERR("couldn't read reserve\n");
return FALSE;
}
cert_offset = EndGetI32(buf+cfsigninfo_CertOffset);
TRACE("cert_offset: %d\n", cert_offset);
cert_size = EndGetI32(buf+cfsigninfo_CertSize);
TRACE("cert_size: %d\n", cert_size);
/* The redundant checks are to avoid wraparound */
if (cert_offset > cabsize || cert_size > cabsize ||
cert_offset + cert_size > cabsize)
{
WARN("offset beyond file, not attempting to read\n");
return FALSE;
}
SetFilePointer(pSubjectInfo->hFile, base_offset, NULL, SEEK_SET);
if (!pbSignedDataMsg)
{
*pcbSignedDataMsg = cert_size;
return TRUE;
}
if (*pcbSignedDataMsg < cert_size)
{
*pcbSignedDataMsg = cert_size;
SetLastError(ERROR_INSUFFICIENT_BUFFER);
return FALSE;
}
if (SetFilePointer(pSubjectInfo->hFile, cert_offset, NULL, SEEK_SET) == INVALID_SET_FILE_POINTER)
{
ERR("couldn't seek to cert location\n");
return FALSE;
}
if (!ReadFile(pSubjectInfo->hFile, pbSignedDataMsg, cert_size, &dwRead,
NULL) || dwRead != cert_size)
{
ERR("couldn't read cert\n");
SetFilePointer(pSubjectInfo->hFile, base_offset, NULL, SEEK_SET);
return FALSE;
}
/* The encoding of the files I've seen appears to be in ASN.1
* format, and there isn't a field indicating the type, so assume it
* always is.
*/
*pdwEncodingType = X509_ASN_ENCODING | PKCS_7_ASN_ENCODING;
/* Restore base offset */
SetFilePointer(pSubjectInfo->hFile, base_offset, NULL, SEEK_SET);
return TRUE;
}
/***************************************
* KWAJD_READ_HEADERS
***************************************
* reads the headers of a KWAJ format file
*/
static int kwajd_read_headers(struct mspack_system *sys,
struct mspack_file *fh,
struct mskwajd_header *hdr)
{
unsigned char buf[16];
int i;
/* read in the header */
if (sys->read(fh, &buf[0], kwajh_SIZEOF) != kwajh_SIZEOF) {
return MSPACK_ERR_READ;
}
/* check for "KWAJ" signature */
if (((unsigned int) EndGetI32(&buf[kwajh_Signature1]) != 0x4A41574B) ||
((unsigned int) EndGetI32(&buf[kwajh_Signature2]) != 0xD127F088))
{
return MSPACK_ERR_SIGNATURE;
}
/* basic header fields */
hdr->comp_type = EndGetI16(&buf[kwajh_CompMethod]);
hdr->data_offset = EndGetI16(&buf[kwajh_DataOffset]);
hdr->headers = EndGetI16(&buf[kwajh_Flags]);
hdr->length = 0;
hdr->filename = NULL;
hdr->extra = NULL;
hdr->extra_length = 0;
/* optional headers */
/* 4 bytes: length of unpacked file */
if (hdr->headers & MSKWAJ_HDR_HASLENGTH) {
if (sys->read(fh, &buf[0], 4) != 4) return MSPACK_ERR_READ;
hdr->length = EndGetI32(&buf[0]);
}
/* 2 bytes: unknown purpose */
if (hdr->headers & MSKWAJ_HDR_HASUNKNOWN1) {
if (sys->read(fh, &buf[0], 2) != 2) return MSPACK_ERR_READ;
}
/* 2 bytes: length of section, then [length] bytes: unknown purpose */
if (hdr->headers & MSKWAJ_HDR_HASUNKNOWN2) {
if (sys->read(fh, &buf[0], 2) != 2) return MSPACK_ERR_READ;
i = EndGetI16(&buf[0]);
if (sys->seek(fh, (off_t)i, MSPACK_SYS_SEEK_CUR)) return MSPACK_ERR_SEEK;
}
/* filename and extension */
if (hdr->headers & (MSKWAJ_HDR_HASFILENAME | MSKWAJ_HDR_HASFILEEXT)) {
off_t pos = sys->tell(fh);
char *fn = (char *) sys->alloc(sys, (size_t) 13);
/* allocate memory for maximum length filename */
if (! fn) return MSPACK_ERR_NOMEMORY;
hdr->filename = fn;
/* copy filename if present */
if (hdr->headers & MSKWAJ_HDR_HASFILENAME) {
if (sys->read(fh, &buf[0], 9) != 9) return MSPACK_ERR_READ;
for (i = 0; i < 9; i++, fn++) if (!(*fn = buf[i])) break;
pos += (i < 9) ? i+1 : 9;
if (sys->seek(fh, pos, MSPACK_SYS_SEEK_START))
return MSPACK_ERR_SEEK;
}
/* copy extension if present */
if (hdr->headers & MSKWAJ_HDR_HASFILEEXT) {
*fn++ = '.';
if (sys->read(fh, &buf[0], 4) != 4) return MSPACK_ERR_READ;
for (i = 0; i < 4; i++, fn++) if (!(*fn = buf[i])) break;
pos += (i < 4) ? i+1 : 4;
if (sys->seek(fh, pos, MSPACK_SYS_SEEK_START))
return MSPACK_ERR_SEEK;
}
*fn = '\0';
}
/* 2 bytes: extra text length then [length] bytes of extra text data */
if (hdr->headers & MSKWAJ_HDR_HASEXTRATEXT) {
if (sys->read(fh, &buf[0], 2) != 2) return MSPACK_ERR_READ;
i = EndGetI16(&buf[0]);
hdr->extra = (char *) sys->alloc(sys, (size_t)i+1);
if (! hdr->extra) return MSPACK_ERR_NOMEMORY;
if (sys->read(fh, hdr->extra, i) != i) return MSPACK_ERR_READ;
hdr->extra[i] = '\0';
hdr->extra_length = i;
}
return MSPACK_ERR_OK;
}
static int cabd_sys_read_block(struct mspack_system *sys,
struct mscabd_decompress_state *d,
int *out, int ignore_cksum)
{
unsigned char hdr[cfdata_SIZEOF];
unsigned int cksum;
int len;
d->i_ptr = d->i_end = &d->input[0];
do {
if (sys->read(d->infh, &hdr[0], cfdata_SIZEOF) != cfdata_SIZEOF) {
return MSPACK_ERR_READ;
}
if (d->data->cab->block_resv &&
sys->seek(d->infh, (off_t) d->data->cab->block_resv,
MSPACK_SYS_SEEK_CUR))
{
return MSPACK_ERR_SEEK;
}
len = EndGetI16(&hdr[cfdata_CompressedSize]);
if (((d->i_end - d->i_ptr) + len) > CAB_INPUTMAX) {
return MSPACK_ERR_DATAFORMAT;
}
if (EndGetI16(&hdr[cfdata_UncompressedSize]) > CAB_BLOCKMAX) {
return MSPACK_ERR_DATAFORMAT;
}
if (sys->read(d->infh, d->i_end, len) != len) {
return MSPACK_ERR_READ;
}
if ((cksum = EndGetI32(&hdr[cfdata_CheckSum]))) {
unsigned int sum2 = cabd_checksum(d->i_end, (unsigned int) len, 0);
if (cabd_checksum(&hdr[4], 4, sum2) != cksum) {
if (!ignore_cksum) return MSPACK_ERR_CHECKSUM;
sys->message(d->infh, "WARNING; bad block checksum found");
}
}
d->i_end += len;
if ((*out = EndGetI16(&hdr[cfdata_UncompressedSize]))) {
return MSPACK_ERR_OK;
}
sys->close(d->infh);
d->infh = NULL;
if (!(d->data = d->data->next)) {
return MSPACK_ERR_DATAFORMAT;
}
d->incab = d->data->cab;
if (!(d->infh = sys->open(sys, d->incab->base.filename,
MSPACK_SYS_OPEN_READ)))
{
return MSPACK_ERR_OPEN;
}
if (sys->seek(d->infh, d->data->offset, MSPACK_SYS_SEEK_START)) {
return MSPACK_ERR_SEEK;
}
} while (1);
return MSPACK_ERR_OK;
}
static int cabd_read_headers(struct mspack_system *sys,
struct mspack_file *fh,
struct mscabd_cabinet_p *cab,
off_t offset, int quiet)
{
int num_folders, num_files, folder_resv, i, x;
struct mscabd_folder_p *fol, *linkfol = NULL;
struct mscabd_file *file, *linkfile = NULL;
unsigned char buf[64];
cab->base.next = NULL;
cab->base.files = NULL;
cab->base.folders = NULL;
cab->base.prevcab = cab->base.nextcab = NULL;
cab->base.prevname = cab->base.nextname = NULL;
cab->base.previnfo = cab->base.nextinfo = NULL;
cab->base.base_offset = offset;
if (sys->seek(fh, offset, MSPACK_SYS_SEEK_START)) {
return MSPACK_ERR_SEEK;
}
if (sys->read(fh, &buf[0], cfhead_SIZEOF) != cfhead_SIZEOF) {
return MSPACK_ERR_READ;
}
if (EndGetI32(&buf[cfhead_Signature]) != 0x4643534D) {
return MSPACK_ERR_SIGNATURE;
}
cab->base.length = EndGetI32(&buf[cfhead_CabinetSize]);
cab->base.set_id = EndGetI16(&buf[cfhead_SetID]);
cab->base.set_index = EndGetI16(&buf[cfhead_CabinetIndex]);
num_folders = EndGetI16(&buf[cfhead_NumFolders]);
if (num_folders == 0) {
if (!quiet) sys->message(fh, "no folders in cabinet.");
return MSPACK_ERR_DATAFORMAT;
}
num_files = EndGetI16(&buf[cfhead_NumFiles]);
if (num_files == 0) {
if (!quiet) sys->message(fh, "no files in cabinet.");
return MSPACK_ERR_DATAFORMAT;
}
if ((buf[cfhead_MajorVersion] != 1) && (buf[cfhead_MinorVersion] != 3)) {
if (!quiet) sys->message(fh, "WARNING; cabinet version is not 1.3");
}
cab->base.flags = EndGetI16(&buf[cfhead_Flags]);
if (cab->base.flags & cfheadRESERVE_PRESENT) {
if (sys->read(fh, &buf[0], cfheadext_SIZEOF) != cfheadext_SIZEOF) {
return MSPACK_ERR_READ;
}
cab->base.header_resv = EndGetI16(&buf[cfheadext_HeaderReserved]);
folder_resv = buf[cfheadext_FolderReserved];
cab->block_resv = buf[cfheadext_DataReserved];
if (cab->base.header_resv > 60000) {
if (!quiet) sys->message(fh, "WARNING; reserved header > 60000.");
}
if (cab->base.header_resv) {
if (sys->seek(fh, (off_t) cab->base.header_resv, MSPACK_SYS_SEEK_CUR)) {
return MSPACK_ERR_SEEK;
}
}
}
else {
cab->base.header_resv = 0;
folder_resv = 0;
cab->block_resv = 0;
}
if (cab->base.flags & cfheadPREV_CABINET) {
cab->base.prevname = cabd_read_string(sys, fh, cab, &x); if (x) return x;
cab->base.previnfo = cabd_read_string(sys, fh, cab, &x); if (x) return x;
}
if (cab->base.flags & cfheadNEXT_CABINET) {
cab->base.nextname = cabd_read_string(sys, fh, cab, &x); if (x) return x;
cab->base.nextinfo = cabd_read_string(sys, fh, cab, &x); if (x) return x;
}
for (i = 0; i < num_folders; i++) {
if (sys->read(fh, &buf[0], cffold_SIZEOF) != cffold_SIZEOF) {
return MSPACK_ERR_READ;
}
if (folder_resv) {
if (sys->seek(fh, (off_t) folder_resv, MSPACK_SYS_SEEK_CUR)) {
return MSPACK_ERR_SEEK;
}
}
if (!(fol = (struct mscabd_folder_p *)sys->alloc(sys, sizeof(struct mscabd_folder_p)))) {
return MSPACK_ERR_NOMEMORY;
}
fol->base.next = NULL;
fol->base.comp_type = EndGetI16(&buf[cffold_CompType]);
fol->base.num_blocks = EndGetI16(&buf[cffold_NumBlocks]);
fol->data.next = NULL;
fol->data.cab = (struct mscabd_cabinet_p *) cab;
fol->data.offset = offset + (off_t)
( (unsigned int) EndGetI32(&buf[cffold_DataOffset]) );
fol->merge_prev = NULL;
fol->merge_next = NULL;
if (!linkfol) cab->base.folders = (struct mscabd_folder *) fol;
else linkfol->base.next = (struct mscabd_folder *) fol;
linkfol = fol;
}
for (i = 0; i < num_files; i++) {
if (sys->read(fh, &buf[0], cffile_SIZEOF) != cffile_SIZEOF) {
return MSPACK_ERR_READ;
}
if (!(file = (struct mscabd_file *)sys->alloc(sys, sizeof(struct mscabd_file)))) {
return MSPACK_ERR_NOMEMORY;
}
file->next = NULL;
file->length = EndGetI32(&buf[cffile_UncompressedSize]);
file->attribs = EndGetI16(&buf[cffile_Attribs]);
file->offset = EndGetI32(&buf[cffile_FolderOffset]);
x = EndGetI16(&buf[cffile_FolderIndex]);
if (x < cffileCONTINUED_FROM_PREV) {
struct mscabd_folder *ifol = cab->base.folders;
while (x--) if (ifol) ifol = ifol->next;
file->folder = ifol;
if (!ifol) {
sys->free(file);
return MSPACK_ERR_DATAFORMAT;
}
}
else {
if ((x == cffileCONTINUED_TO_NEXT) ||
(x == cffileCONTINUED_PREV_AND_NEXT))
{
struct mscabd_folder *ifol = cab->base.folders;
while (ifol->next) ifol = ifol->next;
file->folder = ifol;
fol = (struct mscabd_folder_p *) ifol;
if (!fol->merge_next) fol->merge_next = file;
}
if ((x == cffileCONTINUED_FROM_PREV) ||
(x == cffileCONTINUED_PREV_AND_NEXT))
{
file->folder = cab->base.folders;
fol = (struct mscabd_folder_p *) file->folder;
if (!fol->merge_prev) fol->merge_prev = file;
}
}
x = EndGetI16(&buf[cffile_Time]);
file->time_h = x >> 11;
file->time_m = (x >> 5) & 0x3F;
file->time_s = (x << 1) & 0x3E;
x = EndGetI16(&buf[cffile_Date]);
file->date_d = x & 0x1F;
file->date_m = (x >> 5) & 0xF;
file->date_y = (x >> 9) + 1980;
file->filename = cabd_read_string(sys, fh, cab, &x);
if (x) {
sys->free(file);
return x;
}
if (!linkfile) cab->base.files = file;
else linkfile->next = file;
linkfile = file;
}
return MSPACK_ERR_OK;
}
static BOOL WINTRUST_GetSignedMsgFromCabFile(SIP_SUBJECTINFO *pSubjectInfo,
DWORD *pdwEncodingType, DWORD dwIndex, DWORD *pcbSignedDataMsg,
BYTE *pbSignedDataMsg)
{
int header_resv;
LONG base_offset, cabsize;
USHORT flags;
BYTE buf[64];
DWORD cert_offset, cert_size, dwRead;
TRACE("(%p %p %d %p %p)\n", pSubjectInfo, pdwEncodingType, dwIndex,
pcbSignedDataMsg, pbSignedDataMsg);
/*
* FIXME: I just noticed that I am memorizing the initial file pointer
* offset and restoring it before reading in the rest of the header
* information in the cabinet. Perhaps that's correct -- that is, perhaps
* this API is supposed to support "streaming" cabinets which are embedded
* in other files, or cabinets which begin at file offsets other than zero.
* Otherwise, I should instead go to the absolute beginning of the file.
* (Either way, the semantics of wine's FDICopy require me to leave the
* file pointer where it is afterwards -- If Windows does not do so, we
* ought to duplicate the native behavior in the FDIIsCabinet API, not here.
*
* So, the answer lies in Windows; will native cabinet.dll recognize a
* cabinet "file" embedded in another file? Note that cabextract.c does
* support this, which implies that Microsoft's might. I haven't tried it
* yet so I don't know. ATM, most of wine's FDI cabinet routines (except
* this one) would not work in this way. To fix it, we could just make the
* various references to absolute file positions in the code relative to an
* initial "beginning" offset. Because the FDICopy API doesn't take a
* file-handle like this one, we would therein need to search through the
* file for the beginning of the cabinet (as we also do in cabextract.c).
* Note that this limits us to a maximum of one cabinet per. file: the first.
*
* So, in summary: either the code below is wrong, or the rest of fdi.c is
* wrong... I cannot imagine that both are correct ;) One of these flaws
* should be fixed after determining the behavior on Windows. We ought
* to check both FDIIsCabinet and FDICopy for the right behavior.
*
* -gmt
*/
/* get basic offset & size info */
base_offset = SetFilePointer(pSubjectInfo->hFile, 0L, NULL, SEEK_CUR);
if (SetFilePointer(pSubjectInfo->hFile, 0, NULL, SEEK_END) == INVALID_SET_FILE_POINTER)
{
TRACE("seek error\n");
return FALSE;
}
cabsize = SetFilePointer(pSubjectInfo->hFile, 0L, NULL, SEEK_CUR);
if ((cabsize == -1) || (base_offset == -1) ||
(SetFilePointer(pSubjectInfo->hFile, base_offset, NULL, SEEK_SET) == INVALID_SET_FILE_POINTER))
{
TRACE("seek error\n");
return FALSE;
}
/* read in the CFHEADER */
if (!ReadFile(pSubjectInfo->hFile, buf, cfhead_SIZEOF, &dwRead, NULL) ||
dwRead != cfhead_SIZEOF)
{
TRACE("reading header failed\n");
return FALSE;
}
/* check basic MSCF signature */
if (EndGetI32(buf+cfhead_Signature) != 0x4643534d)
{
WARN("cabinet signature not present\n");
return FALSE;
}
/* Ignore the number of folders and files and the set and cabinet IDs */
/* check the header revision */
if ((buf[cfhead_MajorVersion] > 1) ||
(buf[cfhead_MajorVersion] == 1 && buf[cfhead_MinorVersion] > 3))
{
WARN("cabinet format version > 1.3\n");
return FALSE;
}
/* pull the flags out */
flags = EndGetI16(buf+cfhead_Flags);
if (!(flags & cfheadRESERVE_PRESENT))
{
TRACE("no header present, not signed\n");
return FALSE;
}
if (!ReadFile(pSubjectInfo->hFile, buf, cfheadext_SIZEOF, &dwRead, NULL) ||
dwRead != cfheadext_SIZEOF)
{
ERR("bunk reserve-sizes?\n");
return FALSE;
}
header_resv = EndGetI16(buf+cfheadext_HeaderReserved);
if (!header_resv)
{
TRACE("no header_resv, not signed\n");
return FALSE;
}
else if (header_resv < cfsigninfo_SIZEOF)
{
TRACE("header_resv too small, not signed\n");
return FALSE;
}
if (header_resv > 60000)
{
WARN("WARNING; header reserved space > 60000\n");
}
if (!ReadFile(pSubjectInfo->hFile, buf, cfsigninfo_SIZEOF, &dwRead, NULL) ||
dwRead != cfsigninfo_SIZEOF)
{
ERR("couldn't read reserve\n");
return FALSE;
}
cert_offset = EndGetI32(buf+cfsigninfo_CertOffset);
TRACE("cert_offset: %d\n", cert_offset);
cert_size = EndGetI32(buf+cfsigninfo_CertSize);
TRACE("cert_size: %d\n", cert_size);
/* The redundant checks are to avoid wraparound */
if (cert_offset > cabsize || cert_size > cabsize ||
cert_offset + cert_size > cabsize)
{
WARN("offset beyond file, not attempting to read\n");
return FALSE;
}
SetFilePointer(pSubjectInfo->hFile, base_offset, NULL, SEEK_SET);
if (!pbSignedDataMsg)
{
*pcbSignedDataMsg = cert_size;
return TRUE;
}
if (*pcbSignedDataMsg < cert_size)
{
*pcbSignedDataMsg = cert_size;
SetLastError(ERROR_INSUFFICIENT_BUFFER);
return FALSE;
}
if (SetFilePointer(pSubjectInfo->hFile, cert_offset, NULL, SEEK_SET) == INVALID_SET_FILE_POINTER)
{
ERR("couldn't seek to cert location\n");
return FALSE;
}
if (!ReadFile(pSubjectInfo->hFile, pbSignedDataMsg, cert_size, &dwRead,
NULL) || dwRead != cert_size)
{
ERR("couldn't read cert\n");
return FALSE;
}
/* The encoding of the files I've seen appears to be in ASN.1
* format, and there isn't a field indicating the type, so assume it
* always is.
*/
*pdwEncodingType = X509_ASN_ENCODING | PKCS_7_ASN_ENCODING;
return TRUE;
}
