gecko/security/nss/lib/freebl/shvfy.c

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2008-06-06 05:40:11 -07:00
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Netscape security libraries.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2003
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* $Id: shvfy.c,v 1.11 2008/11/18 19:48:24 rrelyea%redhat.com Exp $ */
#ifdef FREEBL_NO_DEPEND
#include "stubs.h"
#endif
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#include "shsign.h"
#include "prlink.h"
#include "prio.h"
#include "blapi.h"
#include "seccomon.h"
#include "stdio.h"
#include "prmem.h"
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/* #define DEBUG_SHVERIFY 1 */
static char *
mkCheckFileName(const char *libName)
{
int ln_len = PORT_Strlen(libName);
char *output = PORT_Alloc(ln_len+sizeof(SGN_SUFFIX));
int index = ln_len + 1 - sizeof("."SHLIB_SUFFIX);
if ((index > 0) &&
(PORT_Strncmp(&libName[index],
"."SHLIB_SUFFIX,sizeof("."SHLIB_SUFFIX)) == 0)) {
ln_len = index;
}
PORT_Memcpy(output,libName,ln_len);
PORT_Memcpy(&output[ln_len],SGN_SUFFIX,sizeof(SGN_SUFFIX));
return output;
}
static int
decodeInt(unsigned char *buf)
{
return (buf[3]) | (buf[2] << 8) | (buf[1] << 16) | (buf[0] << 24);
}
static SECStatus
readItem(PRFileDesc *fd, SECItem *item)
{
unsigned char buf[4];
int bytesRead;
bytesRead = PR_Read(fd, buf, 4);
if (bytesRead != 4) {
return SECFailure;
}
item->len = decodeInt(buf);
item->data = PORT_Alloc(item->len);
if (item->data == NULL) {
item->len = 0;
return SECFailure;
}
bytesRead = PR_Read(fd, item->data, item->len);
if (bytesRead != item->len) {
PORT_Free(item->data);
item->data = NULL;
item->len = 0;
return SECFailure;
}
return SECSuccess;
}
PRBool
BLAPI_SHVerify(const char *name, PRFuncPtr addr)
{
/* find our shared library name */
char *shName = PR_GetLibraryFilePathname(name, addr);
char *checkName = NULL;
PRFileDesc *checkFD = NULL;
PRFileDesc *shFD = NULL;
SHA1Context *hashcx = NULL;
SECItem signature = { 0, NULL, 0 };
SECItem hash;
int bytesRead, offset;
SECStatus rv;
DSAPublicKey key;
int count;
PRBool result = PR_FALSE; /* if anything goes wrong,
* the signature does not verify */
unsigned char buf[512];
unsigned char hashBuf[SHA1_LENGTH];
PORT_Memset(&key,0,sizeof(key));
hash.data = hashBuf;
hash.len = sizeof(hashBuf);
if (!shName) {
goto loser;
}
/* figure out the name of our check file */
checkName = mkCheckFileName(shName);
if (!checkName) {
goto loser;
}
/* open the check File */
checkFD = PR_Open(checkName, PR_RDONLY, 0);
if (checkFD == NULL) {
#ifdef DEBUG_SHVERIFY
fprintf(stderr, "Failed to open the check file %s: (%d, %d)\n",
checkName, (int)PR_GetError(), (int)PR_GetOSError());
#endif /* DEBUG_SHVERIFY */
goto loser;
}
/* read and Verify the headerthe header */
bytesRead = PR_Read(checkFD, buf, 12);
if (bytesRead != 12) {
goto loser;
}
if ((buf[0] != NSS_SIGN_CHK_MAGIC1) || (buf[1] != NSS_SIGN_CHK_MAGIC2)) {
goto loser;
}
if ((buf[2] != NSS_SIGN_CHK_MAJOR_VERSION) ||
(buf[3] < NSS_SIGN_CHK_MINOR_VERSION)) {
goto loser;
}
#ifdef notdef
if (decodeInt(&buf[8]) != CKK_DSA) {
goto loser;
}
#endif
/* seek past any future header extensions */
offset = decodeInt(&buf[4]);
PR_Seek(checkFD, offset, PR_SEEK_SET);
/* read the key */
rv = readItem(checkFD,&key.params.prime);
if (rv != SECSuccess) {
goto loser;
}
rv = readItem(checkFD,&key.params.subPrime);
if (rv != SECSuccess) {
goto loser;
}
rv = readItem(checkFD,&key.params.base);
if (rv != SECSuccess) {
goto loser;
}
rv = readItem(checkFD,&key.publicValue);
if (rv != SECSuccess) {
goto loser;
}
/* read the siganture */
rv = readItem(checkFD,&signature);
if (rv != SECSuccess) {
goto loser;
}
/* done with the check file */
PR_Close(checkFD);
checkFD = NULL;
/* open our library file */
shFD = PR_Open(shName, PR_RDONLY, 0);
if (shFD == NULL) {
#ifdef DEBUG_SHVERIFY
fprintf(stderr, "Failed to open the library file %s: (%d, %d)\n",
shName, (int)PR_GetError(), (int)PR_GetOSError());
#endif /* DEBUG_SHVERIFY */
goto loser;
}
/* hash our library file with SHA1 */
hashcx = SHA1_NewContext();
if (hashcx == NULL) {
goto loser;
}
SHA1_Begin(hashcx);
count = 0;
while ((bytesRead = PR_Read(shFD, buf, sizeof(buf))) > 0) {
SHA1_Update(hashcx, buf, bytesRead);
count += bytesRead;
}
PR_Close(shFD);
shFD = NULL;
SHA1_End(hashcx, hash.data, &hash.len, hash.len);
/* verify the hash against the check file */
if (DSA_VerifyDigest(&key, &signature, &hash) == SECSuccess) {
result = PR_TRUE;
}
#ifdef DEBUG_SHVERIFY
{
int i,j;
fprintf(stderr,"File %s: %d bytes\n",shName, count);
fprintf(stderr," hash: %d bytes\n", hash.len);
#define STEP 10
for (i=0; i < hash.len; i += STEP) {
fprintf(stderr," ");
for (j=0; j < STEP && (i+j) < hash.len; j++) {
fprintf(stderr," %02x", hash.data[i+j]);
}
fprintf(stderr,"\n");
}
fprintf(stderr," signature: %d bytes\n", signature.len);
for (i=0; i < signature.len; i += STEP) {
fprintf(stderr," ");
for (j=0; j < STEP && (i+j) < signature.len; j++) {
fprintf(stderr," %02x", signature.data[i+j]);
}
fprintf(stderr,"\n");
}
fprintf(stderr,"Verified : %s\n",result?"TRUE": "FALSE");
}
#endif /* DEBUG_SHVERIFY */
loser:
if (shName != NULL) {
PR_Free(shName);
}
if (checkName != NULL) {
PORT_Free(checkName);
}
if (checkFD != NULL) {
PR_Close(checkFD);
}
if (shFD != NULL) {
PR_Close(shFD);
}
if (hashcx != NULL) {
SHA1_DestroyContext(hashcx,PR_TRUE);
}
if (signature.data != NULL) {
PORT_Free(signature.data);
}
if (key.params.prime.data != NULL) {
PORT_Free(key.params.prime.data);
}
if (key.params.subPrime.data != NULL) {
PORT_Free(key.params.subPrime.data);
}
if (key.params.base.data != NULL) {
PORT_Free(key.params.base.data);
}
if (key.publicValue.data != NULL) {
PORT_Free(key.publicValue.data);
}
return result;
}
PRBool
BLAPI_VerifySelf(const char *name)
{
/* to separate shlib to verify if name is NULL */
if (name == NULL) {
return PR_TRUE;
}
return BLAPI_SHVerify(name, (PRFuncPtr) decodeInt);
}