gecko/security/nss/cmd/checkcert/checkcert.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) 1994-2000
* 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 ***** */
#include "secutil.h"
#include "plgetopt.h"
#include "cert.h"
#include "secoid.h"
#include "cryptohi.h"
/* maximum supported modulus length in bits (indicate problem if over this) */
#define MAX_MODULUS (1024)
static void Usage(char *progName)
{
fprintf(stderr, "Usage: %s [aAvf] [certtocheck] [issuingcert]\n",
progName);
fprintf(stderr, "%-20s Cert to check is base64 encoded\n",
"-a");
fprintf(stderr, "%-20s Issuer's cert is base64 encoded\n",
"-A");
fprintf(stderr, "%-20s Verbose (indicate decoding progress etc.)\n",
"-v");
fprintf(stderr, "%-20s Force sanity checks even if pretty print fails.\n",
"-f");
fprintf(stderr, "%-20s Define an output file to use (default is stdout)\n",
"-o output");
fprintf(stderr, "%-20s Specify the input type (no default)\n",
"-t type");
exit(-1);
}
/*
* Check integer field named fieldName, printing out results and
* returning the length of the integer in bits
*/
static
int checkInteger(SECItem *intItem, char *fieldName, int verbose)
{
int len, bitlen;
if (verbose) {
printf("Checking %s\n", fieldName);
}
len = intItem->len;
if (len && (intItem->data[0] & 0x80)) {
printf("PROBLEM: %s is NEGATIVE 2's-complement integer.\n",
fieldName);
}
/* calculate bit length and check for unnecessary leading zeros */
bitlen = len << 3;
if (len > 1 && intItem->data[0] == 0) {
/* leading zero byte(s) */
if (!(intItem->data[1] & 0x80)) {
printf("PROBLEM: %s has unneeded leading zeros. Violates DER.\n",
fieldName);
}
/* strip leading zeros in length calculation */
{
int i=0;
while (bitlen > 8 && intItem->data[i] == 0) {
bitlen -= 8;
i++;
}
}
}
return bitlen;
}
static
void checkName(CERTName *n, char *fieldName, int verbose)
{
char *v=0;
if (verbose) {
printf("Checking %s\n", fieldName);
}
v = CERT_GetCountryName(n);
if (!v) {
printf("PROBLEM: %s lacks Country Name (C)\n",
fieldName);
}
PORT_Free(v);
v = CERT_GetOrgName(n);
if (!v) {
printf("PROBLEM: %s lacks Organization Name (O)\n",
fieldName);
}
PORT_Free(v);
v = CERT_GetOrgUnitName(n);
if (!v) {
printf("WARNING: %s lacks Organization Unit Name (OU)\n",
fieldName);
}
PORT_Free(v);
v = CERT_GetCommonName(n);
if (!v) {
printf("PROBLEM: %s lacks Common Name (CN)\n",
fieldName);
}
PORT_Free(v);
}
static
SECStatus
OurVerifyData(unsigned char *buf, int len, SECKEYPublicKey *key,
SECItem *sig, SECAlgorithmID *sigAlgorithm)
{
SECStatus rv;
VFYContext *cx;
SECOidData *sigAlgOid, *oiddata;
SECOidTag sigAlgTag;
SECOidTag hashAlgTag;
int showDigestOid=0;
cx = VFY_CreateContextWithAlgorithmID(key, sig, sigAlgorithm, &hashAlgTag,
NULL);
if (cx == NULL)
return SECFailure;
sigAlgOid = SECOID_FindOID(&sigAlgorithm->algorithm);
if (sigAlgOid == 0)
return SECFailure;
sigAlgTag = sigAlgOid->offset;
if (showDigestOid) {
oiddata = SECOID_FindOIDByTag(hashAlgTag);
if ( oiddata ) {
printf("PROBLEM: (cont) Digest OID is %s\n", oiddata->desc);
} else {
SECU_PrintAsHex(stdout,
&oiddata->oid, "PROBLEM: UNKNOWN OID", 0);
}
}
rv = VFY_Begin(cx);
if (rv == SECSuccess) {
rv = VFY_Update(cx, buf, len);
if (rv == SECSuccess)
rv = VFY_End(cx);
}
VFY_DestroyContext(cx, PR_TRUE);
return rv;
}
static
SECStatus
OurVerifySignedData(CERTSignedData *sd, CERTCertificate *cert)
{
SECItem sig;
SECKEYPublicKey *pubKey = 0;
SECStatus rv;
/* check the certificate's validity */
rv = CERT_CertTimesValid(cert);
if ( rv ) {
return(SECFailure);
}
/* get cert's public key */
pubKey = CERT_ExtractPublicKey(cert);
if ( !pubKey ) {
return(SECFailure);
}
/* check the signature */
sig = sd->signature;
DER_ConvertBitString(&sig);
rv = OurVerifyData(sd->data.data, sd->data.len, pubKey, &sig,
&sd->signatureAlgorithm);
SECKEY_DestroyPublicKey(pubKey);
if ( rv ) {
return(SECFailure);
}
return(SECSuccess);
}
static
CERTCertificate *createEmptyCertificate(void)
{
PRArenaPool *arena = 0;
CERTCertificate *c = 0;
arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
if ( !arena ) {
return 0;
}
c = (CERTCertificate *) PORT_ArenaZAlloc(arena, sizeof(CERTCertificate));
if (c) {
c->referenceCount = 1;
c->arena = arena;
} else {
PORT_FreeArena(arena,PR_TRUE);
}
return c;
}
int main(int argc, char **argv)
{
int rv, verbose=0, force=0;
int ascii=0, issuerAscii=0;
char *progName=0;
PRFileDesc *inFile=0, *issuerCertFile=0;
SECItem derCert, derIssuerCert;
PRArenaPool *arena=0;
CERTSignedData *signedData=0;
CERTCertificate *cert=0, *issuerCert=0;
SECKEYPublicKey *rsapubkey=0;
SECAlgorithmID md5WithRSAEncryption, md2WithRSAEncryption;
SECAlgorithmID sha1WithRSAEncryption, rsaEncryption;
SECItem spk;
int selfSigned=0;
int invalid=0;
char *inFileName = NULL, *issuerCertFileName = NULL;
PLOptState *optstate;
PLOptStatus status;
PORT_Memset(&md5WithRSAEncryption, 0, sizeof(md5WithRSAEncryption));
PORT_Memset(&md2WithRSAEncryption, 0, sizeof(md2WithRSAEncryption));
PORT_Memset(&sha1WithRSAEncryption, 0, sizeof(sha1WithRSAEncryption));
PORT_Memset(&rsaEncryption, 0, sizeof(rsaEncryption));
progName = strrchr(argv[0], '/');
progName = progName ? progName+1 : argv[0];
optstate = PL_CreateOptState(argc, argv, "aAvf");
while ((status = PL_GetNextOpt(optstate)) == PL_OPT_OK) {
switch (optstate->option) {
case 'v':
verbose = 1;
break;
case 'f':
force = 1;
break;
case 'a':
ascii = 1;
break;
case 'A':
issuerAscii = 1;
break;
case '\0':
if (!inFileName)
inFileName = PL_strdup(optstate->value);
else if (!issuerCertFileName)
issuerCertFileName = PL_strdup(optstate->value);
else
Usage(progName);
break;
}
}
if (!inFileName || !issuerCertFileName || status == PL_OPT_BAD) {
/* insufficient or excess args */
Usage(progName);
}
inFile = PR_Open(inFileName, PR_RDONLY, 0);
if (!inFile) {
fprintf(stderr, "%s: unable to open \"%s\" for reading\n",
progName, inFileName);
exit(1);
}
issuerCertFile = PR_Open(issuerCertFileName, PR_RDONLY, 0);
if (!issuerCertFile) {
fprintf(stderr, "%s: unable to open \"%s\" for reading\n",
progName, issuerCertFileName);
exit(1);
}
if (SECU_ReadDERFromFile(&derCert, inFile, ascii) != SECSuccess) {
printf("Couldn't read input certificate as DER binary or base64\n");
exit(1);
}
arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
if (arena == 0) {
fprintf(stderr,"%s: can't allocate scratch arena!", progName);
exit(1);
}
if (issuerCertFile) {
CERTSignedData *issuerCertSD=0;
if (SECU_ReadDERFromFile(&derIssuerCert, issuerCertFile, issuerAscii)
!= SECSuccess) {
printf("Couldn't read issuer certificate as DER binary or base64.\n");
exit(1);
}
issuerCertSD = PORT_ArenaZNew(arena, CERTSignedData);
if (!issuerCertSD) {
fprintf(stderr,"%s: can't allocate issuer signed data!", progName);
exit(1);
}
rv = SEC_ASN1DecodeItem(arena, issuerCertSD,
SEC_ASN1_GET(CERT_SignedDataTemplate),
&derIssuerCert);
if (rv) {
fprintf(stderr, "%s: Issuer cert isn't X509 SIGNED Data?\n",
progName);
exit(1);
}
issuerCert = createEmptyCertificate();
if (!issuerCert) {
printf("%s: can't allocate space for issuer cert.", progName);
exit(1);
}
rv = SEC_ASN1DecodeItem(arena, issuerCert,
SEC_ASN1_GET(CERT_CertificateTemplate),
&issuerCertSD->data);
if (rv) {
printf("%s: Does not appear to be an X509 Certificate.\n",
progName);
exit(1);
}
}
signedData = PORT_ArenaZNew(arena,CERTSignedData);
if (!signedData) {
fprintf(stderr,"%s: can't allocate signedData!", progName);
exit(1);
}
rv = SEC_ASN1DecodeItem(arena, signedData,
SEC_ASN1_GET(CERT_SignedDataTemplate),
&derCert);
if (rv) {
fprintf(stderr, "%s: Does not appear to be X509 SIGNED Data.\n",
progName);
exit(1);
}
if (verbose) {
printf("Decoded ok as X509 SIGNED data.\n");
}
cert = createEmptyCertificate();
if (!cert) {
fprintf(stderr, "%s: can't allocate cert", progName);
exit(1);
}
rv = SEC_ASN1DecodeItem(arena, cert,
SEC_ASN1_GET(CERT_CertificateTemplate),
&signedData->data);
if (rv) {
fprintf(stderr, "%s: Does not appear to be an X509 Certificate.\n",
progName);
exit(1);
}
if (verbose) {
printf("Decoded ok as an X509 certificate.\n");
}
SECU_RegisterDynamicOids();
rv = SECU_PrintSignedData(stdout, &derCert, "Certificate", 0,
SECU_PrintCertificate);
if (rv) {
fprintf(stderr, "%s: Unable to pretty print cert. Error: %d\n",
progName, PORT_GetError());
if (!force) {
exit(1);
}
}
/* Do various checks on the cert */
printf("\n");
/* Check algorithms */
SECOID_SetAlgorithmID(arena, &md5WithRSAEncryption,
SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION, NULL);
SECOID_SetAlgorithmID(arena, &md2WithRSAEncryption,
SEC_OID_PKCS1_MD2_WITH_RSA_ENCRYPTION, NULL);
SECOID_SetAlgorithmID(arena, &sha1WithRSAEncryption,
SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION, NULL);
SECOID_SetAlgorithmID(arena, &rsaEncryption,
SEC_OID_PKCS1_RSA_ENCRYPTION, NULL);
{
int isMD5RSA = (SECOID_CompareAlgorithmID(&cert->signature,
&md5WithRSAEncryption) == 0);
int isMD2RSA = (SECOID_CompareAlgorithmID(&cert->signature,
&md2WithRSAEncryption) == 0);
int isSHA1RSA = (SECOID_CompareAlgorithmID(&cert->signature,
&sha1WithRSAEncryption) == 0);
if (verbose) {
printf("\nDoing algorithm checks.\n");
}
if (!(isMD5RSA || isMD2RSA || isSHA1RSA)) {
printf("PROBLEM: Signature not PKCS1 MD5, MD2, or SHA1 + RSA.\n");
} else if (!isMD5RSA) {
printf("WARNING: Signature not PKCS1 MD5 with RSA Encryption\n");
}
if (SECOID_CompareAlgorithmID(&cert->signature,
&signedData->signatureAlgorithm)) {
printf("PROBLEM: Algorithm in sig and certInfo don't match.\n");
}
}
if (SECOID_CompareAlgorithmID(&cert->subjectPublicKeyInfo.algorithm,
&rsaEncryption)) {
printf("PROBLEM: Public key algorithm is not PKCS1 RSA Encryption.\n");
}
/* Check further public key properties */
spk = cert->subjectPublicKeyInfo.subjectPublicKey;
DER_ConvertBitString(&spk);
if (verbose) {
printf("\nsubjectPublicKey DER\n");
rv = DER_PrettyPrint(stdout, &spk, PR_FALSE);
printf("\n");
}
rsapubkey = (SECKEYPublicKey *)
PORT_ArenaZAlloc(arena,sizeof(SECKEYPublicKey));
if (!rsapubkey) {
fprintf(stderr, "%s: rsapubkey allocation failed.\n", progName);
exit(1);
}
rv = SEC_ASN1DecodeItem(arena, rsapubkey,
SEC_ASN1_GET(SECKEY_RSAPublicKeyTemplate), &spk);
if (rv) {
printf("PROBLEM: subjectPublicKey is not a DER PKCS1 RSAPublicKey.\n");
} else {
int mlen;
int pubexp;
if (verbose) {
printf("Decoded RSA Public Key ok. Doing key checks.\n");
}
PORT_Assert(rsapubkey->keyType == rsaKey); /* XXX RSA */
mlen = checkInteger(&rsapubkey->u.rsa.modulus, "Modulus", verbose);
printf("INFO: Public Key modulus length in bits: %d\n", mlen);
if (mlen > MAX_MODULUS) {
printf("PROBLEM: Modulus length exceeds %d bits.\n",
MAX_MODULUS);
}
if (mlen < 512) {
printf("WARNING: Short modulus.\n");
}
if (mlen != (1 << (ffs(mlen)-1))) {
printf("WARNING: Unusual modulus length (not a power of two).\n");
}
checkInteger(&rsapubkey->u.rsa.publicExponent, "Public Exponent",
verbose);
pubexp = DER_GetInteger(&rsapubkey->u.rsa.publicExponent);
if (pubexp != 17 && pubexp != 3 && pubexp != 65537) {
printf("WARNING: Public exponent not any of: 3, 17, 65537\n");
}
}
/* Name checks */
checkName(&cert->issuer, "Issuer Name", verbose);
checkName(&cert->subject, "Subject Name", verbose);
if (issuerCert) {
SECComparison c =
CERT_CompareName(&cert->issuer, &issuerCert->subject);
if (c) {
printf("PROBLEM: Issuer Name and Subject in Issuing Cert differ\n");
}
}
/* Check if self-signed */
selfSigned = (CERT_CompareName(&cert->issuer, &cert->subject) == 0);
if (selfSigned) {
printf("INFO: Certificate is self signed.\n");
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} else {
printf("INFO: Certificate is NOT self-signed.\n");
}
/* Validity time check */
if (CERT_CertTimesValid(cert) == SECSuccess) {
printf("INFO: Inside validity period of certificate.\n");
} else {
printf("PROBLEM: Not in validity period of certificate.\n");
invalid = 1;
}
/* Signature check if self-signed */
if (selfSigned && !invalid) {
if (rsapubkey->u.rsa.modulus.len) {
SECStatus ver;
if (verbose) {
printf("Checking self signature.\n");
}
ver = OurVerifySignedData(signedData, cert);
if (ver != SECSuccess) {
printf("PROBLEM: Verification of self-signature failed!\n");
} else {
printf("INFO: Self-signature verifies ok.\n");
}
} else {
printf("INFO: Not checking signature due to key problems.\n");
}
} else if (!selfSigned && !invalid && issuerCert) {
SECStatus ver;
ver = OurVerifySignedData(signedData, issuerCert);
if (ver != SECSuccess) {
printf("PROBLEM: Verification of issuer's signature failed!\n");
} else {
printf("INFO: Issuer's signature verifies ok.\n");
}
} else {
printf("INFO: Not checking signature.\n");
}
return 0;
}