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/********************************************************************
* *
* File: certutils.c *
* *
********************************************************************
* *
* Authors: *
* David Corcoran <corcoran@linuxnet.com> *
* Eirik A. Herskedal <ehersked@cs.purdue.edu> *
* Peter Huang <peter_huang@hp.com> *
********************************************************************
* *
* Utility functions for reading certificates and extracting data *
* from the certificates. *
* It also includes a random number function for *
* challenge/response. *
* *
********************************************************************/
#include <syslog.h>
#include <pem.h>
#include "certutils.h"
#include "preferences.h"
int getRandom(char *buf, int len)
{
int fh, i, rv;
/* open random device */
fh = open(RANDOM_DEVICE, O_RDONLY);
if (fh == -1) return -1;
/* read len bytes */
for (i = 0; i < len; ) {
rv = read(fh, &buf[i], len-i);
if (rv == -1) return -1;
i += rv;
}
/* the most significant bit must be zero */
buf[0] &= 0x7F;
/* close device */
close(fh);
return 0;
}
/* Method to read a certificate from a file */
int getFileCert(const char *file, X509 **cert) {
FILE *fp;
X509 *mycert = NULL;
// Open file
fp = fopen(file, "rb");
if (fp == NULL)
return -1;
// Get the cert
d2i_X509_fp(fp, &mycert);
fclose(fp);
if (mycert == NULL)
return -1;
*cert = mycert;
return 0;
}
/* add the code to read PEM certificate */
int getFileCertPEM(const char *file, X509 **cert) {
FILE *fp;
X509 *mycert = NULL;
// Open file
fp = fopen(file, "rb");
if (fp == NULL) {
syslog(LOG_ERR, "cannot open certificate file %s: %s", file, strerror(errno));
return -1;
}
// Get the cert
PEM_read_X509(fp,&mycert,NULL,NULL);
fclose(fp);
if (mycert == NULL) {
syslog(LOG_ERR, "File %s does not contain X509 certificate - PEM_read_X509() fails", file);
return -1;
}
*cert = mycert;
return 0;
}
/* add the code to read a public key certificate from a file */
int getPubKeyFromFile(const char *file, EVP_PKEY **cert) {
FILE *fp;
EVP_PKEY *mycert = NULL;
// Open file
fp = fopen(file, "rb");
if (fp == NULL) {
syslog(LOG_ERR, "cannot open certificate file %s: %s", file, strerror(errno));
return -1;
}
// Get the cert
PEM_read_PUBKEY(fp,&mycert,NULL,NULL);
fclose(fp);
if (mycert == NULL) {
syslog(LOG_ERR, "File %s does not contain Public Key certificate - PEM_read_PUBKEY() fails", file);
return -1;
}
*cert = mycert;
return 0;
}
/* Method to read a certificate from a a smartcard */
int getCardCert(MSCTokenConnection pConnection, X509 **cert) {
int rv;
MSCULong32 objSize;
MSCPUChar8 buf;
BIO *mem = BIO_new(BIO_s_mem());
X509 *mycert = NULL;
char certID[3];
snprintf(certID, 3, "C%d", pr.certnumber);
certID[2] = '\0';
// Read certificate object from card
rv = MSCReadAllocateObject(&pConnection, certID, &buf, &objSize, NULL, NULL);
if (rv != MSC_SUCCESS)
return -1;
BIO_write(mem, buf, objSize);
// Get the cert
d2i_X509_bio(mem, &mycert);
if (mycert == NULL)
return -1;
*cert = mycert;
BIO_vfree(mem);
return 0;
}
/* Check validity of a cert */
int checkCert(X509* cert) {
int before, after;
// Check the expiration dates
before = X509_cmp_current_time(cert->cert_info->validity->notBefore);
after = X509_cmp_current_time(cert->cert_info->validity->notAfter);
if (before > 0 || after < 0)
return -1;
return 0;
}
/* Extract certificate from smartcard */
int getPublicKey(X509 *cert, EVP_PKEY **pub_key) {
// Get the public key from the certificate
*pub_key = (EVP_PKEY*) X509_get_pubkey(cert);
if (*pub_key == NULL)
return -1;
return 0;
}
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