openldap/libraries/liblutil/passwd.c

/*
 * lutil_password(credentials, password)
 *
 * Returns true if user supplied credentials matches
 * the stored password. 
 *
 * Due to the use of the crypt(3) function 
 * this routine is NOT thread-safe.
 */

#include "portable.h"

#include <ac/string.h>
#include <ac/unistd.h>

#include "lutil_md5.h"
#include "lutil_sha1.h"
#include "lutil.h"
extern char *crypt (const char *, const char *);

/*
 */

int
lutil_passwd(
	const char *cred,
	const char *passwd)
{

	if (cred == NULL || passwd == NULL) {
		return 0;
	}

	if (strncasecmp(passwd, "{CRYPT}", sizeof("{CRYPT}") - 1) == 0 ) {
		const char *p = passwd + (sizeof("{CRYPT}") - 1);

		return( strcmp(p, crypt(cred, p)) != 0 );

	} else if (strncasecmp(passwd, "{MD5}", sizeof("{MD5}") - 1) == 0 ) {
		ldap_MD5_CTX MD5context;
		unsigned char MD5digest[20];
		char base64digest[29];  /* ceiling(sizeof(input)/3) * 4 + 1 */

		const char *p = passwd + (sizeof("{MD5}") - 1);

		ldap_MD5Init(&MD5context);
		ldap_MD5Update(&MD5context,
			cred, strlen(cred));
		ldap_MD5Final(MD5digest, &MD5context);

		if ( b64_ntop(MD5digest, sizeof(MD5digest),
			base64digest, sizeof(base64digest)) < 0)
		{
			return ( 1 );
		}

		return (strcmp(p, base64digest) != 0);

	} else if (strncasecmp(passwd, "{SHA}",sizeof("{SHA}") - 1) == 0 ) {
		ldap_SHA1_CTX SHA1context;
		unsigned char SHA1digest[20];
		char base64digest[29];  /* ceiling(sizeof(input)/3) * 4 + 1 */
		const char *p = passwd + (sizeof("{SHA}") - 1);

		ldap_SHA1Init(&SHA1context);
		ldap_SHA1Update(&SHA1context,
			(unsigned char *) cred, strlen(cred));
		ldap_SHA1Final(SHA1digest, &SHA1context);

		if (b64_ntop(SHA1digest, sizeof(SHA1digest),
			base64digest, sizeof(base64digest)) < 0)
		{
			return ( 0 );
		}

		return( strcmp(p, base64digest) != 0 );
	}

	return( strcmp(passwd, cred) != 0 );
}