[thirdparty/cups.git] / scheduler / cert.c

/*
 * "$Id$"
 *
 * Authentication certificate routines for the CUPS scheduler.
 *
 * Copyright 2007-2015 by Apple Inc.
 * Copyright 1997-2006 by Easy Software Products.
 *
 * These coded instructions, statements, and computer programs are the
 * property of Apple Inc. and are protected by Federal copyright
 * law.  Distribution and use rights are outlined in the file "LICENSE.txt"
 * which should have been included with this file.  If this file is
 * file is missing or damaged, see the license at "http://www.cups.org/".
 */

/*
 * Include necessary headers...
 */

#include "cupsd.h"
#ifdef HAVE_ACL_INIT
#  include <sys/acl.h>
#  ifdef HAVE_MEMBERSHIP_H
#    include <membership.h>
#  endif /* HAVE_MEMBERSHIP_H */
#endif /* HAVE_ACL_INIT */


/*
 * Local functions...
 */

static int	ctcompare(const char *a, const char *b);


/*
 * 'cupsdAddCert()' - Add a certificate.
 */

void
cupsdAddCert(int        pid,		/* I - Process ID */
             const char *username,	/* I - Username */
             int        type)		/* I - AuthType for username */
{
  int		i;			/* Looping var */
  cupsd_cert_t	*cert;			/* Current certificate */
  int		fd;			/* Certificate file */
  char		filename[1024];		/* Certificate filename */
  static const char hex[] = "0123456789ABCDEF";
					/* Hex constants... */


  cupsdLogMessage(CUPSD_LOG_DEBUG, "cupsdAddCert: Adding certificate for PID %d", pid);

 /*
  * Allocate memory for the certificate...
  */

  if ((cert = calloc(sizeof(cupsd_cert_t), 1)) == NULL)
    return;

 /*
  * Fill in the certificate information...
  */

  cert->pid  = pid;
  cert->type = type;
  strlcpy(cert->username, username, sizeof(cert->username));

  for (i = 0; i < 32; i ++)
    cert->certificate[i] = hex[CUPS_RAND() & 15];

 /*
  * Save the certificate to a file readable only by the User and Group
  * (or root and SystemGroup for PID == 0)...
  */

  snprintf(filename, sizeof(filename), "%s/certs/%d", StateDir, pid);
  unlink(filename);

  if ((fd = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0400)) < 0)
  {
    cupsdLogMessage(CUPSD_LOG_ERROR,
                    "Unable to create certificate file %s - %s",
                    filename, strerror(errno));
    free(cert);
    return;
  }

  if (pid == 0)
  {
#ifdef HAVE_ACL_INIT
    acl_t		acl;		/* ACL information */
    acl_entry_t		entry;		/* ACL entry */
    acl_permset_t	permset;	/* Permissions */
#  ifdef HAVE_MBR_UID_TO_UUID
    uuid_t		group;		/* Group ID */
#  endif /* HAVE_MBR_UID_TO_UUID */
    static int		acls_not_supported = 0;
					/* Only warn once */
#endif /* HAVE_ACL_INIT */


   /*
    * Root certificate...
    */

    fchmod(fd, 0440);
    fchown(fd, RunUser, SystemGroupIDs[0]);

    cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdAddCert: NumSystemGroups=%d",
                    NumSystemGroups);

#ifdef HAVE_ACL_INIT
    if (NumSystemGroups > 1)
    {
     /*
      * Set POSIX ACLs for the root certificate so that all system
      * groups can access it...
      */

      int	j;			/* Looping var */

#  ifdef HAVE_MBR_UID_TO_UUID
     /*
      * On MacOS X, ACLs use UUIDs instead of GIDs...
      */

      acl = acl_init(NumSystemGroups - 1);

      for (i = 1; i < NumSystemGroups; i ++)
      {
       /*
        * Add each group ID to the ACL...
	*/

        for (j = 0; j < i; j ++)
	  if (SystemGroupIDs[j] == SystemGroupIDs[i])
            break;

        if (j < i)
          continue;			/* Skip duplicate groups */

        acl_create_entry(&acl, &entry);
	acl_get_permset(entry, &permset);
	acl_add_perm(permset, ACL_READ_DATA);
	acl_set_tag_type(entry, ACL_EXTENDED_ALLOW);
	mbr_gid_to_uuid((gid_t)SystemGroupIDs[i], group);
	acl_set_qualifier(entry, &group);
	acl_set_permset(entry, permset);
      }

#  else
     /*
      * POSIX ACLs need permissions for owner, group, other, and mask
      * in addition to the rest of the system groups...
      */

      acl = acl_init(NumSystemGroups + 3);

      /* Owner */
      acl_create_entry(&acl, &entry);
      acl_get_permset(entry, &permset);
      acl_add_perm(permset, ACL_READ);
      acl_set_tag_type(entry, ACL_USER_OBJ);
      acl_set_permset(entry, permset);

      /* Group */
      acl_create_entry(&acl, &entry);
      acl_get_permset(entry, &permset);
      acl_add_perm(permset, ACL_READ);
      acl_set_tag_type(entry, ACL_GROUP_OBJ);
      acl_set_permset(entry, permset);

      /* Others */
      acl_create_entry(&acl, &entry);
      acl_get_permset(entry, &permset);
      acl_add_perm(permset, 0);
      acl_set_tag_type(entry, ACL_OTHER);
      acl_set_permset(entry, permset);

      /* Mask */
      acl_create_entry(&acl, &entry);
      acl_get_permset(entry, &permset);
      acl_add_perm(permset, ACL_READ);
      acl_set_tag_type(entry, ACL_MASK);
      acl_set_permset(entry, permset);

      for (i = 1; i < NumSystemGroups; i ++)
      {
       /*
        * Add each group ID to the ACL...
	*/

        for (j = 0; j < i; j ++)
	  if (SystemGroupIDs[j] == SystemGroupIDs[i])
            break;

        if (j < i)
          continue;			/* Skip duplicate groups */

        acl_create_entry(&acl, &entry);
	acl_get_permset(entry, &permset);
	acl_add_perm(permset, ACL_READ);
	acl_set_tag_type(entry, ACL_GROUP);
	acl_set_qualifier(entry, SystemGroupIDs + i);
	acl_set_permset(entry, permset);
      }

      if (acl_valid(acl))
      {
        char *text, *textptr;		/* Temporary string */

        cupsdLogMessage(CUPSD_LOG_ERROR, "ACL did not validate: %s",
	                strerror(errno));
        text = acl_to_text(acl, NULL);
	for (textptr = strchr(text, '\n');
	     textptr;
	     textptr = strchr(textptr + 1, '\n'))
	  *textptr = ',';

	cupsdLogMessage(CUPSD_LOG_ERROR, "ACL: %s", text);
	acl_free(text);
      }
#  endif /* HAVE_MBR_UID_TO_UUID */

      if (acl_set_fd(fd, acl))
      {
	if (errno != EOPNOTSUPP || !acls_not_supported)
	  cupsdLogMessage(CUPSD_LOG_ERROR,
			  "Unable to set ACLs on root certificate \"%s\" - %s",
			  filename, strerror(errno));

	if (errno == EOPNOTSUPP)
	  acls_not_supported = 1;
      }

      acl_free(acl);
    }
#endif /* HAVE_ACL_INIT */

    RootCertTime = time(NULL);
  }
  else
  {
   /*
    * CGI certificate...
    */

    fchmod(fd, 0400);
    fchown(fd, User, Group);
  }

  DEBUG_printf(("ADD pid=%d, username=%s, cert=%s\n", pid, username,
                cert->certificate));

  write(fd, cert->certificate, strlen(cert->certificate));
  close(fd);

 /*
  * Insert the certificate at the front of the list...
  */

  cert->next = Certs;
  Certs      = cert;
}


/*
 * 'cupsdDeleteCert()' - Delete a single certificate.
 */

void
cupsdDeleteCert(int pid)		/* I - Process ID */
{
  cupsd_cert_t	*cert,			/* Current certificate */
		*prev;			/* Previous certificate */
  char		filename[1024];		/* Certificate file */


  for (prev = NULL, cert = Certs; cert != NULL; prev = cert, cert = cert->next)
    if (cert->pid == pid)
    {
     /*
      * Remove this certificate from the list...
      */

      cupsdLogMessage(CUPSD_LOG_DEBUG2,
                      "cupsdDeleteCert: Removing certificate for PID %d", pid);

      DEBUG_printf(("DELETE pid=%d, username=%s, cert=%s\n", cert->pid,
                    cert->username, cert->certificate));

      if (prev == NULL)
        Certs = cert->next;
      else
        prev->next = cert->next;

      free(cert);

     /*
      * Delete the file and return...
      */

      snprintf(filename, sizeof(filename), "%s/certs/%d", StateDir, pid);
      if (unlink(filename))
	cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to remove %s!", filename);

      return;
    }
}


/*
 * 'cupsdDeleteAllCerts()' - Delete all certificates...
 */

void
cupsdDeleteAllCerts(void)
{
  cupsd_cert_t	*cert,			/* Current certificate */
		*next;			/* Next certificate */
  char		filename[1024];		/* Certificate file */


 /*
  * Loop through each certificate, deleting them...
  */

  for (cert = Certs; cert != NULL; cert = next)
  {
   /*
    * Delete the file...
    */

    snprintf(filename, sizeof(filename), "%s/certs/%d", StateDir, cert->pid);
    if (unlink(filename))
      cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to remove %s!", filename);

   /*
    * Free memory...
    */

    next = cert->next;
    free(cert);
  }

  Certs        = NULL;
  RootCertTime = 0;
}


/*
 * 'cupsdFindCert()' - Find a certificate.
 */

cupsd_cert_t *				/* O - Matching certificate or NULL */
cupsdFindCert(const char *certificate)	/* I - Certificate */
{
  cupsd_cert_t	*cert;			/* Current certificate */


  cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdFindCert(certificate=%s)",
                  certificate);
  for (cert = Certs; cert != NULL; cert = cert->next)
    if (!ctcompare(certificate, cert->certificate))
    {
      cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdFindCert: Returning %s...",
                      cert->username);
      return (cert);
    }

  cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdFindCert: Certificate not found!");

  return (NULL);
}


/*
 * 'cupsdInitCerts()' - Initialize the certificate "system" and root
 *                      certificate.
 */

void
cupsdInitCerts(void)
{
#ifndef HAVE_ARC4RANDOM
  cups_file_t	*fp;			/* /dev/random file */


 /*
  * Initialize the random number generator using the random device or
  * the current time, as available...
  */

  if ((fp = cupsFileOpen("/dev/urandom", "rb")) == NULL)
  {
    struct timeval tod;			/* Time of day */

   /*
    * Get the time in usecs and use it as the initial seed...
    */

    gettimeofday(&tod, NULL);

    CUPS_SRAND((unsigned)(tod.tv_sec + tod.tv_usec));
  }
  else
  {
    unsigned	seed;			/* Seed for random number generator */

   /*
    * Read 4 random characters from the random device and use
    * them as the seed...
    */

    seed = (unsigned)cupsFileGetChar(fp);
    seed = (seed << 8) | (unsigned)cupsFileGetChar(fp);
    seed = (seed << 8) | (unsigned)cupsFileGetChar(fp);
    CUPS_SRAND((seed << 8) | (unsigned)cupsFileGetChar(fp));

    cupsFileClose(fp);
  }
#endif /* !HAVE_ARC4RANDOM */

 /*
  * Create a root certificate and return...
  */

  if (!RunUser)
    cupsdAddCert(0, "root", cupsdDefaultAuthType());
}


/*
 * 'ctcompare()' - Compare two strings in constant time.
 */

static int				/* O - 0 on match, non-zero on non-match */
ctcompare(const char *a,		/* I - First string */
          const char *b)		/* I - Second string */
{
  int	result = 0;			/* Result */


  while (*a && *b)
    result |= *a ^ *b;

  return (result);
}


/*
 * End of "$Id$".
 */
Commit	Line	Data
ef416fc2	1	/*
f2d18633	2	* "$Id$"
ef416fc2	3	*
7e86f2f6	4	* Authentication certificate routines for the CUPS scheduler.
ef416fc2	5	*
1b6c7278	6	* Copyright 2007-2015 by Apple Inc.
7e86f2f6	7	* Copyright 1997-2006 by Easy Software Products.
ef416fc2	8	*
7e86f2f6 MS	9	* These coded instructions, statements, and computer programs are the
	10	* property of Apple Inc. and are protected by Federal copyright
	11	* law. Distribution and use rights are outlined in the file "LICENSE.txt"
	12	* which should have been included with this file. If this file is
	13	* file is missing or damaged, see the license at "http://www.cups.org/".
ef416fc2	14	*/
	15
	16	/*
	17	* Include necessary headers...
	18	*/
	19
	20	#include "cupsd.h"
fa73b229	21	#ifdef HAVE_ACL_INIT
fa73b229	22	# include <sys/acl.h>
bd7854cb	23	# ifdef HAVE_MEMBERSHIP_H
	24	# include <membership.h>
	25	# endif /* HAVE_MEMBERSHIP_H */
fa73b229	26	#endif /* HAVE_ACL_INIT */
ef416fc2	27
ef416fc2	28
1b6c7278 MS	29	/*
	30	* Local functions...
	31	*/
	32
	33	static int ctcompare(const char a, const char b);
	34
	35
ef416fc2	36	/*
	37	* 'cupsdAddCert()' - Add a certificate.
	38	*/
	39
	40	void
	41	cupsdAddCert(int pid, /* I - Process ID */
5bd77a73	42	const char username, / I - Username */
0fa6c7fa	43	int type) /* I - AuthType for username */
ef416fc2	44	{
	45	int i; /* Looping var */
	46	cupsd_cert_t cert; / Current certificate */
	47	int fd; /* Certificate file */
	48	char filename[1024]; /* Certificate filename */
	49	static const char hex[] = "0123456789ABCDEF";
	50	/* Hex constants... */
	51
	52
6c2b2b19	53	cupsdLogMessage(CUPSD_LOG_DEBUG, "cupsdAddCert: Adding certificate for PID %d", pid);
ef416fc2	54
	55	/*
	56	* Allocate memory for the certificate...
	57	*/
	58
	59	if ((cert = calloc(sizeof(cupsd_cert_t), 1)) == NULL)
	60	return;
	61
	62	/*
	63	* Fill in the certificate information...
	64	*/
	65
0fa6c7fa MS	66	cert->pid = pid;
0fa6c7fa MS	67	cert->type = type;
ef416fc2	68	strlcpy(cert->username, username, sizeof(cert->username));
	69
	70	for (i = 0; i < 32; i ++)
41681883	71	cert->certificate[i] = hex[CUPS_RAND() & 15];
ef416fc2	72
	73	/*
	74	* Save the certificate to a file readable only by the User and Group
	75	* (or root and SystemGroup for PID == 0)...
	76	*/
	77
	78	snprintf(filename, sizeof(filename), "%s/certs/%d", StateDir, pid);
	79	unlink(filename);
	80
	81	if ((fd = open(filename, O_WRONLY \| O_CREAT \| O_EXCL, 0400)) < 0)
	82	{
	83	cupsdLogMessage(CUPSD_LOG_ERROR,
b9faaae1	84	"Unable to create certificate file %s - %s",
ef416fc2	85	filename, strerror(errno));
	86	free(cert);
	87	return;
	88	}
	89
	90	if (pid == 0)
	91	{
fa73b229	92	#ifdef HAVE_ACL_INIT
	93	acl_t acl; /* ACL information */
	94	acl_entry_t entry; /* ACL entry */
	95	acl_permset_t permset; /* Permissions */
bd7854cb	96	# ifdef HAVE_MBR_UID_TO_UUID
fa73b229	97	uuid_t group; /* Group ID */
bd7854cb	98	# endif /* HAVE_MBR_UID_TO_UUID */
e53920b9	99	static int acls_not_supported = 0;
e53920b9	100	/* Only warn once */
fa73b229	101	#endif /* HAVE_ACL_INIT */
	102
	103
ef416fc2	104	/*
	105	* Root certificate...
	106	*/
	107
	108	fchmod(fd, 0440);
	109	fchown(fd, RunUser, SystemGroupIDs[0]);
	110
bd7854cb	111	cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdAddCert: NumSystemGroups=%d",
	112	NumSystemGroups);
	113
fa73b229	114	#ifdef HAVE_ACL_INIT
	115	if (NumSystemGroups > 1)
	116	{
	117	/*
	118	* Set POSIX ACLs for the root certificate so that all system
	119	* groups can access it...
	120	*/
	121
12f89d24 MS	122	int j; /* Looping var */
12f89d24 MS	123
bd7854cb	124	# ifdef HAVE_MBR_UID_TO_UUID
	125	/*
	126	* On MacOS X, ACLs use UUIDs instead of GIDs...
	127	*/
	128
fa73b229	129	acl = acl_init(NumSystemGroups - 1);
	130
	131	for (i = 1; i < NumSystemGroups; i ++)
	132	{
	133	/*
	134	* Add each group ID to the ACL...
	135	*/
	136
12f89d24 MS	137	for (j = 0; j < i; j ++)
	138	if (SystemGroupIDs[j] == SystemGroupIDs[i])
	139	break;
	140
	141	if (j < i)
	142	continue; /* Skip duplicate groups */
	143
fa73b229	144	acl_create_entry(&acl, &entry);
	145	acl_get_permset(entry, &permset);
	146	acl_add_perm(permset, ACL_READ_DATA);
	147	acl_set_tag_type(entry, ACL_EXTENDED_ALLOW);
	148	mbr_gid_to_uuid((gid_t)SystemGroupIDs[i], group);
	149	acl_set_qualifier(entry, &group);
	150	acl_set_permset(entry, permset);
	151	}
12f89d24	152
bd7854cb	153	# else
	154	/*
	155	* POSIX ACLs need permissions for owner, group, other, and mask
	156	* in addition to the rest of the system groups...
	157	*/
	158
	159	acl = acl_init(NumSystemGroups + 3);
	160
	161	/* Owner */
	162	acl_create_entry(&acl, &entry);
	163	acl_get_permset(entry, &permset);
	164	acl_add_perm(permset, ACL_READ);
	165	acl_set_tag_type(entry, ACL_USER_OBJ);
	166	acl_set_permset(entry, permset);
	167
	168	/* Group */
	169	acl_create_entry(&acl, &entry);
	170	acl_get_permset(entry, &permset);
	171	acl_add_perm(permset, ACL_READ);
	172	acl_set_tag_type(entry, ACL_GROUP_OBJ);
	173	acl_set_permset(entry, permset);
	174
	175	/* Others */
	176	acl_create_entry(&acl, &entry);
	177	acl_get_permset(entry, &permset);
4744bd90	178	acl_add_perm(permset, 0);
bd7854cb	179	acl_set_tag_type(entry, ACL_OTHER);
	180	acl_set_permset(entry, permset);
	181
	182	/* Mask */
	183	acl_create_entry(&acl, &entry);
	184	acl_get_permset(entry, &permset);
	185	acl_add_perm(permset, ACL_READ);
	186	acl_set_tag_type(entry, ACL_MASK);
	187	acl_set_permset(entry, permset);
	188
	189	for (i = 1; i < NumSystemGroups; i ++)
	190	{
	191	/*
	192	* Add each group ID to the ACL...
	193	*/
	194
12f89d24 MS	195	for (j = 0; j < i; j ++)
	196	if (SystemGroupIDs[j] == SystemGroupIDs[i])
	197	break;
	198
	199	if (j < i)
	200	continue; /* Skip duplicate groups */
	201
bd7854cb	202	acl_create_entry(&acl, &entry);
	203	acl_get_permset(entry, &permset);
	204	acl_add_perm(permset, ACL_READ);
	205	acl_set_tag_type(entry, ACL_GROUP);
	206	acl_set_qualifier(entry, SystemGroupIDs + i);
	207	acl_set_permset(entry, permset);
	208	}
	209
	210	if (acl_valid(acl))
	211	{
e53920b9	212	char text, textptr; /* Temporary string */
e53920b9	213
bd7854cb	214	cupsdLogMessage(CUPSD_LOG_ERROR, "ACL did not validate: %s",
	215	strerror(errno));
	216	text = acl_to_text(acl, NULL);
	217	for (textptr = strchr(text, '\n');
	218	textptr;
	219	textptr = strchr(textptr + 1, '\n'))
	220	*textptr = ',';
	221
	222	cupsdLogMessage(CUPSD_LOG_ERROR, "ACL: %s", text);
a2326b5b	223	acl_free(text);
bd7854cb	224	}
bd7854cb	225	# endif /* HAVE_MBR_UID_TO_UUID */
fa73b229	226
fa73b229	227	if (acl_set_fd(fd, acl))
e53920b9	228	{
	229	if (errno != EOPNOTSUPP \|\| !acls_not_supported)
	230	cupsdLogMessage(CUPSD_LOG_ERROR,
	231	"Unable to set ACLs on root certificate \"%s\" - %s",
	232	filename, strerror(errno));
	233
	234	if (errno == EOPNOTSUPP)
	235	acls_not_supported = 1;
	236	}
	237
fa73b229	238	acl_free(acl);
	239	}
	240	#endif /* HAVE_ACL_INIT */
	241
ef416fc2	242	RootCertTime = time(NULL);
	243	}
	244	else
	245	{
	246	/*
	247	* CGI certificate...
	248	*/
	249
	250	fchmod(fd, 0400);
	251	fchown(fd, User, Group);
	252	}
	253
	254	DEBUG_printf(("ADD pid=%d, username=%s, cert=%s\n", pid, username,
	255	cert->certificate));
	256
	257	write(fd, cert->certificate, strlen(cert->certificate));
	258	close(fd);
	259
	260	/*
	261	* Insert the certificate at the front of the list...
	262	*/
	263
	264	cert->next = Certs;
	265	Certs = cert;
	266	}
	267
	268
	269	/*
	270	* 'cupsdDeleteCert()' - Delete a single certificate.
	271	*/
	272
	273	void
	274	cupsdDeleteCert(int pid) /* I - Process ID */
	275	{
	276	cupsd_cert_t cert, / Current certificate */
	277	prev; / Previous certificate */
	278	char filename[1024]; /* Certificate file */
	279
	280
	281	for (prev = NULL, cert = Certs; cert != NULL; prev = cert, cert = cert->next)
	282	if (cert->pid == pid)
	283	{
	284	/*
	285	* Remove this certificate from the list...
	286	*/
	287
	288	cupsdLogMessage(CUPSD_LOG_DEBUG2,
b9faaae1	289	"cupsdDeleteCert: Removing certificate for PID %d", pid);
ef416fc2	290
	291	DEBUG_printf(("DELETE pid=%d, username=%s, cert=%s\n", cert->pid,
	292	cert->username, cert->certificate));
	293
	294	if (prev == NULL)
	295	Certs = cert->next;
	296	else
	297	prev->next = cert->next;
	298
	299	free(cert);
	300
	301	/*
	302	* Delete the file and return...
	303	*/
	304
	305	snprintf(filename, sizeof(filename), "%s/certs/%d", StateDir, pid);
	306	if (unlink(filename))
b9faaae1	307	cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to remove %s!", filename);
ef416fc2	308
	309	return;
	310	}
	311	}
	312
	313
	314	/*
	315	* 'cupsdDeleteAllCerts()' - Delete all certificates...
	316	*/
	317
	318	void
	319	cupsdDeleteAllCerts(void)
	320	{
	321	cupsd_cert_t cert, / Current certificate */
	322	next; / Next certificate */
	323	char filename[1024]; /* Certificate file */
	324
	325
	326	/*
	327	* Loop through each certificate, deleting them...
	328	*/
	329
	330	for (cert = Certs; cert != NULL; cert = next)
	331	{
	332	/*
	333	* Delete the file...
	334	*/
	335
	336	snprintf(filename, sizeof(filename), "%s/certs/%d", StateDir, cert->pid);
	337	if (unlink(filename))
b9faaae1	338	cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to remove %s!", filename);
ef416fc2	339
	340	/*
	341	* Free memory...
	342	*/
	343
	344	next = cert->next;
	345	free(cert);
	346	}
	347
e1d6a774	348	Certs = NULL;
e1d6a774	349	RootCertTime = 0;
ef416fc2	350	}
	351
	352
	353	/*
	354	* 'cupsdFindCert()' - Find a certificate.
	355	*/
	356
db0bd74a	357	cupsd_cert_t * /* O - Matching certificate or NULL */
ef416fc2	358	cupsdFindCert(const char certificate) / I - Certificate */
	359	{
	360	cupsd_cert_t cert; / Current certificate */
	361
	362
b9faaae1 MS	363	cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdFindCert(certificate=%s)",
b9faaae1 MS	364	certificate);
ef416fc2	365	for (cert = Certs; cert != NULL; cert = cert->next)
1b6c7278	366	if (!ctcompare(certificate, cert->certificate))
ef416fc2	367	{
b9faaae1 MS	368	cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdFindCert: Returning %s...",
b9faaae1 MS	369	cert->username);
db0bd74a	370	return (cert);
ef416fc2	371	}
ef416fc2	372
b9faaae1	373	cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdFindCert: Certificate not found!");
ef416fc2	374
	375	return (NULL);
	376	}
	377
	378
	379	/*
	380	* 'cupsdInitCerts()' - Initialize the certificate "system" and root
	381	* certificate.
	382	*/
	383
	384	void
	385	cupsdInitCerts(void)
	386	{
f8b3a85b	387	#ifndef HAVE_ARC4RANDOM
ef416fc2	388	cups_file_t fp; / /dev/random file */
ef416fc2	389
	390
	391	/*
	392	* Initialize the random number generator using the random device or
	393	* the current time, as available...
	394	*/
	395
	396	if ((fp = cupsFileOpen("/dev/urandom", "rb")) == NULL)
	397	{
f8b3a85b MS	398	struct timeval tod; /* Time of day */
f8b3a85b MS	399
ef416fc2	400	/*
	401	* Get the time in usecs and use it as the initial seed...
	402	*/
	403
	404	gettimeofday(&tod, NULL);
	405
f8b3a85b	406	CUPS_SRAND((unsigned)(tod.tv_sec + tod.tv_usec));
ef416fc2	407	}
	408	else
	409	{
f8b3a85b MS	410	unsigned seed; /* Seed for random number generator */
f8b3a85b MS	411
ef416fc2	412	/*
	413	* Read 4 random characters from the random device and use
	414	* them as the seed...
	415	*/
	416
07623986 MS	417	seed = (unsigned)cupsFileGetChar(fp);
	418	seed = (seed << 8) \| (unsigned)cupsFileGetChar(fp);
	419	seed = (seed << 8) \| (unsigned)cupsFileGetChar(fp);
	420	CUPS_SRAND((seed << 8) \| (unsigned)cupsFileGetChar(fp));
ef416fc2	421
	422	cupsFileClose(fp);
	423	}
f8b3a85b	424	#endif /* !HAVE_ARC4RANDOM */
ef416fc2	425
	426	/*
	427	* Create a root certificate and return...
	428	*/
	429
	430	if (!RunUser)
0fa6c7fa	431	cupsdAddCert(0, "root", cupsdDefaultAuthType());
ef416fc2	432	}
	433
	434
1b6c7278 MS	435	/*
	436	* 'ctcompare()' - Compare two strings in constant time.
	437	*/
	438
	439	static int /* O - 0 on match, non-zero on non-match */
	440	ctcompare(const char a, / I - First string */
	441	const char b) / I - Second string */
	442	{
	443	int result = 0; /* Result */
	444
	445
	446	while (a && b)
	447	result \|= a ^ b;
	448
	449	return (result);
	450	}
	451
	452
ef416fc2	453	/*
f2d18633	454	* End of "$Id$".
ef416fc2	455	*/