[thirdparty/cups.git] / cups / auth.c

/*
 * "$Id: auth.c 6253 2007-02-10 18:48:40Z mike $"
 *
 *   Authentication functions for the Common UNIX Printing System (CUPS).
 *
 *   Copyright 1997-2007 by Easy Software Products.
 *
 *   This file contains Kerberos support code, copyright 2006 by
 *   Jelmer Vernooij.
 *
 *   These coded instructions, statements, and computer programs are the
 *   property of Easy Software Products 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 missing or damaged please contact Easy Software Products
 *   at:
 *
 *       Attn: CUPS Licensing Information
 *       Easy Software Products
 *       44141 Airport View Drive, Suite 204
 *       Hollywood, Maryland 20636 USA
 *
 *       Voice: (301) 373-9600
 *       EMail: cups-info@cups.org
 *         WWW: http://www.cups.org
 *
 *   This file is subject to the Apple OS-Developed Software exception.
 *
 * Contents:
 *
 *   cupsDoAuthentication() - Authenticate a request.
 *   DEBUG_gss_printf()     - Show debug error messages from GSSAPI...
 *   cups_get_gss_creds()   - Get CUPS service credentials for authentication.
 *   cups_local_auth()      - Get the local authorization certificate if
 *                            available/applicable...
 */

/*
 * Include necessary headers...
 */

#include "globals.h"
#include "debug.h"
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#if defined(WIN32) || defined(__EMX__)
#  include <io.h>
#else
#  include <unistd.h>
#endif /* WIN32 || __EMX__ */

#if HAVE_AUTHORIZATION_H
#  include <Security/Authorization.h>
#  ifdef HAVE_SECBASEPRIV_H
#    include <Security/SecBasePriv.h>
#  else
extern const char *cssmErrorString(int error);
#  endif /* HAVE_SECBASEPRIV_H */
#endif /* HAVE_AUTHORIZATION_H */


/*
 * Local functions...
 */

#ifdef HAVE_GSSAPI
#  ifdef DEBUG
static void	DEBUG_gss_printf(OM_uint32 major_status, OM_uint32 minor_status,
				 const char *message);
#  endif /* DEBUG  */
static gss_name_t cups_get_gss_creds(http_t *http, const char *service_name);
#endif /* HAVE_GSSAPI */
static int	cups_local_auth(http_t *http);


/*
 * 'cupsDoAuthentication()' - Authenticate a request.
 *
 * This function should be called in response to a HTTP_UNAUTHORIZED
 * status, prior to resubmitting your request.
 *
 * @since CUPS 1.1.20@
 */

int					/* O - 0 on success, -1 on error */
cupsDoAuthentication(http_t     *http,	/* I - HTTP connection to server */
                     const char *method,/* I - Request method (GET, POST, PUT) */
		     const char *resource)
					/* I - Resource path */
{
  const char	*password;		/* Password string */
  char		prompt[1024],		/* Prompt for user */
		realm[HTTP_MAX_VALUE],	/* realm="xyz" string */
		nonce[HTTP_MAX_VALUE],	/* nonce="xyz" string */
		encode[2048];		/* Encoded username:password */
  int		localauth;		/* Local authentication result */
  _cups_globals_t *cg;			/* Global data */


  DEBUG_printf(("cupsDoAuthentication(http=%p, method=\"%s\", resource=\"%s\")\n",
                http, method, resource));
  DEBUG_printf(("cupsDoAuthentication: digest_tries=%d, userpass=\"%s\"\n",
                http->digest_tries, http->userpass));
  DEBUG_printf(("cupsDoAuthentication: WWW-Authenticate=\"%s\"\n",
                httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE)));

 /*
  * Clear the current authentication string...
  */

  http->_authstring[0] = '\0';

  if (http->authstring && http->authstring != http->_authstring)
    free(http->authstring);

  http->authstring = http->_authstring;

 /*
  * See if we can do local authentication...
  */

  if (http->digest_tries < 3)
  {
    if ((localauth = cups_local_auth(http)) == 0)
    {
      DEBUG_printf(("cupsDoAuthentication: authstring=\"%s\"\n",
                    http->authstring));
  
      if (http->status == HTTP_UNAUTHORIZED)
	http->digest_tries ++;
  
      return (0);
    }
    else if (localauth == -1)
      return (-1);			/* Error or canceled */
  }

 /*
  * Nope, see if we should retry the current username:password...
  */

  if ((http->digest_tries > 1 || !http->userpass[0]) &&
      strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9))
  {
   /*
    * Nope - get a new password from the user...
    */

    cg = _cupsGlobals();

    if (!cg->lang_default)
      cg->lang_default = cupsLangDefault();

    snprintf(prompt, sizeof(prompt),
             _cupsLangString(cg->lang_default, _("Password for %s on %s? ")),
	     cupsUser(),
	     http->hostname[0] == '/' ? "localhost" : http->hostname);

    http->digest_tries  = strncasecmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE],
                                      "Digest", 5) != 0;
    http->userpass[0]   = '\0';

    if ((password = cupsGetPassword(prompt)) == NULL)
      return (-1);

    if (!password[0])
      return (-1);

    snprintf(http->userpass, sizeof(http->userpass), "%s:%s", cupsUser(),
             password);
  }
  else if (http->status == HTTP_UNAUTHORIZED)
    http->digest_tries ++;

 /*
  * Got a password; encode it for the server...
  */

  if (!strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9))
  {
#ifdef HAVE_GSSAPI
   /*
    * Kerberos authentication...
    */

    OM_uint32		minor_status,	/* Minor status code */
			major_status;	/* Major status code */
    gss_buffer_desc	output_token = GSS_C_EMPTY_BUFFER,
					/* Output token */
			input_token = GSS_C_EMPTY_BUFFER;
					/* Input token */
    char		*gss_service_name;
					/* GSS service name */
    const char		*authorization;
					/* Pointer into Authorization string */


    if (http->gssname == GSS_C_NO_NAME)
    {
      if ((gss_service_name = getenv("CUPS_GSSSERVICENAME")) == NULL)
	gss_service_name = CUPS_DEFAULT_GSSSERVICENAME;
      else
	DEBUG_puts("cupsDoAuthentication: GSS service name set via environment");

      http->gssname = cups_get_gss_creds(http, gss_service_name);
    }

   /*
    * Find the start of the Kerberos input token...
    */

    authorization = httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE);

    authorization += 9;
    while (*authorization && isspace(*authorization & 255))
      authorization ++;

    if (*authorization)
    {
     /*
      * For SPNEGO, this is where we'll feed the server's authorization data
      * back into gss via input_token...
      */
    }
    else
    {
      if (http->gssctx != GSS_C_NO_CONTEXT)
      {
	major_status = gss_delete_sec_context(&minor_status, &http->gssctx,
	                                      GSS_C_NO_BUFFER);
	http->gssctx = GSS_C_NO_CONTEXT;
      }
    }

    major_status  = gss_init_sec_context(&minor_status, GSS_C_NO_CREDENTIAL,
					 &http->gssctx,
					 http->gssname, http->gssmech,
					 GSS_C_MUTUAL_FLAG, GSS_C_INDEFINITE,
					 GSS_C_NO_CHANNEL_BINDINGS,
					 &input_token, &http->gssmech,
					 &output_token, NULL, NULL);

    if (input_token.value)
      free(input_token.value);

    if (GSS_ERROR(major_status))
    {
#  ifdef DEBUG
      DEBUG_gss_printf(major_status, minor_status,
		       "Unable to initialise security context");
#  endif /* DEBUG */
      return (-1);
    }

#  ifdef DEBUG
    if (major_status == GSS_S_CONTINUE_NEEDED)
      DEBUG_gss_printf(major_status, minor_status, "Continuation needed!");
#  endif /* DEBUG */

    if (output_token.length)
    {
      httpEncode64_2(encode, sizeof(encode), output_token.value,
		     output_token.length);

      http->authstring = malloc(strlen(encode) + 11);
      sprintf(http->authstring, "Negotiate %s", encode); /* Safe because allocated */
 
      major_status = gss_release_buffer(&minor_status, &output_token);
    }

   /*
    * Copy back what we can to _authstring for backwards compatibility...
    */

    strlcpy(http->_authstring, http->authstring, sizeof(http->_authstring));
#endif /* HAVE_GSSAPI */
  }
  else if (strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Digest", 6))
  {
   /*
    * Basic authentication...
    */

    httpEncode64_2(encode, sizeof(encode), http->userpass,
                   (int)strlen(http->userpass));
    snprintf(http->_authstring, sizeof(http->_authstring), "Basic %s", encode);
  }
  else
  {
   /*
    * Digest authentication...
    */

    httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "realm", realm);
    httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "nonce", nonce);

    httpMD5(cupsUser(), realm, strchr(http->userpass, ':') + 1, encode);
    httpMD5Final(nonce, method, resource, encode);
    snprintf(http->_authstring, sizeof(http->_authstring),
	     "Digest username=\"%s\", realm=\"%s\", nonce=\"%s\", "
	     "uri=\"%s\", response=\"%s\"", cupsUser(), realm, nonce,
	     resource, encode);
  }

  DEBUG_printf(("cupsDoAuthentication: authstring=\"%s\"\n", http->authstring));

  return (0);
}


#ifdef HAVE_GSSAPI
#  ifdef DEBUG
/*
 * 'DEBUG_gss_printf()' - Show debug error messages from GSSAPI...
 */

static void
DEBUG_gss_printf(OM_uint32 major_status,/* I - Major status code */
                 OM_uint32 minor_status,/* I - Minor status code */
		 const char *message)	/* I - Prefix for error message */
{
  OM_uint32	err_major_status,	/* Major status code for display */
		err_minor_status;	/* Minor status code for display */
  OM_uint32	msg_ctx;		/* Message context */
  gss_buffer_desc major_status_string = GSS_C_EMPTY_BUFFER,
					/* Major status message */
		minor_status_string = GSS_C_EMPTY_BUFFER;
					/* Minor status message */


  msg_ctx          = 0;
  err_major_status = gss_display_status(&err_minor_status,
	                        	major_status,
					GSS_C_GSS_CODE,
					GSS_C_NO_OID,
					&msg_ctx,
					&major_status_string);

  if (!GSS_ERROR(err_major_status))
    err_major_status = gss_display_status(&err_minor_status,
	                        	  minor_status,
					  GSS_C_MECH_CODE,
					  GSS_C_NULL_OID,
					  &msg_ctx,
					  &minor_status_string);

  printf("%s: %s, %s\n", message, (char *)major_status_string.value,
	 (char *)minor_status_string.value);

  gss_release_buffer(&err_minor_status, &major_status_string);
  gss_release_buffer(&err_minor_status, &minor_status_string);
}
#  endif /* DEBUG */


/*
 * 'cups_get_gss_creds()' - Get CUPS service credentials for authentication.
 */

static gss_name_t			/* O - Server name */
cups_get_gss_creds(
    http_t     *http,			/* I - Connection to server */
    const char *service_name)		/* I - Service name */
{
  gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
					/* Service token */
  OM_uint32	major_status,		/* Major status code */
		minor_status;		/* Minor status code */
  gss_name_t	server_name;		/* Server name */
  char		buf[1024],		/* Name buffer */
		fqdn[HTTP_MAX_URI];	/* Server name buffer */


 /*
  * Get a server name we can use for authentication purposes...
  */

  snprintf(buf, sizeof(buf), "%s@%s", service_name,
	   httpGetHostname(http, fqdn, sizeof(fqdn)));

  token.value  = buf;
  token.length = strlen(buf);
  server_name  = GSS_C_NO_NAME;
  major_status = gss_import_name(&minor_status, &token,
	 			 GSS_C_NT_HOSTBASED_SERVICE,
				 &server_name);

  if (GSS_ERROR(major_status))
  {
#  ifdef DEBUG
    DEBUG_gss_printf(major_status, minor_status, "gss_import_name() failed");
#  endif /* DEBUG */

    return (NULL);
  }

  return (server_name);
}
#endif /* HAVE_GSSAPI */


/*
 * 'cups_local_auth()' - Get the local authorization certificate if
 *                       available/applicable...
 */

static int				/* O - 0 if available */
					/*     1 if not  available */
					/*    -1 error */
cups_local_auth(http_t *http)		/* I - HTTP connection to server */
{
#if defined(WIN32) || defined(__EMX__)
 /*
  * Currently WIN32 and OS-2 do not support the CUPS server...
  */

  return (-1);
#else
  int			pid;		/* Current process ID */
  FILE			*fp;		/* Certificate file */
  char			filename[1024],	/* Certificate filename */
			certificate[33];/* Certificate string */
  _cups_globals_t *cg = _cupsGlobals();	/* Global data */
#if defined(HAVE_AUTHORIZATION_H)
  OSStatus		status;		/* Status */
  AuthorizationItem	auth_right;	/* Authorization right */
  AuthorizationRights	auth_rights;	/* Authorization rights */
  AuthorizationFlags	auth_flags;	/* Authorization flags */
  AuthorizationExternalForm auth_extrn;	/* Authorization ref external */
  char			auth_key[1024];	/* Buffer */
  char			buffer[1024];	/* Buffer */
#endif /* HAVE_AUTHORIZATION_H */


  DEBUG_printf(("cups_local_auth(http=%p) hostaddr=%s, hostname=\"%s\"\n",
                http, httpAddrString(http->hostaddr, filename, sizeof(filename)), http->hostname));

 /*
  * See if we are accessing localhost...
  */

  if (!httpAddrLocalhost(http->hostaddr) &&
      strcasecmp(http->hostname, "localhost") != 0)
  {
    DEBUG_puts("cups_local_auth: Not a local connection!");
    return (-1);
  }

#if defined(HAVE_AUTHORIZATION_H)
 /*
  * Delete any previous authorization reference...
  */
  
  if (cg->auth_ref)
  {
    AuthorizationFree(cg->auth_ref, kAuthorizationFlagDefaults);
    cg->auth_ref = NULL;
  }

  if (httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey", 
		       auth_key, sizeof(auth_key)))
  {
    status = AuthorizationCreate(NULL, kAuthorizationEmptyEnvironment, 
				 kAuthorizationFlagDefaults, &cg->auth_ref);
    if (status != errAuthorizationSuccess)
    {
      DEBUG_printf(("cups_local_auth: AuthorizationCreate() returned %d (%s)\n",
		    (int)status, cssmErrorString(status)));
      return (-1);
    }

    auth_right.name        = auth_key;
    auth_right.valueLength = 0;
    auth_right.value       = NULL;
    auth_right.flags       = 0;

    auth_rights.count = 1;
    auth_rights.items = &auth_right;

    auth_flags = kAuthorizationFlagDefaults | 
		 kAuthorizationFlagPreAuthorize |
		 kAuthorizationFlagInteractionAllowed | 
		 kAuthorizationFlagExtendRights;

    status = AuthorizationCopyRights(cg->auth_ref, &auth_rights, 
				     kAuthorizationEmptyEnvironment, 
				     auth_flags, NULL);
    if (status == errAuthorizationSuccess)
      status = AuthorizationMakeExternalForm(cg->auth_ref, &auth_extrn);

    if (status == errAuthorizationSuccess)
    {
     /*
      * Set the authorization string and return...
      */

      httpEncode64_2(buffer, sizeof(buffer), (void *)&auth_extrn, 
		     sizeof(auth_extrn));

      http->authstring = malloc(strlen(buffer) + 9);
      sprintf(http->authstring, "AuthRef %s", buffer);

      /* Copy back to _authstring for backwards compatibility */
      strlcpy(http->_authstring, http->authstring, sizeof(http->_authstring));

      DEBUG_printf(("cups_local_auth: Returning authstring = \"%s\"\n",
		    http->authstring));
      return (0);
    }
    else if (status == errAuthorizationCanceled)
      return (-1);

    DEBUG_printf(("cups_local_auth: AuthorizationCopyRights() returned %d (%s)\n",
		  (int)status, cssmErrorString(status)));

  /*
   * Fall through to try certificates...
   */
  }
#endif /* HAVE_AUTHORIZATION_H */

 /*
  * Try opening a certificate file for this PID.  If that fails,
  * try the root certificate...
  */

  pid = getpid();
  snprintf(filename, sizeof(filename), "%s/certs/%d", cg->cups_statedir, pid);
  if ((fp = fopen(filename, "r")) == NULL && pid > 0)
  {
    DEBUG_printf(("cups_local_auth: Unable to open file %s: %s\n",
                  filename, strerror(errno)));

    snprintf(filename, sizeof(filename), "%s/certs/0", cg->cups_statedir);
    fp = fopen(filename, "r");
  }

  if (fp)
  {
   /*
    * Read the certificate from the file...
    */

    fgets(certificate, sizeof(certificate), fp);
    fclose(fp);

   /*
    * Set the authorization string and return...
    */

    http->authstring = malloc(strlen(certificate) + 10);
    sprintf(http->authstring, "Local %s", certificate);

    /* Copy back to _authstring for backwards compatibility */
    strlcpy(http->_authstring, http->authstring, sizeof(http->_authstring));

    DEBUG_printf(("cups_local_auth: Returning authstring = \"%s\"\n",
		  http->authstring));

    return (0);
  }

  return (1);
#endif /* WIN32 || __EMX__ */
}


/*
 * End of "$Id: auth.c 6253 2007-02-10 18:48:40Z mike $".
 */
Commit	Line	Data
ef416fc2	1	/*
f7deaa1a	2	* "$Id: auth.c 6253 2007-02-10 18:48:40Z mike $"
ef416fc2	3	*
	4	* Authentication functions for the Common UNIX Printing System (CUPS).
	5	*
b86bc4cf	6	* Copyright 1997-2007 by Easy Software Products.
ef416fc2	7	*
f7deaa1a	8	* This file contains Kerberos support code, copyright 2006 by
	9	* Jelmer Vernooij.
	10	*
ef416fc2	11	* These coded instructions, statements, and computer programs are the
	12	* property of Easy Software Products and are protected by Federal
	13	* copyright law. Distribution and use rights are outlined in the file
	14	* "LICENSE.txt" which should have been included with this file. If this
	15	* file is missing or damaged please contact Easy Software Products
	16	* at:
	17	*
	18	* Attn: CUPS Licensing Information
	19	* Easy Software Products
	20	* 44141 Airport View Drive, Suite 204
	21	* Hollywood, Maryland 20636 USA
	22	*
	23	* Voice: (301) 373-9600
	24	* EMail: cups-info@cups.org
	25	* WWW: http://www.cups.org
	26	*
	27	* This file is subject to the Apple OS-Developed Software exception.
	28	*
	29	* Contents:
	30	*
	31	* cupsDoAuthentication() - Authenticate a request.
f7deaa1a	32	* DEBUG_gss_printf() - Show debug error messages from GSSAPI...
f7deaa1a	33	* cups_get_gss_creds() - Get CUPS service credentials for authentication.
ef416fc2	34	* cups_local_auth() - Get the local authorization certificate if
	35	* available/applicable...
	36	*/
	37
	38	/*
	39	* Include necessary headers...
	40	*/
	41
	42	#include "globals.h"
	43	#include "debug.h"
	44	#include <stdlib.h>
	45	#include <ctype.h>
	46	#include <errno.h>
	47	#include <fcntl.h>
	48	#include <sys/stat.h>
	49	#if defined(WIN32) \|\| defined(__EMX__)
	50	# include <io.h>
	51	#else
	52	# include <unistd.h>
	53	#endif /* WIN32 \|\| __EMX__ */
	54
f7deaa1a	55	#if HAVE_AUTHORIZATION_H
	56	# include <Security/Authorization.h>
	57	# ifdef HAVE_SECBASEPRIV_H
	58	# include <Security/SecBasePriv.h>
	59	# else
	60	extern const char *cssmErrorString(int error);
	61	# endif /* HAVE_SECBASEPRIV_H */
	62	#endif /* HAVE_AUTHORIZATION_H */
	63
ef416fc2	64
	65	/*
	66	* Local functions...
	67	*/
	68
f7deaa1a	69	#ifdef HAVE_GSSAPI
	70	# ifdef DEBUG
	71	static void DEBUG_gss_printf(OM_uint32 major_status, OM_uint32 minor_status,
	72	const char *message);
	73	# endif /* DEBUG */
	74	static gss_name_t cups_get_gss_creds(http_t http, const char service_name);
	75	#endif /* HAVE_GSSAPI */
ef416fc2	76	static int cups_local_auth(http_t *http);
	77
	78
	79	/*
	80	* 'cupsDoAuthentication()' - Authenticate a request.
	81	*
	82	* This function should be called in response to a HTTP_UNAUTHORIZED
	83	* status, prior to resubmitting your request.
	84	*
	85	* @since CUPS 1.1.20@
	86	*/
	87
	88	int /* O - 0 on success, -1 on error */
	89	cupsDoAuthentication(http_t http, / I - HTTP connection to server */
	90	const char method,/ I - Request method (GET, POST, PUT) */
	91	const char *resource)
	92	/* I - Resource path */
	93	{
	94	const char password; / Password string */
	95	char prompt[1024], /* Prompt for user */
	96	realm[HTTP_MAX_VALUE], /* realm="xyz" string */
	97	nonce[HTTP_MAX_VALUE], /* nonce="xyz" string */
f7deaa1a	98	encode[2048]; /* Encoded username:password */
f7deaa1a	99	int localauth; /* Local authentication result */
b86bc4cf	100	_cups_globals_t cg; / Global data */
ef416fc2	101
	102
	103	DEBUG_printf(("cupsDoAuthentication(http=%p, method=\"%s\", resource=\"%s\")\n",
	104	http, method, resource));
	105	DEBUG_printf(("cupsDoAuthentication: digest_tries=%d, userpass=\"%s\"\n",
	106	http->digest_tries, http->userpass));
07725fee	107	DEBUG_printf(("cupsDoAuthentication: WWW-Authenticate=\"%s\"\n",
07725fee	108	httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE)));
ef416fc2	109
	110	/*
	111	* Clear the current authentication string...
	112	*/
	113
f7deaa1a	114	http->_authstring[0] = '\0';
	115
	116	if (http->authstring && http->authstring != http->_authstring)
	117	free(http->authstring);
	118
	119	http->authstring = http->_authstring;
ef416fc2	120
	121	/*
	122	* See if we can do local authentication...
	123	*/
	124
f7deaa1a	125	if (http->digest_tries < 3)
ef416fc2	126	{
f7deaa1a	127	if ((localauth = cups_local_auth(http)) == 0)
	128	{
	129	DEBUG_printf(("cupsDoAuthentication: authstring=\"%s\"\n",
	130	http->authstring));
	131
	132	if (http->status == HTTP_UNAUTHORIZED)
	133	http->digest_tries ++;
	134
	135	return (0);
	136	}
	137	else if (localauth == -1)
	138	return (-1); /* Error or canceled */
ef416fc2	139	}
	140
	141	/*
	142	* Nope, see if we should retry the current username:password...
	143	*/
	144
f7deaa1a	145	if ((http->digest_tries > 1 \|\| !http->userpass[0]) &&
f7deaa1a	146	strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9))
ef416fc2	147	{
	148	/*
	149	* Nope - get a new password from the user...
	150	*/
	151
b86bc4cf	152	cg = _cupsGlobals();
	153
	154	if (!cg->lang_default)
	155	cg->lang_default = cupsLangDefault();
	156
	157	snprintf(prompt, sizeof(prompt),
	158	_cupsLangString(cg->lang_default, _("Password for %s on %s? ")),
	159	cupsUser(),
	160	http->hostname[0] == '/' ? "localhost" : http->hostname);
ef416fc2	161
	162	http->digest_tries = strncasecmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE],
	163	"Digest", 5) != 0;
	164	http->userpass[0] = '\0';
	165
	166	if ((password = cupsGetPassword(prompt)) == NULL)
	167	return (-1);
	168
	169	if (!password[0])
	170	return (-1);
	171
	172	snprintf(http->userpass, sizeof(http->userpass), "%s:%s", cupsUser(),
	173	password);
	174	}
	175	else if (http->status == HTTP_UNAUTHORIZED)
	176	http->digest_tries ++;
	177
	178	/*
	179	* Got a password; encode it for the server...
	180	*/
	181
f7deaa1a	182	if (!strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9))
	183	{
	184	#ifdef HAVE_GSSAPI
	185	/*
	186	* Kerberos authentication...
	187	*/
	188
	189	OM_uint32 minor_status, /* Minor status code */
	190	major_status; /* Major status code */
	191	gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER,
	192	/* Output token */
	193	input_token = GSS_C_EMPTY_BUFFER;
	194	/* Input token */
	195	char *gss_service_name;
	196	/* GSS service name */
	197	const char *authorization;
	198	/* Pointer into Authorization string */
	199
	200
	201	if (http->gssname == GSS_C_NO_NAME)
	202	{
	203	if ((gss_service_name = getenv("CUPS_GSSSERVICENAME")) == NULL)
	204	gss_service_name = CUPS_DEFAULT_GSSSERVICENAME;
	205	else
	206	DEBUG_puts("cupsDoAuthentication: GSS service name set via environment");
	207
	208	http->gssname = cups_get_gss_creds(http, gss_service_name);
	209	}
	210
	211	/*
	212	* Find the start of the Kerberos input token...
	213	*/
	214
	215	authorization = httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE);
	216
	217	authorization += 9;
	218	while (authorization && isspace(authorization & 255))
	219	authorization ++;
	220
	221	if (*authorization)
	222	{
	223	/*
	224	* For SPNEGO, this is where we'll feed the server's authorization data
	225	* back into gss via input_token...
	226	*/
	227	}
	228	else
	229	{
	230	if (http->gssctx != GSS_C_NO_CONTEXT)
	231	{
	232	major_status = gss_delete_sec_context(&minor_status, &http->gssctx,
	233	GSS_C_NO_BUFFER);
	234	http->gssctx = GSS_C_NO_CONTEXT;
	235	}
	236	}
	237
	238	major_status = gss_init_sec_context(&minor_status, GSS_C_NO_CREDENTIAL,
	239	&http->gssctx,
	240	http->gssname, http->gssmech,
	241	GSS_C_MUTUAL_FLAG, GSS_C_INDEFINITE,
	242	GSS_C_NO_CHANNEL_BINDINGS,
	243	&input_token, &http->gssmech,
	244	&output_token, NULL, NULL);
	245
246	if (input_token.value)
247	free(input_token.value);
248
249	if (GSS_ERROR(major_status))
250	{
251	# ifdef DEBUG
252	DEBUG_gss_printf(major_status, minor_status,
253	"Unable to initialise security context");
254	# endif /* DEBUG */
255	return (-1);
256	}
257
258	# ifdef DEBUG
259	if (major_status == GSS_S_CONTINUE_NEEDED)
260	DEBUG_gss_printf(major_status, minor_status, "Continuation needed!");
261	# endif /* DEBUG */
262
263	if (output_token.length)
264	{
265	httpEncode64_2(encode, sizeof(encode), output_token.value,
266	output_token.length);
267
268	http->authstring = malloc(strlen(encode) + 11);
269	sprintf(http->authstring, "Negotiate %s", encode); /* Safe because allocated */
270
271	major_status = gss_release_buffer(&minor_status, &output_token);
272	}
273
274	/*
275	* Copy back what we can to _authstring for backwards compatibility...
276	*/
277
278	strlcpy(http->_authstring, http->authstring, sizeof(http->_authstring));
279	#endif /* HAVE_GSSAPI */
280	}
281	else if (strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Digest", 6))
ef416fc2	282	{
	283	/*
	284	* Basic authentication...
	285	*/
	286
	287	httpEncode64_2(encode, sizeof(encode), http->userpass,
b86bc4cf	288	(int)strlen(http->userpass));
f7deaa1a	289	snprintf(http->_authstring, sizeof(http->_authstring), "Basic %s", encode);
ef416fc2	290	}
	291	else
	292	{
	293	/*
	294	* Digest authentication...
	295	*/
	296
	297	httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "realm", realm);
	298	httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "nonce", nonce);
	299
	300	httpMD5(cupsUser(), realm, strchr(http->userpass, ':') + 1, encode);
	301	httpMD5Final(nonce, method, resource, encode);
f7deaa1a	302	snprintf(http->_authstring, sizeof(http->_authstring),
ef416fc2	303	"Digest username=\"%s\", realm=\"%s\", nonce=\"%s\", "
	304	"uri=\"%s\", response=\"%s\"", cupsUser(), realm, nonce,
	305	resource, encode);
	306	}
	307
	308	DEBUG_printf(("cupsDoAuthentication: authstring=\"%s\"\n", http->authstring));
	309
	310	return (0);
	311	}
	312
	313
f7deaa1a	314	#ifdef HAVE_GSSAPI
	315	# ifdef DEBUG
	316	/*
	317	* 'DEBUG_gss_printf()' - Show debug error messages from GSSAPI...
	318	*/
	319
	320	static void
	321	DEBUG_gss_printf(OM_uint32 major_status,/* I - Major status code */
	322	OM_uint32 minor_status,/* I - Minor status code */
	323	const char message) / I - Prefix for error message */
	324	{
	325	OM_uint32 err_major_status, /* Major status code for display */
	326	err_minor_status; /* Minor status code for display */
	327	OM_uint32 msg_ctx; /* Message context */
	328	gss_buffer_desc major_status_string = GSS_C_EMPTY_BUFFER,
	329	/* Major status message */
	330	minor_status_string = GSS_C_EMPTY_BUFFER;
	331	/* Minor status message */
	332
	333
	334	msg_ctx = 0;
	335	err_major_status = gss_display_status(&err_minor_status,
	336	major_status,
	337	GSS_C_GSS_CODE,
	338	GSS_C_NO_OID,
	339	&msg_ctx,
	340	&major_status_string);
	341
	342	if (!GSS_ERROR(err_major_status))
	343	err_major_status = gss_display_status(&err_minor_status,
	344	minor_status,
	345	GSS_C_MECH_CODE,
	346	GSS_C_NULL_OID,
	347	&msg_ctx,
	348	&minor_status_string);
	349
	350	printf("%s: %s, %s\n", message, (char *)major_status_string.value,
	351	(char *)minor_status_string.value);
	352
	353	gss_release_buffer(&err_minor_status, &major_status_string);
	354	gss_release_buffer(&err_minor_status, &minor_status_string);
	355	}
	356	# endif /* DEBUG */
	357
	358
	359	/*
	360	* 'cups_get_gss_creds()' - Get CUPS service credentials for authentication.
	361	*/
	362
	363	static gss_name_t /* O - Server name */
	364	cups_get_gss_creds(
	365	http_t http, / I - Connection to server */
	366	const char service_name) / I - Service name */
	367	{
	368	gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
	369	/* Service token */
	370	OM_uint32 major_status, /* Major status code */
	371	minor_status; /* Minor status code */
	372	gss_name_t server_name; /* Server name */
	373	char buf[1024], /* Name buffer */
	374	fqdn[HTTP_MAX_URI]; /* Server name buffer */
	375
	376
	377	/*
378	* Get a server name we can use for authentication purposes...
379	*/
380
381	snprintf(buf, sizeof(buf), "%s@%s", service_name,
382	httpGetHostname(http, fqdn, sizeof(fqdn)));
383
384	token.value = buf;
385	token.length = strlen(buf);
386	server_name = GSS_C_NO_NAME;
387	major_status = gss_import_name(&minor_status, &token,
388	GSS_C_NT_HOSTBASED_SERVICE,
389	&server_name);
390
391	if (GSS_ERROR(major_status))
392	{
393	# ifdef DEBUG
394	DEBUG_gss_printf(major_status, minor_status, "gss_import_name() failed");
395	# endif /* DEBUG */
396
397	return (NULL);
398	}
399
400	return (server_name);
401	}
402	#endif /* HAVE_GSSAPI */
403
404
ef416fc2	405	/*
	406	* 'cups_local_auth()' - Get the local authorization certificate if
	407	* available/applicable...
	408	*/
	409
f7deaa1a	410	static int /* O - 0 if available */
	411	/* 1 if not available */
	412	/* -1 error */
ef416fc2	413	cups_local_auth(http_t http) / I - HTTP connection to server */
	414	{
	415	#if defined(WIN32) \|\| defined(__EMX__)
	416	/*
	417	* Currently WIN32 and OS-2 do not support the CUPS server...
	418	*/
	419
	420	return (-1);
	421	#else
f7deaa1a	422	int pid; /* Current process ID */
	423	FILE fp; / Certificate file */
	424	char filename[1024], /* Certificate filename */
	425	certificate[33];/* Certificate string */
ef416fc2	426	_cups_globals_t cg = _cupsGlobals(); / Global data */
f7deaa1a	427	#if defined(HAVE_AUTHORIZATION_H)
	428	OSStatus status; /* Status */
	429	AuthorizationItem auth_right; /* Authorization right */
	430	AuthorizationRights auth_rights; /* Authorization rights */
	431	AuthorizationFlags auth_flags; /* Authorization flags */
	432	AuthorizationExternalForm auth_extrn; /* Authorization ref external */
	433	char auth_key[1024]; /* Buffer */
	434	char buffer[1024]; /* Buffer */
	435	#endif /* HAVE_AUTHORIZATION_H */
ef416fc2	436
	437
	438	DEBUG_printf(("cups_local_auth(http=%p) hostaddr=%s, hostname=\"%s\"\n",
	439	http, httpAddrString(http->hostaddr, filename, sizeof(filename)), http->hostname));
	440
	441	/*
	442	* See if we are accessing localhost...
	443	*/
	444
	445	if (!httpAddrLocalhost(http->hostaddr) &&
	446	strcasecmp(http->hostname, "localhost") != 0)
	447	{
	448	DEBUG_puts("cups_local_auth: Not a local connection!");
	449	return (-1);
	450	}
	451
f7deaa1a	452	#if defined(HAVE_AUTHORIZATION_H)
	453	/*
	454	* Delete any previous authorization reference...
	455	*/
	456
	457	if (cg->auth_ref)
	458	{
	459	AuthorizationFree(cg->auth_ref, kAuthorizationFlagDefaults);
	460	cg->auth_ref = NULL;
	461	}
	462
	463	if (httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
	464	auth_key, sizeof(auth_key)))
	465	{
	466	status = AuthorizationCreate(NULL, kAuthorizationEmptyEnvironment,
	467	kAuthorizationFlagDefaults, &cg->auth_ref);
	468	if (status != errAuthorizationSuccess)
	469	{
	470	DEBUG_printf(("cups_local_auth: AuthorizationCreate() returned %d (%s)\n",
	471	(int)status, cssmErrorString(status)));
	472	return (-1);
	473	}
	474
	475	auth_right.name = auth_key;
	476	auth_right.valueLength = 0;
	477	auth_right.value = NULL;
	478	auth_right.flags = 0;
	479
	480	auth_rights.count = 1;
	481	auth_rights.items = &auth_right;
	482
	483	auth_flags = kAuthorizationFlagDefaults \|
	484	kAuthorizationFlagPreAuthorize \|
	485	kAuthorizationFlagInteractionAllowed \|
	486	kAuthorizationFlagExtendRights;
	487
	488	status = AuthorizationCopyRights(cg->auth_ref, &auth_rights,
	489	kAuthorizationEmptyEnvironment,
	490	auth_flags, NULL);
	491	if (status == errAuthorizationSuccess)
	492	status = AuthorizationMakeExternalForm(cg->auth_ref, &auth_extrn);
	493
	494	if (status == errAuthorizationSuccess)
	495	{
	496	/*
	497	* Set the authorization string and return...
	498	*/
	499
	500	httpEncode64_2(buffer, sizeof(buffer), (void *)&auth_extrn,
	501	sizeof(auth_extrn));
	502
	503	http->authstring = malloc(strlen(buffer) + 9);
	504	sprintf(http->authstring, "AuthRef %s", buffer);
	505
	506	/* Copy back to _authstring for backwards compatibility */
	507	strlcpy(http->_authstring, http->authstring, sizeof(http->_authstring));
	508
	509	DEBUG_printf(("cups_local_auth: Returning authstring = \"%s\"\n",
	510	http->authstring));
	511	return (0);
	512	}
	513	else if (status == errAuthorizationCanceled)
	514	return (-1);
	515
516	DEBUG_printf(("cups_local_auth: AuthorizationCopyRights() returned %d (%s)\n",
517	(int)status, cssmErrorString(status)));
518
519	/*
520	* Fall through to try certificates...
521	*/
522	}
523	#endif /* HAVE_AUTHORIZATION_H */
524
ef416fc2	525	/*
	526	* Try opening a certificate file for this PID. If that fails,
	527	* try the root certificate...
	528	*/
	529
	530	pid = getpid();
	531	snprintf(filename, sizeof(filename), "%s/certs/%d", cg->cups_statedir, pid);
	532	if ((fp = fopen(filename, "r")) == NULL && pid > 0)
	533	{
	534	DEBUG_printf(("cups_local_auth: Unable to open file %s: %s\n",
	535	filename, strerror(errno)));
	536
	537	snprintf(filename, sizeof(filename), "%s/certs/0", cg->cups_statedir);
	538	fp = fopen(filename, "r");
	539	}
	540
f7deaa1a	541	if (fp)
ef416fc2	542	{
f7deaa1a	543	/*
	544	* Read the certificate from the file...
	545	*/
ef416fc2	546
f7deaa1a	547	fgets(certificate, sizeof(certificate), fp);
f7deaa1a	548	fclose(fp);
ef416fc2	549
f7deaa1a	550	/*
	551	* Set the authorization string and return...
	552	*/
ef416fc2	553
f7deaa1a	554	http->authstring = malloc(strlen(certificate) + 10);
f7deaa1a	555	sprintf(http->authstring, "Local %s", certificate);
ef416fc2	556
f7deaa1a	557	/* Copy back to _authstring for backwards compatibility */
f7deaa1a	558	strlcpy(http->_authstring, http->authstring, sizeof(http->_authstring));
ef416fc2	559
f7deaa1a	560	DEBUG_printf(("cups_local_auth: Returning authstring = \"%s\"\n",
f7deaa1a	561	http->authstring));
ef416fc2	562
f7deaa1a	563	return (0);
	564	}
	565
	566	return (1);
ef416fc2	567	#endif /* WIN32 \|\| __EMX__ */
	568	}
	569
	570
	571	/*
f7deaa1a	572	* End of "$Id: auth.c 6253 2007-02-10 18:48:40Z mike $".
ef416fc2	573	*/