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

/*
 * "$Id: auth.c 6499 2007-04-30 21:44:43Z 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 */


#  ifdef __APPLE__
   /*
    * If the weak-linked GSSAPI/Kerberos library is not present, don't try
    * to use it...
    */

    if (gss_init_sec_context == NULL)
    {
      DEBUG_puts("cupsDoAuthentication: Weak-linked GSSAPI/Kerberos framework "
                 "is not present");
      return (-1);
    }
#  endif /* __APPLE__ */

    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 (http->auth_ref)
  {
    AuthorizationFree(http->auth_ref, kAuthorizationFlagDefaults);
    http->auth_ref = NULL;
  }

  if (httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey", 
		       auth_key, sizeof(auth_key)))
  {
    status = AuthorizationCreate(NULL, kAuthorizationEmptyEnvironment, 
				 kAuthorizationFlagDefaults, &http->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(http->auth_ref, &auth_rights, 
				     kAuthorizationEmptyEnvironment, 
				     auth_flags, NULL);
    if (status == errAuthorizationSuccess)
      status = AuthorizationMakeExternalForm(http->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 6499 2007-04-30 21:44:43Z mike $".
 */
Commit	Line	Data
ef416fc2	1	/*
b94498cf	2	* "$Id: auth.c 6499 2007-04-30 21:44:43Z 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
f42414bf	201	# ifdef __APPLE__
	202	/*
	203	* If the weak-linked GSSAPI/Kerberos library is not present, don't try
	204	* to use it...
	205	*/
	206
	207	if (gss_init_sec_context == NULL)
	208	{
	209	DEBUG_puts("cupsDoAuthentication: Weak-linked GSSAPI/Kerberos framework "
	210	"is not present");
	211	return (-1);
	212	}
	213	# endif /* __APPLE__ */
	214
f7deaa1a	215	if (http->gssname == GSS_C_NO_NAME)
	216	{
	217	if ((gss_service_name = getenv("CUPS_GSSSERVICENAME")) == NULL)
	218	gss_service_name = CUPS_DEFAULT_GSSSERVICENAME;
	219	else
	220	DEBUG_puts("cupsDoAuthentication: GSS service name set via environment");
	221
	222	http->gssname = cups_get_gss_creds(http, gss_service_name);
	223	}
	224
	225	/*
	226	* Find the start of the Kerberos input token...
	227	*/
	228
	229	authorization = httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE);
	230
	231	authorization += 9;
	232	while (authorization && isspace(authorization & 255))
	233	authorization ++;
	234
	235	if (*authorization)
	236	{
	237	/*
	238	* For SPNEGO, this is where we'll feed the server's authorization data
	239	* back into gss via input_token...
	240	*/
	241	}
	242	else
	243	{
	244	if (http->gssctx != GSS_C_NO_CONTEXT)
	245	{
	246	major_status = gss_delete_sec_context(&minor_status, &http->gssctx,
	247	GSS_C_NO_BUFFER);
	248	http->gssctx = GSS_C_NO_CONTEXT;
	249	}
	250	}
	251
	252	major_status = gss_init_sec_context(&minor_status, GSS_C_NO_CREDENTIAL,
	253	&http->gssctx,
	254	http->gssname, http->gssmech,
	255	GSS_C_MUTUAL_FLAG, GSS_C_INDEFINITE,
	256	GSS_C_NO_CHANNEL_BINDINGS,
	257	&input_token, &http->gssmech,
	258	&output_token, NULL, NULL);
	259
	260	if (input_token.value)
	261	free(input_token.value);
	262
	263	if (GSS_ERROR(major_status))
	264	{
	265	# ifdef DEBUG
	266	DEBUG_gss_printf(major_status, minor_status,
	267	"Unable to initialise security context");
	268	# endif /* DEBUG */
	269	return (-1);
	270	}
	271
	272	# ifdef DEBUG
	273	if (major_status == GSS_S_CONTINUE_NEEDED)
	274	DEBUG_gss_printf(major_status, minor_status, "Continuation needed!");
	275	# endif /* DEBUG */
	276
	277	if (output_token.length)
	278	{
279	httpEncode64_2(encode, sizeof(encode), output_token.value,
280	output_token.length);
281
282	http->authstring = malloc(strlen(encode) + 11);
283	sprintf(http->authstring, "Negotiate %s", encode); /* Safe because allocated */
284
285	major_status = gss_release_buffer(&minor_status, &output_token);
286	}
287
288	/*
289	* Copy back what we can to _authstring for backwards compatibility...
290	*/
291
292	strlcpy(http->_authstring, http->authstring, sizeof(http->_authstring));
293	#endif /* HAVE_GSSAPI */
294	}
295	else if (strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Digest", 6))
ef416fc2	296	{
	297	/*
	298	* Basic authentication...
	299	*/
	300
	301	httpEncode64_2(encode, sizeof(encode), http->userpass,
b86bc4cf	302	(int)strlen(http->userpass));
f7deaa1a	303	snprintf(http->_authstring, sizeof(http->_authstring), "Basic %s", encode);
ef416fc2	304	}
	305	else
	306	{
	307	/*
	308	* Digest authentication...
	309	*/
	310
	311	httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "realm", realm);
	312	httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "nonce", nonce);
	313
	314	httpMD5(cupsUser(), realm, strchr(http->userpass, ':') + 1, encode);
	315	httpMD5Final(nonce, method, resource, encode);
f7deaa1a	316	snprintf(http->_authstring, sizeof(http->_authstring),
ef416fc2	317	"Digest username=\"%s\", realm=\"%s\", nonce=\"%s\", "
	318	"uri=\"%s\", response=\"%s\"", cupsUser(), realm, nonce,
	319	resource, encode);
	320	}
	321
	322	DEBUG_printf(("cupsDoAuthentication: authstring=\"%s\"\n", http->authstring));
	323
	324	return (0);
	325	}
	326
	327
f7deaa1a	328	#ifdef HAVE_GSSAPI
	329	# ifdef DEBUG
	330	/*
	331	* 'DEBUG_gss_printf()' - Show debug error messages from GSSAPI...
	332	*/
	333
	334	static void
	335	DEBUG_gss_printf(OM_uint32 major_status,/* I - Major status code */
	336	OM_uint32 minor_status,/* I - Minor status code */
	337	const char message) / I - Prefix for error message */
	338	{
	339	OM_uint32 err_major_status, /* Major status code for display */
	340	err_minor_status; /* Minor status code for display */
	341	OM_uint32 msg_ctx; /* Message context */
	342	gss_buffer_desc major_status_string = GSS_C_EMPTY_BUFFER,
	343	/* Major status message */
	344	minor_status_string = GSS_C_EMPTY_BUFFER;
	345	/* Minor status message */
	346
	347
	348	msg_ctx = 0;
	349	err_major_status = gss_display_status(&err_minor_status,
	350	major_status,
	351	GSS_C_GSS_CODE,
	352	GSS_C_NO_OID,
	353	&msg_ctx,
	354	&major_status_string);
	355
	356	if (!GSS_ERROR(err_major_status))
	357	err_major_status = gss_display_status(&err_minor_status,
	358	minor_status,
	359	GSS_C_MECH_CODE,
	360	GSS_C_NULL_OID,
	361	&msg_ctx,
	362	&minor_status_string);
	363
	364	printf("%s: %s, %s\n", message, (char *)major_status_string.value,
	365	(char *)minor_status_string.value);
	366
	367	gss_release_buffer(&err_minor_status, &major_status_string);
	368	gss_release_buffer(&err_minor_status, &minor_status_string);
	369	}
	370	# endif /* DEBUG */
	371
	372
	373	/*
	374	* 'cups_get_gss_creds()' - Get CUPS service credentials for authentication.
	375	*/
	376
	377	static gss_name_t /* O - Server name */
	378	cups_get_gss_creds(
	379	http_t http, / I - Connection to server */
	380	const char service_name) / I - Service name */
	381	{
	382	gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
	383	/* Service token */
	384	OM_uint32 major_status, /* Major status code */
	385	minor_status; /* Minor status code */
	386	gss_name_t server_name; /* Server name */
	387	char buf[1024], /* Name buffer */
	388	fqdn[HTTP_MAX_URI]; /* Server name buffer */
	389
	390
	391	/*
392	* Get a server name we can use for authentication purposes...
393	*/
394
395	snprintf(buf, sizeof(buf), "%s@%s", service_name,
396	httpGetHostname(http, fqdn, sizeof(fqdn)));
397
398	token.value = buf;
399	token.length = strlen(buf);
400	server_name = GSS_C_NO_NAME;
401	major_status = gss_import_name(&minor_status, &token,
402	GSS_C_NT_HOSTBASED_SERVICE,
403	&server_name);
404
405	if (GSS_ERROR(major_status))
406	{
407	# ifdef DEBUG
408	DEBUG_gss_printf(major_status, minor_status, "gss_import_name() failed");
409	# endif /* DEBUG */
410
411	return (NULL);
412	}
413
414	return (server_name);
415	}
416	#endif /* HAVE_GSSAPI */
417
418
ef416fc2	419	/*
	420	* 'cups_local_auth()' - Get the local authorization certificate if
	421	* available/applicable...
	422	*/
	423
f7deaa1a	424	static int /* O - 0 if available */
	425	/* 1 if not available */
	426	/* -1 error */
ef416fc2	427	cups_local_auth(http_t http) / I - HTTP connection to server */
	428	{
	429	#if defined(WIN32) \|\| defined(__EMX__)
	430	/*
	431	* Currently WIN32 and OS-2 do not support the CUPS server...
	432	*/
	433
	434	return (-1);
	435	#else
f7deaa1a	436	int pid; /* Current process ID */
	437	FILE fp; / Certificate file */
	438	char filename[1024], /* Certificate filename */
	439	certificate[33];/* Certificate string */
ef416fc2	440	_cups_globals_t cg = _cupsGlobals(); / Global data */
f7deaa1a	441	#if defined(HAVE_AUTHORIZATION_H)
	442	OSStatus status; /* Status */
	443	AuthorizationItem auth_right; /* Authorization right */
	444	AuthorizationRights auth_rights; /* Authorization rights */
	445	AuthorizationFlags auth_flags; /* Authorization flags */
	446	AuthorizationExternalForm auth_extrn; /* Authorization ref external */
	447	char auth_key[1024]; /* Buffer */
	448	char buffer[1024]; /* Buffer */
	449	#endif /* HAVE_AUTHORIZATION_H */
ef416fc2	450
	451
	452	DEBUG_printf(("cups_local_auth(http=%p) hostaddr=%s, hostname=\"%s\"\n",
	453	http, httpAddrString(http->hostaddr, filename, sizeof(filename)), http->hostname));
	454
	455	/*
	456	* See if we are accessing localhost...
	457	*/
	458
	459	if (!httpAddrLocalhost(http->hostaddr) &&
	460	strcasecmp(http->hostname, "localhost") != 0)
	461	{
	462	DEBUG_puts("cups_local_auth: Not a local connection!");
	463	return (-1);
	464	}
	465
f7deaa1a	466	#if defined(HAVE_AUTHORIZATION_H)
	467	/*
	468	* Delete any previous authorization reference...
	469	*/
	470
b94498cf	471	if (http->auth_ref)
f7deaa1a	472	{
b94498cf	473	AuthorizationFree(http->auth_ref, kAuthorizationFlagDefaults);
b94498cf	474	http->auth_ref = NULL;
f7deaa1a	475	}
	476
	477	if (httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
	478	auth_key, sizeof(auth_key)))
	479	{
	480	status = AuthorizationCreate(NULL, kAuthorizationEmptyEnvironment,
b94498cf	481	kAuthorizationFlagDefaults, &http->auth_ref);
f7deaa1a	482	if (status != errAuthorizationSuccess)
	483	{
	484	DEBUG_printf(("cups_local_auth: AuthorizationCreate() returned %d (%s)\n",
	485	(int)status, cssmErrorString(status)));
	486	return (-1);
	487	}
	488
	489	auth_right.name = auth_key;
	490	auth_right.valueLength = 0;
	491	auth_right.value = NULL;
	492	auth_right.flags = 0;
	493
	494	auth_rights.count = 1;
	495	auth_rights.items = &auth_right;
	496
	497	auth_flags = kAuthorizationFlagDefaults \|
	498	kAuthorizationFlagPreAuthorize \|
	499	kAuthorizationFlagInteractionAllowed \|
	500	kAuthorizationFlagExtendRights;
	501
b94498cf	502	status = AuthorizationCopyRights(http->auth_ref, &auth_rights,
f7deaa1a	503	kAuthorizationEmptyEnvironment,
	504	auth_flags, NULL);
	505	if (status == errAuthorizationSuccess)
b94498cf	506	status = AuthorizationMakeExternalForm(http->auth_ref, &auth_extrn);
f7deaa1a	507
	508	if (status == errAuthorizationSuccess)
	509	{
	510	/*
	511	* Set the authorization string and return...
	512	*/
	513
	514	httpEncode64_2(buffer, sizeof(buffer), (void *)&auth_extrn,
	515	sizeof(auth_extrn));
	516
	517	http->authstring = malloc(strlen(buffer) + 9);
	518	sprintf(http->authstring, "AuthRef %s", buffer);
	519
	520	/* Copy back to _authstring for backwards compatibility */
	521	strlcpy(http->_authstring, http->authstring, sizeof(http->_authstring));
	522
	523	DEBUG_printf(("cups_local_auth: Returning authstring = \"%s\"\n",
	524	http->authstring));
	525	return (0);
	526	}
	527	else if (status == errAuthorizationCanceled)
	528	return (-1);
	529
	530	DEBUG_printf(("cups_local_auth: AuthorizationCopyRights() returned %d (%s)\n",
	531	(int)status, cssmErrorString(status)));
	532
	533	/*
	534	* Fall through to try certificates...
	535	*/
	536	}
	537	#endif /* HAVE_AUTHORIZATION_H */
	538
ef416fc2	539	/*
	540	* Try opening a certificate file for this PID. If that fails,
	541	* try the root certificate...
	542	*/
	543
	544	pid = getpid();
	545	snprintf(filename, sizeof(filename), "%s/certs/%d", cg->cups_statedir, pid);
	546	if ((fp = fopen(filename, "r")) == NULL && pid > 0)
	547	{
	548	DEBUG_printf(("cups_local_auth: Unable to open file %s: %s\n",
	549	filename, strerror(errno)));
	550
	551	snprintf(filename, sizeof(filename), "%s/certs/0", cg->cups_statedir);
	552	fp = fopen(filename, "r");
	553	}
	554
f7deaa1a	555	if (fp)
ef416fc2	556	{
f7deaa1a	557	/*
	558	* Read the certificate from the file...
	559	*/
ef416fc2	560
f7deaa1a	561	fgets(certificate, sizeof(certificate), fp);
f7deaa1a	562	fclose(fp);
ef416fc2	563
f7deaa1a	564	/*
	565	* Set the authorization string and return...
	566	*/
ef416fc2	567
f7deaa1a	568	http->authstring = malloc(strlen(certificate) + 10);
f7deaa1a	569	sprintf(http->authstring, "Local %s", certificate);
ef416fc2	570
f7deaa1a	571	/* Copy back to _authstring for backwards compatibility */
f7deaa1a	572	strlcpy(http->_authstring, http->authstring, sizeof(http->_authstring));
ef416fc2	573
f7deaa1a	574	DEBUG_printf(("cups_local_auth: Returning authstring = \"%s\"\n",
f7deaa1a	575	http->authstring));
ef416fc2	576
f7deaa1a	577	return (0);
	578	}
	579
	580	return (1);
ef416fc2	581	#endif /* WIN32 \|\| __EMX__ */
	582	}
	583
	584
	585	/*
b94498cf	586	* End of "$Id: auth.c 6499 2007-04-30 21:44:43Z mike $".
ef416fc2	587	*/