1 /*
2 * Authentication functions for CUPS.
3 *
4 * Copyright 2007-2016 by Apple Inc.
5 * Copyright 1997-2007 by Easy Software Products.
6 *
7 * This file contains Kerberos support code, copyright 2006 by
8 * Jelmer Vernooij.
9 *
10 * These coded instructions, statements, and computer programs are the
11 * property of Apple Inc. and are protected by Federal copyright
12 * law. Distribution and use rights are outlined in the file "LICENSE.txt"
13 * which should have been included with this file. If this file is
14 * missing or damaged, see the license at "http://www.cups.org/".
15 *
16 * This file is subject to the Apple OS-Developed Software exception.
17 */
18
19 /*
20 * Include necessary headers...
21 */
22
23 #include "cups-private.h"
24 #include <fcntl.h>
25 #include <sys/stat.h>
26 #if defined(WIN32) || defined(__EMX__)
27 # include <io.h>
28 #else
29 # include <unistd.h>
30 #endif /* WIN32 || __EMX__ */
31
32 #if HAVE_AUTHORIZATION_H
33 # include <Security/Authorization.h>
34 # ifdef HAVE_SECBASEPRIV_H
35 # include <Security/SecBasePriv.h>
36 # else
37 extern const char *cssmErrorString(int error);
38 # endif /* HAVE_SECBASEPRIV_H */
39 #endif /* HAVE_AUTHORIZATION_H */
40
41 #if defined(SO_PEERCRED) && defined(AF_LOCAL)
42 # include <pwd.h>
43 #endif /* SO_PEERCRED && AF_LOCAL */
44
45
46 /*
47 * Local functions...
48 */
49
50 #ifdef HAVE_GSSAPI
51 # ifdef HAVE_GSS_ACQUIRE_CRED_EX_F
52 # ifdef HAVE_GSS_GSSAPI_SPI_H
53 # include <GSS/gssapi_spi.h>
54 # else
55 # define GSS_AUTH_IDENTITY_TYPE_1 1
56 # define gss_acquire_cred_ex_f __ApplePrivate_gss_acquire_cred_ex_f
57 typedef struct gss_auth_identity /* @private@ */
58 {
59 uint32_t type;
60 uint32_t flags;
61 char *username;
62 char *realm;
63 char *password;
64 gss_buffer_t *credentialsRef;
65 } gss_auth_identity_desc;
66 extern OM_uint32 gss_acquire_cred_ex_f(gss_status_id_t, const gss_name_t,
67 OM_uint32, OM_uint32, const gss_OID,
68 gss_cred_usage_t, gss_auth_identity_t,
69 void *, void (*)(void *, OM_uint32,
70 gss_status_id_t,
71 gss_cred_id_t,
72 gss_OID_set,
73 OM_uint32));
74 # endif /* HAVE_GSS_GSSAPI_SPI_H */
75 # include <dispatch/dispatch.h>
76 typedef struct _cups_gss_acquire_s /* Acquire callback data */
77 {
78 dispatch_semaphore_t sem; /* Synchronization semaphore */
79 OM_uint32 major; /* Returned status code */
80 gss_cred_id_t creds; /* Returned credentials */
81 } _cups_gss_acquire_t;
82
83 static void cups_gss_acquire(void *ctx, OM_uint32 major,
84 gss_status_id_t status,
85 gss_cred_id_t creds, gss_OID_set oids,
86 OM_uint32 time_rec);
87 # endif /* HAVE_GSS_ACQUIRE_CRED_EX_F */
88 static gss_name_t cups_gss_getname(http_t *http, const char *service_name);
89 # ifdef DEBUG
90 static void cups_gss_printf(OM_uint32 major_status, OM_uint32 minor_status,
91 const char *message);
92 # else
93 # define cups_gss_printf(major, minor, message)
94 # endif /* DEBUG */
95 #endif /* HAVE_GSSAPI */
96 static int cups_local_auth(http_t *http);
97
98
99 /*
100 * 'cupsDoAuthentication()' - Authenticate a request.
101 *
102 * This function should be called in response to a @code HTTP_STATUS_UNAUTHORIZED@
103 * status, prior to resubmitting your request.
104 *
105 * @since CUPS 1.1.20/macOS 10.4@
106 */
107
108 int /* O - 0 on success, -1 on error */
cupsDoAuthentication(http_t * http,const char * method,const char * resource)109 cupsDoAuthentication(
110 http_t *http, /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
111 const char *method, /* I - Request method ("GET", "POST", "PUT") */
112 const char *resource) /* I - Resource path */
113 {
114 const char *password, /* Password string */
115 *www_auth; /* WWW-Authenticate header */
116 char prompt[1024], /* Prompt for user */
117 realm[HTTP_MAX_VALUE], /* realm="xyz" string */
118 nonce[HTTP_MAX_VALUE]; /* nonce="xyz" string */
119 int localauth; /* Local authentication result */
120 _cups_globals_t *cg; /* Global data */
121
122
123 DEBUG_printf(("cupsDoAuthentication(http=%p, method=\"%s\", resource=\"%s\")", (void *)http, method, resource));
124
125 if (!http)
126 http = _cupsConnect();
127
128 if (!http || !method || !resource)
129 return (-1);
130
131 DEBUG_printf(("2cupsDoAuthentication: digest_tries=%d, userpass=\"%s\"",
132 http->digest_tries, http->userpass));
133 DEBUG_printf(("2cupsDoAuthentication: WWW-Authenticate=\"%s\"",
134 httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE)));
135
136 /*
137 * Clear the current authentication string...
138 */
139
140 httpSetAuthString(http, NULL, NULL);
141
142 /*
143 * See if we can do local authentication...
144 */
145
146 if (http->digest_tries < 3)
147 {
148 if ((localauth = cups_local_auth(http)) == 0)
149 {
150 DEBUG_printf(("2cupsDoAuthentication: authstring=\"%s\"",
151 http->authstring));
152
153 if (http->status == HTTP_STATUS_UNAUTHORIZED)
154 http->digest_tries ++;
155
156 return (0);
157 }
158 else if (localauth == -1)
159 {
160 http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
161 return (-1); /* Error or canceled */
162 }
163 }
164
165 /*
166 * Nope, see if we should retry the current username:password...
167 */
168
169 www_auth = http->fields[HTTP_FIELD_WWW_AUTHENTICATE];
170
171 if ((http->digest_tries > 1 || !http->userpass[0]) &&
172 (!_cups_strncasecmp(www_auth, "Basic", 5) ||
173 !_cups_strncasecmp(www_auth, "Digest", 6)))
174 {
175 /*
176 * Nope - get a new password from the user...
177 */
178
179 char default_username[HTTP_MAX_VALUE];
180 /* Default username */
181
182 cg = _cupsGlobals();
183
184 if (!cg->lang_default)
185 cg->lang_default = cupsLangDefault();
186
187 if (httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "username",
188 default_username))
189 cupsSetUser(default_username);
190
191 snprintf(prompt, sizeof(prompt),
192 _cupsLangString(cg->lang_default, _("Password for %s on %s? ")),
193 cupsUser(),
194 http->hostname[0] == '/' ? "localhost" : http->hostname);
195
196 http->digest_tries = _cups_strncasecmp(www_auth, "Digest", 6) != 0;
197 http->userpass[0] = '\0';
198
199 if ((password = cupsGetPassword2(prompt, http, method, resource)) == NULL)
200 {
201 http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
202 return (-1);
203 }
204
205 snprintf(http->userpass, sizeof(http->userpass), "%s:%s", cupsUser(),
206 password);
207 }
208 else if (http->status == HTTP_STATUS_UNAUTHORIZED)
209 http->digest_tries ++;
210
211 if (http->status == HTTP_STATUS_UNAUTHORIZED && http->digest_tries >= 3)
212 {
213 DEBUG_printf(("1cupsDoAuthentication: Too many authentication tries (%d)",
214 http->digest_tries));
215
216 http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
217 return (-1);
218 }
219
220 /*
221 * Got a password; encode it for the server...
222 */
223
224 #ifdef HAVE_GSSAPI
225 if (!_cups_strncasecmp(www_auth, "Negotiate", 9))
226 {
227 /*
228 * Kerberos authentication...
229 */
230
231 if (_cupsSetNegotiateAuthString(http, method, resource))
232 {
233 http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
234 return (-1);
235 }
236 }
237 else
238 #endif /* HAVE_GSSAPI */
239 if (!_cups_strncasecmp(www_auth, "Basic", 5))
240 {
241 /*
242 * Basic authentication...
243 */
244
245 char encode[256]; /* Base64 buffer */
246
247
248 httpEncode64_2(encode, sizeof(encode), http->userpass,
249 (int)strlen(http->userpass));
250 httpSetAuthString(http, "Basic", encode);
251 }
252 else if (!_cups_strncasecmp(www_auth, "Digest", 6))
253 {
254 /*
255 * Digest authentication...
256 */
257
258 char encode[33], /* MD5 buffer */
259 digest[1024]; /* Digest auth data */
260
261 httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "realm", realm);
262 httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "nonce", nonce);
263
264 httpMD5(cupsUser(), realm, strchr(http->userpass, ':') + 1, encode);
265 httpMD5Final(nonce, method, resource, encode);
266 snprintf(digest, sizeof(digest),
267 "username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", "
268 "response=\"%s\"", cupsUser(), realm, nonce, resource, encode);
269 httpSetAuthString(http, "Digest", digest);
270 }
271 else
272 {
273 DEBUG_printf(("1cupsDoAuthentication: Unknown auth type: \"%s\"",
274 www_auth));
275 http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
276 return (-1);
277 }
278
279 DEBUG_printf(("1cupsDoAuthentication: authstring=\"%s\"", http->authstring));
280
281 return (0);
282 }
283
284
285 #ifdef HAVE_GSSAPI
286 /*
287 * '_cupsSetNegotiateAuthString()' - Set the Kerberos authentication string.
288 */
289
290 int /* O - 0 on success, -1 on error */
_cupsSetNegotiateAuthString(http_t * http,const char * method,const char * resource)291 _cupsSetNegotiateAuthString(
292 http_t *http, /* I - Connection to server */
293 const char *method, /* I - Request method ("GET", "POST", "PUT") */
294 const char *resource) /* I - Resource path */
295 {
296 OM_uint32 minor_status, /* Minor status code */
297 major_status; /* Major status code */
298 gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
299 /* Output token */
300
301
302 (void)method;
303 (void)resource;
304
305 # ifdef __APPLE__
306 /*
307 * If the weak-linked GSSAPI/Kerberos library is not present, don't try
308 * to use it...
309 */
310
311 if (&gss_init_sec_context == NULL)
312 {
313 DEBUG_puts("1_cupsSetNegotiateAuthString: Weak-linked GSSAPI/Kerberos "
314 "framework is not present");
315 return (-1);
316 }
317 # endif /* __APPLE__ */
318
319 if (http->gssname == GSS_C_NO_NAME)
320 {
321 http->gssname = cups_gss_getname(http, _cupsGSSServiceName());
322 }
323
324 if (http->gssctx != GSS_C_NO_CONTEXT)
325 {
326 gss_delete_sec_context(&minor_status, &http->gssctx, GSS_C_NO_BUFFER);
327 http->gssctx = GSS_C_NO_CONTEXT;
328 }
329
330 major_status = gss_init_sec_context(&minor_status, GSS_C_NO_CREDENTIAL,
331 &http->gssctx,
332 http->gssname, http->gssmech,
333 GSS_C_MUTUAL_FLAG | GSS_C_INTEG_FLAG,
334 GSS_C_INDEFINITE,
335 GSS_C_NO_CHANNEL_BINDINGS,
336 GSS_C_NO_BUFFER, &http->gssmech,
337 &output_token, NULL, NULL);
338
339 #ifdef HAVE_GSS_ACQUIRE_CRED_EX_F
340 if (major_status == GSS_S_NO_CRED)
341 {
342 /*
343 * Ask the user for credentials...
344 */
345
346 char prompt[1024], /* Prompt for user */
347 userbuf[256]; /* Kerberos username */
348 const char *username, /* Username string */
349 *password; /* Password string */
350 _cups_gss_acquire_t data; /* Callback data */
351 gss_auth_identity_desc identity; /* Kerberos user identity */
352 _cups_globals_t *cg = _cupsGlobals();
353 /* Per-thread global data */
354
355 if (!cg->lang_default)
356 cg->lang_default = cupsLangDefault();
357
358 snprintf(prompt, sizeof(prompt),
359 _cupsLangString(cg->lang_default, _("Password for %s on %s? ")),
360 cupsUser(), http->gsshost);
361
362 if ((password = cupsGetPassword2(prompt, http, method, resource)) == NULL)
363 return (-1);
364
365 /*
366 * Try to acquire credentials...
367 */
368
369 username = cupsUser();
370 if (!strchr(username, '@'))
371 {
372 snprintf(userbuf, sizeof(userbuf), "%s@%s", username, http->gsshost);
373 username = userbuf;
374 }
375
376 identity.type = GSS_AUTH_IDENTITY_TYPE_1;
377 identity.flags = 0;
378 identity.username = (char *)username;
379 identity.realm = (char *)"";
380 identity.password = (char *)password;
381 identity.credentialsRef = NULL;
382
383 data.sem = dispatch_semaphore_create(0);
384 data.major = 0;
385 data.creds = NULL;
386
387 if (data.sem)
388 {
389 major_status = gss_acquire_cred_ex_f(NULL, GSS_C_NO_NAME, 0, GSS_C_INDEFINITE, GSS_KRB5_MECHANISM, GSS_C_INITIATE, (gss_auth_identity_t)&identity, &data, cups_gss_acquire);
390
391 if (major_status == GSS_S_COMPLETE)
392 {
393 dispatch_semaphore_wait(data.sem, DISPATCH_TIME_FOREVER);
394 major_status = data.major;
395 }
396
397 dispatch_release(data.sem);
398
399 if (major_status == GSS_S_COMPLETE)
400 {
401 OM_uint32 release_minor; /* Minor status from releasing creds */
402
403 major_status = gss_init_sec_context(&minor_status, data.creds,
404 &http->gssctx,
405 http->gssname, http->gssmech,
406 GSS_C_MUTUAL_FLAG | GSS_C_INTEG_FLAG,
407 GSS_C_INDEFINITE,
408 GSS_C_NO_CHANNEL_BINDINGS,
409 GSS_C_NO_BUFFER, &http->gssmech,
410 &output_token, NULL, NULL);
411 gss_release_cred(&release_minor, &data.creds);
412 }
413 }
414 }
415 #endif /* HAVE_GSS_ACQUIRED_CRED_EX_F */
416
417 if (GSS_ERROR(major_status))
418 {
419 cups_gss_printf(major_status, minor_status,
420 "_cupsSetNegotiateAuthString: Unable to initialize "
421 "security context");
422 return (-1);
423 }
424
425 #ifdef DEBUG
426 else if (major_status == GSS_S_CONTINUE_NEEDED)
427 cups_gss_printf(major_status, minor_status,
428 "_cupsSetNegotiateAuthString: Continuation needed!");
429 #endif /* DEBUG */
430
431 if (output_token.length > 0 && output_token.length <= 65536)
432 {
433 /*
434 * Allocate the authorization string since Windows KDCs can have
435 * arbitrarily large credentials...
436 */
437
438 int authsize = 10 + /* "Negotiate " */
439 (int)output_token.length * 4 / 3 + 1 + 1;
440 /* Base64 + nul */
441
442 httpSetAuthString(http, NULL, NULL);
443
444 if ((http->authstring = malloc((size_t)authsize)) == NULL)
445 {
446 http->authstring = http->_authstring;
447 authsize = sizeof(http->_authstring);
448 }
449
450 strlcpy(http->authstring, "Negotiate ", (size_t)authsize);
451 httpEncode64_2(http->authstring + 10, authsize - 10, output_token.value,
452 (int)output_token.length);
453
454 gss_release_buffer(&minor_status, &output_token);
455 }
456 else
457 {
458 DEBUG_printf(("1_cupsSetNegotiateAuthString: Kerberos credentials too "
459 "large - %d bytes!", (int)output_token.length));
460 gss_release_buffer(&minor_status, &output_token);
461
462 return (-1);
463 }
464
465 return (0);
466 }
467
468
469 # ifdef HAVE_GSS_ACQUIRE_CRED_EX_F
470 /*
471 * 'cups_gss_acquire()' - Kerberos credentials callback.
472 */
473 static void
cups_gss_acquire(void * ctx,OM_uint32 major,gss_status_id_t status,gss_cred_id_t creds,gss_OID_set oids,OM_uint32 time_rec)474 cups_gss_acquire(
475 void *ctx, /* I - Caller context */
476 OM_uint32 major, /* I - Major error code */
477 gss_status_id_t status, /* I - Status (unused) */
478 gss_cred_id_t creds, /* I - Credentials (if any) */
479 gss_OID_set oids, /* I - Mechanism OIDs (unused) */
480 OM_uint32 time_rec) /* I - Timestamp (unused) */
481 {
482 uint32_t min; /* Minor error code */
483 _cups_gss_acquire_t *data; /* Callback data */
484
485
486 (void)status;
487 (void)time_rec;
488
489 data = (_cups_gss_acquire_t *)ctx;
490 data->major = major;
491 data->creds = creds;
492
493 gss_release_oid_set(&min, &oids);
494 dispatch_semaphore_signal(data->sem);
495 }
496 # endif /* HAVE_GSS_ACQUIRE_CRED_EX_F */
497
498
499 /*
500 * 'cups_gss_getname()' - Get CUPS service credentials for authentication.
501 */
502
503 static gss_name_t /* O - Server name */
cups_gss_getname(http_t * http,const char * service_name)504 cups_gss_getname(
505 http_t *http, /* I - Connection to server */
506 const char *service_name) /* I - Service name */
507 {
508 gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
509 /* Service token */
510 OM_uint32 major_status, /* Major status code */
511 minor_status; /* Minor status code */
512 gss_name_t server_name; /* Server name */
513 char buf[1024]; /* Name buffer */
514
515
516 DEBUG_printf(("7cups_gss_getname(http=%p, service_name=\"%s\")", http,
517 service_name));
518
519
520 /*
521 * Get the hostname...
522 */
523
524 if (!http->gsshost[0])
525 {
526 httpGetHostname(http, http->gsshost, sizeof(http->gsshost));
527
528 if (!strcmp(http->gsshost, "localhost"))
529 {
530 if (gethostname(http->gsshost, sizeof(http->gsshost)) < 0)
531 {
532 DEBUG_printf(("1cups_gss_getname: gethostname() failed: %s",
533 strerror(errno)));
534 http->gsshost[0] = '\0';
535 return (NULL);
536 }
537
538 if (!strchr(http->gsshost, '.'))
539 {
540 /*
541 * The hostname is not a FQDN, so look it up...
542 */
543
544 struct hostent *host; /* Host entry to get FQDN */
545
546 if ((host = gethostbyname(http->gsshost)) != NULL && host->h_name)
547 {
548 /*
549 * Use the resolved hostname...
550 */
551
552 strlcpy(http->gsshost, host->h_name, sizeof(http->gsshost));
553 }
554 else
555 {
556 DEBUG_printf(("1cups_gss_getname: gethostbyname(\"%s\") failed.",
557 http->gsshost));
558 http->gsshost[0] = '\0';
559 return (NULL);
560 }
561 }
562 }
563 }
564
565 /*
566 * Get a service name we can use for authentication purposes...
567 */
568
569 snprintf(buf, sizeof(buf), "%s@%s", service_name, http->gsshost);
570
571 DEBUG_printf(("8cups_gss_getname: Looking up \"%s\".", buf));
572
573 token.value = buf;
574 token.length = strlen(buf);
575 server_name = GSS_C_NO_NAME;
576 major_status = gss_import_name(&minor_status, &token,
577 GSS_C_NT_HOSTBASED_SERVICE,
578 &server_name);
579
580 if (GSS_ERROR(major_status))
581 {
582 cups_gss_printf(major_status, minor_status,
583 "cups_gss_getname: gss_import_name() failed");
584 return (NULL);
585 }
586
587 return (server_name);
588 }
589
590
591 # ifdef DEBUG
592 /*
593 * 'cups_gss_printf()' - Show debug error messages from GSSAPI.
594 */
595
596 static void
cups_gss_printf(OM_uint32 major_status,OM_uint32 minor_status,const char * message)597 cups_gss_printf(OM_uint32 major_status,/* I - Major status code */
598 OM_uint32 minor_status,/* I - Minor status code */
599 const char *message) /* I - Prefix for error message */
600 {
601 OM_uint32 err_major_status, /* Major status code for display */
602 err_minor_status; /* Minor status code for display */
603 OM_uint32 msg_ctx; /* Message context */
604 gss_buffer_desc major_status_string = GSS_C_EMPTY_BUFFER,
605 /* Major status message */
606 minor_status_string = GSS_C_EMPTY_BUFFER;
607 /* Minor status message */
608
609
610 msg_ctx = 0;
611 err_major_status = gss_display_status(&err_minor_status,
612 major_status,
613 GSS_C_GSS_CODE,
614 GSS_C_NO_OID,
615 &msg_ctx,
616 &major_status_string);
617
618 if (!GSS_ERROR(err_major_status))
619 gss_display_status(&err_minor_status, minor_status, GSS_C_MECH_CODE,
620 GSS_C_NULL_OID, &msg_ctx, &minor_status_string);
621
622 DEBUG_printf(("1%s: %s, %s", message, (char *)major_status_string.value,
623 (char *)minor_status_string.value));
624
625 gss_release_buffer(&err_minor_status, &major_status_string);
626 gss_release_buffer(&err_minor_status, &minor_status_string);
627 }
628 # endif /* DEBUG */
629 #endif /* HAVE_GSSAPI */
630
631
632 /*
633 * 'cups_local_auth()' - Get the local authorization certificate if
634 * available/applicable.
635 */
636
637 static int /* O - 0 if available */
638 /* 1 if not available */
639 /* -1 error */
cups_local_auth(http_t * http)640 cups_local_auth(http_t *http) /* I - HTTP connection to server */
641 {
642 #if defined(WIN32) || defined(__EMX__)
643 /*
644 * Currently WIN32 and OS-2 do not support the CUPS server...
645 */
646
647 return (1);
648 #else
649 int pid; /* Current process ID */
650 FILE *fp; /* Certificate file */
651 char trc[16], /* Try Root Certificate parameter */
652 filename[1024]; /* Certificate filename */
653 _cups_globals_t *cg = _cupsGlobals(); /* Global data */
654 # if defined(HAVE_AUTHORIZATION_H)
655 OSStatus status; /* Status */
656 AuthorizationItem auth_right; /* Authorization right */
657 AuthorizationRights auth_rights; /* Authorization rights */
658 AuthorizationFlags auth_flags; /* Authorization flags */
659 AuthorizationExternalForm auth_extrn; /* Authorization ref external */
660 char auth_key[1024]; /* Buffer */
661 char buffer[1024]; /* Buffer */
662 # endif /* HAVE_AUTHORIZATION_H */
663
664
665 DEBUG_printf(("7cups_local_auth(http=%p) hostaddr=%s, hostname=\"%s\"", (void *)http, httpAddrString(http->hostaddr, filename, sizeof(filename)), http->hostname));
666
667 /*
668 * See if we are accessing localhost...
669 */
670
671 if (!httpAddrLocalhost(http->hostaddr) &&
672 _cups_strcasecmp(http->hostname, "localhost") != 0)
673 {
674 DEBUG_puts("8cups_local_auth: Not a local connection!");
675 return (1);
676 }
677
678 # if defined(HAVE_AUTHORIZATION_H)
679 /*
680 * Delete any previous authorization reference...
681 */
682
683 if (http->auth_ref)
684 {
685 AuthorizationFree(http->auth_ref, kAuthorizationFlagDefaults);
686 http->auth_ref = NULL;
687 }
688
689 if (!getenv("GATEWAY_INTERFACE") &&
690 httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
691 auth_key, sizeof(auth_key)))
692 {
693 status = AuthorizationCreate(NULL, kAuthorizationEmptyEnvironment,
694 kAuthorizationFlagDefaults, &http->auth_ref);
695 if (status != errAuthorizationSuccess)
696 {
697 DEBUG_printf(("8cups_local_auth: AuthorizationCreate() returned %d (%s)",
698 (int)status, cssmErrorString(status)));
699 return (-1);
700 }
701
702 auth_right.name = auth_key;
703 auth_right.valueLength = 0;
704 auth_right.value = NULL;
705 auth_right.flags = 0;
706
707 auth_rights.count = 1;
708 auth_rights.items = &auth_right;
709
710 auth_flags = kAuthorizationFlagDefaults |
711 kAuthorizationFlagPreAuthorize |
712 kAuthorizationFlagInteractionAllowed |
713 kAuthorizationFlagExtendRights;
714
715 status = AuthorizationCopyRights(http->auth_ref, &auth_rights,
716 kAuthorizationEmptyEnvironment,
717 auth_flags, NULL);
718 if (status == errAuthorizationSuccess)
719 status = AuthorizationMakeExternalForm(http->auth_ref, &auth_extrn);
720
721 if (status == errAuthorizationSuccess)
722 {
723 /*
724 * Set the authorization string and return...
725 */
726
727 httpEncode64_2(buffer, sizeof(buffer), (void *)&auth_extrn,
728 sizeof(auth_extrn));
729
730 httpSetAuthString(http, "AuthRef", buffer);
731
732 DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
733 http->authstring));
734 return (0);
735 }
736 else if (status == errAuthorizationCanceled)
737 return (-1);
738
739 DEBUG_printf(("9cups_local_auth: AuthorizationCopyRights() returned %d (%s)",
740 (int)status, cssmErrorString(status)));
741
742 /*
743 * Fall through to try certificates...
744 */
745 }
746 # endif /* HAVE_AUTHORIZATION_H */
747
748 # if defined(SO_PEERCRED) && defined(AF_LOCAL)
749 /*
750 * See if we can authenticate using the peer credentials provided over a
751 * domain socket; if so, specify "PeerCred username" as the authentication
752 * information...
753 */
754
755 if (
756 # ifdef HAVE_GSSAPI
757 _cups_strncasecmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9) &&
758 # endif /* HAVE_GSSAPI */
759 # ifdef HAVE_AUTHORIZATION_H
760 !httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
761 auth_key, sizeof(auth_key)) &&
762 # endif /* HAVE_AUTHORIZATION_H */
763 http->hostaddr->addr.sa_family == AF_LOCAL &&
764 !getenv("GATEWAY_INTERFACE")) /* Not via CGI programs... */
765 {
766 /*
767 * Verify that the current cupsUser() matches the current UID...
768 */
769
770 struct passwd *pwd; /* Password information */
771 const char *username; /* Current username */
772
773 username = cupsUser();
774
775 if ((pwd = getpwnam(username)) != NULL && pwd->pw_uid == getuid())
776 {
777 httpSetAuthString(http, "PeerCred", username);
778
779 DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
780 http->authstring));
781
782 return (0);
783 }
784 }
785 # endif /* SO_PEERCRED && AF_LOCAL */
786
787 /*
788 * Try opening a certificate file for this PID. If that fails,
789 * try the root certificate...
790 */
791
792 pid = getpid();
793 snprintf(filename, sizeof(filename), "%s/certs/%d", cg->cups_statedir, pid);
794 if ((fp = fopen(filename, "r")) == NULL && pid > 0)
795 {
796 /*
797 * No certificate for this PID; see if we can get the root certificate...
798 */
799
800 DEBUG_printf(("9cups_local_auth: Unable to open file %s: %s",
801 filename, strerror(errno)));
802
803 # ifdef HAVE_GSSAPI
804 if (!_cups_strncasecmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9))
805 {
806 /*
807 * Kerberos required, don't try the root certificate...
808 */
809
810 return (1);
811 }
812 # endif /* HAVE_GSSAPI */
813
814 # ifdef HAVE_AUTHORIZATION_H
815 if (httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
816 auth_key, sizeof(auth_key)))
817 {
818 /*
819 * Don't use the root certificate as a replacement for an authkey...
820 */
821
822 return (1);
823 }
824 # endif /* HAVE_AUTHORIZATION_H */
825 if (!httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "trc", trc,
826 sizeof(trc)))
827 {
828 /*
829 * Scheduler doesn't want us to use the root certificate...
830 */
831
832 return (1);
833 }
834
835 snprintf(filename, sizeof(filename), "%s/certs/0", cg->cups_statedir);
836 fp = fopen(filename, "r");
837 }
838
839 if (fp)
840 {
841 /*
842 * Read the certificate from the file...
843 */
844
845 char certificate[33], /* Certificate string */
846 *certptr; /* Pointer to certificate string */
847
848 certptr = fgets(certificate, sizeof(certificate), fp);
849 fclose(fp);
850
851 if (certptr)
852 {
853 /*
854 * Set the authorization string and return...
855 */
856
857 httpSetAuthString(http, "Local", certificate);
858
859 DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
860 http->authstring));
861
862 return (0);
863 }
864 }
865
866 return (1);
867 #endif /* WIN32 || __EMX__ */
868 }
869