1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724
|
/*
* "$Id: auth.c 9061 2010-03-30 22:07:33Z mike $"
*
* Authentication functions for the Common UNIX Printing System (CUPS).
*
* Copyright 2007-2010 by Apple Inc.
* 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 Apple Inc. and are protected by Federal copyright
* law. Distribution and use rights are outlined in the file "LICENSE.txt"
* which should have been included with this file. If this file is
* file is missing or damaged, see the license at "http://www.cups.org/".
*
* This file is subject to the Apple OS-Developed Software exception.
*
* Contents:
*
* cupsDoAuthentication() - Authenticate a request.
* cups_get_gssname() - Get GSSAPI name for authentication.
* cups_gss_printf() - Show error messages from GSSAPI...
* 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 */
#if defined(SO_PEERCRED) && defined(AF_LOCAL)
# include <pwd.h>
#endif /* SO_PEERCRED && AF_LOCAL */
/*
* Local functions...
*/
#ifdef HAVE_GSSAPI
static gss_name_t cups_get_gssname(http_t *http, const char *service_name);
# ifdef DEBUG
static void cups_gss_printf(OM_uint32 major_status, OM_uint32 minor_status,
const char *message);
# else
# define cups_gss_printf(major, minor, message)
# endif /* DEBUG */
#endif /* HAVE_GSSAPI */
static int cups_local_auth(http_t *http);
/*
* 'cupsDoAuthentication()' - Authenticate a request.
*
* This function should be called in response to a @code HTTP_UNAUTHORIZED@
* status, prior to resubmitting your request.
*
* @since CUPS 1.1.20/Mac OS X 10.4@
*/
int /* O - 0 on success, -1 on error */
cupsDoAuthentication(
http_t *http, /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
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 */
int localauth; /* Local authentication result */
_cups_globals_t *cg; /* Global data */
DEBUG_printf(("cupsDoAuthentication(http=%p, method=\"%s\", resource=\"%s\")",
http, method, resource));
if (!http)
http = _cupsConnect();
if (!http || !method || !resource)
return (-1);
DEBUG_printf(("2cupsDoAuthentication: digest_tries=%d, userpass=\"%s\"",
http->digest_tries, http->userpass));
DEBUG_printf(("2cupsDoAuthentication: WWW-Authenticate=\"%s\"",
httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE)));
/*
* Clear the current authentication string...
*/
httpSetAuthString(http, NULL, NULL);
/*
* See if we can do local authentication...
*/
if (http->digest_tries < 3)
{
if ((localauth = cups_local_auth(http)) == 0)
{
DEBUG_printf(("2cupsDoAuthentication: authstring=\"%s\"",
http->authstring));
if (http->status == HTTP_UNAUTHORIZED)
http->digest_tries ++;
return (0);
}
else if (localauth == -1)
{
http->status = HTTP_AUTHORIZATION_CANCELED;
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 = cupsGetPassword2(prompt, http, method, resource)) == NULL)
{
http->status = HTTP_AUTHORIZATION_CANCELED;
return (-1);
}
if (!password[0])
{
http->status = HTTP_AUTHORIZATION_CANCELED;
return (-1);
}
snprintf(http->userpass, sizeof(http->userpass), "%s:%s", cupsUser(),
password);
}
else if (http->status == HTTP_UNAUTHORIZED)
http->digest_tries ++;
if (http->status == HTTP_UNAUTHORIZED && http->digest_tries >= 3)
{
DEBUG_printf(("1cupsDoAuthentication: Too many authentication tries (%d)",
http->digest_tries));
http->status = HTTP_AUTHORIZATION_CANCELED;
return (-1);
}
/*
* 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 */
# ifdef USE_SPNEGO
const char *authorization;
/* Pointer into Authorization string */
# endif /* USE_SPNEGO */
# 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("1cupsDoAuthentication: Weak-linked GSSAPI/Kerberos framework "
"is not present");
http->status = HTTP_AUTHORIZATION_CANCELED;
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("2cupsDoAuthentication: GSS service name set via "
"environment variable");
http->gssname = cups_get_gssname(http, gss_service_name);
}
# ifdef USE_SPNEGO /* We don't implement SPNEGO just yet... */
/*
* 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)
{
/*
* Decode the authorization string to get the input token...
*/
int len = strlen(authorization);
input_token.value = malloc(len);
input_token.value = httpDecode64_2(input_token.value, &len,
authorization);
input_token.length = len;
# ifdef DEBUG
{
char *ptr = (char *)input_token.value;
int left = len;
fputs("input_token=", stdout);
while (left > 0)
{
if (*ptr < ' ')
printf("\\%03o", *ptr & 255);
else
putchar(*ptr);
ptr ++;
left --;
}
putchar('\n');
}
# endif /* DEBUG */
}
# endif /* USE_SPNEGO */
if (http->gssctx != GSS_C_NO_CONTEXT)
{
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,
#ifdef GSS_C_DELEG_POLICY_FLAG
GSS_C_DELEG_POLICY_FLAG |
#endif /* GSS_C_DELEG_POLICY_FLAG */
GSS_C_MUTUAL_FLAG | GSS_C_INTEG_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))
{
cups_gss_printf(major_status, minor_status,
"cupsDoAuthentication: Unable to initialize security "
"context");
http->status = HTTP_AUTHORIZATION_CANCELED;
return (-1);
}
if (major_status == GSS_S_CONTINUE_NEEDED)
cups_gss_printf(major_status, minor_status,
"cupsDoAuthentication: Continuation needed!");
if (output_token.length > 0 && output_token.length <= 65536)
{
/*
* Allocate the authorization string since Windows KDCs can have
* arbitrarily large credentials...
*/
int authsize = 10 + /* "Negotiate " */
output_token.length * 4 / 3 + 1 + /* Base64 */
1; /* nul */
httpSetAuthString(http, NULL, NULL);
if ((http->authstring = malloc(authsize)) == NULL)
{
http->authstring = http->_authstring;
authsize = sizeof(http->_authstring);
}
strcpy(http->authstring, "Negotiate ");
httpEncode64_2(http->authstring + 10, authsize - 10, output_token.value,
output_token.length);
gss_release_buffer(&minor_status, &output_token);
}
else
{
DEBUG_printf(("1cupsDoAuthentication: Kerberos credentials too large - "
"%d bytes!", (int)output_token.length));
http->status = HTTP_AUTHORIZATION_CANCELED;
gss_release_buffer(&minor_status, &output_token);
return (-1);
}
#endif /* HAVE_GSSAPI */
}
else if (strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Digest", 6))
{
/*
* Basic authentication...
*/
char encode[256]; /* Base64 buffer */
httpEncode64_2(encode, sizeof(encode), http->userpass,
(int)strlen(http->userpass));
httpSetAuthString(http, "Basic", encode);
}
else
{
/*
* Digest authentication...
*/
char encode[33], /* MD5 buffer */
digest[1024]; /* Digest auth data */
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(digest, sizeof(digest),
"username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", "
"response=\"%s\"", cupsUser(), realm, nonce, resource, encode);
httpSetAuthString(http, "Digest", digest);
}
DEBUG_printf(("1cupsDoAuthentication: authstring=\"%s\"", http->authstring));
return (0);
}
#ifdef HAVE_GSSAPI
/*
* 'cups_get_gssname()' - Get CUPS service credentials for authentication.
*/
static gss_name_t /* O - Server name */
cups_get_gssname(
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 */
DEBUG_printf(("7cups_get_gssname(http=%p, service_name=\"%s\")", http,
service_name));
/*
* Get the hostname...
*/
httpGetHostname(http, fqdn, sizeof(fqdn));
if (!strcmp(fqdn, "localhost"))
httpGetHostname(NULL, fqdn, sizeof(fqdn));
/*
* Get a server name we can use for authentication purposes...
*/
snprintf(buf, sizeof(buf), "%s@%s", service_name, fqdn);
DEBUG_printf(("9cups_get_gssname: Looking up %s...", buf));
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))
{
cups_gss_printf(major_status, minor_status,
"cups_get_gssname: gss_import_name() failed");
return (NULL);
}
return (server_name);
}
# ifdef DEBUG
/*
* 'cups_gss_printf()' - Show debug error messages from GSSAPI...
*/
static void
cups_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))
gss_display_status(&err_minor_status, minor_status, GSS_C_MECH_CODE,
GSS_C_NULL_OID, &msg_ctx, &minor_status_string);
DEBUG_printf(("1%s: %s, %s", 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 */
#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 trc[16], /* Try Root Certificate parameter */
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(("7cups_local_auth(http=%p) hostaddr=%s, hostname=\"%s\"",
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("8cups_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 (!getenv("GATEWAY_INTERFACE") &&
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(("8cups_local_auth: AuthorizationCreate() returned %d (%s)",
(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));
httpSetAuthString(http, "AuthRef", buffer);
DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
http->authstring));
return (0);
}
else if (status == errAuthorizationCanceled)
return (-1);
DEBUG_printf(("9cups_local_auth: AuthorizationCopyRights() returned %d (%s)",
(int)status, cssmErrorString(status)));
/*
* Fall through to try certificates...
*/
}
# endif /* HAVE_AUTHORIZATION_H */
# if defined(SO_PEERCRED) && defined(AF_LOCAL)
/*
* See if we can authenticate using the peer credentials provided over a
* domain socket; if so, specify "PeerCred username" as the authentication
* information...
*/
# ifdef HAVE_GSSAPI
if (strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9) &&
# else
if (
# endif /* HAVE_GSSAPI */
http->hostaddr->addr.sa_family == AF_LOCAL &&
!getenv("GATEWAY_INTERFACE")) /* Not via CGI programs... */
{
/*
* Verify that the current cupsUser() matches the current UID...
*/
struct passwd *pwd; /* Password information */
const char *username; /* Current username */
username = cupsUser();
if ((pwd = getpwnam(username)) != NULL && pwd->pw_uid == getuid())
{
httpSetAuthString(http, "PeerCred", username);
DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
http->authstring));
return (0);
}
}
# endif /* SO_PEERCRED && AF_LOCAL */
/*
* 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)
{
/*
* No certificate for this PID; see if we can get the root certificate...
*/
DEBUG_printf(("9cups_local_auth: Unable to open file %s: %s",
filename, strerror(errno)));
#ifdef HAVE_GSSAPI
if (!strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9))
{
/*
* Kerberos required, don't try the root certificate...
*/
return (1);
}
#endif /* HAVE_GSSAPI */
if (!httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "trc", trc,
sizeof(trc)))
{
/*
* Scheduler doesn't want us to use the root certificate...
*/
return (1);
}
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...
*/
httpSetAuthString(http, "Local", certificate);
DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
http->authstring));
return (0);
}
return (1);
#endif /* WIN32 || __EMX__ */
}
/*
* End of "$Id: auth.c 9061 2010-03-30 22:07:33Z mike $".
*/
|