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1134 lines
31 KiB
1134 lines
31 KiB
/*
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* Authentication functions for CUPS.
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*
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* Copyright 2007-2019 by Apple Inc.
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* Copyright 1997-2007 by Easy Software Products.
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*
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* This file contains Kerberos support code, copyright 2006 by
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* Jelmer Vernooij.
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*
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* Licensed under Apache License v2.0. See the file "LICENSE" for more information.
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*/
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/*
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* Include necessary headers...
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*/
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#include "cups-private.h"
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#include "debug-internal.h"
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#include <fcntl.h>
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#include <sys/stat.h>
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#if defined(_WIN32) || defined(__EMX__)
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# include <io.h>
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#else
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# include <unistd.h>
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#endif /* _WIN32 || __EMX__ */
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#if HAVE_AUTHORIZATION_H
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# include <Security/Authorization.h>
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#endif /* HAVE_AUTHORIZATION_H */
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#if defined(SO_PEERCRED) && defined(AF_LOCAL)
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# include <pwd.h>
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#endif /* SO_PEERCRED && AF_LOCAL */
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/*
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* Local functions...
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*/
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static const char *cups_auth_find(const char *www_authenticate, const char *scheme);
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static const char *cups_auth_param(const char *scheme, const char *name, char *value, size_t valsize);
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static const char *cups_auth_scheme(const char *www_authenticate, char *scheme, size_t schemesize);
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#ifdef HAVE_GSSAPI
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# define CUPS_GSS_OK 0 /* Successfully set credentials */
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# define CUPS_GSS_NONE -1 /* No credentials */
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# define CUPS_GSS_FAIL -2 /* Failed credentials/authentication */
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# ifdef HAVE_GSS_ACQUIRE_CRED_EX_F
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# ifdef HAVE_GSS_GSSAPI_SPI_H
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# include <GSS/gssapi_spi.h>
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# else
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# define GSS_AUTH_IDENTITY_TYPE_1 1
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# define gss_acquire_cred_ex_f __ApplePrivate_gss_acquire_cred_ex_f
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typedef struct gss_auth_identity /* @private@ */
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{
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uint32_t type;
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uint32_t flags;
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char *username;
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char *realm;
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char *password;
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gss_buffer_t *credentialsRef;
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} gss_auth_identity_desc;
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extern OM_uint32 gss_acquire_cred_ex_f(gss_status_id_t, const gss_name_t,
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OM_uint32, OM_uint32, const gss_OID,
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gss_cred_usage_t, gss_auth_identity_t,
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void *, void (*)(void *, OM_uint32,
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gss_status_id_t,
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gss_cred_id_t,
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gss_OID_set,
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OM_uint32));
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# endif /* HAVE_GSS_GSSAPI_SPI_H */
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# include <dispatch/dispatch.h>
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typedef struct _cups_gss_acquire_s /* Acquire callback data */
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{
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dispatch_semaphore_t sem; /* Synchronization semaphore */
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OM_uint32 major; /* Returned status code */
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gss_cred_id_t creds; /* Returned credentials */
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} _cups_gss_acquire_t;
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static void cups_gss_acquire(void *ctx, OM_uint32 major,
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gss_status_id_t status,
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gss_cred_id_t creds, gss_OID_set oids,
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OM_uint32 time_rec);
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# endif /* HAVE_GSS_ACQUIRE_CRED_EX_F */
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static gss_name_t cups_gss_getname(http_t *http, const char *service_name);
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# ifdef DEBUG
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static void cups_gss_printf(OM_uint32 major_status, OM_uint32 minor_status,
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const char *message);
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# else
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# define cups_gss_printf(major, minor, message)
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# endif /* DEBUG */
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#endif /* HAVE_GSSAPI */
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static int cups_local_auth(http_t *http);
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/*
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* 'cupsDoAuthentication()' - Authenticate a request.
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*
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* This function should be called in response to a @code HTTP_STATUS_UNAUTHORIZED@
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* status, prior to resubmitting your request.
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*
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* @since CUPS 1.1.20/macOS 10.4@
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*/
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int /* O - 0 on success, -1 on error */
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cupsDoAuthentication(
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http_t *http, /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
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const char *method, /* I - Request method ("GET", "POST", "PUT") */
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const char *resource) /* I - Resource path */
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{
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const char *password, /* Password string */
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*www_auth, /* WWW-Authenticate header */
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*schemedata; /* Scheme-specific data */
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char scheme[256], /* Scheme name */
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prompt[1024]; /* Prompt for user */
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int localauth; /* Local authentication result */
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_cups_globals_t *cg; /* Global data */
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DEBUG_printf(("cupsDoAuthentication(http=%p, method=\"%s\", resource=\"%s\")", (void *)http, method, resource));
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if (!http)
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http = _cupsConnect();
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if (!http || !method || !resource)
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return (-1);
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DEBUG_printf(("2cupsDoAuthentication: digest_tries=%d, userpass=\"%s\"",
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http->digest_tries, http->userpass));
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DEBUG_printf(("2cupsDoAuthentication: WWW-Authenticate=\"%s\"",
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httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE)));
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/*
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* Clear the current authentication string...
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*/
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httpSetAuthString(http, NULL, NULL);
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/*
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* See if we can do local authentication...
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*/
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if (http->digest_tries < 3)
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{
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if ((localauth = cups_local_auth(http)) == 0)
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{
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DEBUG_printf(("2cupsDoAuthentication: authstring=\"%s\"",
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http->authstring));
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if (http->status == HTTP_STATUS_UNAUTHORIZED)
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http->digest_tries ++;
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return (0);
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}
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else if (localauth == -1)
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{
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http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
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return (-1); /* Error or canceled */
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}
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}
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/*
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* Nope, loop through the authentication schemes to find the first we support.
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*/
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www_auth = httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE);
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for (schemedata = cups_auth_scheme(www_auth, scheme, sizeof(scheme)); schemedata; schemedata = cups_auth_scheme(schemedata + strlen(scheme), scheme, sizeof(scheme)))
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{
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/*
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* Check the scheme name...
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*/
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DEBUG_printf(("2cupsDoAuthentication: Trying scheme \"%s\"...", scheme));
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#ifdef HAVE_GSSAPI
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if (!_cups_strcasecmp(scheme, "Negotiate"))
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{
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/*
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* Kerberos authentication...
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*/
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int gss_status; /* Auth status */
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if ((gss_status = _cupsSetNegotiateAuthString(http, method, resource)) == CUPS_GSS_FAIL)
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{
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DEBUG_puts("1cupsDoAuthentication: Negotiate failed.");
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http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
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return (-1);
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}
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else if (gss_status == CUPS_GSS_NONE)
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{
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DEBUG_puts("2cupsDoAuthentication: No credentials for Negotiate.");
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continue;
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}
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else
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{
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DEBUG_puts("2cupsDoAuthentication: Using Negotiate.");
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break;
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}
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}
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else
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#endif /* HAVE_GSSAPI */
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if (_cups_strcasecmp(scheme, "Basic") && _cups_strcasecmp(scheme, "Digest"))
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{
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/*
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* Other schemes not yet supported...
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*/
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DEBUG_printf(("2cupsDoAuthentication: Scheme \"%s\" not yet supported.", scheme));
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continue;
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}
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/*
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* See if we should retry the current username:password...
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*/
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if ((http->digest_tries > 1 || !http->userpass[0]) && (!_cups_strcasecmp(scheme, "Basic") || (!_cups_strcasecmp(scheme, "Digest"))))
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{
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/*
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* Nope - get a new password from the user...
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*/
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char default_username[HTTP_MAX_VALUE];
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/* Default username */
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cg = _cupsGlobals();
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if (!cg->lang_default)
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cg->lang_default = cupsLangDefault();
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if (cups_auth_param(schemedata, "username", default_username, sizeof(default_username)))
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cupsSetUser(default_username);
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snprintf(prompt, sizeof(prompt), _cupsLangString(cg->lang_default, _("Password for %s on %s? ")), cupsUser(), http->hostname[0] == '/' ? "localhost" : http->hostname);
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http->digest_tries = _cups_strncasecmp(scheme, "Digest", 6) != 0;
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http->userpass[0] = '\0';
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if ((password = cupsGetPassword2(prompt, http, method, resource)) == NULL)
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{
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DEBUG_puts("1cupsDoAuthentication: User canceled password request.");
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http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
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return (-1);
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}
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snprintf(http->userpass, sizeof(http->userpass), "%s:%s", cupsUser(), password);
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}
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else if (http->status == HTTP_STATUS_UNAUTHORIZED)
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http->digest_tries ++;
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if (http->status == HTTP_STATUS_UNAUTHORIZED && http->digest_tries >= 3)
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{
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DEBUG_printf(("1cupsDoAuthentication: Too many authentication tries (%d)", http->digest_tries));
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http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
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return (-1);
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}
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/*
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* Got a password; encode it for the server...
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*/
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if (!_cups_strcasecmp(scheme, "Basic"))
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{
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/*
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* Basic authentication...
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*/
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char encode[256]; /* Base64 buffer */
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DEBUG_puts("2cupsDoAuthentication: Using Basic.");
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httpEncode64_2(encode, sizeof(encode), http->userpass, (int)strlen(http->userpass));
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httpSetAuthString(http, "Basic", encode);
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break;
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}
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else if (!_cups_strcasecmp(scheme, "Digest"))
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{
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/*
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* Digest authentication...
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*/
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char nonce[HTTP_MAX_VALUE]; /* nonce="xyz" string */
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cups_auth_param(schemedata, "algorithm", http->algorithm, sizeof(http->algorithm));
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cups_auth_param(schemedata, "opaque", http->opaque, sizeof(http->opaque));
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cups_auth_param(schemedata, "nonce", nonce, sizeof(nonce));
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cups_auth_param(schemedata, "realm", http->realm, sizeof(http->realm));
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if (_httpSetDigestAuthString(http, nonce, method, resource))
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{
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DEBUG_puts("2cupsDoAuthentication: Using Digest.");
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break;
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}
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}
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}
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if (http->authstring)
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{
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DEBUG_printf(("1cupsDoAuthentication: authstring=\"%s\".", http->authstring));
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return (0);
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}
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else
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{
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DEBUG_puts("1cupsDoAuthentication: No supported schemes.");
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http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
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return (-1);
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}
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}
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#ifdef HAVE_GSSAPI
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/*
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* '_cupsSetNegotiateAuthString()' - Set the Kerberos authentication string.
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*/
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int /* O - 0 on success, negative on error */
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_cupsSetNegotiateAuthString(
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http_t *http, /* I - Connection to server */
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const char *method, /* I - Request method ("GET", "POST", "PUT") */
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const char *resource) /* I - Resource path */
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{
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OM_uint32 minor_status, /* Minor status code */
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major_status; /* Major status code */
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gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
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/* Output token */
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|
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(void)method;
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(void)resource;
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# ifdef __APPLE__
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/*
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* If the weak-linked GSSAPI/Kerberos library is not present, don't try
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* to use it...
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*/
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if (&gss_init_sec_context == NULL)
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{
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DEBUG_puts("1_cupsSetNegotiateAuthString: Weak-linked GSSAPI/Kerberos "
|
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"framework is not present");
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return (CUPS_GSS_NONE);
|
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}
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# endif /* __APPLE__ */
|
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if (!strcmp(http->hostname, "localhost") || http->hostname[0] == '/' || isdigit(http->hostname[0] & 255) || !strchr(http->hostname, '.'))
|
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{
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DEBUG_printf(("1_cupsSetNegotiateAuthString: Kerberos not available for host \"%s\".", http->hostname));
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return (CUPS_GSS_NONE);
|
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}
|
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|
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if (http->gssname == GSS_C_NO_NAME)
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{
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http->gssname = cups_gss_getname(http, _cupsGSSServiceName());
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}
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if (http->gssctx != GSS_C_NO_CONTEXT)
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{
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gss_delete_sec_context(&minor_status, &http->gssctx, GSS_C_NO_BUFFER);
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http->gssctx = GSS_C_NO_CONTEXT;
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}
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major_status = gss_init_sec_context(&minor_status, GSS_C_NO_CREDENTIAL,
|
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&http->gssctx,
|
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http->gssname, http->gssmech,
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GSS_C_MUTUAL_FLAG | GSS_C_INTEG_FLAG,
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GSS_C_INDEFINITE,
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GSS_C_NO_CHANNEL_BINDINGS,
|
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GSS_C_NO_BUFFER, &http->gssmech,
|
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&output_token, NULL, NULL);
|
|
|
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# ifdef HAVE_GSS_ACQUIRE_CRED_EX_F
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if (major_status == GSS_S_NO_CRED)
|
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{
|
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/*
|
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* Ask the user for credentials...
|
|
*/
|
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|
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char prompt[1024], /* Prompt for user */
|
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userbuf[256]; /* Kerberos username */
|
|
const char *username, /* Username string */
|
|
*password; /* Password string */
|
|
_cups_gss_acquire_t data; /* Callback data */
|
|
gss_auth_identity_desc identity; /* Kerberos user identity */
|
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_cups_globals_t *cg = _cupsGlobals();
|
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/* Per-thread global data */
|
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|
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if (!cg->lang_default)
|
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cg->lang_default = cupsLangDefault();
|
|
|
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snprintf(prompt, sizeof(prompt),
|
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_cupsLangString(cg->lang_default, _("Password for %s on %s? ")),
|
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cupsUser(), http->gsshost);
|
|
|
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if ((password = cupsGetPassword2(prompt, http, method, resource)) == NULL)
|
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return (CUPS_GSS_FAIL);
|
|
|
|
/*
|
|
* Try to acquire credentials...
|
|
*/
|
|
|
|
username = cupsUser();
|
|
if (!strchr(username, '@'))
|
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{
|
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snprintf(userbuf, sizeof(userbuf), "%s@%s", username, http->gsshost);
|
|
username = userbuf;
|
|
}
|
|
|
|
identity.type = GSS_AUTH_IDENTITY_TYPE_1;
|
|
identity.flags = 0;
|
|
identity.username = (char *)username;
|
|
identity.realm = (char *)"";
|
|
identity.password = (char *)password;
|
|
identity.credentialsRef = NULL;
|
|
|
|
data.sem = dispatch_semaphore_create(0);
|
|
data.major = 0;
|
|
data.creds = NULL;
|
|
|
|
if (data.sem)
|
|
{
|
|
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);
|
|
|
|
if (major_status == GSS_S_COMPLETE)
|
|
{
|
|
dispatch_semaphore_wait(data.sem, DISPATCH_TIME_FOREVER);
|
|
major_status = data.major;
|
|
}
|
|
|
|
dispatch_release(data.sem);
|
|
|
|
if (major_status == GSS_S_COMPLETE)
|
|
{
|
|
OM_uint32 release_minor; /* Minor status from releasing creds */
|
|
|
|
major_status = gss_init_sec_context(&minor_status, data.creds,
|
|
&http->gssctx,
|
|
http->gssname, http->gssmech,
|
|
GSS_C_MUTUAL_FLAG | GSS_C_INTEG_FLAG,
|
|
GSS_C_INDEFINITE,
|
|
GSS_C_NO_CHANNEL_BINDINGS,
|
|
GSS_C_NO_BUFFER, &http->gssmech,
|
|
&output_token, NULL, NULL);
|
|
gss_release_cred(&release_minor, &data.creds);
|
|
}
|
|
}
|
|
}
|
|
# endif /* HAVE_GSS_ACQUIRED_CRED_EX_F */
|
|
|
|
if (major_status == GSS_S_NO_CRED)
|
|
{
|
|
cups_gss_printf(major_status, minor_status, "_cupsSetNegotiateAuthString: No credentials");
|
|
return (CUPS_GSS_NONE);
|
|
}
|
|
else if (GSS_ERROR(major_status))
|
|
{
|
|
cups_gss_printf(major_status, minor_status, "_cupsSetNegotiateAuthString: Unable to initialize security context");
|
|
return (CUPS_GSS_FAIL);
|
|
}
|
|
|
|
# ifdef DEBUG
|
|
else if (major_status == GSS_S_CONTINUE_NEEDED)
|
|
cups_gss_printf(major_status, minor_status, "_cupsSetNegotiateAuthString: Continuation needed");
|
|
# endif /* DEBUG */
|
|
|
|
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 " */
|
|
(((int)output_token.length * 4 / 3 + 3) & ~3) + 1;
|
|
/* Base64 + nul */
|
|
|
|
httpSetAuthString(http, NULL, NULL);
|
|
|
|
if ((http->authstring = malloc((size_t)authsize)) == NULL)
|
|
{
|
|
http->authstring = http->_authstring;
|
|
authsize = sizeof(http->_authstring);
|
|
}
|
|
|
|
strlcpy(http->authstring, "Negotiate ", (size_t)authsize);
|
|
httpEncode64_2(http->authstring + 10, authsize - 10, output_token.value,
|
|
(int)output_token.length);
|
|
|
|
gss_release_buffer(&minor_status, &output_token);
|
|
}
|
|
else
|
|
{
|
|
DEBUG_printf(("1_cupsSetNegotiateAuthString: Kerberos credentials too "
|
|
"large - %d bytes!", (int)output_token.length));
|
|
gss_release_buffer(&minor_status, &output_token);
|
|
|
|
return (CUPS_GSS_FAIL);
|
|
}
|
|
|
|
return (CUPS_GSS_OK);
|
|
}
|
|
#endif /* HAVE_GSSAPI */
|
|
|
|
|
|
/*
|
|
* 'cups_auth_find()' - Find the named WWW-Authenticate scheme.
|
|
*
|
|
* The "www_authenticate" parameter points to the current position in the header.
|
|
*
|
|
* Returns @code NULL@ if the auth scheme is not present.
|
|
*/
|
|
|
|
static const char * /* O - Start of matching scheme or @code NULL@ if not found */
|
|
cups_auth_find(const char *www_authenticate, /* I - Pointer into WWW-Authenticate header */
|
|
const char *scheme) /* I - Authentication scheme */
|
|
{
|
|
size_t schemelen = strlen(scheme); /* Length of scheme */
|
|
|
|
|
|
DEBUG_printf(("8cups_auth_find(www_authenticate=\"%s\", scheme=\"%s\"(%d))", www_authenticate, scheme, (int)schemelen));
|
|
|
|
while (*www_authenticate)
|
|
{
|
|
/*
|
|
* Skip leading whitespace and commas...
|
|
*/
|
|
|
|
DEBUG_printf(("9cups_auth_find: Before whitespace: \"%s\"", www_authenticate));
|
|
while (isspace(*www_authenticate & 255) || *www_authenticate == ',')
|
|
www_authenticate ++;
|
|
DEBUG_printf(("9cups_auth_find: After whitespace: \"%s\"", www_authenticate));
|
|
|
|
/*
|
|
* See if this is "Scheme" followed by whitespace or the end of the string.
|
|
*/
|
|
|
|
if (!strncmp(www_authenticate, scheme, schemelen) && (isspace(www_authenticate[schemelen] & 255) || www_authenticate[schemelen] == ',' || !www_authenticate[schemelen]))
|
|
{
|
|
/*
|
|
* Yes, this is the start of the scheme-specific information...
|
|
*/
|
|
|
|
DEBUG_printf(("9cups_auth_find: Returning \"%s\".", www_authenticate));
|
|
|
|
return (www_authenticate);
|
|
}
|
|
|
|
/*
|
|
* Skip the scheme name or param="value" string...
|
|
*/
|
|
|
|
while (!isspace(*www_authenticate & 255) && *www_authenticate)
|
|
{
|
|
if (*www_authenticate == '\"')
|
|
{
|
|
/*
|
|
* Skip quoted value...
|
|
*/
|
|
|
|
www_authenticate ++;
|
|
while (*www_authenticate && *www_authenticate != '\"')
|
|
www_authenticate ++;
|
|
|
|
DEBUG_printf(("9cups_auth_find: After quoted: \"%s\"", www_authenticate));
|
|
}
|
|
|
|
www_authenticate ++;
|
|
}
|
|
|
|
DEBUG_printf(("9cups_auth_find: After skip: \"%s\"", www_authenticate));
|
|
}
|
|
|
|
DEBUG_puts("9cups_auth_find: Returning NULL.");
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
|
|
/*
|
|
* 'cups_auth_param()' - Copy the value for the named authentication parameter,
|
|
* if present.
|
|
*/
|
|
|
|
static const char * /* O - Parameter value or @code NULL@ if not present */
|
|
cups_auth_param(const char *scheme, /* I - Pointer to auth data */
|
|
const char *name, /* I - Name of parameter */
|
|
char *value, /* I - Value buffer */
|
|
size_t valsize) /* I - Size of value buffer */
|
|
{
|
|
char *valptr = value, /* Pointer into value buffer */
|
|
*valend = value + valsize - 1; /* Pointer to end of buffer */
|
|
size_t namelen = strlen(name); /* Name length */
|
|
int param; /* Is this a parameter? */
|
|
|
|
|
|
DEBUG_printf(("8cups_auth_param(scheme=\"%s\", name=\"%s\", value=%p, valsize=%d)", scheme, name, (void *)value, (int)valsize));
|
|
|
|
while (!isspace(*scheme & 255) && *scheme)
|
|
scheme ++;
|
|
|
|
while (*scheme)
|
|
{
|
|
while (isspace(*scheme & 255) || *scheme == ',')
|
|
scheme ++;
|
|
|
|
if (!strncmp(scheme, name, namelen) && scheme[namelen] == '=')
|
|
{
|
|
/*
|
|
* Found the parameter, copy the value...
|
|
*/
|
|
|
|
scheme += namelen + 1;
|
|
if (*scheme == '\"')
|
|
{
|
|
scheme ++;
|
|
|
|
while (*scheme && *scheme != '\"')
|
|
{
|
|
if (valptr < valend)
|
|
*valptr++ = *scheme;
|
|
|
|
scheme ++;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
while (*scheme && strchr("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~+/=", *scheme))
|
|
{
|
|
if (valptr < valend)
|
|
*valptr++ = *scheme;
|
|
|
|
scheme ++;
|
|
}
|
|
}
|
|
|
|
*valptr = '\0';
|
|
|
|
DEBUG_printf(("9cups_auth_param: Returning \"%s\".", value));
|
|
|
|
return (value);
|
|
}
|
|
|
|
/*
|
|
* Skip the param=value string...
|
|
*/
|
|
|
|
param = 0;
|
|
|
|
while (!isspace(*scheme & 255) && *scheme)
|
|
{
|
|
if (*scheme == '=')
|
|
param = 1;
|
|
else if (*scheme == '\"')
|
|
{
|
|
/*
|
|
* Skip quoted value...
|
|
*/
|
|
|
|
scheme ++;
|
|
while (*scheme && *scheme != '\"')
|
|
scheme ++;
|
|
}
|
|
|
|
scheme ++;
|
|
}
|
|
|
|
/*
|
|
* If this wasn't a parameter, we are at the end of this scheme's
|
|
* parameters...
|
|
*/
|
|
|
|
if (!param)
|
|
break;
|
|
}
|
|
|
|
*value = '\0';
|
|
|
|
DEBUG_puts("9cups_auth_param: Returning NULL.");
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
|
|
/*
|
|
* 'cups_auth_scheme()' - Get the (next) WWW-Authenticate scheme.
|
|
*
|
|
* The "www_authenticate" parameter points to the current position in the header.
|
|
*
|
|
* Returns @code NULL@ if there are no (more) auth schemes present.
|
|
*/
|
|
|
|
static const char * /* O - Start of scheme or @code NULL@ if not found */
|
|
cups_auth_scheme(const char *www_authenticate, /* I - Pointer into WWW-Authenticate header */
|
|
char *scheme, /* I - Scheme name buffer */
|
|
size_t schemesize) /* I - Size of buffer */
|
|
{
|
|
const char *start; /* Start of scheme data */
|
|
char *sptr = scheme, /* Pointer into scheme buffer */
|
|
*send = scheme + schemesize - 1;/* End of scheme buffer */
|
|
int param; /* Is this a parameter? */
|
|
|
|
|
|
DEBUG_printf(("8cups_auth_scheme(www_authenticate=\"%s\", scheme=%p, schemesize=%d)", www_authenticate, (void *)scheme, (int)schemesize));
|
|
|
|
while (*www_authenticate)
|
|
{
|
|
/*
|
|
* Skip leading whitespace and commas...
|
|
*/
|
|
|
|
while (isspace(*www_authenticate & 255) || *www_authenticate == ',')
|
|
www_authenticate ++;
|
|
|
|
/*
|
|
* Parse the scheme name or param="value" string...
|
|
*/
|
|
|
|
for (sptr = scheme, start = www_authenticate, param = 0; *www_authenticate && *www_authenticate != ',' && !isspace(*www_authenticate & 255); www_authenticate ++)
|
|
{
|
|
if (*www_authenticate == '=')
|
|
param = 1;
|
|
else if (!param && sptr < send)
|
|
*sptr++ = *www_authenticate;
|
|
else if (*www_authenticate == '\"')
|
|
{
|
|
/*
|
|
* Skip quoted value...
|
|
*/
|
|
|
|
www_authenticate ++;
|
|
while (*www_authenticate && *www_authenticate != '\"')
|
|
www_authenticate ++;
|
|
}
|
|
}
|
|
|
|
if (sptr > scheme && !param)
|
|
{
|
|
*sptr = '\0';
|
|
|
|
DEBUG_printf(("9cups_auth_scheme: Returning \"%s\".", start));
|
|
|
|
return (start);
|
|
}
|
|
}
|
|
|
|
*scheme = '\0';
|
|
|
|
DEBUG_puts("9cups_auth_scheme: Returning NULL.");
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
|
|
#ifdef HAVE_GSSAPI
|
|
# ifdef HAVE_GSS_ACQUIRE_CRED_EX_F
|
|
/*
|
|
* 'cups_gss_acquire()' - Kerberos credentials callback.
|
|
*/
|
|
static void
|
|
cups_gss_acquire(
|
|
void *ctx, /* I - Caller context */
|
|
OM_uint32 major, /* I - Major error code */
|
|
gss_status_id_t status, /* I - Status (unused) */
|
|
gss_cred_id_t creds, /* I - Credentials (if any) */
|
|
gss_OID_set oids, /* I - Mechanism OIDs (unused) */
|
|
OM_uint32 time_rec) /* I - Timestamp (unused) */
|
|
{
|
|
uint32_t min; /* Minor error code */
|
|
_cups_gss_acquire_t *data; /* Callback data */
|
|
|
|
|
|
(void)status;
|
|
(void)time_rec;
|
|
|
|
data = (_cups_gss_acquire_t *)ctx;
|
|
data->major = major;
|
|
data->creds = creds;
|
|
|
|
gss_release_oid_set(&min, &oids);
|
|
dispatch_semaphore_signal(data->sem);
|
|
}
|
|
# endif /* HAVE_GSS_ACQUIRE_CRED_EX_F */
|
|
|
|
|
|
/*
|
|
* 'cups_gss_getname()' - Get CUPS service credentials for authentication.
|
|
*/
|
|
|
|
static gss_name_t /* O - Server name */
|
|
cups_gss_getname(
|
|
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 */
|
|
|
|
|
|
DEBUG_printf(("7cups_gss_getname(http=%p, service_name=\"%s\")", http,
|
|
service_name));
|
|
|
|
|
|
/*
|
|
* Get the hostname...
|
|
*/
|
|
|
|
if (!http->gsshost[0])
|
|
{
|
|
httpGetHostname(http, http->gsshost, sizeof(http->gsshost));
|
|
|
|
if (!strcmp(http->gsshost, "localhost"))
|
|
{
|
|
if (gethostname(http->gsshost, sizeof(http->gsshost)) < 0)
|
|
{
|
|
DEBUG_printf(("1cups_gss_getname: gethostname() failed: %s",
|
|
strerror(errno)));
|
|
http->gsshost[0] = '\0';
|
|
return (NULL);
|
|
}
|
|
|
|
if (!strchr(http->gsshost, '.'))
|
|
{
|
|
/*
|
|
* The hostname is not a FQDN, so look it up...
|
|
*/
|
|
|
|
struct hostent *host; /* Host entry to get FQDN */
|
|
|
|
if ((host = gethostbyname(http->gsshost)) != NULL && host->h_name)
|
|
{
|
|
/*
|
|
* Use the resolved hostname...
|
|
*/
|
|
|
|
strlcpy(http->gsshost, host->h_name, sizeof(http->gsshost));
|
|
}
|
|
else
|
|
{
|
|
DEBUG_printf(("1cups_gss_getname: gethostbyname(\"%s\") failed.",
|
|
http->gsshost));
|
|
http->gsshost[0] = '\0';
|
|
return (NULL);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Get a service name we can use for authentication purposes...
|
|
*/
|
|
|
|
snprintf(buf, sizeof(buf), "%s@%s", service_name, http->gsshost);
|
|
|
|
DEBUG_printf(("8cups_gss_getname: 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_gss_getname: 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 */
|
|
const char *www_auth, /* WWW-Authenticate header */
|
|
*schemedata; /* Data for the named auth scheme */
|
|
_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\"", (void *)http, httpAddrString(http->hostaddr, filename, sizeof(filename)), http->hostname));
|
|
|
|
/*
|
|
* See if we are accessing localhost...
|
|
*/
|
|
|
|
if (!httpAddrLocalhost(http->hostaddr) && _cups_strcasecmp(http->hostname, "localhost") != 0)
|
|
{
|
|
DEBUG_puts("8cups_local_auth: Not a local connection!");
|
|
return (1);
|
|
}
|
|
|
|
www_auth = httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE);
|
|
|
|
# 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") && (schemedata = cups_auth_find(www_auth, "AuthRef")) != NULL && cups_auth_param(schemedata, "key", auth_key, sizeof(auth_key)))
|
|
{
|
|
status = AuthorizationCreate(NULL, kAuthorizationEmptyEnvironment, kAuthorizationFlagDefaults, &http->auth_ref);
|
|
if (status != errAuthorizationSuccess)
|
|
{
|
|
DEBUG_printf(("8cups_local_auth: AuthorizationCreate() returned %d",
|
|
(int)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", (int)status));
|
|
|
|
/*
|
|
* Fall through to try certificates...
|
|
*/
|
|
}
|
|
# endif /* HAVE_AUTHORIZATION_H */
|
|
|
|
# ifdef HAVE_GSSAPI
|
|
if (cups_auth_find(www_auth, "Negotiate"))
|
|
return (1);
|
|
# endif /* HAVE_GSSAPI */
|
|
|
|
# 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...
|
|
*/
|
|
|
|
if (http->hostaddr->addr.sa_family == AF_LOCAL &&
|
|
!getenv("GATEWAY_INTERFACE") && /* Not via CGI programs... */
|
|
cups_auth_find(www_auth, "PeerCred"))
|
|
{
|
|
/*
|
|
* 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 */
|
|
|
|
if ((schemedata = cups_auth_find(www_auth, "Local")) == NULL)
|
|
return (1);
|
|
|
|
/*
|
|
* 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)));
|
|
|
|
if (!cups_auth_param(schemedata, "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);
|
|
if ((fp = fopen(filename, "r")) == NULL)
|
|
DEBUG_printf(("9cups_local_auth: Unable to open file \"%s\": %s", filename, strerror(errno)));
|
|
}
|
|
|
|
if (fp)
|
|
{
|
|
/*
|
|
* Read the certificate from the file...
|
|
*/
|
|
|
|
char certificate[33], /* Certificate string */
|
|
*certptr; /* Pointer to certificate string */
|
|
|
|
certptr = fgets(certificate, sizeof(certificate), fp);
|
|
fclose(fp);
|
|
|
|
if (certptr)
|
|
{
|
|
/*
|
|
* 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__ */
|
|
}
|