/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2008 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* * Copyright 1990 by the Massachusetts Institute of Technology. * All Rights Reserved. * * Export of this software from the United States of America may * require a specific license from the United States Government. * It is the responsibility of any person or organization contemplating * export to obtain such a license before exporting. * * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and * distribute this software and its documentation for any purpose and * without fee is hereby granted, provided that the above copyright * notice appear in all copies and that both that copyright notice and * this permission notice appear in supporting documentation, and that * the name of M.I.T. not be used in advertising or publicity pertaining * to distribution of the software without specific, written prior * permission. Furthermore if you modify this software you must label * your software as modified software and not distribute it in such a * fashion that it might be confused with the original M.I.T. software. * M.I.T. makes no representations about the suitability of * this software for any purpose. It is provided "as is" without express * or implied warranty. * * * Initialize a credentials cache. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static int krb5_acquire_cred_kinit_main(); typedef enum { INIT_PW, INIT_KT, RENEW, VALIDATE } action_type; struct k_opts { /* in seconds */ krb5_deltat starttime; krb5_deltat lifetime; krb5_deltat rlife; int forwardable; int proxiable; int addresses; int not_forwardable; int not_proxiable; int no_addresses; int verbose; char *principal_name; char *principal_passwd; char *service_name; char *keytab_name; char *k5_cache_name; char *k4_cache_name; action_type action; }; struct k5_data { krb5_context ctx; krb5_ccache cc; krb5_principal me; char *name; }; static int k5_begin(struct k_opts *opts, struct k5_data *k5) { int code; code = krb5_init_context(&k5->ctx); if (code) { return (code); } if ((code = krb5_cc_default(k5->ctx, &k5->cc))) { return (code); } /* Use specified name */ if ((code = krb5_parse_name(k5->ctx, opts->principal_name, &k5->me))) { return (code); } code = krb5_unparse_name(k5->ctx, k5->me, &k5->name); if (code) { return (code); } opts->principal_name = k5->name; return (0); } static void k5_end(struct k5_data *k5) { if (k5->name) krb5_free_unparsed_name(k5->ctx, k5->name); if (k5->me) krb5_free_principal(k5->ctx, k5->me); if (k5->cc) krb5_cc_close(k5->ctx, k5->cc); if (k5->ctx) krb5_free_context(k5->ctx); (void) memset(k5, 0, sizeof (*k5)); } static int k5_kinit(struct k_opts *opts, struct k5_data *k5) { int notix = 1; krb5_keytab keytab = 0; krb5_creds my_creds; krb5_error_code code = 0; krb5_get_init_creds_opt options; const char *errmsg; krb5_get_init_creds_opt_init(&options); (void) memset(&my_creds, 0, sizeof (my_creds)); /* * From this point on, we can goto cleanup because my_creds is * initialized. */ if (opts->lifetime) krb5_get_init_creds_opt_set_tkt_life(&options, opts->lifetime); if (opts->rlife) krb5_get_init_creds_opt_set_renew_life(&options, opts->rlife); if (opts->forwardable) krb5_get_init_creds_opt_set_forwardable(&options, 1); if (opts->not_forwardable) krb5_get_init_creds_opt_set_forwardable(&options, 0); if (opts->proxiable) krb5_get_init_creds_opt_set_proxiable(&options, 1); if (opts->not_proxiable) krb5_get_init_creds_opt_set_proxiable(&options, 0); if (opts->addresses) { krb5_address **addresses = NULL; code = krb5_os_localaddr(k5->ctx, &addresses); if (code != 0) { errmsg = error_message(code); syslog(LOG_ERR, dgettext(TEXT_DOMAIN, "k5_kinit: " "getting local addresses (%s)"), errmsg); goto cleanup; } krb5_get_init_creds_opt_set_address_list(&options, addresses); } if (opts->no_addresses) krb5_get_init_creds_opt_set_address_list(&options, NULL); if ((opts->action == INIT_KT) && opts->keytab_name) { code = krb5_kt_resolve(k5->ctx, opts->keytab_name, &keytab); if (code != 0) { errmsg = error_message(code); syslog(LOG_ERR, dgettext(TEXT_DOMAIN, "k5_kinit: " "resolving keytab %s (%s)"), errmsg, opts->keytab_name); goto cleanup; } } switch (opts->action) { case INIT_PW: code = krb5_get_init_creds_password(k5->ctx, &my_creds, k5->me, opts->principal_passwd, NULL, 0, opts->starttime, opts->service_name, &options); break; case INIT_KT: code = krb5_get_init_creds_keytab(k5->ctx, &my_creds, k5->me, keytab, opts->starttime, opts->service_name, &options); break; case VALIDATE: code = krb5_get_validated_creds(k5->ctx, &my_creds, k5->me, k5->cc, opts->service_name); break; case RENEW: code = krb5_get_renewed_creds(k5->ctx, &my_creds, k5->me, k5->cc, opts->service_name); break; } if (code) { char *doing = 0; switch (opts->action) { case INIT_PW: case INIT_KT: doing = dgettext(TEXT_DOMAIN, "k5_kinit: " "getting initial credentials"); break; case VALIDATE: doing = dgettext(TEXT_DOMAIN, "k5_kinit: " "validating credentials"); break; case RENEW: doing = dgettext(TEXT_DOMAIN, "k5_kinit: " "renewing credentials"); break; } /* * If got code == KRB5_AP_ERR_V4_REPLY && got_k4, we should * let the user know that maybe he/she wants -4. */ if (code == KRB5KRB_AP_ERR_V4_REPLY) { syslog(LOG_ERR, "%s\n" "The KDC doesn't support v5. " "You may want the -4 option in the future", doing); return (1); } else if (code == KRB5KRB_AP_ERR_BAD_INTEGRITY) { syslog(LOG_ERR, dgettext(TEXT_DOMAIN, "%s " "(Password incorrect)"), doing); } else { errmsg = error_message(code); syslog(LOG_ERR, dgettext(TEXT_DOMAIN, "%s (%s)"), doing, errmsg); } goto cleanup; } if (!opts->lifetime) { /* We need to figure out what lifetime to use for Kerberos 4. */ opts->lifetime = my_creds.times.endtime - my_creds.times.authtime; } code = krb5_cc_initialize(k5->ctx, k5->cc, k5->me); if (code) { errmsg = error_message(code); syslog(LOG_ERR, dgettext(TEXT_DOMAIN, "k5_kinit: " "initializing cache %s (%s)"), opts->k5_cache_name?opts->k5_cache_name:"", errmsg); goto cleanup; } code = krb5_cc_store_cred(k5->ctx, k5->cc, &my_creds); if (code) { errmsg = error_message(code); syslog(LOG_ERR, dgettext(TEXT_DOMAIN, "k5_kinit: " "storing credentials (%s)"), errmsg); goto cleanup; } notix = 0; cleanup: if (my_creds.client == k5->me) { my_creds.client = 0; } krb5_free_cred_contents(k5->ctx, &my_creds); if (keytab) krb5_kt_close(k5->ctx, keytab); return (notix?0:1); } int smb_kinit(char *user, char *passwd) { struct k_opts opts; struct k5_data k5; int authed_k5 = 0; assert(user); assert(passwd); (void) memset(&opts, 0, sizeof (opts)); opts.action = INIT_PW; opts.principal_name = user; opts.principal_passwd = passwd; (void) memset(&k5, 0, sizeof (k5)); if (k5_begin(&opts, &k5) != 0) { syslog(LOG_ERR, dgettext(TEXT_DOMAIN, "smb_kinit: " "NOT Authenticated to Kerberos v5 k5_begin failed\n")); return (0); } authed_k5 = k5_kinit(&opts, &k5); if (authed_k5) { syslog(LOG_DEBUG, dgettext(TEXT_DOMAIN, "smb_kinit: " "Authenticated to Kerberos v5\n")); } else { syslog(LOG_DEBUG, dgettext(TEXT_DOMAIN, "smb_kinit: " "NOT Authenticated to Kerberos v5\n")); } k5_end(&k5); return (authed_k5); } /* * krb5_display_stat * Display error message for GSS-API routines. * Parameters: * maj : GSS major status * min : GSS minor status * caller_mod: module name that calls this routine so that the module name * can be displayed with the error messages * Returns: * None */ static void krb5_display_stat(OM_uint32 maj, OM_uint32 min, char *caller_mod) { gss_buffer_desc msg; OM_uint32 msg_ctx = 0; OM_uint32 min2; (void) gss_display_status(&min2, maj, GSS_C_GSS_CODE, GSS_C_NULL_OID, &msg_ctx, &msg); syslog(LOG_ERR, "%s: major status error: %s\n", caller_mod, (char *)msg.value); (void) gss_release_buffer(&min2, &msg); (void) gss_display_status(&min2, min, GSS_C_MECH_CODE, GSS_C_NULL_OID, &msg_ctx, &msg); syslog(LOG_ERR, "%s: minor status error: %s\n", caller_mod, (char *)msg.value); (void) gss_release_buffer(&min2, &msg); } /* * krb5_acquire_cred_kinit * * Wrapper for krb5_acquire_cred_kinit_main with mutex to protect credential * cache file when calling krb5_acquire_cred or kinit. */ int krb5_acquire_cred_kinit(char *user, char *pwd, gss_cred_id_t *cred_handle, gss_OID *oid, int *kinit_retry, char *caller_mod) { int ret; ret = krb5_acquire_cred_kinit_main(user, pwd, cred_handle, oid, kinit_retry, caller_mod); return (ret); } /* * krb5_acquire_cred_kinit_main * * This routine is called by ADS module to get a handle to administrative * user's credential stored locally on the system. The credential is the TGT. * If the attempt at getting handle fails then a second attempt will be made * after getting a new TGT. * * If there's no username then we must be using host credentials and we don't * bother trying to acquire a credential for GSS_C_NO_NAME (which should be * equivalent to using GSS_C_NO_CREDENTIAL, but it isn't in a very subtle way * because mech_krb5 isn't so smart). Specifically mech_krb5 will try hard * to get a non-expired TGT using the keytab if we're running as root (or fake * it, using the special app_krb5_user_uid() function), but only when we use * the default credential, as opposed to a credential for the default principal. * * Paramters: * user : username to retrieve a handle to its credential * pwd : password of username in case obtaining a new TGT is needed * kinit_retry: if 0 then a second attempt will be made to get handle to the * credential if the first attempt fails * caller_mod : name of module that call this routine so that the module name * can be included with error messages * Returns: * cred_handle: handle to the administrative user's credential (TGT) * oid : contains Kerberos 5 object identifier * kinit_retry: A 1 indicates that a second attempt has been made to get * handle to the credential and no further attempts can be made * -1 : error * 0 : success */ static int krb5_acquire_cred_kinit_main(char *user, char *pwd, gss_cred_id_t *cred_handle, gss_OID *oid, int *kinit_retry, char *caller_mod) { OM_uint32 maj, min; gss_name_t desired_name = GSS_C_NO_NAME; gss_OID_set desired_mechs; gss_buffer_desc oidstr, name_buf; char str[50], user_name[50]; *cred_handle = GSS_C_NO_CREDENTIAL; *oid = GSS_C_NO_OID; if (user == NULL || *user == '\0') return (0); /* Object Identifier for Kerberos 5 */ (void) strcpy(str, "{ 1 2 840 113554 1 2 2 }"); oidstr.value = str; oidstr.length = strlen(str); if ((maj = gss_str_to_oid(&min, &oidstr, oid)) != GSS_S_COMPLETE) { krb5_display_stat(maj, min, caller_mod); return (-1); } if ((maj = gss_create_empty_oid_set(&min, &desired_mechs)) != GSS_S_COMPLETE) { krb5_display_stat(maj, min, caller_mod); (void) gss_release_oid(&min, oid); return (-1); } if ((maj = gss_add_oid_set_member(&min, *oid, &desired_mechs)) != GSS_S_COMPLETE) { krb5_display_stat(maj, min, caller_mod); (void) gss_release_oid(&min, oid); (void) gss_release_oid_set(&min, &desired_mechs); return (-1); } (void) strcpy(user_name, user); name_buf.value = user_name; name_buf.length = strlen(user_name)+1; if ((maj = gss_import_name(&min, &name_buf, GSS_C_NT_USER_NAME, &desired_name)) != GSS_S_COMPLETE) { krb5_display_stat(maj, min, caller_mod); (void) gss_release_oid(&min, oid); (void) gss_release_oid_set(&min, &desired_mechs); return (-1); } acquire_cred: if ((maj = gss_acquire_cred(&min, desired_name, 0, desired_mechs, GSS_C_INITIATE, cred_handle, NULL, NULL)) != GSS_S_COMPLETE) { if (!*kinit_retry && pwd != NULL && *pwd != '\0') { syslog(LOG_ERR, "%s: Retry kinit to " "acquire credential.\n", caller_mod); (void) smb_kinit(user, pwd); *kinit_retry = 1; goto acquire_cred; } else { krb5_display_stat(maj, min, caller_mod); (void) gss_release_oid(&min, oid); (void) gss_release_oid_set(&min, &desired_mechs); (void) gss_release_name(&min, &desired_name); if (pwd == NULL || *pwd == '\0') { /* See above */ *cred_handle = GSS_C_NO_CREDENTIAL; return (0); } return (-1); } } (void) gss_release_oid_set(&min, &desired_mechs); (void) gss_release_name(&min, &desired_name); return (0); } /* * krb5_establish_sec_ctx_kinit * * This routine is called by the ADS module to establish a security * context before ADS updates are allowed. If establishing a security context * fails for any reason, a second attempt will be made after a new TGT is * obtained. This routine is called many time as needed until a security * context is established. * * The resources use for the security context must be released if security * context establishment process fails. * Parameters: * user : user used in establishing a security context for. Is used for * obtaining a new TGT for a second attempt at establishing * security context * pwd : password of above user * cred_handle: a handle to the user credential (TGT) stored locally * gss_context: initially set to GSS_C_NO_CONTEXT but will contain a handle * to a security context * target_name: contains service name to establish a security context with, * ie ldap or dns * gss_flags : flags used in establishing security context * inputptr : initially set to GSS_C_NO_BUFFER but will be token data * received from service's server to be processed to generate * further token to be sent back to service's server during * security context establishment * kinit_retry: if 0 then a second attempt will be made to get handle to the * credential if the first attempt fails * caller_mod : name of module that call this routine so that the module name * can be included with error messages * Returns: * gss_context : a handle to a security context * out_tok : token data to be sent to service's server to establish * security context * ret_flags : return flags * time_rec : valid time for security context, not currently used * kinit_retry : A 1 indicates that a second attempt has been made to get * handle to the credential and no further attempts can be * made * do_acquire_cred: A 1 indicates that a new handle to the local credential * is needed for second attempt at security context * establishment * maj : major status code used if determining is security context * establishment is successful */ int krb5_establish_sec_ctx_kinit(char *user, char *pwd, gss_cred_id_t cred_handle, gss_ctx_id_t *gss_context, gss_name_t target_name, gss_OID oid, int gss_flags, gss_buffer_desc *inputptr, gss_buffer_desc* out_tok, OM_uint32 *ret_flags, OM_uint32 *time_rec, int *kinit_retry, int *do_acquire_cred, OM_uint32 *maj, char *caller_mod) { OM_uint32 min; *maj = gss_init_sec_context(&min, cred_handle, gss_context, target_name, oid, gss_flags, 0, NULL, inputptr, NULL, out_tok, ret_flags, time_rec); if (*maj != GSS_S_COMPLETE && *maj != GSS_S_CONTINUE_NEEDED) { if (*gss_context != NULL) (void) gss_delete_sec_context(&min, gss_context, NULL); if ((user != NULL) && (pwd != NULL) && !*kinit_retry) { syslog(LOG_ERR, "%s: Retry kinit to establish " "security context.\n", caller_mod); (void) smb_kinit(user, pwd); *kinit_retry = 1; *do_acquire_cred = 1; return (-1); } else { krb5_display_stat(*maj, min, caller_mod); return (-1); } } return (0); } /* * smb_ccache_init * * Creates the directory where the Kerberos ccache file is located * and set KRB5CCNAME in the environment. * * Returns 0 upon succcess. Otherwise, returns * -1 if it fails to create the specified directory fails. * -2 if it fails to set the KRB5CCNAME environment variable. */ int smb_ccache_init(char *dir, char *filename) { static char buf[MAXPATHLEN]; if ((mkdir(dir, 0700) < 0) && (errno != EEXIST)) return (-1); (void) snprintf(buf, MAXPATHLEN, "KRB5CCNAME=%s/%s", dir, filename); if (putenv(buf) != 0) return (-2); return (0); } void smb_ccache_remove(char *path) { if ((remove(path) < 0) && (errno != ENOENT)) syslog(LOG_ERR, "failed to remove ccache (%s)", path); }