Copyright (C) Remus Koos 2001
Copyright (C) Nalin Dahyabhai <nalin@redhat.com> 2004.
Copyright (C) Jeremy Allison 2004.
+ Copyright (C) Gerald Carter 2006.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
memset(prompts[0].reply->data, '\0', prompts[0].reply->length);
if (prompts[0].reply->length > 0) {
if (data) {
- strncpy(prompts[0].reply->data, data, prompts[0].reply->length-1);
+ strncpy(prompts[0].reply->data, (const char *)data,
+ prompts[0].reply->length-1);
prompts[0].reply->length = strlen(prompts[0].reply->data);
} else {
prompts[0].reply->length = 0;
return 0;
}
+static BOOL smb_krb5_err_io_nstatus(TALLOC_CTX *mem_ctx,
+ DATA_BLOB *edata_blob,
+ KRB5_EDATA_NTSTATUS *edata)
+{
+ BOOL ret = False;
+ prs_struct ps;
+
+ if (!mem_ctx || !edata_blob || !edata)
+ return False;
+
+ if (!prs_init(&ps, edata_blob->length, mem_ctx, UNMARSHALL))
+ return False;
+
+ if (!prs_copy_data_in(&ps, (char *)edata_blob->data, edata_blob->length))
+ goto out;
+
+ prs_set_offset(&ps, 0);
+
+ if (!prs_ntstatus("ntstatus", &ps, 1, &edata->ntstatus))
+ goto out;
+
+ if (!prs_uint32("unknown1", &ps, 1, &edata->unknown1))
+ goto out;
+
+ if (!prs_uint32("unknown2", &ps, 1, &edata->unknown2)) /* only seen 00000001 here */
+ goto out;
+
+ ret = True;
+ out:
+ prs_mem_free(&ps);
+
+ return ret;
+}
+
+ static BOOL smb_krb5_get_ntstatus_from_krb5_error(krb5_error *error,
+ NTSTATUS *nt_status)
+{
+ DATA_BLOB edata;
+ DATA_BLOB unwrapped_edata;
+ TALLOC_CTX *mem_ctx;
+ KRB5_EDATA_NTSTATUS parsed_edata;
+
+#ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR
+ edata = data_blob(error->e_data->data, error->e_data->length);
+#else
+ edata = data_blob(error->e_data.data, error->e_data.length);
+#endif /* HAVE_E_DATA_POINTER_IN_KRB5_ERROR */
+
+#ifdef DEVELOPER
+ dump_data(10, edata.data, edata.length);
+#endif /* DEVELOPER */
+
+ mem_ctx = talloc_init("smb_krb5_get_ntstatus_from_krb5_error");
+ if (mem_ctx == NULL) {
+ data_blob_free(&edata);
+ return False;
+ }
+
+ if (!unwrap_edata_ntstatus(mem_ctx, &edata, &unwrapped_edata)) {
+ data_blob_free(&edata);
+ TALLOC_FREE(mem_ctx);
+ return False;
+ }
+
+ data_blob_free(&edata);
+
+ if (!smb_krb5_err_io_nstatus(mem_ctx, &unwrapped_edata, &parsed_edata)) {
+ data_blob_free(&unwrapped_edata);
+ TALLOC_FREE(mem_ctx);
+ return False;
+ }
+
+ data_blob_free(&unwrapped_edata);
+
+ if (nt_status) {
+ *nt_status = parsed_edata.ntstatus;
+ }
+
+ TALLOC_FREE(mem_ctx);
+
+ return True;
+}
+
+ static BOOL smb_krb5_get_ntstatus_from_krb5_error_init_creds_opt(krb5_context ctx,
+ krb5_get_init_creds_opt *opt,
+ NTSTATUS *nt_status)
+{
+ BOOL ret = False;
+ krb5_error *error = NULL;
+
+#ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_GET_ERROR
+ ret = krb5_get_init_creds_opt_get_error(ctx, opt, &error);
+ if (ret) {
+ DEBUG(1,("krb5_get_init_creds_opt_get_error gave: %s\n",
+ error_message(ret)));
+ return False;
+ }
+#endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_GET_ERROR */
+
+ if (!error) {
+ DEBUG(1,("no krb5_error\n"));
+ return False;
+ }
+
+#ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR
+ if (!error->e_data) {
+#else
+ if (error->e_data.data == NULL) {
+#endif /* HAVE_E_DATA_POINTER_IN_KRB5_ERROR */
+ DEBUG(1,("no edata in krb5_error\n"));
+ krb5_free_error(ctx, error);
+ return False;
+ }
+
+ ret = smb_krb5_get_ntstatus_from_krb5_error(error, nt_status);
+
+ krb5_free_error(ctx, error);
+
+ return ret;
+}
+
/*
simulate a kinit, putting the tgt in the given cache location. If cache_name == NULL
place in default cache location.
const char *cache_name,
BOOL request_pac,
BOOL add_netbios_addr,
- time_t renewable_time)
+ time_t renewable_time,
+ NTSTATUS *ntstatus)
{
krb5_context ctx = NULL;
krb5_error_code code = 0;
krb5_ccache cc = NULL;
- krb5_principal me;
+ krb5_principal me = NULL;
krb5_creds my_creds;
- krb5_get_init_creds_opt opt;
+ krb5_get_init_creds_opt *opt = NULL;
smb_krb5_addresses *addr = NULL;
+ ZERO_STRUCT(my_creds);
+
initialize_krb5_error_table();
if ((code = krb5_init_context(&ctx)))
- return code;
+ goto out;
if (time_offset != 0) {
krb5_set_real_time(ctx, time(NULL) + time_offset, 0);
}
- DEBUG(10,("kerberos_kinit_password: using %s as ccache\n",
- cache_name ? cache_name: krb5_cc_default_name(ctx)));
+ DEBUG(10,("kerberos_kinit_password: using [%s] as ccache and config [%s]\n",
+ cache_name ? cache_name: krb5_cc_default_name(ctx),
+ getenv("KRB5_CONFIG")));
if ((code = krb5_cc_resolve(ctx, cache_name ? cache_name : krb5_cc_default_name(ctx), &cc))) {
- krb5_free_context(ctx);
- return code;
+ goto out;
}
if ((code = smb_krb5_parse_name(ctx, principal, &me))) {
- krb5_free_context(ctx);
- return code;
+ goto out;
}
- krb5_get_init_creds_opt_init(&opt);
- krb5_get_init_creds_opt_set_renew_life(&opt, renewable_time);
- krb5_get_init_creds_opt_set_forwardable(&opt, 1);
-
- if (request_pac) {
+ if ((code = smb_krb5_get_init_creds_opt_alloc(ctx, &opt))) {
+ goto out;
+ }
+
+ krb5_get_init_creds_opt_set_renew_life(opt, renewable_time);
+ krb5_get_init_creds_opt_set_forwardable(opt, True);
+#if 0
+ /* insane testing */
+ krb5_get_init_creds_opt_set_tkt_life(opt, 60);
+#endif
+
#ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_SET_PAC_REQUEST
- code = krb5_get_init_creds_opt_set_pac_request(ctx, &opt, True);
- if (code) {
- krb5_free_principal(ctx, me);
- krb5_free_context(ctx);
- return code;
+ if (request_pac) {
+ if ((code = krb5_get_init_creds_opt_set_pac_request(ctx, opt, (krb5_boolean)request_pac))) {
+ goto out;
}
-#endif
}
-
+#endif
if (add_netbios_addr) {
- code = smb_krb5_gen_netbios_krb5_address(&addr);
- if (code) {
- krb5_free_principal(ctx, me);
- krb5_free_context(ctx);
- return code;
+ if ((code = smb_krb5_gen_netbios_krb5_address(&addr))) {
+ goto out;
}
- krb5_get_init_creds_opt_set_address_list(&opt, addr->addrs);
+ krb5_get_init_creds_opt_set_address_list(opt, addr->addrs);
}
if ((code = krb5_get_init_creds_password(ctx, &my_creds, me, CONST_DISCARD(char *,password),
- kerb_prompter, NULL, 0, NULL, &opt)))
- {
- smb_krb5_free_addresses(ctx, addr);
- krb5_free_principal(ctx, me);
- krb5_free_context(ctx);
- return code;
+ kerb_prompter, CONST_DISCARD(char *,password),
+ 0, NULL, opt))) {
+ goto out;
}
-
+
if ((code = krb5_cc_initialize(ctx, cc, me))) {
- smb_krb5_free_addresses(ctx, addr);
- krb5_free_cred_contents(ctx, &my_creds);
- krb5_free_principal(ctx, me);
- krb5_free_context(ctx);
- return code;
+ goto out;
}
if ((code = krb5_cc_store_cred(ctx, cc, &my_creds))) {
- krb5_cc_close(ctx, cc);
- smb_krb5_free_addresses(ctx, addr);
- krb5_free_cred_contents(ctx, &my_creds);
- krb5_free_principal(ctx, me);
- krb5_free_context(ctx);
- return code;
+ goto out;
}
if (expire_time) {
if (renew_till_time) {
*renew_till_time = (time_t) my_creds.times.renew_till;
}
+ out:
+ if (ntstatus) {
- krb5_cc_close(ctx, cc);
- smb_krb5_free_addresses(ctx, addr);
+ NTSTATUS status;
+
+ /* fast path */
+ if (code == 0) {
+ *ntstatus = NT_STATUS_OK;
+ goto cleanup;
+ }
+
+ /* try to get ntstatus code out of krb5_error when we have it
+ * inside the krb5_get_init_creds_opt - gd */
+
+ if (opt && smb_krb5_get_ntstatus_from_krb5_error_init_creds_opt(ctx, opt, &status)) {
+ *ntstatus = status;
+ goto cleanup;
+ }
+
+ /* fall back to self-made-mapping */
+ *ntstatus = krb5_to_nt_status(code);
+ }
+
+ cleanup:
krb5_free_cred_contents(ctx, &my_creds);
- krb5_free_principal(ctx, me);
- krb5_free_context(ctx);
-
- return 0;
+ if (me) {
+ krb5_free_principal(ctx, me);
+ }
+ if (addr) {
+ smb_krb5_free_addresses(ctx, addr);
+ }
+ if (opt) {
+ smb_krb5_get_init_creds_opt_free(ctx, opt);
+ }
+ if (cc) {
+ krb5_cc_close(ctx, cc);
+ }
+ if (ctx) {
+ krb5_free_context(ctx);
+ }
+ return code;
}
}
if (!ads->auth.password) {
+ SAFE_FREE(s);
return KRB5_LIBOS_CANTREADPWD;
}
ret = kerberos_kinit_password_ext(s, ads->auth.password, ads->auth.time_offset,
- &ads->auth.expire, NULL, NULL, False, False, ads->auth.renewable);
+ &ads->auth.tgt_expire, NULL, NULL, False, False, ads->auth.renewable,
+ NULL);
if (ret) {
DEBUG(0,("kerberos_kinit_password %s failed: %s\n",
s, error_message(ret)));
}
- free(s);
+ SAFE_FREE(s);
return ret;
}
}
/************************************************************************
- Routine to get the salting principal for this service. Active
- Directory may use a non-obvious principal name to generate the salt
- when it determines the key to use for encrypting tickets for a service,
- and hopefully we detected that when we joined the domain.
- Caller must free if return is not null.
+ Return the standard DES salt key
+************************************************************************/
+
+char* kerberos_standard_des_salt( void )
+{
+ fstring salt;
+
+ fstr_sprintf( salt, "host/%s.%s@", global_myname(), lp_realm() );
+ strlower_m( salt );
+ fstrcat( salt, lp_realm() );
+
+ return SMB_STRDUP( salt );
+}
+
+/************************************************************************
+************************************************************************/
+
+static char* des_salt_key( void )
+{
+ char *key;
+
+ asprintf(&key, "%s/DES/%s", SECRETS_SALTING_PRINCIPAL, lp_realm());
+
+ return key;
+}
+
+/************************************************************************
+************************************************************************/
+
+BOOL kerberos_secrets_store_des_salt( const char* salt )
+{
+ char* key;
+ BOOL ret;
+
+ if ( (key = des_salt_key()) == NULL ) {
+ DEBUG(0,("kerberos_secrets_store_des_salt: failed to generate key!\n"));
+ return False;
+ }
+
+ if ( !salt ) {
+ DEBUG(8,("kerberos_secrets_store_des_salt: deleting salt\n"));
+ secrets_delete( key );
+ return True;
+ }
+
+ DEBUG(3,("kerberos_secrets_store_des_salt: Storing salt \"%s\"\n", salt));
+
+ ret = secrets_store( key, salt, strlen(salt)+1 );
+
+ SAFE_FREE( key );
+
+ return ret;
+}
+
+/************************************************************************
+************************************************************************/
+
+char* kerberos_secrets_fetch_des_salt( void )
+{
+ char *salt, *key;
+
+ if ( (key = des_salt_key()) == NULL ) {
+ DEBUG(0,("kerberos_secrets_fetch_des_salt: failed to generate key!\n"));
+ return False;
+ }
+
+ salt = (char*)secrets_fetch( key, NULL );
+
+ SAFE_FREE( key );
+
+ return salt;
+}
+
+
+/************************************************************************
+ Routine to get the salting principal for this service. This is
+ maintained for backwards compatibilty with releases prior to 3.0.24.
+ Since we store the salting principal string only at join, we may have
+ to look for the older tdb keys. Caller must free if return is not null.
************************************************************************/
krb5_principal kerberos_fetch_salt_princ_for_host_princ(krb5_context context,
{
char *unparsed_name = NULL, *salt_princ_s = NULL;
krb5_principal ret_princ = NULL;
+
+ /* lookup new key first */
- if (smb_krb5_unparse_name(context, host_princ, &unparsed_name) != 0) {
- return (krb5_principal)NULL;
- }
+ if ( (salt_princ_s = kerberos_secrets_fetch_des_salt()) == NULL ) {
+
+ /* look under the old key. If this fails, just use the standard key */
- if ((salt_princ_s = kerberos_secrets_fetch_salting_principal(unparsed_name, enctype)) == NULL) {
- SAFE_FREE(unparsed_name);
- return (krb5_principal)NULL;
+ if (smb_krb5_unparse_name(context, host_princ, &unparsed_name) != 0) {
+ return (krb5_principal)NULL;
+ }
+ if ((salt_princ_s = kerberos_secrets_fetch_salting_principal(unparsed_name, enctype)) == NULL) {
+ /* fall back to host/machine.realm@REALM */
+ salt_princ_s = kerberos_standard_des_salt();
+ }
}
if (smb_krb5_parse_name(context, salt_princ_s, &ret_princ) != 0) {
- SAFE_FREE(unparsed_name);
- SAFE_FREE(salt_princ_s);
- return (krb5_principal)NULL;
+ ret_princ = NULL;
}
+
SAFE_FREE(unparsed_name);
SAFE_FREE(salt_princ_s);
+
return ret_princ;
}
return ret;
}
+
/************************************************************************
- Routine to get initial credentials as a service ticket for the local machine.
- Returns a buffer initialized with krb5_mk_req_extended.
- ************************************************************************/
+************************************************************************/
-static krb5_error_code get_service_ticket(krb5_context ctx,
- krb5_ccache ccache,
- const char *service_principal,
- int enctype,
- krb5_data *p_outbuf)
+int kerberos_kinit_password(const char *principal,
+ const char *password,
+ int time_offset,
+ const char *cache_name)
{
- krb5_creds creds, *new_creds = NULL;
- char *service_s = NULL;
- char *machine_account = NULL, *password = NULL;
- krb5_data in_data;
- krb5_auth_context auth_context = NULL;
- krb5_error_code err = 0;
-
- ZERO_STRUCT(creds);
-
- asprintf(&machine_account, "%s$@%s", global_myname(), lp_realm());
- if (machine_account == NULL) {
- goto out;
- }
- password = secrets_fetch_machine_password(lp_workgroup(), NULL, NULL);
- if (password == NULL) {
- goto out;
- }
- if ((err = kerberos_kinit_password(machine_account, password,
- 0, LIBADS_CCACHE_NAME)) != 0) {
- DEBUG(0,("get_service_ticket: kerberos_kinit_password %s failed: %s\n",
- machine_account,
- error_message(err)));
- goto out;
- }
-
- /* Ok - the above call has gotten a TGT. Now we need to get a service
- ticket to ourselves. */
-
- /* Set up the enctype and client and server principal fields for krb5_get_credentials. */
- kerberos_set_creds_enctype(&creds, enctype);
+ return kerberos_kinit_password_ext(principal,
+ password,
+ time_offset,
+ 0,
+ 0,
+ cache_name,
+ False,
+ False,
+ 0,
+ NULL);
+}
- if ((err = krb5_cc_get_principal(ctx, ccache, &creds.client))) {
- DEBUG(3, ("get_service_ticket: krb5_cc_get_principal failed: %s\n",
- error_message(err)));
- goto out;
- }
+/************************************************************************
+ Create a string list of available kdc's, possibly searching by sitename.
+ Does DNS queries.
+************************************************************************/
- if (strchr_m(service_principal, '@')) {
- asprintf(&service_s, "%s", service_principal);
- } else {
- asprintf(&service_s, "%s@%s", service_principal, lp_realm());
- }
+static char *get_kdc_ip_string(char *mem_ctx, const char *realm, const char *sitename, struct in_addr primary_ip)
+{
+ struct ip_service *ip_srv_site;
+ struct ip_service *ip_srv_nonsite;
+ int count_site, count_nonsite, i;
+ char *kdc_str = talloc_asprintf(mem_ctx, "\tkdc = %s\n",
+ inet_ntoa(primary_ip));
- if ((err = smb_krb5_parse_name(ctx, service_s, &creds.server))) {
- DEBUG(0,("get_service_ticket: smb_krb5_parse_name %s failed: %s\n",
- service_s, error_message(err)));
- goto out;
+ if (kdc_str == NULL) {
+ return NULL;
}
- if ((err = krb5_get_credentials(ctx, 0, ccache, &creds, &new_creds))) {
- DEBUG(5,("get_service_ticket: krb5_get_credentials for %s enctype %d failed: %s\n",
- service_s, enctype, error_message(err)));
- goto out;
- }
+ /* Get the KDC's only in this site. */
- memset(&in_data, '\0', sizeof(in_data));
- if ((err = krb5_mk_req_extended(ctx, &auth_context, 0, &in_data,
- new_creds, p_outbuf)) != 0) {
- DEBUG(0,("get_service_ticket: krb5_mk_req_extended failed: %s\n",
- error_message(err)));
- goto out;
- }
+ if (sitename) {
- out:
+ get_kdc_list(realm, sitename, &ip_srv_site, &count_site);
- if (auth_context) {
- krb5_auth_con_free(ctx, auth_context);
- }
- if (new_creds) {
- krb5_free_creds(ctx, new_creds);
- }
- if (creds.server) {
- krb5_free_principal(ctx, creds.server);
- }
- if (creds.client) {
- krb5_free_principal(ctx, creds.client);
+ for (i = 0; i < count_site; i++) {
+ if (ip_equal(ip_srv_site[i].ip, primary_ip)) {
+ continue;
+ }
+ /* Append to the string - inefficient but not done often. */
+ kdc_str = talloc_asprintf(mem_ctx, "%s\tkdc = %s\n",
+ kdc_str, inet_ntoa(ip_srv_site[i].ip));
+ if (!kdc_str) {
+ SAFE_FREE(ip_srv_site);
+ return NULL;
+ }
+ }
}
- SAFE_FREE(service_s);
- SAFE_FREE(password);
- SAFE_FREE(machine_account);
- return err;
-}
-
-/************************************************************************
- Check if the machine password can be used in conjunction with the salting_principal
- to generate a key which will successfully decrypt the AP_REQ already
- gotten as a message to the local machine.
- ************************************************************************/
+ /* Get all KDC's. */
-static BOOL verify_service_password(krb5_context ctx,
- int enctype,
- const char *salting_principal,
- krb5_data *in_data)
-{
- BOOL ret = False;
- krb5_principal salting_kprinc = NULL;
- krb5_ticket *ticket = NULL;
- krb5_keyblock key;
- krb5_data passdata;
- char *salting_s = NULL;
- char *machine_account = NULL, *password = NULL;
- krb5_auth_context auth_context = NULL;
- krb5_error_code err;
-
- memset(&passdata, '\0', sizeof(passdata));
- memset(&key, '\0', sizeof(key));
-
- asprintf(&machine_account, "%s$@%s", global_myname(), lp_realm());
- if (machine_account == NULL) {
- goto out;
- }
- password = secrets_fetch_machine_password(lp_workgroup(), NULL, NULL);
- if (password == NULL) {
- goto out;
- }
+ get_kdc_list(realm, NULL, &ip_srv_nonsite, &count_nonsite);
- if (strchr_m(salting_principal, '@')) {
- asprintf(&salting_s, "%s", salting_principal);
- } else {
- asprintf(&salting_s, "%s@%s", salting_principal, lp_realm());
- }
+ for (i = 0; i < count_nonsite; i++) {
+ int j;
- if ((err = smb_krb5_parse_name(ctx, salting_s, &salting_kprinc))) {
- DEBUG(0,("verify_service_password: smb_krb5_parse_name %s failed: %s\n",
- salting_s, error_message(err)));
- goto out;
- }
+ if (ip_equal(ip_srv_nonsite[i].ip, primary_ip)) {
+ continue;
+ }
- passdata.length = strlen(password);
- passdata.data = (char*)password;
- if ((err = create_kerberos_key_from_string_direct(ctx, salting_kprinc, &passdata, &key, enctype))) {
- DEBUG(0,("verify_service_password: create_kerberos_key_from_string %d failed: %s\n",
- enctype, error_message(err)));
- goto out;
- }
+ /* Ensure this isn't an IP already seen (YUK! this is n*n....) */
+ for (j = 0; j < count_site; j++) {
+ if (ip_equal(ip_srv_nonsite[i].ip, ip_srv_site[j].ip)) {
+ break;
+ }
+ /* As the lists are sorted we can break early if nonsite > site. */
+ if (ip_service_compare(&ip_srv_nonsite[i], &ip_srv_site[j]) > 0) {
+ break;
+ }
+ }
+ if (j != i) {
+ continue;
+ }
- if ((err = krb5_auth_con_init(ctx, &auth_context)) != 0) {
- DEBUG(0,("verify_service_password: krb5_auth_con_init failed %s\n", error_message(err)));
- goto out;
+ /* Append to the string - inefficient but not done often. */
+ kdc_str = talloc_asprintf(mem_ctx, "%s\tkdc = %s\n",
+ kdc_str, inet_ntoa(ip_srv_nonsite[i].ip));
+ if (!kdc_str) {
+ SAFE_FREE(ip_srv_site);
+ SAFE_FREE(ip_srv_nonsite);
+ return NULL;
+ }
}
- if ((err = krb5_auth_con_setuseruserkey(ctx, auth_context, &key)) != 0) {
- DEBUG(0,("verify_service_password: krb5_auth_con_setuseruserkey failed %s\n", error_message(err)));
- goto out;
- }
- if (!(err = krb5_rd_req(ctx, &auth_context, in_data, NULL, NULL, NULL, &ticket))) {
- DEBUG(10,("verify_service_password: decrypted message with enctype %u salt %s!\n",
- (unsigned int)enctype, salting_s));
- ret = True;
- }
+ SAFE_FREE(ip_srv_site);
+ SAFE_FREE(ip_srv_nonsite);
- out:
+ DEBUG(10,("get_kdc_ip_string: Returning %s\n",
+ kdc_str ));
- memset(&passdata, 0, sizeof(passdata));
- krb5_free_keyblock_contents(ctx, &key);
- if (ticket != NULL) {
- krb5_free_ticket(ctx, ticket);
- }
- if (salting_kprinc) {
- krb5_free_principal(ctx, salting_kprinc);
- }
- SAFE_FREE(salting_s);
- SAFE_FREE(password);
- SAFE_FREE(machine_account);
- return ret;
+ return kdc_str;
}
/************************************************************************
- *
- * From the current draft of kerberos-clarifications:
- *
- * It is not possible to reliably generate a user's key given a pass
- * phrase without contacting the KDC, since it will not be known
- * whether alternate salt or parameter values are required.
- *
- * And because our server has a password, we have this exact problem. We
- * make multiple guesses as to which principal name provides the salt which
- * the KDC is using.
- *
- ************************************************************************/
-
-static void kerberos_derive_salting_principal_for_enctype(const char *service_principal,
- krb5_context ctx,
- krb5_ccache ccache,
- krb5_enctype enctype,
- krb5_enctype *enctypes)
+ Create a specific krb5.conf file in the private directory pointing
+ at a specific kdc for a realm. Keyed off domain name. Sets
+ KRB5_CONFIG environment variable to point to this file. Must be
+ run as root or will fail (which is a good thing :-).
+************************************************************************/
+
+BOOL create_local_private_krb5_conf_for_domain(const char *realm, const char *domain,
+ const char *sitename, struct in_addr ip)
{
- char *salting_principals[3] = {NULL, NULL, NULL}, *second_principal = NULL;
- krb5_error_code err = 0;
- krb5_data outbuf;
- int i, j;
-
- memset(&outbuf, '\0', sizeof(outbuf));
-
- /* Check that the service_principal is useful. */
- if ((service_principal == NULL) || (strlen(service_principal) == 0)) {
- return;
+ char *dname = talloc_asprintf(NULL, "%s/smb_krb5", lp_lockdir());
+ char *tmpname = NULL;
+ char *fname = NULL;
+ char *file_contents = NULL;
+ char *kdc_ip_string = NULL;
+ size_t flen = 0;
+ ssize_t ret;
+ int fd;
+ char *realm_upper = NULL;
+
+ if (!dname) {
+ return False;
}
-
- /* Generate our first guess -- the principal as-given. */
- asprintf(&salting_principals[0], "%s", service_principal);
- if ((salting_principals[0] == NULL) || (strlen(salting_principals[0]) == 0)) {
- return;
+ if ((mkdir(dname, 0755)==-1) && (errno != EEXIST)) {
+ DEBUG(0,("create_local_private_krb5_conf_for_domain: "
+ "failed to create directory %s. Error was %s\n",
+ dname, strerror(errno) ));
+ TALLOC_FREE(dname);
+ return False;
}
- /* Generate our second guess -- the computer's principal, as Win2k3. */
- asprintf(&second_principal, "host/%s.%s", global_myname(), lp_realm());
- if (second_principal != NULL) {
- strlower_m(second_principal);
- asprintf(&salting_principals[1], "%s@%s", second_principal, lp_realm());
- SAFE_FREE(second_principal);
- }
- if ((salting_principals[1] == NULL) || (strlen(salting_principals[1]) == 0)) {
- goto out;
+ tmpname = talloc_asprintf(dname, "%s/smb_tmp_krb5.XXXXXX", lp_lockdir());
+ if (!tmpname) {
+ TALLOC_FREE(dname);
+ return False;
}
- /* Generate our third guess -- the computer's principal, as Win2k. */
- asprintf(&second_principal, "HOST/%s", global_myname());
- if (second_principal != NULL) {
- strlower_m(second_principal + 5);
- asprintf(&salting_principals[2], "%s@%s",
- second_principal, lp_realm());
- SAFE_FREE(second_principal);
- }
- if ((salting_principals[2] == NULL) || (strlen(salting_principals[2]) == 0)) {
- goto out;
+ fname = talloc_asprintf(dname, "%s/krb5.conf.%s", dname, domain);
+ if (!fname) {
+ TALLOC_FREE(dname);
+ return False;
}
- /* Get a service ticket for ourselves into our memory ccache. */
- /* This will commonly fail if there is no principal by that name (and we're trying
- many names). So don't print a debug 0 error. */
-
- if ((err = get_service_ticket(ctx, ccache, service_principal, enctype, &outbuf)) != 0) {
- DEBUG(3, ("verify_service_password: get_service_ticket failed: %s\n",
- error_message(err)));
- goto out;
- }
+ DEBUG(10,("create_local_private_krb5_conf_for_domain: fname = %s, realm = %s, domain = %s\n",
+ fname, realm, domain ));
- /* At this point we have a message to ourselves, salted only the KDC knows how. We
- have to work out what that salting is. */
+ realm_upper = talloc_strdup(fname, realm);
+ strupper_m(realm_upper);
- /* Try and find the correct salting principal. */
- for (i = 0; i < sizeof(salting_principals) / sizeof(salting_principals[i]); i++) {
- if (verify_service_password(ctx, enctype, salting_principals[i], &outbuf)) {
- break;
- }
+ kdc_ip_string = get_kdc_ip_string(dname, realm, sitename, ip);
+ if (!kdc_ip_string) {
+ TALLOC_FREE(dname);
+ return False;
}
+
+ file_contents = talloc_asprintf(fname, "[libdefaults]\n\tdefault_realm = %s\n\n"
+ "[realms]\n\t%s = {\n"
+ "\t%s\t}\n",
+ realm_upper, realm_upper, kdc_ip_string);
- /* If we failed to get a match, return. */
- if (i >= sizeof(salting_principals) / sizeof(salting_principals[i])) {
- goto out;
+ if (!file_contents) {
+ TALLOC_FREE(dname);
+ return False;
}
- /* If we succeeded, store the principal for use for all enctypes which
- * share the same cipher and string-to-key function. Doing this here
- * allows servers which just pass a keytab to krb5_rd_req() to work
- * correctly. */
- for (j = 0; enctypes[j] != 0; j++) {
- if (enctype != enctypes[j]) {
- /* If this enctype isn't compatible with the one which
- * we used, skip it. */
+ flen = strlen(file_contents);
- if (!kerberos_compatible_enctypes(ctx, enctypes[j], enctype))
- continue;
- }
- /* If the principal which gives us the proper salt is the one
- * which we would normally guess, don't bother noting anything
- * in the secrets tdb. */
- if (strcmp(service_principal, salting_principals[i]) != 0) {
- kerberos_secrets_store_salting_principal(service_principal,
- enctypes[j],
- salting_principals[i]);
- }
+ fd = smb_mkstemp(tmpname);
+ if (fd == -1) {
+ DEBUG(0,("create_local_private_krb5_conf_for_domain: smb_mkstemp failed,"
+ " for file %s. Errno %s\n",
+ tmpname, strerror(errno) ));
}
- out :
-
- kerberos_free_data_contents(ctx, &outbuf);
- SAFE_FREE(salting_principals[0]);
- SAFE_FREE(salting_principals[1]);
- SAFE_FREE(salting_principals[2]);
- SAFE_FREE(second_principal);
-}
-
-/************************************************************************
- Go through all the possible enctypes for this principal.
- ************************************************************************/
-
-static void kerberos_derive_salting_principal_direct(krb5_context context,
- krb5_ccache ccache,
- krb5_enctype *enctypes,
- char *service_principal)
-{
- int i;
-
- /* Try for each enctype separately, because the rules are
- * different for different enctypes. */
- for (i = 0; enctypes[i] != 0; i++) {
- /* Delete secrets entry first. */
- kerberos_secrets_store_salting_principal(service_principal, 0, NULL);
-#ifdef ENCTYPE_ARCFOUR_HMAC
- if (enctypes[i] == ENCTYPE_ARCFOUR_HMAC) {
- /* Of course this'll always work, so just save
- * ourselves the effort. */
- continue;
- }
-#endif
- /* Try to figure out what's going on with this
- * principal. */
- kerberos_derive_salting_principal_for_enctype(service_principal,
- context,
- ccache,
- enctypes[i],
- enctypes);
+ if (fchmod(fd, 0644)==-1) {
+ DEBUG(0,("create_local_private_krb5_conf_for_domain: fchmod failed for %s."
+ " Errno %s\n",
+ tmpname, strerror(errno) ));
+ unlink(tmpname);
+ close(fd);
+ TALLOC_FREE(dname);
+ return False;
}
-}
-
-/************************************************************************
- Wrapper function for the above.
- ************************************************************************/
-BOOL kerberos_derive_salting_principal(char *service_principal)
-{
- krb5_context context = NULL;
- krb5_enctype *enctypes = NULL;
- krb5_ccache ccache = NULL;
- krb5_error_code ret = 0;
-
- initialize_krb5_error_table();
- if ((ret = krb5_init_context(&context)) != 0) {
- DEBUG(1,("kerberos_derive_cifs_salting_principals: krb5_init_context failed. %s\n",
- error_message(ret)));
+ ret = write(fd, file_contents, flen);
+ if (flen != ret) {
+ DEBUG(0,("create_local_private_krb5_conf_for_domain: write failed,"
+ " returned %d (should be %u). Errno %s\n",
+ (int)ret, (unsigned int)flen, strerror(errno) ));
+ unlink(tmpname);
+ close(fd);
+ TALLOC_FREE(dname);
return False;
}
- if ((ret = get_kerberos_allowed_etypes(context, &enctypes)) != 0) {
- DEBUG(1,("kerberos_derive_cifs_salting_principals: get_kerberos_allowed_etypes failed. %s\n",
- error_message(ret)));
- goto out;
+ if (close(fd)==-1) {
+ DEBUG(0,("create_local_private_krb5_conf_for_domain: close failed."
+ " Errno %s\n", strerror(errno) ));
+ unlink(tmpname);
+ TALLOC_FREE(dname);
+ return False;
}
- if ((ret = krb5_cc_resolve(context, LIBADS_CCACHE_NAME, &ccache)) != 0) {
- DEBUG(3, ("get_service_ticket: krb5_cc_resolve for %s failed: %s\n",
- LIBADS_CCACHE_NAME, error_message(ret)));
- goto out;
+ if (rename(tmpname, fname) == -1) {
+ DEBUG(0,("create_local_private_krb5_conf_for_domain: rename "
+ "of %s to %s failed. Errno %s\n",
+ tmpname, fname, strerror(errno) ));
+ unlink(tmpname);
+ TALLOC_FREE(dname);
+ return False;
}
- kerberos_derive_salting_principal_direct(context, ccache, enctypes, service_principal);
+ DEBUG(5,("create_local_private_krb5_conf_for_domain: wrote "
+ "file %s with realm %s KDC = %s\n",
+ fname, realm_upper, inet_ntoa(ip) ));
- out:
- if (enctypes) {
- free_kerberos_etypes(context, enctypes);
- }
- if (ccache) {
- krb5_cc_destroy(context, ccache);
- }
- if (context) {
- krb5_free_context(context);
- }
+ /* Set the environment variable to this file. */
+ setenv("KRB5_CONFIG", fname, 1);
- return ret ? False : True;
-}
+#if defined(OVERWRITE_SYSTEM_KRB5_CONF)
-/************************************************************************
- Core function to try and determine what salt is being used for any keytab
- keys.
- ************************************************************************/
+#define SYSTEM_KRB5_CONF_PATH "/etc/krb5.conf"
+ /* Insanity, sheer insanity..... */
-BOOL kerberos_derive_cifs_salting_principals(void)
-{
- fstring my_fqdn;
- char *service = NULL;
- krb5_context context = NULL;
- krb5_enctype *enctypes = NULL;
- krb5_ccache ccache = NULL;
- krb5_error_code ret = 0;
- BOOL retval = False;
+ if (strequal(realm, lp_realm())) {
+ pstring linkpath;
+ int lret;
- initialize_krb5_error_table();
- if ((ret = krb5_init_context(&context)) != 0) {
- DEBUG(1,("kerberos_derive_cifs_salting_principals: krb5_init_context failed. %s\n",
- error_message(ret)));
- return False;
- }
- if ((ret = get_kerberos_allowed_etypes(context, &enctypes)) != 0) {
- DEBUG(1,("kerberos_derive_cifs_salting_principals: get_kerberos_allowed_etypes failed. %s\n",
- error_message(ret)));
- goto out;
- }
+ lret = readlink(SYSTEM_KRB5_CONF_PATH, linkpath, sizeof(linkpath)-1);
+ linkpath[sizeof(pstring)-1] = '\0';
- if ((ret = krb5_cc_resolve(context, LIBADS_CCACHE_NAME, &ccache)) != 0) {
- DEBUG(3, ("get_service_ticket: krb5_cc_resolve for %s failed: %s\n",
- LIBADS_CCACHE_NAME, error_message(ret)));
- goto out;
- }
+ if (lret == 0 || strcmp(linkpath, fname) == 0) {
+ /* Symlink already exists. */
+ TALLOC_FREE(dname);
+ return True;
+ }
- if (asprintf(&service, "%s$", global_myname()) != -1) {
- strlower_m(service);
- kerberos_derive_salting_principal_direct(context, ccache, enctypes, service);
- SAFE_FREE(service);
- }
- if (asprintf(&service, "cifs/%s", global_myname()) != -1) {
- strlower_m(service);
- kerberos_derive_salting_principal_direct(context, ccache, enctypes, service);
- SAFE_FREE(service);
- }
- if (asprintf(&service, "host/%s", global_myname()) != -1) {
- strlower_m(service);
- kerberos_derive_salting_principal_direct(context, ccache, enctypes, service);
- SAFE_FREE(service);
- }
- if (asprintf(&service, "cifs/%s.%s", global_myname(), lp_realm()) != -1) {
- strlower_m(service);
- kerberos_derive_salting_principal_direct(context, ccache, enctypes, service);
- SAFE_FREE(service);
- }
- if (asprintf(&service, "host/%s.%s", global_myname(), lp_realm()) != -1) {
- strlower_m(service);
- kerberos_derive_salting_principal_direct(context, ccache, enctypes, service);
- SAFE_FREE(service);
- }
- name_to_fqdn(my_fqdn, global_myname());
- if (asprintf(&service, "cifs/%s", my_fqdn) != -1) {
- strlower_m(service);
- kerberos_derive_salting_principal_direct(context, ccache, enctypes, service);
- SAFE_FREE(service);
- }
- if (asprintf(&service, "host/%s", my_fqdn) != -1) {
- strlower_m(service);
- kerberos_derive_salting_principal_direct(context, ccache, enctypes, service);
- SAFE_FREE(service);
+ /* Try and replace with a symlink. */
+ if (symlink(fname, SYSTEM_KRB5_CONF_PATH) == -1) {
+ if (errno != EEXIST) {
+ DEBUG(0,("create_local_private_krb5_conf_for_domain: symlink "
+ "of %s to %s failed. Errno %s\n",
+ fname, SYSTEM_KRB5_CONF_PATH, strerror(errno) ));
+ TALLOC_FREE(dname);
+ return True; /* Not a fatal error. */
+ }
+
+ pstrcpy(linkpath, SYSTEM_KRB5_CONF_PATH);
+ pstrcat(linkpath, ".saved");
+
+ /* Yes, this is a race conditon... too bad. */
+ if (rename(SYSTEM_KRB5_CONF_PATH, linkpath) == -1) {
+ DEBUG(0,("create_local_private_krb5_conf_for_domain: rename "
+ "of %s to %s failed. Errno %s\n",
+ SYSTEM_KRB5_CONF_PATH, linkpath,
+ strerror(errno) ));
+ TALLOC_FREE(dname);
+ return True; /* Not a fatal error. */
+ }
+
+ if (symlink(fname, "/etc/krb5.conf") == -1) {
+ DEBUG(0,("create_local_private_krb5_conf_for_domain: "
+ "forced symlink of %s to /etc/krb5.conf failed. Errno %s\n",
+ fname, strerror(errno) ));
+ TALLOC_FREE(dname);
+ return True; /* Not a fatal error. */
+ }
+ }
}
+#endif
- retval = True;
-
- out:
- if (enctypes) {
- free_kerberos_etypes(context, enctypes);
- }
- if (ccache) {
- krb5_cc_destroy(context, ccache);
- }
- if (context) {
- krb5_free_context(context);
- }
- return retval;
-}
+ TALLOC_FREE(dname);
-int kerberos_kinit_password(const char *principal,
- const char *password,
- int time_offset,
- const char *cache_name)
-{
- return kerberos_kinit_password_ext(principal,
- password,
- time_offset,
- 0,
- 0,
- cache_name,
- False,
- False,
- 0);
+ return True;
}
-
#endif
git.samba.org / sfrench / samba-autobuild / .git / blobdiff