static int gssd_find_existing_krb5_ccache(uid_t uid, struct dirent **d);
static int gssd_get_single_krb5_cred(krb5_context context,
krb5_keytab kt, struct gssd_k5_kt_princ *ple);
-static int gssd_have_realm_ple(void *realm);
-static int gssd_process_krb5_keytab(krb5_context context, krb5_keytab kt,
- char *kt_name);
/*
return (code);
}
-/*
- * Determine if we already have a ple for the given realm
- *
- * Returns:
- * 0 => no ple found for given realm
- * 1 => found ple for given realm
- */
-static int
-gssd_have_realm_ple(void *r)
-{
- struct gssd_k5_kt_princ *ple;
-#ifdef HAVE_KRB5
- krb5_data *realm = (krb5_data *)r;
-#else
- char *realm = (char *)r;
-#endif
-
- for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
-#ifdef HAVE_KRB5
- if ((realm->length == strlen(ple->realm)) &&
- (strncmp(realm->data, ple->realm, realm->length) == 0)) {
-#else
- if (strcmp(realm, ple->realm) == 0) {
-#endif
- return 1;
- }
- }
- return 0;
-}
-
-/*
- * Process the given keytab file and create a list of principals we
- * might use as machine credentials.
- *
- * Returns:
- * 0 => Sucess
- * nonzero => Error
- */
-static int
-gssd_process_krb5_keytab(krb5_context context, krb5_keytab kt, char *kt_name)
-{
- krb5_kt_cursor cursor;
- krb5_keytab_entry kte;
- krb5_error_code code;
- struct gssd_k5_kt_princ *ple;
- int retval = -1;
-
- /*
- * Look through each entry in the keytab file and determine
- * if we might want to use it as machine credentials. If so,
- * save info in the global principal list (gssd_k5_kt_princ_list).
- * Note: (ple == principal list entry)
- */
- if ((code = krb5_kt_start_seq_get(context, kt, &cursor))) {
- printerr(0, "ERROR: %s while beginning keytab scan "
- "for keytab '%s'\n",
- error_message(code), kt_name);
- retval = code;
- goto out;
- }
-
- while ((code = krb5_kt_next_entry(context, kt, &kte, &cursor)) == 0) {
- char *pname;
- if ((code = krb5_unparse_name(context, kte.principal,
- &pname))) {
- printerr(0, "WARNING: Skipping keytab entry because "
- "we failed to unparse principal name: %s\n",
- error_message(code));
- krb5_kt_free_entry(context, &kte);
- continue;
- }
- printerr(2, "Processing keytab entry for principal '%s'\n",
- pname);
- /* Just use the first keytab entry found for each realm */
- if ((!gssd_have_realm_ple((void *)&kte.principal->realm)) ) {
- printerr(2, "We WILL use this entry (%s)\n", pname);
- ple = malloc(sizeof(struct gssd_k5_kt_princ));
- if (ple == NULL) {
- printerr(0, "ERROR: could not allocate storage "
- "for principal list entry\n");
- k5_free_unparsed_name(context, pname);
- krb5_kt_free_entry(context, &kte);
- retval = ENOMEM;
- goto out;
- }
- /* These will be filled in later */
- ple->next = NULL;
- ple->ccname = NULL;
- ple->endtime = 0;
- if ((ple->realm =
-#ifdef HAVE_KRB5
- strndup(kte.principal->realm.data,
- kte.principal->realm.length))
-#else
- strdup(kte.principal->realm))
-#endif
- == NULL) {
- printerr(0, "ERROR: %s while copying realm to "
- "principal list entry\n",
- "not enough memory");
- k5_free_unparsed_name(context, pname);
- krb5_kt_free_entry(context, &kte);
- retval = ENOMEM;
- goto out;
- }
- if ((code = krb5_copy_principal(context,
- kte.principal, &ple->princ))) {
- printerr(0, "ERROR: %s while copying principal "
- "to principal list entry\n",
- error_message(code));
- k5_free_unparsed_name(context, pname);
- krb5_kt_free_entry(context, &kte);
- retval = code;
- goto out;
- }
- if (gssd_k5_kt_princ_list == NULL)
- gssd_k5_kt_princ_list = ple;
- else {
- ple->next = gssd_k5_kt_princ_list;
- gssd_k5_kt_princ_list = ple;
- }
- }
- else {
- printerr(2, "We will NOT use this entry (%s)\n",
- pname);
- }
- k5_free_unparsed_name(context, pname);
- krb5_kt_free_entry(context, &kte);
- }
-
- if ((code = krb5_kt_end_seq_get(context, kt, &cursor))) {
- printerr(0, "WARNING: %s while ending keytab scan for "
- "keytab '%s'\n",
- error_message(code), kt_name);
- }
-
- retval = 0;
- out:
- return retval;
-}
-
/*
* Depending on the version of Kerberos, we either need to use
* a private function, or simply set the environment variable.
gssd_set_krb5_ccache_name(ccname);
}
-/*
- * The first time through this routine, go through the keytab and
- * determine which keys we will try to use as machine credentials.
- * Every time through this routine, try to obtain credentials using
- * the keytab entries selected the first time through.
- *
- * Returns:
- * 0 => obtained one or more credentials
- * nonzero => error
- *
- */
-
-int
-gssd_refresh_krb5_machine_creds(void)
-{
- krb5_context context = NULL;
- krb5_keytab kt = NULL;;
- krb5_error_code code;
- int retval = -1;
- struct gssd_k5_kt_princ *ple;
- int gotone = 0;
- static int processed_keytab = 0;
-
-
- code = krb5_init_context(&context);
- if (code) {
- printerr(0, "ERROR: %s while initializing krb5 in "
- "gssd_refresh_krb5_machine_creds\n",
- error_message(code));
- retval = code;
- goto out;
- }
-
- printerr(1, "Using keytab file '%s'\n", keytabfile);
-
- if ((code = krb5_kt_resolve(context, keytabfile, &kt))) {
- printerr(0, "ERROR: %s while resolving keytab '%s'\n",
- error_message(code), keytabfile);
- goto out;
- }
-
- /* Only go through the keytab file once. Only print messages once. */
- if (gssd_k5_kt_princ_list == NULL && !processed_keytab) {
- processed_keytab = 1;
- gssd_process_krb5_keytab(context, kt, keytabfile);
- if (gssd_k5_kt_princ_list == NULL) {
- printerr(0, "ERROR: No usable keytab entries found in "
- "keytab '%s'\n", keytabfile);
- printerr(0, "Do you have a valid keytab entry for "
- "%s/<your.host>@<YOUR.REALM> in "
- "keytab file %s ?\n",
- GSSD_SERVICE_NAME, keytabfile);
- printerr(0, "Continuing without (machine) credentials "
- "- nfs4 mounts with Kerberos will fail\n");
- }
- }
-
- /*
- * If we don't have any keytab entries we liked, then we have a problem
- */
- if (gssd_k5_kt_princ_list == NULL) {
- retval = ENOENT;
- goto out;
- }
-
- /*
- * Now go through the list of saved entries and get initial
- * credentials for them (We can't do this while making the
- * list because it messes up the keytab iteration cursor
- * when we use the keytab to get credentials.)
- */
- for (ple = gssd_k5_kt_princ_list; ple; ple = ple->next) {
- if ((gssd_get_single_krb5_cred(context, kt, ple)) == 0) {
- gotone++;
- }
- }
- if (!gotone) {
- printerr(0, "ERROR: No usable machine credentials obtained\n");
- goto out;
- }
-
- retval = 0;
- out:
- if (kt) krb5_kt_close(context, kt);
- krb5_free_context(context);
-
- return retval;
-}
-
-
/*
* Return an array of pointers to names of credential cache files
* which can be used to try to create gss contexts with a server.
projects / nfs-utils.git / commitdiff