diff options
Diffstat (limited to 'src/ka-kerberos.c')
| -rw-r--r-- | src/ka-kerberos.c | 1114 |
1 files changed, 1114 insertions, 0 deletions
diff --git a/src/ka-kerberos.c b/src/ka-kerberos.c new file mode 100644 index 0000000..e131286 --- /dev/null +++ b/src/ka-kerberos.c @@ -0,0 +1,1114 @@ +/* + * Copyright (C) 2004,2005,2006 Red Hat, Inc. + * Authored by Christopher Aillon <caillon@redhat.com> + * + * Copyright (C) 2008,2009,2010,2011 Guido Guenther <agx@sigxcpu.org> + * + * 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 + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + */ + +#include "config.h" + +#include <stdlib.h> +#include <time.h> +#include <krb5.h> +#include <stdio.h> +#include <sys/wait.h> +#include <string.h> +#include <gtk/gtk.h> +#include <glib/gi18n.h> +#include <gio/gio.h> + +#include "secmem-util.h" +#include "memory.h" + +#include "ka-kerberos.h" +#include "ka-applet-priv.h" +#include "ka-pwdialog.h" +#include "ka-tools.h" +#include "ka-main-window.h" + +#ifdef ENABLE_NETWORK_MANAGER +#include <nm-client.h> + +#if !defined(NM_CHECK_VERSION) +#define NM_CHECK_VERSION(x,y,z) 0 +#endif +#endif + +#ifdef HAVE_HX509_ERR_H +#include <hx509_err.h> +#endif + +static krb5_context kcontext; +static krb5_principal kprincipal; +static krb5_timestamp creds_expiry; +static krb5_timestamp canceled_creds_expiry; +static gboolean canceled; +static gboolean invalid_auth; +static gboolean is_online = TRUE; +static gboolean kcontext_valid; +GFileMonitor *ccache_monitor; + +static int grab_credentials (KaApplet *applet); +static int ka_renew_credentials (KaApplet *applet); +static gboolean ka_get_tgt_from_ccache (krb5_context context, + krb5_creds *creds); + +#ifdef ENABLE_NETWORK_MANAGER +NMClient *nm_client; +#endif + +/* YAY for different Kerberos implementations */ +static int +get_cred_forwardable (krb5_creds *creds) +{ +#if defined(HAVE_KRB5_CREDS_TICKET_FLAGS) && defined(TKT_FLG_FORWARDABLE) + return creds->ticket_flags & TKT_FLG_FORWARDABLE; +#elif defined(HAVE_KRB5_CREDS_FLAGS_B_FORWARDABLE) + return creds->flags.b.forwardable; +#elif defined(HAVE_KRB5_CREDS_FLAGS) && defined(KDC_OPT_FORWARDABLE) + return creds->flags & KDC_OPT_FORWARDABLE; +#endif +} + +static int +get_cred_renewable (krb5_creds *creds) +{ +#if defined(HAVE_KRB5_CREDS_TICKET_FLAGS) && defined(TKT_FLG_RENEWABLE) + return creds->ticket_flags & TKT_FLG_RENEWABLE; +#elif defined(HAVE_KRB5_CREDS_FLAGS_B_RENEWABLE) + return creds->flags.b.renewable; +#elif defined(HAVE_KRB5_CREDS_FLAGS) && defined(KDC_OPT_RENEWABLE) + return creds->flags & KDC_OPT_RENEWABLE; +#endif +} + +static krb5_error_code +get_renewed_creds (krb5_context context, + krb5_creds *creds, + krb5_principal client, + krb5_ccache ccache, char *in_tkt_service) +{ +#ifdef HAVE_KRB5_GET_RENEWED_CREDS + return krb5_get_renewed_creds (context, creds, client, ccache, + in_tkt_service); +#else + return 1; /* XXX is there something better to return? */ +#endif +} + +static int +get_cred_proxiable (krb5_creds *creds) +{ +#if defined(HAVE_KRB5_CREDS_TICKET_FLAGS) && defined(TKT_FLG_PROXIABLE) + return creds->ticket_flags & TKT_FLG_PROXIABLE; +#elif defined(HAVE_KRB5_CREDS_FLAGS_B_PROXIABLE) + return creds->flags.b.proxiable; +#elif defined(HAVE_KRB5_CREDS_FLAGS) && defined(KDC_OPT_PROXIABLE) + return creds->flags & KDC_OPT_PROXIABLE; +#endif +} + +static size_t +get_principal_realm_length (krb5_principal p) +{ +#if defined(HAVE_KRB5_PRINCIPAL_REALM_AS_STRING) + return strlen (p->realm); +#elif defined(HAVE_KRB5_PRINCIPAL_REALM_AS_DATA) + return p->realm.length; +#endif +} + +static const char * +get_principal_realm_data (krb5_principal p) +{ +#if defined(HAVE_KRB5_PRINCIPAL_REALM_AS_STRING) + return p->realm; +#elif defined(HAVE_KRB5_PRINCIPAL_REALM_AS_DATA) + return p->realm.data; +#endif +} + +static void +ka_krb5_free_error_message (krb5_context context, const char *msg) +{ +#if defined(HAVE_KRB5_FREE_ERROR_MESSAGE) + krb5_free_error_message (context, msg); +#elif defined(HAVE_KRB5_FREE_ERROR_STRING) + krb5_free_error_string (context, (char *) msg); +#else +# error No way to free error string. +#endif +} + +/* + * Returns a descriptive error message or kerberos related error + * returned pointer must be freed using g_free(). + */ +static char * +ka_get_error_message (krb5_context context, krb5_error_code err) +{ + char *msg = NULL; + +#if defined(HAVE_KRB5_GET_ERROR_MESSAGE) + const char *krberr; + + krberr = krb5_get_error_message (context, err); + msg = g_strdup (krberr); + ka_krb5_free_error_message (context, krberr); +#else +# error No detailed error message information +#endif + if (msg == NULL) + msg = g_strdup (_("unknown error")); + return msg; +} + + +static void +ka_krb5_cc_clear_mcred (krb5_creds *mcred) +{ +#if defined HAVE_KRB5_CC_CLEAR_MCRED + krb5_cc_clear_mcred (mcred); +#else + memset (mcred, 0, sizeof (krb5_creds)); +#endif +} + + +/* ***************************************************************** */ +/* ***************************************************************** */ + +/* log a kerberos error messge */ +static void +ka_log_error_message (const char *prefix, krb5_context context, + krb5_error_code err) +{ + char *errmsg = ka_get_error_message (context, err); + + g_warning ("%s: %s", prefix, errmsg); + g_free (errmsg); +} + + +static gboolean +credentials_expiring_real (KaApplet *applet) +{ + krb5_creds my_creds; + krb5_timestamp now; + gboolean retval = FALSE; + + memset (&my_creds, 0, sizeof (my_creds)); + ka_applet_set_tgt_renewable (applet, FALSE); + if (!ka_get_tgt_from_ccache (kcontext, &my_creds)) { + creds_expiry = 0; + retval = TRUE; + goto out; + } + + /* copy principal from cache if any */ + if (krb5_principal_compare (kcontext, my_creds.client, kprincipal)) { + krb5_free_principal (kcontext, kprincipal); + krb5_copy_principal (kcontext, my_creds.client, &kprincipal); + } + creds_expiry = my_creds.times.endtime; + if ((krb5_timeofday (kcontext, &now) == 0) && + (now + ka_applet_get_pw_prompt_secs (applet) > + my_creds.times.endtime)) + retval = TRUE; + + /* If our creds are expiring, determine whether they are renewable. + * If the expiry is already at the renew_till time, don't consider + * credentials renewable */ + if (retval && get_cred_renewable (&my_creds) + && my_creds.times.renew_till > now + && my_creds.times.renew_till > creds_expiry) { + ka_applet_set_tgt_renewable (applet, TRUE); + } + + out: + krb5_free_cred_contents (kcontext, &my_creds); + ka_applet_update_status (applet, creds_expiry); + return retval; +} + + +/* time in seconds the tgt will be still valid */ +int +ka_tgt_valid_seconds () +{ + krb5_timestamp now; + + if (krb5_timeofday (kcontext, &now)) + return 0; + + return (creds_expiry - now); +} + + +/* return credential cache filename, strip "FILE:" prefix if necessary */ +static const char * +ka_ccache_filename (void) +{ + const gchar *name; + + name = krb5_cc_default_name (kcontext); + if (g_str_has_prefix (name, "FILE:")) + return strchr (name, ':') + 1; + else if (g_str_has_prefix (name, "SCC:")) + g_warning ("Cannot monitor sqlite based cache '%s'", name); + else + g_warning ("Unsupported cache type for '%s'", name); + return NULL; +} + + +static void +ka_format_time (time_t t, gchar *ts, size_t len) +{ + g_strlcpy (ts, ctime (&t) + 4, len); + ts[15] = 0; +} + + +/* fill in service tickets data */ +gboolean +ka_get_service_tickets (GtkListStore * tickets) +{ + krb5_cc_cursor cursor; + krb5_creds creds; + krb5_error_code ret; + GtkTreeIter iter; + krb5_ccache ccache; + char *name; + krb5_timestamp sec; + gchar start_time[128], end_time[128], end_time_markup[256]; + gboolean retval = FALSE; + + gtk_list_store_clear (tickets); + + krb5_timeofday (kcontext, &sec); + ret = krb5_cc_default (kcontext, &ccache); + g_return_val_if_fail (!ret, FALSE); + + ret = krb5_cc_start_seq_get (kcontext, ccache, &cursor); + if (ret) { + ka_log_error_message ("krb5_cc_start_seq_get", kcontext, ret); + + /* if the file doesn't exist, it's not an error if we can't + * parse it */ + if (!g_file_test (ka_ccache_filename (), G_FILE_TEST_EXISTS)) + gtk_list_store_append (tickets, &iter); + gtk_list_store_set (tickets, &iter, + PRINCIPAL_COLUMN, _("Your ticket cache is currently empty"), + FORWARDABLE_COLUMN, FALSE, + RENEWABLE_COLUMN, FALSE, + PROXIABLE_COLUMN, FALSE, -1); + retval = TRUE; + goto out; + } + + while ((ret = krb5_cc_next_cred (kcontext, ccache, &cursor, &creds)) == 0) { + gboolean renewable, proxiable, forwardable; + + if (creds.times.starttime) + ka_format_time (creds.times.starttime, start_time, + sizeof (start_time)); + else + ka_format_time (creds.times.authtime, start_time, + sizeof (start_time)); + + ka_format_time (creds.times.endtime, end_time, sizeof (end_time)); + if (creds.times.endtime > sec) + strcpy (end_time_markup, end_time); + else + g_snprintf (end_time_markup, sizeof (end_time_markup), + "%s <span foreground=\"red\" style=\"italic\">(%s)</span>", + end_time, _("Expired")); + + forwardable = get_cred_forwardable (&creds); + renewable = get_cred_renewable (&creds); + proxiable = get_cred_proxiable (&creds); + + ret = krb5_unparse_name (kcontext, creds.server, &name); + if (!ret) { + gtk_list_store_append (tickets, &iter); + gtk_list_store_set (tickets, &iter, + PRINCIPAL_COLUMN, name, + START_TIME_COLUMN, start_time, + END_TIME_COLUMN, end_time_markup, + FORWARDABLE_COLUMN, forwardable, + RENEWABLE_COLUMN, renewable, + PROXIABLE_COLUMN, proxiable, -1); + free (name); + } else + ka_log_error_message ("krb5_unparse_name", kcontext, ret); + krb5_free_cred_contents (kcontext, &creds); + } + if (ret != KRB5_CC_END) + ka_log_error_message ("krb5_cc_get_next", kcontext, ret); + + ret = krb5_cc_end_seq_get (kcontext, ccache, &cursor); + if (ret) + ka_log_error_message ("krb5_cc_end_seq_get", kcontext, ret); + + retval = TRUE; + out: + ret = krb5_cc_close (kcontext, ccache); + g_return_val_if_fail (!ret, FALSE); + + return retval; +} + + +/* Check for things we have to do while the password dialog is open */ +static gboolean +krb5_auth_dialog_do_updates (gpointer data) +{ + KaApplet *applet = KA_APPLET (data); + KaPwDialog *pwdialog = ka_applet_get_pwdialog (applet); + + g_return_val_if_fail (pwdialog != NULL, FALSE); + /* Update creds_expiry and close the applet if we got the creds by other means (e.g. kinit) */ + if (!credentials_expiring_real (applet)) + ka_pwdialog_hide (pwdialog, FALSE); + + /* Update the expiry information in the dialog */ + ka_pwdialog_status_update (pwdialog); + return TRUE; +} + + +static krb5_error_code +auth_dialog_prompter (krb5_context ctx G_GNUC_UNUSED, + void *data, + const char *name G_GNUC_UNUSED, + const char *banner G_GNUC_UNUSED, + int num_prompts, krb5_prompt prompts[]) +{ + KaApplet *applet = KA_APPLET (data); + KaPwDialog *pwdialog = ka_applet_get_pwdialog (applet); + krb5_error_code errcode; + int i; + + errcode = KRB5KRB_ERR_GENERIC; + canceled = FALSE; + canceled_creds_expiry = 0; + + if (banner && !num_prompts) + ka_applet_set_msg (applet, banner); + + for (i = 0; i < num_prompts; i++) { + const gchar *password = NULL; + int password_len = 0; + int response; + guint32 source_id; + + errcode = KRB5_LIBOS_CANTREADPWD; + + source_id = + g_timeout_add_seconds (5, + (GSourceFunc) krb5_auth_dialog_do_updates, + applet); + ka_pwdialog_setup (pwdialog, (gchar *) prompts[i].prompt, + invalid_auth); + response = ka_pwdialog_run (pwdialog); + switch (response) { + case GTK_RESPONSE_OK: + password = ka_pwdialog_get_password (pwdialog); + password_len = strlen (password); + break; + case GTK_RESPONSE_DELETE_EVENT: + case GTK_RESPONSE_CANCEL: + canceled = TRUE; + break; + case GTK_RESPONSE_NONE: + break; + default: + g_warning ("Unknown Response: %d", response); + g_assert_not_reached (); + } + g_source_remove (source_id); + + if (!password) + goto cleanup; + if (password_len + 1 > prompts[i].reply->length) { + g_warning ("Password too long %d/%d", password_len + 1, + prompts[i].reply->length); + goto cleanup; + } + + memcpy (prompts[i].reply->data, (char *) password, password_len + 1); + prompts[i].reply->length = password_len; + errcode = 0; + } + cleanup: + ka_pwdialog_hide (pwdialog, TRUE); + /* Reset this, so we know the next time we get a TRUE value, it is accurate. */ + invalid_auth = FALSE; + + return errcode; +} + + +#ifdef ENABLE_NETWORK_MANAGER +static void +ka_nm_client_state_changed_cb (NMClient * client, + GParamSpec *pspec G_GNUC_UNUSED, gpointer data) +{ + NMState state; + gboolean *online = (gboolean *) data; + + state = nm_client_get_state (client); + switch (state) { + case NM_STATE_UNKNOWN: + case NM_STATE_ASLEEP: + case NM_STATE_CONNECTING: + KA_DEBUG ("Network state: %d", state); + /* do nothing */ + break; +#if NM_CHECK_VERSION(0,8,992) + case NM_STATE_DISCONNECTING: +#endif + case NM_STATE_DISCONNECTED: + KA_DEBUG ("Network disconnected"); + *online = FALSE; + break; +#if NM_CHECK_VERSION(0,8,992) + case NM_STATE_CONNECTED_LOCAL: + case NM_STATE_CONNECTED_SITE: + case NM_STATE_CONNECTED_GLOBAL: +#else + case NM_STATE_CONNECTED: +#endif + KA_DEBUG ("Network connected"); + *online = TRUE; + break; + } +} +#endif + +/* credentials expiring timer */ +static gboolean +credentials_expiring (gpointer *data) +{ + KaApplet *applet = KA_APPLET (data); + + KA_DEBUG ("Checking expiry <%ds", ka_applet_get_pw_prompt_secs (applet)); + if (credentials_expiring_real (applet) && is_online) { + KA_DEBUG ("Expiry @ %ld", creds_expiry); + + if (!ka_renew_credentials (applet)) + KA_DEBUG ("Credentials renewed"); + } + ka_applet_update_status (applet, creds_expiry); + + return TRUE; +} + + +/* run once, then terminate the timer */ +static gboolean +credentials_expiring_once (gpointer *data) +{ + credentials_expiring (data); + return FALSE; +} + + +/* + * set ticket options by looking at krb5.conf and gconf + */ +static void +ka_set_ticket_options (KaApplet *applet, krb5_context context, + krb5_get_init_creds_opt * out, + const char *pk_userid G_GNUC_UNUSED, + const char *pk_anchors G_GNUC_UNUSED) +{ + gboolean flag; + +#ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_SET_DEFAULT_FLAGS + krb5_get_init_creds_opt_set_default_flags (context, PACKAGE, + krb5_principal_get_realm + (context, kprincipal), out); +#endif + g_object_get (applet, "tgt-forwardable", &flag, NULL); + if (flag) + krb5_get_init_creds_opt_set_forwardable (out, flag); + g_object_get (applet, "tgt-proxiable", &flag, NULL); + if (flag) + krb5_get_init_creds_opt_set_proxiable (out, flag); + g_object_get (applet, "tgt-renewable", &flag, NULL); + if (flag) { + krb5_deltat r = 3600 * 24 * 30; /* 1 month */ + + krb5_get_init_creds_opt_set_renew_life (out, r); + } +#if ENABLE_PKINIT && HAVE_KRB5_GET_INIT_CREDS_OPT_SET_PA + /* pkinit optins for MIT Kerberos */ + if (pk_userid && strlen (pk_userid)) { + KA_DEBUG ("pkinit with '%s'", pk_userid); + krb5_get_init_creds_opt_set_pa (context, out, + "X509_user_identity", pk_userid); + if (pk_anchors && strlen (pk_anchors)) { + KA_DEBUG ("pkinit anchors '%s'", pk_anchors); + krb5_get_init_creds_opt_set_pa (context, out, + "X509_anchors", pk_anchors); + } + } +#endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_SET_PA */ +} + + +#if ENABLE_PKINIT && HAVE_KRB5_GET_INIT_CREDS_OPT_SET_PKINIT +static krb5_error_code +ka_auth_heimdal_pkinit (KaApplet *applet, krb5_creds *creds, + const char *pk_userid, const char *pk_anchors) +{ + krb5_get_init_creds_opt *opts = NULL; + krb5_error_code retval; + const char *pkinit_anchors = NULL; + + KA_DEBUG ("pkinit with '%s'", pk_userid); + if (pk_anchors && strlen (pk_anchors)) { + pkinit_anchors = pk_anchors; + KA_DEBUG ("pkinit anchors '%s'", pkinit_anchors); + } + + if ((retval = krb5_get_init_creds_opt_alloc (kcontext, &opts))) + goto out; + + ka_set_ticket_options (applet, kcontext, opts, NULL, NULL); + retval = krb5_get_init_creds_opt_set_pkinit (kcontext, opts, kprincipal, pk_userid, pkinit_anchors, NULL, NULL, 0, /* pk_use_enc_key */ + auth_dialog_prompter, applet, /* data */ + NULL); /* passwd */ + KA_DEBUG ("pkinit returned with %d", retval); + if (retval) + goto out; + + retval = krb5_get_init_creds_password (kcontext, creds, kprincipal, + NULL, auth_dialog_prompter, applet, + 0, NULL, opts); + out: + if (opts) + krb5_get_init_creds_opt_free (kcontext, opts); + return retval; +} +#endif /* ! ENABLE_PKINIT */ + +static krb5_error_code +ka_auth_password (KaApplet *applet, krb5_creds *creds, + const char *pk_userid, const char *pk_anchors) +{ + krb5_error_code retval; + krb5_get_init_creds_opt *opts = NULL; + + if ((retval = krb5_get_init_creds_opt_alloc (kcontext, &opts))) + goto out; + ka_set_ticket_options (applet, kcontext, opts, pk_userid, pk_anchors); + + retval = krb5_get_init_creds_password (kcontext, creds, kprincipal, + NULL, auth_dialog_prompter, applet, + 0, NULL, opts); + out: + if (opts) + krb5_get_init_creds_opt_free (kcontext, opts); + return retval; +} + +static krb5_error_code +ka_parse_name (KaApplet *applet, krb5_context krbcontext, + krb5_principal * kprinc) +{ + krb5_error_code ret; + gchar *principal = NULL; + + if (*kprinc != NULL) + krb5_free_principal (krbcontext, *kprinc); + + g_object_get (applet, "principal", &principal, NULL); + ret = krb5_parse_name (krbcontext, principal, kprinc); + + g_free (principal); + return ret; +} + + +/* + * return current principal in text form + * + * caller needs to free the returned result using g_free(); + */ +char * +ka_unparse_name () +{ + char *princ, *gprinc = NULL; + krb5_error_code err; + + if (!kprincipal) + goto out; + + if ((err = krb5_unparse_name (kcontext, kprincipal, &princ))) { + ka_log_error_message (__func__, kcontext, err); + goto out; + } + + gprinc = g_strdup (princ); + free (princ); + out: + return gprinc; +} + + +static void +ccache_changed_cb (GFileMonitor *monitor G_GNUC_UNUSED, + GFile *file, + GFile *other_file G_GNUC_UNUSED, + GFileMonitorEvent event_type, gpointer data) +{ + KaApplet *applet = KA_APPLET (data); + gchar *ccache_name = g_file_get_path (file); + + switch (event_type) { + case G_FILE_MONITOR_EVENT_DELETED: + case G_FILE_MONITOR_EVENT_CREATED: + case G_FILE_MONITOR_EVENT_CHANGED: + KA_DEBUG ("%s changed", ccache_name); + credentials_expiring ((gpointer) applet); + g_signal_emit_by_name(applet, "krb-ccache-changed"); + break; + default: + KA_DEBUG ("%s unhandled event: %d", ccache_name, event_type); + } + g_free (ccache_name); +} + + +static GFileMonitor * +monitor_ccache (KaApplet *applet) +{ + const gchar *ccache_name; + GFile *ccache; + GFileMonitor *monitor = NULL; + GError *err = NULL; + + ccache_name = ka_ccache_filename (); + g_return_val_if_fail (ccache_name != NULL, FALSE); + + ccache = g_file_new_for_path (ccache_name); + monitor = g_file_monitor_file (ccache, G_FILE_MONITOR_NONE, NULL, &err); + g_assert ((!monitor && err) || (monitor && !err)); + if (!monitor) { + /* cache disappeared? */ + if (err->code == G_FILE_ERROR_NOENT) + credentials_expiring ((gpointer) applet); + else + g_warning ("Failed to monitor %s: %s", ccache_name, err->message); + } else { + /* g_file_monitor_set_rate_limit(monitor, 10*1000); */ + g_signal_connect (monitor, "changed", G_CALLBACK (ccache_changed_cb), + applet); + KA_DEBUG ("Monitoring %s", ccache_name); + } + g_object_unref (ccache); + g_clear_error (&err); + return monitor; +} + + +/* grab credentials interactively */ +static int +grab_credentials (KaApplet *applet) +{ + krb5_error_code retval = KRB5_KDC_UNREACH; + krb5_creds my_creds; + krb5_ccache ccache; + gchar *pk_userid = NULL; + gchar *pk_anchors = NULL; + gchar *errmsg = NULL; + gboolean pw_auth = TRUE; + + memset (&my_creds, 0, sizeof (my_creds)); + + retval = ka_parse_name (applet, kcontext, &kprincipal); + if (retval) + goto out2; + + retval = krb5_cc_default (kcontext, &ccache); + if (retval) + goto out2; + + g_object_get (applet, "pk-userid", &pk_userid, + "pk-anchors", &pk_anchors, NULL); +#if ENABLE_PKINIT && HAVE_HX509_ERR_H && HAVE_KRB5_GET_INIT_CREDS_OPT_SET_PKINIT + /* pk_userid set: try pkinit */ + if (pk_userid && strlen (pk_userid)) { + retval = ka_auth_heimdal_pkinit (applet, &my_creds, + pk_userid, pk_anchors); + /* other error than: "no token found" - no need to try password auth: */ + if (retval != HX509_PKCS11_NO_TOKEN && retval != HX509_PKCS11_NO_SLOT) + pw_auth = FALSE; + } +#endif /* ENABLE_PKINIT */ + if (pw_auth) + retval = ka_auth_password (applet, &my_creds, pk_userid, pk_anchors); + + creds_expiry = my_creds.times.endtime; + if (canceled) + canceled_creds_expiry = creds_expiry; + if (retval) { + switch (retval) { + case KRB5KDC_ERR_PREAUTH_FAILED: + case KRB5KRB_AP_ERR_BAD_INTEGRITY: +#ifdef HAVE_HX509_ERR_H + case HX509_PKCS11_LOGIN: +#endif /* Invalid password/pin, try again. */ + invalid_auth = TRUE; + break; + default: + errmsg = ka_get_error_message (kcontext, retval); + KA_DEBUG ("Auth failed with %d: %s", retval, errmsg); + g_free (errmsg); + break; + } + goto out; + } + retval = krb5_cc_initialize (kcontext, ccache, kprincipal); + if (retval) + goto out; + + retval = krb5_cc_store_cred (kcontext, ccache, &my_creds); + if (retval) + goto out; + out: + krb5_free_cred_contents (kcontext, &my_creds); + krb5_cc_close (kcontext, ccache); + out2: + g_free (pk_userid); + return retval; +} + +/* try to renew the credentials noninteractively */ +static int +ka_renew_credentials (KaApplet *applet) +{ + krb5_error_code retval; + krb5_creds my_creds; + krb5_ccache ccache; + + memset (&my_creds, 0, sizeof (my_creds)); + if (kprincipal == NULL) { + retval = ka_parse_name (applet, kcontext, &kprincipal); + if (retval) + return retval; + } + + retval = krb5_cc_default (kcontext, &ccache); + if (retval) + return retval; + + retval = ka_get_tgt_from_ccache (kcontext, &my_creds); + if (!retval) { + krb5_free_cred_contents (kcontext, &my_creds); + krb5_cc_close (kcontext, ccache); + return -1; + } + + if (ka_applet_get_tgt_renewable (applet)) { + krb5_free_cred_contents (kcontext, &my_creds); + retval = + get_renewed_creds (kcontext, &my_creds, kprincipal, ccache, NULL); + if (retval) + goto out; + + retval = krb5_cc_initialize (kcontext, ccache, kprincipal); + if (retval) { + ka_log_error_message ("krb5_cc_initialize", kcontext, retval); + goto out; + } + retval = krb5_cc_store_cred (kcontext, ccache, &my_creds); + if (retval) { + ka_log_error_message ("krb5_cc_store_cred", kcontext, retval); + goto out; + } + ka_applet_signal_emit (applet, KA_SIGNAL_RENEWED_TGT, + my_creds.times.endtime); + } + out: + if (!retval) + creds_expiry = my_creds.times.endtime; + krb5_free_cred_contents (kcontext, &my_creds); + krb5_cc_close (kcontext, ccache); + return retval; +} + + +/* get principal associated with the default credentials cache - if found store + * it in *creds, return FALSE otwerwise */ +static gboolean +ka_get_tgt_from_ccache (krb5_context context, krb5_creds *creds) +{ + krb5_ccache ccache; + krb5_creds pattern; + krb5_principal principal; + gboolean ret = FALSE; + + ka_krb5_cc_clear_mcred (&pattern); + + if (krb5_cc_default (context, &ccache)) + return FALSE; + + if (krb5_cc_get_principal (context, ccache, &principal)) + goto out; + + if (krb5_build_principal_ext (context, &pattern.server, + get_principal_realm_length (principal), + get_principal_realm_data (principal), + KRB5_TGS_NAME_SIZE, + KRB5_TGS_NAME, + get_principal_realm_length (principal), + get_principal_realm_data (principal), 0)) { + goto out_free_princ; + } + pattern.client = principal; + if (!krb5_cc_retrieve_cred (context, ccache, 0, &pattern, creds)) + ret = TRUE; + + krb5_free_principal (context, pattern.server); + out_free_princ: + krb5_free_principal (context, principal); + out: + krb5_cc_close (context, ccache); + return ret; +} + +static gboolean +ka_krb5_context_init () +{ + krb5_error_code err; + gboolean have_tgt = FALSE; + krb5_creds creds; + + err = krb5_init_context (&kcontext); + if (err) + return FALSE; + else + kcontext_valid = TRUE; + + have_tgt = ka_get_tgt_from_ccache (kcontext, &creds); + if (have_tgt) { + krb5_copy_principal (kcontext, creds.client, &kprincipal); + krb5_free_cred_contents (kcontext, &creds); + } + return have_tgt; +} + + +static gboolean +ka_krb5_context_free () +{ + if (kcontext_valid) { + krb5_free_context (kcontext); + kcontext_valid = FALSE; + } + return TRUE; +} + + +gboolean +ka_destroy_ccache (KaApplet *applet) +{ + krb5_ccache ccache; + const char *cache; + krb5_error_code ret; + + cache = krb5_cc_default_name (kcontext); + ret = krb5_cc_resolve (kcontext, cache, &ccache); + ret = krb5_cc_destroy (kcontext, ccache); + + credentials_expiring_real (applet); + + if (ret) + return FALSE; + else + return TRUE; +} + + +/* + * check if we have valid credentials for the requested principal - if not, grab them + * principal: requested principal - if empty use default + */ +gboolean +ka_check_credentials (KaApplet *applet, const char *newprincipal) +{ + gboolean success = FALSE; + int retval; + char *principal; + + g_object_get (applet, "principal", &principal, NULL); + + if (strlen (newprincipal)) { + krb5_principal knewprinc; + + /* no ticket cache: is requested princ the one from our config? */ + if (!kprincipal && g_strcmp0 (principal, newprincipal)) { + KA_DEBUG ("Requested principal %s not %s", principal, + newprincipal); + goto out; + } + + /* ticket cache: check if the requested principal is the one we have */ + retval = krb5_parse_name (kcontext, newprincipal, &knewprinc); + if (retval) { + g_warning ("Cannot parse principal '%s'", newprincipal); + goto out; + } + if (kprincipal + && !krb5_principal_compare (kcontext, kprincipal, knewprinc)) { + KA_DEBUG ("Current Principal '%s' not '%s'", principal, + newprincipal); + krb5_free_principal (kcontext, knewprinc); + goto out; + } + krb5_free_principal (kcontext, knewprinc); + } + + if (credentials_expiring_real (applet)) { + if (!is_online) + success = FALSE; + else + success = ka_grab_credentials (applet); + } else + success = TRUE; + out: + g_free (principal); + return success; +} + + +/* initiate grabbing of credentials (e.g. on leftclick of tray icon) */ +gboolean +ka_grab_credentials (KaApplet *applet) +{ + int retval; + int success = FALSE; + KaPwDialog *pwdialog = ka_applet_get_pwdialog (applet); + + ka_pwdialog_set_persist (pwdialog, TRUE); + do { + retval = grab_credentials (applet); + if (invalid_auth) + continue; + if (canceled) + break; + if (retval) { + gchar *errmsg; + + errmsg = ka_get_error_message (kcontext, retval); + ka_pwdialog_error (pwdialog, errmsg); + g_free (errmsg); + break; + } else { + success = TRUE; + break; + } + } while (TRUE); + + ka_pwdialog_set_persist (pwdialog, FALSE); + credentials_expiring_real (applet); + + return success; +} + + +static void +ka_secmem_init (void) +{ + /* Initialize secure memory. 1 is too small, so the default size + will be used. */ + secmem_init (1); + secmem_set_flags (SECMEM_WARN); + drop_privs (); + + if (atexit (secmem_term)) + g_error ("Couln't register atexit handler"); +} + + +static void +ka_nm_shutdown (void) +{ +#ifdef ENABLE_NETWORK_MANAGER + if (nm_client) { + g_object_unref (nm_client); + nm_client = NULL; + } +#endif +} + + +static gboolean +ka_nm_init (void) +{ +#ifdef ENABLE_NETWORK_MANAGER + nm_client = nm_client_new (); + if (!nm_client) { + g_warning ("Could not initialize nm-client"); + } else { + g_signal_connect (nm_client, "notify::state", + G_CALLBACK (ka_nm_client_state_changed_cb), + &is_online); + /* Set initial state */ + ka_nm_client_state_changed_cb (nm_client, NULL, &is_online); + } +#endif /* ENABLE_NETWORK_MANAGER */ + return TRUE; +} + + +gboolean +ka_kerberos_init (KaApplet *applet) +{ + gboolean ret; + + ka_secmem_init (); + ret = ka_krb5_context_init (applet); + ka_nm_init (); + g_timeout_add_seconds (CREDENTIAL_CHECK_INTERVAL, + (GSourceFunc) credentials_expiring, applet); + g_idle_add ((GSourceFunc) credentials_expiring_once, applet); + ccache_monitor = monitor_ccache (applet); + return ret; +} + + +gboolean +ka_kerberos_destroy () +{ + ka_nm_shutdown (); + + if (ccache_monitor) + g_object_unref (ccache_monitor); + + ka_krb5_context_free (); + return TRUE; +} + +/* + * vim:ts=4:sts=4:sw=4:et: + */ |