400 lines
9.4 KiB
C
400 lines
9.4 KiB
C
/*
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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xrdp: A Remote Desktop Protocol server.
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Copyright (C) Jay Sorg 2005-2007
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*/
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/**
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*
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* @file verify_user_kerberos.c
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* @brief Authenticate user using kerberos
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* @author Jay Sorg
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*
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*/
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#include "arch.h"
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#include "os_calls.h"
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#include <krb5.h>
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typedef enum { INIT_PW, INIT_KT, RENEW, VALIDATE } action_type;
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struct k_opts
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{
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/* in seconds */
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krb5_deltat starttime;
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krb5_deltat lifetime;
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krb5_deltat rlife;
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int forwardable;
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int proxiable;
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int addresses;
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int not_forwardable;
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int not_proxiable;
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int no_addresses;
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int verbose;
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char* principal_name;
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char* service_name;
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char* keytab_name;
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char* k5_cache_name;
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char* k4_cache_name;
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action_type action;
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};
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struct k5_data
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{
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krb5_context ctx;
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krb5_ccache cc;
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krb5_principal me;
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char* name;
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};
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struct user_info
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{
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char* name;
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char* pass;
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};
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/******************************************************************************/
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/* returns boolean */
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static int DEFAULT_CC
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k5_begin(struct k_opts* opts, struct k5_data* k5, struct user_info* u_info)
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{
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krb5_error_code code = 0;
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code = krb5_init_context(&k5->ctx);
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if (code != 0)
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{
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g_printf("krb5_init_context failed in k5_begin\n");
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return 0;
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}
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if (opts->k5_cache_name)
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{
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code = krb5_cc_resolve(k5->ctx, opts->k5_cache_name, &k5->cc);
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if (code != 0)
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{
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g_printf("krb5_cc_resolve failed in k5_begin\n");
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return 0;
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}
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}
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else
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{
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code = krb5_cc_default(k5->ctx, &k5->cc);
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if (code != 0)
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{
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g_printf("krb5_cc_default failed in k5_begin\n");
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return 0;
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}
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}
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if (opts->principal_name)
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{
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/* Use specified name */
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code = krb5_parse_name(k5->ctx, opts->principal_name, &k5->me);
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if (code != 0)
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{
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g_printf("krb5_parse_name failed in k5_begin\n");
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return 0;
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}
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}
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else
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{
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/* No principal name specified */
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if (opts->action == INIT_KT)
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{
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/* Use the default host/service name */
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code = krb5_sname_to_principal(k5->ctx, NULL, NULL,
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KRB5_NT_SRV_HST, &k5->me);
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if (code != 0)
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{
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g_printf("krb5_sname_to_principal failed in k5_begin\n");
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return 0;
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}
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}
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else
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{
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/* Get default principal from cache if one exists */
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code = krb5_cc_get_principal(k5->ctx, k5->cc, &k5->me);
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if (code != 0)
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{
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code = krb5_parse_name(k5->ctx, u_info->name, &k5->me);
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if (code != 0)
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{
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g_printf("krb5_parse_name failed in k5_begin\n");
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return 0;
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}
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}
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}
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}
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code = krb5_unparse_name(k5->ctx, k5->me, &k5->name);
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if (code != 0)
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{
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g_printf("krb5_unparse_name failed in k5_begin\n");
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return 0;
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}
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opts->principal_name = k5->name;
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return 1;
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}
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/******************************************************************************/
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static void DEFAULT_CC
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k5_end(struct k5_data* k5)
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{
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if (k5->name)
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{
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krb5_free_unparsed_name(k5->ctx, k5->name);
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}
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if (k5->me)
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{
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krb5_free_principal(k5->ctx, k5->me);
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}
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if (k5->cc)
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{
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krb5_cc_close(k5->ctx, k5->cc);
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}
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if (k5->ctx)
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{
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krb5_free_context(k5->ctx);
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}
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g_memset(k5, 0, sizeof(struct k5_data));
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}
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/******************************************************************************/
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static krb5_error_code KRB5_CALLCONV
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kinit_prompter(krb5_context ctx, void* data, const char* name,
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const char* banner, int num_prompts, krb5_prompt prompts[])
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{
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int i;
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krb5_prompt_type* types;
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krb5_error_code rc;
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struct user_info* u_info;
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u_info = (struct user_info*)data;
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rc = 0;
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types = krb5_get_prompt_types(ctx);
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for (i = 0; i < num_prompts; i++)
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{
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if (types[i] == KRB5_PROMPT_TYPE_PASSWORD ||
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types[i] == KRB5_PROMPT_TYPE_NEW_PASSWORD_AGAIN)
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{
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g_strncpy(prompts[i].reply->data, u_info->pass, 255);
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}
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}
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return rc;
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}
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/******************************************************************************/
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/* returns boolean */
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static int
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k5_kinit(struct k_opts* opts, struct k5_data* k5, struct user_info* u_info)
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{
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char* doing;
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int notix = 1;
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krb5_keytab keytab = 0;
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krb5_creds my_creds;
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krb5_error_code code = 0;
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krb5_get_init_creds_opt options;
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krb5_address** addresses;
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krb5_get_init_creds_opt_init(&options);
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g_memset(&my_creds, 0, sizeof(my_creds));
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/*
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From this point on, we can goto cleanup because my_creds is
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initialized.
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*/
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if (opts->lifetime)
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{
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krb5_get_init_creds_opt_set_tkt_life(&options, opts->lifetime);
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}
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if (opts->rlife)
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{
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krb5_get_init_creds_opt_set_renew_life(&options, opts->rlife);
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}
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if (opts->forwardable)
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{
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krb5_get_init_creds_opt_set_forwardable(&options, 1);
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}
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if (opts->not_forwardable)
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{
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krb5_get_init_creds_opt_set_forwardable(&options, 0);
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}
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if (opts->proxiable)
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{
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krb5_get_init_creds_opt_set_proxiable(&options, 1);
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}
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if (opts->not_proxiable)
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{
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krb5_get_init_creds_opt_set_proxiable(&options, 0);
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}
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if (opts->addresses)
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{
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addresses = NULL;
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code = krb5_os_localaddr(k5->ctx, &addresses);
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if (code != 0)
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{
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g_printf("krb5_os_localaddr failed in k5_kinit\n");
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goto cleanup;
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}
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krb5_get_init_creds_opt_set_address_list(&options, addresses);
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}
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if (opts->no_addresses)
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{
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krb5_get_init_creds_opt_set_address_list(&options, NULL);
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}
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if ((opts->action == INIT_KT) && opts->keytab_name)
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{
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code = krb5_kt_resolve(k5->ctx, opts->keytab_name, &keytab);
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if (code != 0)
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{
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g_printf("krb5_kt_resolve failed in k5_kinit\n");
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goto cleanup;
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}
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}
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switch (opts->action)
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{
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case INIT_PW:
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code = krb5_get_init_creds_password(k5->ctx, &my_creds, k5->me,
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0, kinit_prompter, u_info,
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opts->starttime,
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opts->service_name,
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&options);
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break;
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case INIT_KT:
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code = krb5_get_init_creds_keytab(k5->ctx, &my_creds, k5->me,
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keytab,
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opts->starttime,
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opts->service_name,
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&options);
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break;
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case VALIDATE:
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code = krb5_get_validated_creds(k5->ctx, &my_creds, k5->me, k5->cc,
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opts->service_name);
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break;
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case RENEW:
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code = krb5_get_renewed_creds(k5->ctx, &my_creds, k5->me, k5->cc,
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opts->service_name);
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break;
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}
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if (code != 0)
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{
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doing = 0;
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switch (opts->action)
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{
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case INIT_PW:
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case INIT_KT:
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doing = "getting initial credentials";
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break;
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case VALIDATE:
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doing = "validating credentials";
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break;
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case RENEW:
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doing = "renewing credentials";
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break;
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}
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if (code == KRB5KRB_AP_ERR_BAD_INTEGRITY)
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{
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g_printf("sesman: Password incorrect while %s in k5_kinit\n", doing);
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}
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else
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{
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g_printf("sesman: error while %s in k5_kinit\n", doing);
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}
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goto cleanup;
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}
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if (!opts->lifetime)
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{
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/* We need to figure out what lifetime to use for Kerberos 4. */
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opts->lifetime = my_creds.times.endtime - my_creds.times.authtime;
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}
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code = krb5_cc_initialize(k5->ctx, k5->cc, k5->me);
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if (code != 0)
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{
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g_printf("krb5_cc_initialize failed in k5_kinit\n");
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goto cleanup;
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}
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code = krb5_cc_store_cred(k5->ctx, k5->cc, &my_creds);
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if (code != 0)
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{
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g_printf("krb5_cc_store_cred failed in k5_kinit\n");
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goto cleanup;
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}
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notix = 0;
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cleanup:
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if (my_creds.client == k5->me)
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{
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my_creds.client = 0;
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}
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krb5_free_cred_contents(k5->ctx, &my_creds);
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if (keytab)
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{
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krb5_kt_close(k5->ctx, keytab);
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}
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return notix ? 0 : 1;
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}
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/******************************************************************************/
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/* returns boolean */
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int DEFAULT_CC
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auth_userpass(char* user, char* pass)
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{
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struct k_opts opts;
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struct k5_data k5;
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struct user_info u_info;
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int got_k5;
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int authed_k5;
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g_memset(&opts, 0, sizeof(opts));
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opts.action = INIT_PW;
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g_memset(&k5, 0, sizeof(k5));
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g_memset(&u_info, 0, sizeof(u_info));
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u_info.name = user;
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u_info.pass = pass;
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authed_k5 = 0;
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got_k5 = k5_begin(&opts, &k5, &u_info);
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if (got_k5)
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{
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authed_k5 = k5_kinit(&opts, &k5, &u_info);
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k5_end(&k5);
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}
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return authed_k5;
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}
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/******************************************************************************/
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/* returns error */
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int DEFAULT_CC
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auth_start_session(void)
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{
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return 0;
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}
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/******************************************************************************/
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int DEFAULT_CC
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auth_end(void)
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{
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return 0;
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}
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/******************************************************************************/
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int DEFAULT_CC
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auth_set_env(void)
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{
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return 0;
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}
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