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kinit.c

/*
 * Copyright (c) 1997-2002 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden). 
 * All rights reserved. 
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 *
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in the 
 *    documentation and/or other materials provided with the distribution. 
 *
 * 3. Neither the name of the Institute nor the names of its contributors 
 *    may be used to endorse or promote products derived from this software 
 *    without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE. 
 */

#include "kuser_locl.h"
RCSID("$Id: kinit.c,v 1.90.4.5 2004/06/21 08:17:06 lha Exp $");

int forwardable_flag    = -1;
int proxiable_flag      = -1;
int renewable_flag      = -1;
int renew_flag          = 0;
int validate_flag = 0;
int version_flag  = 0;
int help_flag           = 0;
int addrs_flag          = 1;
struct getarg_strings extra_addresses;
int anonymous_flag      = 0;
char *lifetime          = NULL;
char *renew_life  = NULL;
char *server            = NULL;
char *cred_cache  = NULL;
char *start_str         = NULL;
struct getarg_strings etype_str;
int use_keytab          = 0;
char *keytab_str  = NULL;
int do_afslog           = -1;
#ifdef KRB4
int get_v4_tgt          = -1;
int convert_524;
#endif
int fcache_version;

static struct getargs args[] = {
#ifdef KRB4
    { "524init",  '4', arg_flag, &get_v4_tgt,
      "obtain version 4 TGT" },
    
    { "524convert",     '9', arg_flag, &convert_524,
      "only convert ticket to version 4" },
#endif
    { "afslog",   0  , arg_flag, &do_afslog,
      "obtain afs tokens"  },

    { "cache",          'c', arg_string, &cred_cache,
      "credentials cache", "cachename" },

    { "forwardable",    'f', arg_flag, &forwardable_flag,
      "get forwardable tickets"},

    { "keytab",         't', arg_string, &keytab_str,
      "keytab to use", "keytabname" },

    { "lifetime", 'l', arg_string, &lifetime,
      "lifetime of tickets", "time"},

    { "proxiable",      'p', arg_flag, &proxiable_flag,
      "get proxiable tickets" },

    { "renew",          'R', arg_flag, &renew_flag,
      "renew TGT" },

    { "renewable",      0,   arg_flag, &renewable_flag,
      "get renewable tickets" },

    { "renewable-life", 'r', arg_string, &renew_life,
      "renewable lifetime of tickets", "time" },

    { "server",   'S', arg_string, &server,
      "server to get ticket for", "principal" },

    { "start-time",     's', arg_string, &start_str,
      "when ticket gets valid", "time" },

    { "use-keytab",     'k', arg_flag, &use_keytab,
      "get key from keytab" },

    { "validate", 'v', arg_flag, &validate_flag,
      "validate TGT" },

    { "enctypes", 'e', arg_strings, &etype_str,
      "encryption types to use", "enctypes" },

    { "fcache-version", 0,   arg_integer, &fcache_version,
      "file cache version to create" },

    { "addresses",      0,   arg_negative_flag, &addrs_flag,
      "request a ticket with no addresses" },

    { "extra-addresses",'a', arg_strings, &extra_addresses,
      "include these extra addresses", "addresses" },

    { "anonymous",      0,   arg_flag,    &anonymous_flag,
      "request an anonymous ticket" },

    { "version",  0,   arg_flag, &version_flag },
    { "help",           0,   arg_flag, &help_flag }
};

static void
usage (int ret)
{
    arg_printusage (args,
                sizeof(args)/sizeof(*args),
                NULL,
                "[principal [command]]");
    exit (ret);
}

#ifdef KRB4
/* for when the KDC tells us it's a v4 one, we try to talk that */

static int
key_to_key(const char *user,
         char *instance,
         const char *realm,
         const void *arg,
         des_cblock *key)
{
    memcpy(key, arg, sizeof(des_cblock));
    return 0;
}

static int
do_v4_fallback (krb5_context context,
            const krb5_principal principal,
            int lifetime,
            int use_srvtab, const char *srvtab_str,
            const char *passwd)
{
    int ret;
    krb_principal princ;
    des_cblock key;
    krb5_error_code kret;

    if (lifetime == 0)
      lifetime = DEFAULT_TKT_LIFE;
    else
      lifetime = krb_time_to_life (0, lifetime);

    kret = krb5_524_conv_principal (context, principal,
                            princ.name,
                            princ.instance,
                            princ.realm);
    if (kret) {
      krb5_warn (context, kret, "krb5_524_conv_principal");
      return 1;
    }

    if (use_srvtab || srvtab_str) {
      if (srvtab_str == NULL)
          srvtab_str = KEYFILE;

      ret = read_service_key (princ.name, princ.instance, princ.realm,
                        0, srvtab_str, (char *)&key);
      if (ret) {
          warnx ("read_service_key %s: %s", srvtab_str,
               krb_get_err_text (ret));
          return 1;
      }
      ret = krb_get_in_tkt (princ.name, princ.instance, princ.realm,
                        KRB_TICKET_GRANTING_TICKET, princ.realm,
                        lifetime, key_to_key, NULL, key);
    } else {
      ret = krb_get_pw_in_tkt(princ.name, princ.instance, princ.realm, 
                        KRB_TICKET_GRANTING_TICKET, princ.realm, 
                        lifetime, passwd);
    }
    memset (key, 0, sizeof(key));
    if (ret) {
      warnx ("%s", krb_get_err_text(ret));
      return 1;
    }
    if (do_afslog && k_hasafs()) {
      if ((ret = krb_afslog(NULL, NULL)) != 0 && ret != KDC_PR_UNKNOWN) {
          if(ret > 0)
            warnx ("%s", krb_get_err_text(ret));
          else
            warnx ("failed to store AFS token");
      }
    }
    return 0;
}


/*
 * the special version of get_default_principal that takes v4 into account
 */

static krb5_error_code
kinit_get_default_principal (krb5_context context,
                       krb5_principal *princ)
{
    krb5_error_code ret;
    krb5_ccache id;
    krb_principal v4_princ;
    int kret;

    ret = krb5_cc_default (context, &id);
    if (ret == 0) {
      ret = krb5_cc_get_principal (context, id, princ);
      krb5_cc_close (context, id);
      if (ret == 0)
          return 0;
    }

    kret = krb_get_tf_fullname (tkt_string(),
                        v4_princ.name,
                        v4_princ.instance,
                        v4_princ.realm);
    if (kret == KSUCCESS) {
      ret = krb5_425_conv_principal (context,
                               v4_princ.name,
                               v4_princ.instance,
                               v4_princ.realm,
                               princ);
      if (ret == 0)
          return 0;
    }
    return krb5_get_default_principal (context, princ);
}

#else /* !KRB4 */

static krb5_error_code
kinit_get_default_principal (krb5_context context,
                       krb5_principal *princ)
{
    return krb5_get_default_principal (context, princ);
}

#endif /* !KRB4 */

static krb5_error_code
get_server(krb5_context context,
         krb5_principal client,
         const char *server,
         krb5_principal *princ)
{
    krb5_realm *client_realm;
    if(server)
      return krb5_parse_name(context, server, princ);

    client_realm = krb5_princ_realm (context, client);
    return krb5_make_principal(context, princ, *client_realm,
                         KRB5_TGS_NAME, *client_realm, NULL);
}

#ifdef KRB4
static krb5_error_code
do_524init(krb5_context context, krb5_ccache ccache, 
         krb5_creds *creds, const char *server)
{
    krb5_error_code ret;
    CREDENTIALS c;
    krb5_creds in_creds, *real_creds;

    if(creds != NULL)
      real_creds = creds;
    else {
      krb5_principal client;
      krb5_cc_get_principal(context, ccache, &client);
      memset(&in_creds, 0, sizeof(in_creds));
      ret = get_server(context, client, server, &in_creds.server);
      if(ret) {
          krb5_free_principal(context, client);
          return ret;
      }
      in_creds.client = client;
      ret = krb5_get_credentials(context, 0, ccache, &in_creds, &real_creds);
      krb5_free_principal(context, client);
      krb5_free_principal(context, in_creds.server);
      if(ret)
          return ret;
    }
    ret = krb524_convert_creds_kdc_ccache(context, ccache, real_creds, &c);
    if(ret)
      krb5_warn(context, ret, "converting creds");
    else {
      int tret = tf_setup(&c, c.pname, c.pinst);
      if(tret)
          krb5_warnx(context, "saving v4 creds: %s", krb_get_err_text(tret));
    }

    if(creds == NULL)
      krb5_free_creds(context, real_creds);
    memset(&c, 0, sizeof(c));

    return ret;
}
#endif

static int
renew_validate(krb5_context context, 
             int renew,
             int validate,
             krb5_ccache cache, 
             const char *server,
             krb5_deltat life)
{
    krb5_error_code ret;
    krb5_creds in, *out;
    krb5_kdc_flags flags;

    memset(&in, 0, sizeof(in));

    ret = krb5_cc_get_principal(context, cache, &in.client);
    if(ret) {
      krb5_warn(context, ret, "krb5_cc_get_principal");
      return ret;
    }
    ret = get_server(context, in.client, server, &in.server);
    if(ret) {
      krb5_warn(context, ret, "get_server");
      goto out;
    }
    flags.i = 0;
    flags.b.renewable         = flags.b.renew = renew;
    flags.b.validate          = validate;
    if (forwardable_flag != -1)
      flags.b.forwardable       = forwardable_flag;
    if (proxiable_flag != -1)
      flags.b.proxiable         = proxiable_flag;
    if (anonymous_flag != -1)
      flags.b.request_anonymous = anonymous_flag;
    if(life)
      in.times.endtime = time(NULL) + life;

    ret = krb5_get_kdc_cred(context,
                      cache,
                      flags,
                      NULL,
                      NULL,
                      &in,
                      &out);
    if(ret) {
      krb5_warn(context, ret, "krb5_get_kdc_cred");
      goto out;
    }
    ret = krb5_cc_initialize(context, cache, in.client);
    if(ret) {
      krb5_free_creds (context, out);
      krb5_warn(context, ret, "krb5_cc_initialize");
      goto out;
    }
    ret = krb5_cc_store_cred(context, cache, out);

    if(ret == 0 && server == NULL) {
#ifdef KRB4
      /* only do this if it's a general renew-my-tgt request */
      if(get_v4_tgt)
          do_524init(context, cache, out, NULL);
#endif
      if(do_afslog && k_hasafs())
          krb5_afslog(context, cache, NULL, NULL);
    }

    krb5_free_creds (context, out);
    if(ret) {
      krb5_warn(context, ret, "krb5_cc_store_cred");
      goto out;
    }
out:
    krb5_free_creds_contents(context, &in);
    return ret;
}

static krb5_error_code
get_new_tickets(krb5_context context, 
            krb5_principal principal,
            krb5_ccache ccache,
            krb5_deltat ticket_life)
{
    krb5_error_code ret;
    krb5_get_init_creds_opt opt;
    krb5_addresses no_addrs;
    krb5_creds cred;
    char passwd[256];
    krb5_deltat start_time = 0;
    krb5_deltat renew = 0;

    memset(&cred, 0, sizeof(cred));

    krb5_get_init_creds_opt_init (&opt);
    
    krb5_get_init_creds_opt_set_default_flags(context, "kinit", 
                                    /* XXX */principal->realm, &opt);

    if(forwardable_flag != -1)
      krb5_get_init_creds_opt_set_forwardable (&opt, forwardable_flag);
    if(proxiable_flag != -1)
      krb5_get_init_creds_opt_set_proxiable (&opt, proxiable_flag);
    if(anonymous_flag != -1)
      krb5_get_init_creds_opt_set_anonymous (&opt, anonymous_flag);

    if (!addrs_flag) {
      no_addrs.len = 0;
      no_addrs.val = NULL;

      krb5_get_init_creds_opt_set_address_list (&opt, &no_addrs);
    }

    if (renew_life == NULL && renewable_flag)
      renew_life = "1 month";
    if(renew_life) {
      renew = parse_time (renew_life, "s");
      if (renew < 0)
          errx (1, "unparsable time: %s", renew_life);

      krb5_get_init_creds_opt_set_renew_life (&opt, renew);
    }

    if(ticket_life != 0)
      krb5_get_init_creds_opt_set_tkt_life (&opt, ticket_life);

    if(start_str) {
      int tmp = parse_time (start_str, "s");
      if (tmp < 0)
          errx (1, "unparsable time: %s", start_str);

      start_time = tmp;
    }

    if(etype_str.num_strings) {
      krb5_enctype *enctype = NULL;
      int i;
      enctype = malloc(etype_str.num_strings * sizeof(*enctype));
      if(enctype == NULL)
          errx(1, "out of memory");
      for(i = 0; i < etype_str.num_strings; i++) {
          ret = krb5_string_to_enctype(context, 
                               etype_str.strings[i], 
                               &enctype[i]);
          if(ret)
            errx(1, "unrecognized enctype: %s", etype_str.strings[i]);
      }
      krb5_get_init_creds_opt_set_etype_list(&opt, enctype, 
                                     etype_str.num_strings);
    }

    if(use_keytab || keytab_str) {
      krb5_keytab kt;
      if(keytab_str)
          ret = krb5_kt_resolve(context, keytab_str, &kt);
      else
          ret = krb5_kt_default(context, &kt);
      if (ret)
          krb5_err (context, 1, ret, "resolving keytab");
      ret = krb5_get_init_creds_keytab (context,
                                &cred,
                                principal,
                                kt,
                                start_time,
                                server,
                                &opt);
      krb5_kt_close(context, kt);
    } else {
      char *p, *prompt;

      krb5_unparse_name (context, principal, &p);
      asprintf (&prompt, "%s's Password: ", p);
      free (p);

      if (des_read_pw_string(passwd, sizeof(passwd)-1, prompt, 0)){
          memset(passwd, 0, sizeof(passwd));
          exit(1);
      }

      free (prompt);

      ret = krb5_get_init_creds_password (context,
                                  &cred,
                                  principal,
                                  passwd,
                                  krb5_prompter_posix,
                                  NULL,
                                  start_time,
                                  server,
                                  &opt);
    }
#ifdef KRB4
    if (ret == KRB5KRB_AP_ERR_V4_REPLY || ret == KRB5_KDC_UNREACH) {
      int exit_val;

      exit_val = do_v4_fallback (context, principal, ticket_life,
                           use_keytab, keytab_str, passwd);
      get_v4_tgt = 0;
      do_afslog  = 0;
      memset(passwd, 0, sizeof(passwd));
      if (exit_val == 0 || ret == KRB5KRB_AP_ERR_V4_REPLY)
          return exit_val;
    }
#endif
    memset(passwd, 0, sizeof(passwd));

    switch(ret){
    case 0:
      break;
    case KRB5_LIBOS_PWDINTR: /* don't print anything if it was just C-c:ed */
      exit(1);
    case KRB5KRB_AP_ERR_BAD_INTEGRITY:
    case KRB5KRB_AP_ERR_MODIFIED:
      krb5_errx(context, 1, "Password incorrect");
      break;
    default:
      krb5_err(context, 1, ret, "krb5_get_init_creds");
    }

    if(ticket_life != 0) {
      if(abs(cred.times.endtime - cred.times.starttime - ticket_life) > 30) {
          char life[32];
          unparse_time(cred.times.endtime - cred.times.starttime, 
                   life, sizeof(life));
          krb5_warnx(context, "NOTICE: ticket lifetime is %s", life);
      }
    }
    if(renew != 0) {
      if(abs(cred.times.renew_till - cred.times.starttime - renew) > 30) {
          char life[32];
          unparse_time(cred.times.renew_till - cred.times.starttime, 
                   life, sizeof(life));
          krb5_warnx(context, "NOTICE: ticket renewable lifetime is %s", 
                   life);
      }
    }

    ret = krb5_cc_initialize (context, ccache, cred.client);
    if (ret)
      krb5_err (context, 1, ret, "krb5_cc_initialize");
    
    ret = krb5_cc_store_cred (context, ccache, &cred);
    if (ret)
      krb5_err (context, 1, ret, "krb5_cc_store_cred");

    krb5_free_creds_contents (context, &cred);

    return 0;
}

int
main (int argc, char **argv)
{
    krb5_error_code ret;
    krb5_context context;
    krb5_ccache  ccache;
    krb5_principal principal;
    int optind = 0;
    krb5_deltat ticket_life = 0;

    setprogname (argv[0]);
    
    ret = krb5_init_context (&context);
    if (ret)
      errx(1, "krb5_init_context failed: %d", ret);
  
    if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optind))
      usage(1);
    
    if (help_flag)
      usage (0);

    if(version_flag) {
      print_version(NULL);
      exit(0);
    }

    argc -= optind;
    argv += optind;

    if (argv[0]) {
      ret = krb5_parse_name (context, argv[0], &principal);
      if (ret)
          krb5_err (context, 1, ret, "krb5_parse_name");
    } else {
      ret = kinit_get_default_principal (context, &principal);
      if (ret)
          krb5_err (context, 1, ret, "krb5_get_default_principal");
    }

    if(fcache_version)
      krb5_set_fcache_version(context, fcache_version);

    if(cred_cache) 
      ret = krb5_cc_resolve(context, cred_cache, &ccache);
    else {
      if(argc > 1) {
          char s[1024];
          ret = krb5_cc_gen_new(context, &krb5_fcc_ops, &ccache);
          if(ret)
            krb5_err(context, 1, ret, "creating cred cache");
          snprintf(s, sizeof(s), "%s:%s",
                 krb5_cc_get_type(context, ccache),
                 krb5_cc_get_name(context, ccache));
          setenv("KRB5CCNAME", s, 1);
#ifdef KRB4
          {
            int fd;
            snprintf(s, sizeof(s), "%s_XXXXXX", TKT_ROOT);
            if((fd = mkstemp(s)) >= 0) {
                close(fd);
                setenv("KRBTKFILE", s, 1);
            }
          }
#endif
      } else
          ret = krb5_cc_default (context, &ccache);
    }
    if (ret)
      krb5_err (context, 1, ret, "resolving credentials cache");

    if (argc > 1 && k_hasafs ())
      k_setpag();

    if (lifetime) {
      int tmp = parse_time (lifetime, "s");
      if (tmp < 0)
          errx (1, "unparsable time: %s", lifetime);

      ticket_life = tmp;
    }
#ifdef KRB4
    if(get_v4_tgt == -1)
      krb5_appdefault_boolean(context, "kinit", 
                        krb5_principal_get_realm(context, principal), 
                        "krb4_get_tickets", TRUE, &get_v4_tgt);
#endif
    if(do_afslog == -1)
      krb5_appdefault_boolean(context, "kinit", 
                        krb5_principal_get_realm(context, principal), 
                        "afslog", TRUE, &do_afslog);

    if(!addrs_flag && extra_addresses.num_strings > 0)
      krb5_errx(context, 1, "specifying both extra addresses and "
              "no addresses makes no sense");
    {
      int i;
      krb5_addresses addresses;
      memset(&addresses, 0, sizeof(addresses));
      for(i = 0; i < extra_addresses.num_strings; i++) {
          ret = krb5_parse_address(context, extra_addresses.strings[i], 
                             &addresses);
          if (ret == 0) {
            krb5_add_extra_addresses(context, &addresses);
            krb5_free_addresses(context, &addresses);
          }
      }
      free_getarg_strings(&extra_addresses);
    }

    
    if(renew_flag || validate_flag) {
      ret = renew_validate(context, renew_flag, validate_flag, 
                       ccache, server, ticket_life);
      exit(ret != 0);
    }

#ifdef KRB4
    if(!convert_524)
#endif
      get_new_tickets(context, principal, ccache, ticket_life);

#ifdef KRB4
    if(get_v4_tgt)
      do_524init(context, ccache, NULL, server);
#endif
    if(do_afslog && k_hasafs())
      krb5_afslog(context, ccache, NULL, NULL);
    if(argc > 1) {
      ret = simple_execvp(argv[1], argv+1);
      krb5_cc_destroy(context, ccache);
#ifdef KRB4
      dest_tkt();
#endif
      if(k_hasafs())
          k_unlog();
    } else {
      krb5_cc_close (context, ccache);
      ret = 0;
    }
    krb5_free_principal(context, principal);
    krb5_free_context (context);
    return ret;
}

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