appl/afsutil/pagsh.c

   1 /*
   2  * Copyright (c) 1995 - 2005 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifdef HAVE_CONFIG_H
  35 #include <config.h>
  36 #endif
  37
  38 RCSID("$Id$");
  39
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43 #include <unistd.h>
  44 #ifdef HAVE_SYS_TYPES_H
  45 #include <sys/types.h>
  46 #endif
  47 #include <time.h>
  48 #ifdef HAVE_FCNTL_H
  49 #include <fcntl.h>
  50 #endif
  51 #ifdef HAVE_PWD_H
  52 #include <pwd.h>
  53 #endif
  54
  55 #ifdef KRB5
  56 #include <krb5.h>
  57 #endif
  58 #include <kafs.h>
  59
  60 #include <err.h>
  61 #include <roken.h>
  62 #include <getarg.h>
  63
  64 #ifndef TKT_ROOT
  65 #define TKT_ROOT "/tmp/tkt"
  66 #endif
  67
  68 static int help_flag;
  69 static int version_flag;
  70 static int c_flag;
  71 #ifdef KRB5
  72 static char *typename_arg;
  73 #endif
  74
  75 struct getargs getargs[] = {
  76     { NULL,     'c', arg_flag, &c_flag },
  77 #ifdef KRB5
  78     { "cache-type", 0,  arg_string, &typename_arg },
  79 #endif
  80     { "version", 0,  arg_flag, &version_flag },
  81     { "help",   'h', arg_flag, &help_flag },
  82 };
  83
  84 static int num_args = sizeof(getargs) / sizeof(getargs[0]);
  85
  86 static void
  87 usage(int ecode)
  88 {
  89     arg_printusage(getargs, num_args, NULL, "command [args...]");
  90     exit(ecode);
  91 }
  92
  93 /*
  94  * Run command with a new ticket file / credentials cache / token
  95  */
  96
  97 int
  98 main(int argc, char **argv)
  99 {
 100     int f;
 101     char tf[1024];
 102     char *p;
 103
 104     char *path;
 105     char **args;
 106     unsigned int i;
 107     int optind = 0;
 108
 109     setprogname(argv[0]);
 110     if(getarg(getargs, num_args, argc, argv, &optind))
 111         usage(1);
 112     if(help_flag)
 113         usage(0);
 114     if(version_flag) {
 115         print_version(NULL);
 116         exit(0);
 117     }
 118
 119     argc -= optind;
 120     argv += optind;
 121
 122 #ifdef KRB5
 123     {
 124         krb5_error_code ret;
 125         krb5_context context;
 126         krb5_ccache id;
 127         const char *name;
 128
 129         ret = krb5_init_context(&context);
 130         if (ret) /* XXX should this really call exit ? */
 131             errx(1, "no kerberos 5 support");
 132
 133         ret = krb5_cc_new_unique(context, typename_arg, NULL, &id);
 134         if (ret)
 135             krb5_err(context, 1, ret, "Failed generating credential cache");
 136
 137         name = krb5_cc_get_name(context, id);
 138         if (name == NULL)
 139             krb5_errx(context, 1, "Generated credential cache have no name");
 140
 141         snprintf(tf, sizeof(tf), "%s:%s", typename_arg, name);
 142
 143         ret = krb5_cc_close(context, id);
 144         if (ret)
 145             krb5_err(context, 1, ret, "Failed closing credential cache");
 146
 147         krb5_free_context(context);
 148
 149         esetenv("KRB5CCNAME", tf, 1);
 150     }
 151 #endif
 152
 153     snprintf (tf, sizeof(tf), "%s_XXXXXX", TKT_ROOT);
 154     f = mkstemp (tf);
 155     if (f < 0)
 156         err(1, "mkstemp failed");
 157     close (f);
 158     unlink (tf);
 159     esetenv("KRBTKFILE", tf, 1);
 160
 161     i = 0;
 162
 163     args = (char **) malloc((argc + 10)*sizeof(char *));
 164     if (args == NULL)
 165         errx (1, "Out of memory allocating %lu bytes",
 166               (unsigned long)((argc + 10)*sizeof(char *)));
 167
 168     if(*argv == NULL) {
 169         path = getenv("SHELL");
 170         if(path == NULL){
 171             struct passwd *pw = k_getpwuid(geteuid());
 172             if (pw == NULL)
 173                 errx(1, "no such user: %d", (int)geteuid());
 174             path = strdup(pw->pw_shell);
 175         }
 176     } else {
 177         path = strdup(*argv++);
 178     }
 179     if (path == NULL)
 180         errx (1, "Out of memory copying path");
 181
 182     p=strrchr(path, '/');
 183     if(p)
 184         args[i] = strdup(p+1);
 185     else
 186         args[i] = strdup(path);
 187
 188     if (args[i++] == NULL)
 189         errx (1, "Out of memory copying arguments");
 190
 191     while(*argv)
 192         args[i++] = *argv++;
 193
 194     args[i++] = NULL;
 195
 196     if(k_hasafs())
 197         k_setpag();
 198
 199     unsetenv("PAGPID");
 200     execvp(path, args);
 201     if (errno == ENOENT || c_flag) {
 202         char **sh_args = malloc ((i + 2) * sizeof(char *));
 203         unsigned int j;
 204
 205         if (sh_args == NULL)
 206             errx (1, "Out of memory copying sh arguments");
 207         for (j = 1; j < i; ++j)
 208             sh_args[j + 2] = args[j];
 209         sh_args[0] = "sh";
 210         sh_args[1] = "-c";
 211         sh_args[2] = path;
 212         execv ("/bin/sh", sh_args);
 213     }
 214     err (1, "execvp");
 215 }