xref: /freebsd/crypto/heimdal/appl/afsutil/pagsh.c (revision 7aa383846770374466b1dcb2cefd71bde9acf463)
1 /*
2  * Copyright (c) 1995 - 2005 Kungliga Tekniska H�gskolan
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: pagsh.c 14574 2005-02-12 14:23:28Z lha $");
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 #ifdef KRB4
59 #include <krb.h>
60 #endif
61 #include <kafs.h>
62 
63 #include <err.h>
64 #include <roken.h>
65 #include <getarg.h>
66 
67 #ifndef TKT_ROOT
68 #define TKT_ROOT "/tmp/tkt"
69 #endif
70 
71 static int help_flag;
72 static int version_flag;
73 static int c_flag;
74 #ifdef KRB5
75 static char *typename_arg;
76 #endif
77 
78 struct getargs getargs[] = {
79     { NULL,	'c', arg_flag, &c_flag },
80 #ifdef KRB5
81     { "cache-type", 0,  arg_string, &typename_arg },
82 #endif
83     { "version", 0,  arg_flag, &version_flag },
84     { "help",	'h', arg_flag, &help_flag },
85 };
86 
87 static int num_args = sizeof(getargs) / sizeof(getargs[0]);
88 
89 static void
90 usage(int ecode)
91 {
92     arg_printusage(getargs, num_args, NULL, "command [args...]");
93     exit(ecode);
94 }
95 
96 /*
97  * Run command with a new ticket file / credentials cache / token
98  */
99 
100 int
101 main(int argc, char **argv)
102 {
103     int f;
104     char tf[1024];
105     char *p;
106 
107     char *path;
108     char **args;
109     int i;
110     int optind = 0;
111 
112     setprogname(argv[0]);
113     if(getarg(getargs, num_args, argc, argv, &optind))
114 	usage(1);
115     if(help_flag)
116 	usage(0);
117     if(version_flag) {
118 	print_version(NULL);
119 	exit(0);
120     }
121 
122     argc -= optind;
123     argv += optind;
124 
125 #ifdef KRB5
126     {
127 	const krb5_cc_ops *type;
128 	krb5_error_code ret;
129 	krb5_context context;
130 	krb5_ccache id;
131 	const char *name;
132 
133 	ret = krb5_init_context(&context);
134 	if (ret) /* XXX should this really call exit ? */
135 	    errx(1, "no kerberos 5 support");
136 
137 	if (typename_arg == NULL) {
138 	    char *s;
139 
140 	    name = krb5_cc_default_name(context);
141 	    if (name == NULL)
142 		krb5_errx(context, 1, "Failed getting default "
143 			  "credential cache type");
144 
145 	    typename_arg = strdup(name);
146 	    if (typename_arg == NULL)
147 		errx(1, "strdup");
148 
149 	    s = strchr(typename_arg, ':');
150 	    if (s)
151 		*s = '\0';
152 	}
153 
154 	type = krb5_cc_get_prefix_ops(context, typename_arg);
155 	if (type == NULL)
156 	    krb5_err(context, 1, ret, "Failed getting ops for %s "
157 		     "credential cache", typename_arg);
158 
159 	ret = krb5_cc_gen_new(context, type, &id);
160 	if (ret)
161 	    krb5_err(context, 1, ret, "Failed generating credential cache");
162 
163 	name = krb5_cc_get_name(context, id);
164 	if (name == NULL)
165 	    krb5_errx(context, 1, "Generated credential cache have no name");
166 
167 	snprintf(tf, sizeof(tf), "%s:%s", typename_arg, name);
168 
169 	ret = krb5_cc_close(context, id);
170 	if (ret)
171 	    krb5_err(context, 1, ret, "Failed closing credential cache");
172 
173 	krb5_free_context(context);
174 
175 	esetenv("KRB5CCNAME", tf, 1);
176     }
177 #endif
178 
179     snprintf (tf, sizeof(tf), "%s_XXXXXX", TKT_ROOT);
180     f = mkstemp (tf);
181     if (f < 0)
182 	err(1, "mkstemp failed");
183     close (f);
184     unlink (tf);
185     esetenv("KRBTKFILE", tf, 1);
186 
187     i = 0;
188 
189     args = (char **) malloc((argc + 10)*sizeof(char *));
190     if (args == NULL)
191 	errx (1, "Out of memory allocating %lu bytes",
192 	      (unsigned long)((argc + 10)*sizeof(char *)));
193 
194     if(*argv == NULL) {
195 	path = getenv("SHELL");
196 	if(path == NULL){
197 	    struct passwd *pw = k_getpwuid(geteuid());
198 	    path = strdup(pw->pw_shell);
199 	}
200     } else {
201 	path = strdup(*argv++);
202     }
203     if (path == NULL)
204 	errx (1, "Out of memory copying path");
205 
206     p=strrchr(path, '/');
207     if(p)
208 	args[i] = strdup(p+1);
209     else
210 	args[i] = strdup(path);
211 
212     if (args[i++] == NULL)
213 	errx (1, "Out of memory copying arguments");
214 
215     while(*argv)
216 	args[i++] = *argv++;
217 
218     args[i++] = NULL;
219 
220     if(k_hasafs())
221 	k_setpag();
222 
223     unsetenv("PAGPID");
224     execvp(path, args);
225     if (errno == ENOENT || c_flag) {
226 	char **sh_args = malloc ((i + 2) * sizeof(char *));
227 	int j;
228 
229 	if (sh_args == NULL)
230 	    errx (1, "Out of memory copying sh arguments");
231 	for (j = 1; j < i; ++j)
232 	    sh_args[j + 2] = args[j];
233 	sh_args[0] = "sh";
234 	sh_args[1] = "-c";
235 	sh_args[2] = path;
236 	execv ("/bin/sh", sh_args);
237     }
238     err (1, "execvp");
239 }
240