1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
28 /* All Rights Reserved */
29
30 /*
31 * logs attempts by unknown remote machines to run uucico in FOREIGN
32 * ("/var/uucp/.Admin/Foreign"). if anything goes wrong,
33 * sends mail to login MAILTO ("uucp"). the executable should be
34 * placed in /usr/lib/uucp/remote.unknown, and should run setuid-uucp.
35 */
36
37 #include <stdio.h>
38 #include <sys/types.h>
39 #include <time.h>
40 #include <errno.h>
41 #include "uucp.h"
42
43 #define FOREIGN "/var/uucp/.Admin/Foreign"
44 #define MAILTO "uucp"
45 #define LOGLEN 256
46
47 void fall_on_sword();
48
49 int
main(argc,argv)50 main(argc, argv)
51 int argc;
52 char *argv[];
53 {
54 char buf[LOGLEN], *ctoday, *logname, tmpbuf[MAXBASENAME+1];
55 FILE *fp;
56 time_t today;
57 extern char *ctime();
58 extern FILE *fopen();
59
60 if ( argc != 2 ) {
61 (void) fprintf(stderr, "USAGE: %s remotename\n", argv[0]);
62 exit(101);
63 }
64
65 if ( time(&today) != -1 ) {
66 ctoday = ctime(&today);
67 *(ctoday + strlen(ctoday) - 1) = '\0'; /* no ending \n */
68 } else
69 ctoday = "NO DATE";
70
71 logname = cuserid((char *) NULL);
72 (void) strncpy(tmpbuf, argv[1], MAXBASENAME);
73 tmpbuf[MAXBASENAME] = '\0';
74 (void) snprintf(buf, sizeof(buf), "%s: call from system %s login %s\n",
75 ctoday, tmpbuf, (logname == NULL ? "<unknown>" : logname));
76
77 errno = 0;
78 if ( (fp = fopen(FOREIGN, "a+")) == (FILE *)NULL )
79 fall_on_sword("cannot open", buf);
80 if ( fputs(buf, fp) == EOF )
81 fall_on_sword("cannot write", buf);
82 if ( fclose(fp) != 0 )
83 fall_on_sword("cannot close", buf);
84
85 return (0);
86 }
87
88 /* don't return from here */
89 void
fall_on_sword(errmsg,logmsg)90 fall_on_sword(errmsg, logmsg)
91 char *errmsg, *logmsg;
92 {
93 char ebuf[BUFSIZ+1];
94 int fds[2];
95 size_t sz;
96
97 (void) snprintf(ebuf, BUFSIZ,
98 "To: %s\nSubject: %s %s\n\n%s %s:\t%s (%d)\nlog msg:\t%s",
99 MAILTO, errmsg, FOREIGN, errmsg, FOREIGN,
100 strerror(errno), errno, logmsg);
101 sz = strlen(ebuf);
102 if (ebuf[sz-1] != '\n') {
103 ebuf[sz] = '\n';
104 ebuf[sz+1] = '\0';
105 }
106
107 /* reset to real uid. get a pipe. put error message on */
108 /* "write end" of pipe, close it. dup "read end" to */
109 /* stdin and then execl mail (which will read the error */
110 /* message we just wrote). */
111
112 if ( setuid(getuid()) == -1 || pipe(fds) != 0
113 || write(fds[1], ebuf, strlen(ebuf)) != strlen(ebuf)
114 || close(fds[1]) != 0 )
115 exit(errno);
116
117 if ( fds[0] != 0 ) {
118 close(0);
119 if ( dup(fds[0]) != 0 )
120 exit(errno);
121 }
122
123 execl("/usr/bin/mail", "mail", MAILTO, (char *) 0);
124 exit(errno); /* shouldn't get here */
125 }
126