Annotation of src/usr.bin/skeyaudit/skeyaudit.c, Revision 1.16
1.16 ! millert 1: /* $OpenBSD: skeyaudit.c,v 1.15 2003/03/14 04:29:04 millert Exp $ */
1.2 millert 2:
3: /*
1.9 millert 4: * Copyright (c) 1997, 2000 Todd C. Miller <Todd.Miller@courtesan.com>
1.2 millert 5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
1.8 millert 15: * 3. The name of the author may not be used to endorse or promote products
1.2 millert 16: * derived from this software without specific prior written permission.
17: *
18: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
19: * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
20: * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
21: * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
27: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28: */
29:
1.9 millert 30: #include <sys/param.h>
31: #include <sys/wait.h>
32:
1.1 millert 33: #include <err.h>
34: #include <errno.h>
35: #include <limits.h>
1.9 millert 36: #include <login_cap.h>
1.1 millert 37: #include <paths.h>
38: #include <pwd.h>
39: #include <stdio.h>
40: #include <stdlib.h>
41: #include <string.h>
42: #include <unistd.h>
43: #include <skey.h>
44:
1.12 millert 45: void notify(struct passwd *, int, int);
46: FILE *runsendmail(struct passwd *, int *);
1.14 millert 47: __dead void usage(void);
1.1 millert 48:
49: int
1.14 millert 50: main(int argc, char **argv)
1.1 millert 51: {
52: struct passwd *pw;
53: struct skey key;
1.6 millert 54: char *name;
1.14 millert 55: int ch, left, aflag, iflag, limit;
1.6 millert 56:
1.14 millert 57: left = aflag = iflag = 0;
58: limit = 12;
1.6 millert 59: while ((ch = getopt(argc, argv, "ail:")) != -1)
1.1 millert 60: switch(ch) {
1.6 millert 61: case 'a':
62: if (getuid() != 0)
63: errx(1, "only root may use the -a flag");
1.14 millert 64: aflag = 1;
1.6 millert 65: break;
1.1 millert 66: case 'i':
67: iflag = 1;
68: break;
69: case 'l':
70: errno = 0;
71: if ((limit = (int)strtol(optarg, NULL, 10)) == 0)
72: errno = ERANGE;
73: if (errno) {
74: warn("key limit");
75: usage();
76: }
77: break;
78: default:
79: usage();
80: }
81:
82: if (argc - optind > 0)
83: usage();
84:
1.6 millert 85: /* Need key.keyfile zero'd at the very least */
86: (void)memset(&key, 0, sizeof(key));
87:
88: if (aflag) {
89: while ((ch = skeygetnext(&key)) == 0) {
1.1 millert 90: left = key.n - 1;
1.6 millert 91: if ((pw = getpwnam(key.logname)) == NULL)
92: continue;
93: if (left >= limit)
94: continue;
1.9 millert 95: notify(pw, left, iflag);
1.6 millert 96: }
97: if (ch == -1)
1.13 millert 98: errx(-1, "cannot open %s", _PATH_SKEYDIR);
1.6 millert 99: } else {
100: if ((pw = getpwuid(getuid())) == NULL)
101: errx(1, "no passwd entry for uid %u", getuid());
102: if ((name = strdup(pw->pw_name)) == NULL)
103: err(1, "cannot allocate memory");
104: sevenbit(name);
105:
1.14 millert 106: switch (skeylookup(&key, name)) {
1.6 millert 107: case 0: /* Success! */
108: left = key.n - 1;
109: break;
110: case -1: /* File error */
1.14 millert 111: errx(1, "cannot open %s/%s", _PATH_SKEYDIR,
112: name);
1.6 millert 113: break;
114: case 1: /* Unknown user */
1.14 millert 115: errx(1, "user %s is not listed in %s", name,
1.13 millert 116: _PATH_SKEYDIR);
1.6 millert 117: }
118: (void)fclose(key.keyfile);
119:
1.14 millert 120: if (left < limit)
1.9 millert 121: notify(pw, left, iflag);
1.1 millert 122: }
1.6 millert 123:
1.14 millert 124: exit(0);
1.6 millert 125: }
1.1 millert 126:
1.6 millert 127: void
1.14 millert 128: notify(struct passwd *pw, int seq, int interactive)
1.6 millert 129: {
130: static char hostname[MAXHOSTNAMELEN];
1.14 millert 131: pid_t pid;
1.6 millert 132: FILE *out;
1.1 millert 133:
1.6 millert 134: /* Only set this once */
135: if (hostname[0] == '\0' && gethostname(hostname, sizeof(hostname)) == -1)
1.15 millert 136: strlcpy(hostname, "unknown", sizeof(hostname));
1.1 millert 137:
1.6 millert 138: if (interactive)
1.1 millert 139: out = stdout;
1.6 millert 140: else
1.9 millert 141: out = runsendmail(pw, &pid);
1.1 millert 142:
1.6 millert 143: if (!interactive)
1.1 millert 144: (void)fprintf(out,
1.9 millert 145: "To: %s\nSubject: IMPORTANT action required\n", pw->pw_name);
1.1 millert 146:
1.10 pjanzen 147: if (seq)
148: (void)fprintf(out,
1.1 millert 149: "\nYou are nearing the end of your current S/Key sequence for account\n\
150: %s on system %s.\n\n\
1.10 pjanzen 151: Your S/Key sequence number is now %d. When it reaches zero\n\
152: you will no longer be able to use S/Key to log into the system.\n\n",
1.9 millert 153: pw->pw_name, hostname, seq);
1.10 pjanzen 154: else
155: (void)fprintf(out,
156: "\nYou are at the end of your current S/Key sequence for account\n\
157: %s on system %s.\n\n\
158: At this point you can no longer use S/Key to log into the system.\n\n",
159: pw->pw_name, hostname);
160: (void)fprintf(out,
161: "Type \"skeyinit -s\" to reinitialize your sequence number.\n\n");
1.1 millert 162:
1.6 millert 163: (void)fclose(out);
164: if (!interactive)
165: (void)waitpid(pid, NULL, 0);
1.1 millert 166: }
167:
1.6 millert 168: FILE *
1.14 millert 169: runsendmail(struct passwd *pw, pid_t *pidp)
1.6 millert 170: {
171: FILE *fp;
1.14 millert 172: int pfd[2];
173: pid_t pid;
1.6 millert 174:
175: if (pipe(pfd) < 0)
176: return(NULL);
177:
178: switch (pid = fork()) {
179: case -1: /* fork(2) failed */
180: (void)close(pfd[0]);
181: (void)close(pfd[1]);
182: return(NULL);
183: case 0: /* In child */
184: (void)close(pfd[1]);
185: (void)dup2(pfd[0], STDIN_FILENO);
186: (void)close(pfd[0]);
187:
188: /* Run sendmail as target user not root */
1.9 millert 189: if (setusercontext(NULL, pw, pw->pw_uid, LOGIN_SETALL) != 0) {
190: warn("cannot set user context");
191: _exit(127);
192: }
1.6 millert 193:
1.11 deraadt 194: execl(_PATH_SENDMAIL, "sendmail", "-t", (char *)NULL);
1.6 millert 195: warn("cannot run \"%s -t\"", _PATH_SENDMAIL);
196: _exit(127);
197: }
198:
199: /* In parent */
200: *pidp = pid;
201: fp = fdopen(pfd[1], "w");
202: (void)close(pfd[0]);
203:
204: return(fp);
205: }
1.14 millert 206:
207: __dead void
208: usage(void)
1.1 millert 209: {
1.14 millert 210: extern char *__progname;
211:
1.1 millert 212: (void)fprintf(stderr, "Usage: %s [-i] [-l limit]\n",
213: __progname);
214: exit(1);
215: }
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