Annotation of src/usr.bin/skeyaudit/skeyaudit.c, Revision 1.24
1.24 ! sobrado 1: /* $OpenBSD: skeyaudit.c,v 1.23 2006/12/11 20:50:54 deraadt Exp $ */
1.2 millert 2:
3: /*
1.17 millert 4: * Copyright (c) 1997, 2000, 2003 Todd C. Miller <Todd.Miller@courtesan.com>
1.2 millert 5: *
1.20 millert 6: * Permission to use, copy, modify, and distribute this software for any
7: * purpose with or without fee is hereby granted, provided that the above
8: * copyright notice and this permission notice appear in all copies.
1.2 millert 9: *
1.20 millert 10: * THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL
11: * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
12: * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE
13: * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
15: * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
16: * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.17 millert 17: *
18: * Sponsored in part by the Defense Advanced Research Projects
19: * Agency (DARPA) and Air Force Research Laboratory, Air Force
20: * Materiel Command, USAF, under agreement number F39502-99-1-0512.
1.2 millert 21: */
22:
1.9 millert 23: #include <sys/param.h>
24: #include <sys/wait.h>
25:
1.1 millert 26: #include <err.h>
27: #include <errno.h>
1.17 millert 28: #include <fcntl.h>
1.1 millert 29: #include <limits.h>
1.9 millert 30: #include <login_cap.h>
1.1 millert 31: #include <paths.h>
32: #include <pwd.h>
33: #include <stdio.h>
34: #include <stdlib.h>
35: #include <string.h>
36: #include <unistd.h>
37: #include <skey.h>
38:
1.12 millert 39: void notify(struct passwd *, int, int);
40: FILE *runsendmail(struct passwd *, int *);
1.14 millert 41: __dead void usage(void);
1.1 millert 42:
43: int
1.14 millert 44: main(int argc, char **argv)
1.1 millert 45: {
46: struct passwd *pw;
47: struct skey key;
1.6 millert 48: char *name;
1.14 millert 49: int ch, left, aflag, iflag, limit;
1.6 millert 50:
1.17 millert 51: aflag = iflag = 0;
1.14 millert 52: limit = 12;
1.6 millert 53: while ((ch = getopt(argc, argv, "ail:")) != -1)
1.1 millert 54: switch(ch) {
1.6 millert 55: case 'a':
56: if (getuid() != 0)
57: errx(1, "only root may use the -a flag");
1.14 millert 58: aflag = 1;
1.6 millert 59: break;
1.1 millert 60: case 'i':
61: iflag = 1;
62: break;
63: case 'l':
64: errno = 0;
65: if ((limit = (int)strtol(optarg, NULL, 10)) == 0)
66: errno = ERANGE;
67: if (errno) {
68: warn("key limit");
69: usage();
70: }
71: break;
72: default:
73: usage();
74: }
75:
1.17 millert 76: /*
77: * Make sure STDIN_FILENO, STDOUT_FILENO, and STDERR_FILENO are open.
78: * If not, open /dev/null in their place or bail.
79: * If we are in interactive mode, STDOUT_FILENO *must* be open.
80: */
81: for (ch = STDIN_FILENO; ch <= STDERR_FILENO; ch++) {
1.22 millert 82: if (fcntl(ch, F_GETFL, 0) == -1 && errno == EBADF) {
1.17 millert 83: if (ch == STDOUT_FILENO && iflag)
84: exit(1); /* need stdout for -i */
85: if (open(_PATH_DEVNULL, O_RDWR, 0644) == -1)
86: exit(1); /* just bail */
87: }
88: }
89:
1.1 millert 90: if (argc - optind > 0)
91: usage();
92:
1.6 millert 93: /* Need key.keyfile zero'd at the very least */
94: (void)memset(&key, 0, sizeof(key));
95:
1.17 millert 96: left = 0;
1.6 millert 97: if (aflag) {
98: while ((ch = skeygetnext(&key)) == 0) {
1.1 millert 99: left = key.n - 1;
1.6 millert 100: if ((pw = getpwnam(key.logname)) == NULL)
101: continue;
102: if (left >= limit)
103: continue;
1.17 millert 104: (void)fclose(key.keyfile);
105: key.keyfile = NULL;
1.9 millert 106: notify(pw, left, iflag);
1.6 millert 107: }
108: if (ch == -1)
1.13 millert 109: errx(-1, "cannot open %s", _PATH_SKEYDIR);
1.6 millert 110: } else {
111: if ((pw = getpwuid(getuid())) == NULL)
112: errx(1, "no passwd entry for uid %u", getuid());
113: if ((name = strdup(pw->pw_name)) == NULL)
114: err(1, "cannot allocate memory");
115: sevenbit(name);
116:
1.14 millert 117: switch (skeylookup(&key, name)) {
1.6 millert 118: case 0: /* Success! */
119: left = key.n - 1;
120: break;
121: case -1: /* File error */
1.14 millert 122: errx(1, "cannot open %s/%s", _PATH_SKEYDIR,
123: name);
1.6 millert 124: break;
125: case 1: /* Unknown user */
1.14 millert 126: errx(1, "user %s is not listed in %s", name,
1.13 millert 127: _PATH_SKEYDIR);
1.6 millert 128: }
129: (void)fclose(key.keyfile);
130:
1.14 millert 131: if (left < limit)
1.9 millert 132: notify(pw, left, iflag);
1.1 millert 133: }
1.6 millert 134:
1.14 millert 135: exit(0);
1.6 millert 136: }
1.1 millert 137:
1.6 millert 138: void
1.14 millert 139: notify(struct passwd *pw, int seq, int interactive)
1.6 millert 140: {
141: static char hostname[MAXHOSTNAMELEN];
1.14 millert 142: pid_t pid;
1.6 millert 143: FILE *out;
1.1 millert 144:
1.6 millert 145: /* Only set this once */
146: if (hostname[0] == '\0' && gethostname(hostname, sizeof(hostname)) == -1)
1.15 millert 147: strlcpy(hostname, "unknown", sizeof(hostname));
1.1 millert 148:
1.6 millert 149: if (interactive)
1.1 millert 150: out = stdout;
1.6 millert 151: else
1.9 millert 152: out = runsendmail(pw, &pid);
1.1 millert 153:
1.6 millert 154: if (!interactive)
1.1 millert 155: (void)fprintf(out,
1.23 deraadt 156: "Auto-Submitted: auto-generated\n"
1.9 millert 157: "To: %s\nSubject: IMPORTANT action required\n", pw->pw_name);
1.1 millert 158:
1.10 pjanzen 159: if (seq)
160: (void)fprintf(out,
1.1 millert 161: "\nYou are nearing the end of your current S/Key sequence for account\n\
162: %s on system %s.\n\n\
1.10 pjanzen 163: Your S/Key sequence number is now %d. When it reaches zero\n\
164: you will no longer be able to use S/Key to log into the system.\n\n",
1.9 millert 165: pw->pw_name, hostname, seq);
1.10 pjanzen 166: else
167: (void)fprintf(out,
168: "\nYou are at the end of your current S/Key sequence for account\n\
169: %s on system %s.\n\n\
170: At this point you can no longer use S/Key to log into the system.\n\n",
171: pw->pw_name, hostname);
172: (void)fprintf(out,
173: "Type \"skeyinit -s\" to reinitialize your sequence number.\n\n");
1.1 millert 174:
1.17 millert 175: if (!interactive) {
176: (void)fclose(out);
1.6 millert 177: (void)waitpid(pid, NULL, 0);
1.17 millert 178: }
1.1 millert 179: }
180:
1.6 millert 181: FILE *
1.14 millert 182: runsendmail(struct passwd *pw, pid_t *pidp)
1.6 millert 183: {
184: FILE *fp;
1.14 millert 185: int pfd[2];
186: pid_t pid;
1.6 millert 187:
188: if (pipe(pfd) < 0)
189: return(NULL);
190:
191: switch (pid = fork()) {
192: case -1: /* fork(2) failed */
193: (void)close(pfd[0]);
194: (void)close(pfd[1]);
195: return(NULL);
196: case 0: /* In child */
197: (void)close(pfd[1]);
198: (void)dup2(pfd[0], STDIN_FILENO);
199: (void)close(pfd[0]);
200:
201: /* Run sendmail as target user not root */
1.19 millert 202: if (getuid() == 0 &&
203: setusercontext(NULL, pw, pw->pw_uid, LOGIN_SETALL) != 0) {
1.9 millert 204: warn("cannot set user context");
205: _exit(127);
206: }
1.6 millert 207:
1.11 deraadt 208: execl(_PATH_SENDMAIL, "sendmail", "-t", (char *)NULL);
1.6 millert 209: warn("cannot run \"%s -t\"", _PATH_SENDMAIL);
210: _exit(127);
211: }
212:
213: /* In parent */
214: *pidp = pid;
215: fp = fdopen(pfd[1], "w");
216: (void)close(pfd[0]);
217:
218: return(fp);
219: }
1.14 millert 220:
221: __dead void
222: usage(void)
1.1 millert 223: {
1.14 millert 224: extern char *__progname;
225:
1.24 ! sobrado 226: (void)fprintf(stderr, "usage: %s [-ai] [-l limit]\n",
1.1 millert 227: __progname);
228: exit(1);
229: }
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