Commit | Line | Data |
---|---|---|
3479a16a | 1 | static char *sccsid = "@(#)login.c 4.20 82/12/21"; |
88a01c09 BJ |
2 | /* |
3 | * login [ name ] | |
86eb6c9e | 4 | * login -r |
88a01c09 BJ |
5 | */ |
6 | ||
7 | #include <sys/types.h> | |
8 | #include <sgtty.h> | |
9 | #include <utmp.h> | |
10 | #include <signal.h> | |
11 | #include <pwd.h> | |
12 | #include <stdio.h> | |
13 | #include <sys/stat.h> | |
14 | #include <lastlog.h> | |
f570e1ff BJ |
15 | |
16 | #define SCPYN(a, b) strncpy(a, b, sizeof(a)) | |
88a01c09 | 17 | |
b4389814 BJ |
18 | #define NMAX sizeof(utmp.ut_name) |
19 | #define LMAX sizeof(utmp.ut_line) | |
88a01c09 | 20 | |
f570e1ff BJ |
21 | #define FALSE 0 |
22 | #define TRUE -1 | |
23 | ||
24 | char nolog[] = "/etc/nologin"; | |
25 | char qlog[] = ".hushlogin"; | |
26 | char securetty[] = "/etc/securetty"; | |
88a01c09 BJ |
27 | char maildir[30] = "/usr/spool/mail/"; |
28 | char lastlog[] = "/usr/adm/lastlog"; | |
3479a16a | 29 | struct passwd nouser = {"", "nope", -1, -1, -1, "", "", "", "" }; |
88a01c09 BJ |
30 | struct sgttyb ttyb; |
31 | struct utmp utmp; | |
32 | char minusnam[16] = "-"; | |
86eb6c9e | 33 | |
88a01c09 BJ |
34 | char homedir[64] = "HOME="; |
35 | char shell[64] = "SHELL="; | |
36 | char term[64] = "TERM="; | |
f570e1ff | 37 | char user[20] = "USER="; |
86eb6c9e BJ |
38 | char *speeds[] = |
39 | { "0", "50", "75", "110", "134", "150", "200", "300", | |
40 | "600", "1200", "1800", "2400", "4800", "9600", "19200", "38400" }; | |
41 | #define NSPEEDS (sizeof (speeds) / sizeof (speeds[0])) | |
42 | ||
43 | char *envinit[] = | |
44 | {homedir, shell, "PATH=:/usr/ucb:/bin:/usr/bin", term, user, 0}; | |
88a01c09 | 45 | |
86eb6c9e | 46 | struct passwd *pwd; |
88a01c09 | 47 | struct passwd *getpwnam(); |
86eb6c9e | 48 | char *strcat(), *rindex(), *index(); |
88a01c09 BJ |
49 | int setpwent(); |
50 | char *ttyname(); | |
51 | char *crypt(); | |
52 | char *getpass(); | |
53 | char *rindex(); | |
54 | char *stypeof(); | |
55 | extern char **environ; | |
56 | ||
3479a16a SL |
57 | struct ttychars tc = { |
58 | CERASE, CKILL, CINTR, CQUIT, CSTART, | |
59 | CSTOP, CEOF, CBRK, CSUSP, CDSUSP, | |
60 | CRPRNT, CFLUSH, CWERASE,CLNEXT | |
841d84b0 BJ |
61 | }; |
62 | ||
86eb6c9e | 63 | int rflag; |
b4389814 | 64 | char rusername[NMAX+1], lusername[NMAX+1]; |
86eb6c9e | 65 | char rpassword[NMAX+1]; |
e5321f7b | 66 | char name[NMAX+1]; |
b4389814 | 67 | char *rhost; |
86eb6c9e | 68 | |
88a01c09 BJ |
69 | main(argc, argv) |
70 | char **argv; | |
71 | { | |
72 | register char *namep; | |
73 | int t, f, c; | |
f570e1ff BJ |
74 | int invalid; |
75 | int quietlog; | |
76 | int i; | |
77 | FILE *nlfd; | |
88a01c09 | 78 | char *ttyn; |
b4389814 BJ |
79 | int ldisc = 0, zero = 0; |
80 | FILE *hostf; int first = 1; | |
88a01c09 BJ |
81 | |
82 | alarm(60); | |
83 | signal(SIGQUIT, SIG_IGN); | |
84 | signal(SIGINT, SIG_IGN); | |
85 | nice(-100); | |
86 | nice(20); | |
87 | nice(0); | |
4f8d3876 | 88 | if (argc > 1 && !strcmp(argv[1], "-r")) { |
86eb6c9e | 89 | rflag++; |
4f8d3876 | 90 | rhost = argv[2]; |
b4389814 | 91 | argc = 1; |
4f8d3876 BJ |
92 | getstr(rusername, sizeof (rusername), "remuser"); |
93 | getstr(lusername, sizeof (lusername), "locuser"); | |
86eb6c9e | 94 | getstr(term+5, sizeof(term)-5, "Terminal type"); |
4f8d3876 BJ |
95 | if (getuid()) |
96 | goto abnormal; | |
b4389814 BJ |
97 | setpwent(); |
98 | pwd = getpwnam(lusername); | |
4f8d3876 | 99 | endpwent(); |
b4389814 | 100 | if (pwd == NULL) { |
4f8d3876 BJ |
101 | if (strcmp(rusername, lusername)) |
102 | printf("%s: No such user\r\n", lusername); | |
103 | goto abnormal; | |
b4389814 | 104 | } |
1886582e | 105 | hostf = pwd->pw_uid ? fopen("/etc/hosts.equiv", "r") : 0; |
b4389814 BJ |
106 | again: |
107 | if (hostf) { | |
108 | char ahost[32]; | |
109 | while (fgets(ahost, sizeof (ahost), hostf)) { | |
110 | char *user; | |
111 | if (index(ahost, '\n')) | |
112 | *index(ahost, '\n') = 0; | |
113 | user = index(ahost, ' '); | |
114 | if (user) | |
115 | *user++ = 0; | |
116 | if (!strcmp(rhost, ahost) && | |
4f8d3876 BJ |
117 | !strcmp(rusername, user ? user : lusername)) { |
118 | fclose(hostf); | |
b4389814 | 119 | goto normal; |
4f8d3876 | 120 | } |
b4389814 BJ |
121 | } |
122 | fclose(hostf); | |
123 | } | |
124 | if (first == 1) { | |
125 | first = 0; | |
126 | if (chdir(pwd->pw_dir) < 0) | |
127 | goto again; | |
128 | hostf = fopen(".rhosts", "r"); | |
129 | goto again; | |
130 | } | |
4f8d3876 | 131 | abnormal: |
b4389814 BJ |
132 | rhost = 0; |
133 | rflag = -1; | |
86eb6c9e | 134 | } |
b4389814 | 135 | normal: |
3479a16a | 136 | ioctl(0, TIOCLSET, &zero); /* XXX */ |
c95ed2b2 | 137 | ioctl(0, TIOCNXCL, 0); |
4f8d3876 BJ |
138 | ioctl(0, FIONBIO, &zero); |
139 | ioctl(0, FIOASYNC, &zero); | |
3479a16a | 140 | ioctl(0, TIOCGETP, &ttyb); /* XXX */ |
86eb6c9e BJ |
141 | if (rflag) { |
142 | char *cp = index(term, '/'); | |
143 | if (cp) { | |
144 | int i; | |
145 | *cp++ = 0; | |
146 | for (i = 0; i < NSPEEDS; i++) | |
147 | if (!strcmp(speeds[i], cp)) { | |
148 | ttyb.sg_ispeed = ttyb.sg_ospeed = i; | |
149 | break; | |
150 | } | |
151 | } | |
152 | ttyb.sg_flags = ECHO|CRMOD|ANYP|XTABS; | |
153 | } | |
3479a16a SL |
154 | ioctl(0, TIOCSETP, &ttyb); /* XXX */ |
155 | ioctl(0, TIOCCSET, &tc); | |
88a01c09 BJ |
156 | for (t=3; t<20; t++) |
157 | close(t); | |
158 | ttyn = ttyname(0); | |
f570e1ff | 159 | if (ttyn==(char *)0) |
88a01c09 | 160 | ttyn = "/dev/tty??"; |
f570e1ff BJ |
161 | do { |
162 | ldisc = 0; | |
c95ed2b2 | 163 | ioctl(0, TIOCSETD, &ldisc); |
f570e1ff BJ |
164 | invalid = FALSE; |
165 | SCPYN(utmp.ut_name, ""); | |
166 | if (argc>1) { | |
167 | SCPYN(utmp.ut_name, argv[1]); | |
168 | argc = 0; | |
169 | } | |
4f8d3876 | 170 | if (rflag) { |
3479a16a | 171 | SCPYN(utmp.ut_name, lusername); |
4f8d3876 BJ |
172 | if (rflag == -1) |
173 | rflag = 0; | |
174 | } else | |
b4389814 BJ |
175 | while (utmp.ut_name[0] == '\0') { |
176 | namep = utmp.ut_name; | |
177 | { char hostname[32]; | |
178 | gethostname(hostname, sizeof (hostname)); | |
179 | printf("%s login: ", hostname); } | |
180 | while ((c = getchar()) != '\n') { | |
181 | if (c == ' ') | |
182 | c = '_'; | |
183 | if (c == EOF) | |
184 | exit(0); | |
185 | if (namep < utmp.ut_name+NMAX) | |
186 | *namep++ = c; | |
187 | } | |
f570e1ff | 188 | } |
b4389814 BJ |
189 | if (rhost == 0) { |
190 | setpwent(); | |
191 | if ((pwd = getpwnam(utmp.ut_name)) == NULL) | |
192 | pwd = &nouser; | |
193 | endpwent(); | |
f570e1ff | 194 | } |
f570e1ff BJ |
195 | if (!strcmp(pwd->pw_shell, "/bin/csh")) { |
196 | ldisc = NTTYDISC; | |
197 | ioctl(0, TIOCSETD, &ldisc); | |
198 | } | |
b4389814 BJ |
199 | if (rhost == 0) { |
200 | if (*pwd->pw_passwd != '\0') { | |
201 | char *pp; | |
202 | nice(-4); | |
203 | if (rflag == 0) | |
204 | pp = getpass("Password:"); | |
205 | else | |
206 | pp = rpassword; | |
207 | namep = crypt(pp,pwd->pw_passwd); | |
208 | nice(4); | |
209 | if (strcmp(namep, pwd->pw_passwd)) | |
210 | invalid = TRUE; | |
211 | } | |
f570e1ff BJ |
212 | } |
213 | if (pwd->pw_uid != 0 && (nlfd = fopen(nolog, "r")) > 0) { | |
214 | /* logins are disabled except for root */ | |
215 | while ((c = getc(nlfd)) != EOF) | |
216 | putchar(c); | |
217 | fflush(stdout); | |
218 | sleep(5); | |
219 | exit(0); | |
220 | } | |
221 | if (!invalid && pwd->pw_uid == 0 && | |
222 | !rootterm(ttyn+sizeof("/dev/")-1)) { | |
4f8d3876 BJ |
223 | logerr("ROOT LOGIN REFUSED %s", |
224 | ttyn+sizeof("/dev/")-1); | |
f570e1ff BJ |
225 | invalid = TRUE; |
226 | } | |
227 | if (invalid) { | |
88a01c09 | 228 | printf("Login incorrect\n"); |
4f8d3876 BJ |
229 | if (ttyn[sizeof("/dev/tty")-1] == 'd') |
230 | logerr("BADDIALUP %s %s\n", | |
231 | ttyn+sizeof("/dev/")-1, utmp.ut_name); | |
88a01c09 | 232 | } |
f570e1ff BJ |
233 | if (*pwd->pw_shell == '\0') |
234 | pwd->pw_shell = "/bin/sh"; | |
235 | i = strlen(pwd->pw_shell); | |
236 | if (chdir(pwd->pw_dir) < 0 && !invalid ) { | |
237 | if (chdir("/") < 0) { | |
238 | printf("No directory!\n"); | |
239 | invalid = TRUE; | |
240 | } else { | |
241 | printf("No directory! Logging in with home=/\n"); | |
242 | pwd->pw_dir = "/"; | |
243 | } | |
88a01c09 | 244 | } |
86eb6c9e BJ |
245 | if (rflag && invalid) |
246 | exit(1); | |
f570e1ff | 247 | } while (invalid); |
88a01c09 | 248 | |
86eb6c9e | 249 | |
88a01c09 BJ |
250 | time(&utmp.ut_time); |
251 | t = ttyslot(); | |
252 | if (t>0 && (f = open("/etc/utmp", 1)) >= 0) { | |
253 | lseek(f, (long)(t*sizeof(utmp)), 0); | |
254 | SCPYN(utmp.ut_line, rindex(ttyn, '/')+1); | |
255 | write(f, (char *)&utmp, sizeof(utmp)); | |
256 | close(f); | |
257 | } | |
258 | if (t>0 && (f = open("/usr/adm/wtmp", 1)) >= 0) { | |
259 | lseek(f, 0L, 2); | |
260 | write(f, (char *)&utmp, sizeof(utmp)); | |
261 | close(f); | |
262 | } | |
4f8d3876 | 263 | quietlog = 0; |
f570e1ff | 264 | if (access(qlog, 0) == 0) |
4f8d3876 BJ |
265 | quietlog = 1; |
266 | if ((f = open(lastlog, 2)) >= 0) { | |
f570e1ff BJ |
267 | struct lastlog ll; |
268 | ||
269 | lseek(f, (long)pwd->pw_uid * sizeof (struct lastlog), 0); | |
270 | if (read(f, (char *) &ll, sizeof ll) == sizeof ll && | |
271 | ll.ll_time != 0) { | |
4f8d3876 | 272 | if (quietlog == 0) |
f570e1ff BJ |
273 | printf("Last login: %.*s on %.*s\n" |
274 | , 24-5 | |
275 | , (char *) ctime(&ll.ll_time) | |
276 | , sizeof(ll.ll_line) | |
277 | , ll.ll_line | |
278 | ); | |
279 | } | |
280 | lseek(f, (long)pwd->pw_uid * sizeof (struct lastlog), 0); | |
281 | time(&ll.ll_time); | |
282 | SCPYN(ll.ll_line, rindex(ttyn, '/')+1); | |
283 | write(f, (char *) &ll, sizeof ll); | |
284 | close(f); | |
285 | } | |
88a01c09 | 286 | chown(ttyn, pwd->pw_uid, pwd->pw_gid); |
3479a16a | 287 | chmod(ttyn, 0622); |
88a01c09 | 288 | setgid(pwd->pw_gid); |
e5321f7b KM |
289 | strncpy(name, utmp.ut_name, NMAX); |
290 | name[NMAX] = '\0'; | |
b1198826 | 291 | initgroups(name, pwd->pw_gid); |
88a01c09 | 292 | setuid(pwd->pw_uid); |
88a01c09 BJ |
293 | environ = envinit; |
294 | strncat(homedir, pwd->pw_dir, sizeof(homedir)-6); | |
295 | strncat(shell, pwd->pw_shell, sizeof(shell)-7); | |
4f8d3876 | 296 | if (term[strlen("TERM=")] == 0) |
86eb6c9e | 297 | strncat(term, stypeof(ttyn), sizeof(term)-6); |
f570e1ff | 298 | strncat(user, pwd->pw_name, sizeof(user)-6); |
88a01c09 BJ |
299 | if ((namep = rindex(pwd->pw_shell, '/')) == NULL) |
300 | namep = pwd->pw_shell; | |
301 | else | |
302 | namep++; | |
303 | strcat(minusnam, namep); | |
304 | alarm(0); | |
b4389814 | 305 | umask(022); |
4f8d3876 BJ |
306 | if (ttyn[sizeof("/dev/tty")-1] == 'd') |
307 | logerr("DIALUP %s %s\n", ttyn+sizeof("/dev/")-1, pwd->pw_name); | |
308 | if (!quietlog) { | |
f570e1ff BJ |
309 | showmotd(); |
310 | strcat(maildir, pwd->pw_name); | |
311 | if (access(maildir,4)==0) { | |
312 | struct stat statb; | |
313 | stat(maildir, &statb); | |
314 | if (statb.st_size) | |
315 | printf("You have mail.\n"); | |
316 | } | |
317 | } | |
318 | ||
88a01c09 BJ |
319 | signal(SIGQUIT, SIG_DFL); |
320 | signal(SIGINT, SIG_DFL); | |
5f87416f | 321 | signal(SIGTSTP, SIG_IGN); |
88a01c09 | 322 | execlp(pwd->pw_shell, minusnam, 0); |
f570e1ff | 323 | perror(pwd->pw_shell); |
88a01c09 BJ |
324 | printf("No shell\n"); |
325 | exit(0); | |
326 | } | |
327 | ||
328 | int stopmotd; | |
329 | catch() | |
330 | { | |
1886582e | 331 | |
88a01c09 BJ |
332 | signal(SIGINT, SIG_IGN); |
333 | stopmotd++; | |
334 | } | |
335 | ||
f570e1ff | 336 | rootterm(tty) |
1886582e | 337 | char *tty; |
f570e1ff BJ |
338 | { |
339 | register FILE *fd; | |
1886582e | 340 | char buf[100]; |
f570e1ff | 341 | |
1886582e BJ |
342 | if (rflag) |
343 | return(1); | |
f570e1ff BJ |
344 | if ((fd = fopen(securetty, "r")) == NULL) |
345 | return(1); | |
346 | while (fgets(buf, sizeof buf, fd) != NULL) { | |
347 | buf[strlen(buf)-1] = '\0'; | |
348 | if (strcmp(tty, buf) == 0) { | |
349 | fclose(fd); | |
350 | return(1); | |
351 | } | |
352 | } | |
353 | fclose(fd); | |
354 | return(0); | |
355 | } | |
356 | ||
88a01c09 BJ |
357 | showmotd() |
358 | { | |
359 | FILE *mf; | |
360 | register c; | |
361 | ||
362 | signal(SIGINT, catch); | |
f570e1ff BJ |
363 | if ((mf = fopen("/etc/motd","r")) != NULL) { |
364 | while ((c = getc(mf)) != EOF && stopmotd == 0) | |
88a01c09 BJ |
365 | putchar(c); |
366 | fclose(mf); | |
367 | } | |
368 | signal(SIGINT, SIG_IGN); | |
369 | } | |
370 | ||
f570e1ff | 371 | #undef UNKNOWN |
88a01c09 BJ |
372 | #define UNKNOWN "su" |
373 | ||
374 | char * | |
375 | stypeof(ttyid) | |
376 | char *ttyid; | |
377 | { | |
378 | static char typebuf[16]; | |
379 | char buf[50]; | |
380 | register FILE *f; | |
381 | register char *p, *t, *q; | |
382 | ||
383 | if (ttyid == NULL) | |
384 | return (UNKNOWN); | |
385 | f = fopen("/etc/ttytype", "r"); | |
386 | if (f == NULL) | |
387 | return (UNKNOWN); | |
388 | /* split off end of name */ | |
389 | for (p = q = ttyid; *p != 0; p++) | |
390 | if (*p == '/') | |
391 | q = p + 1; | |
392 | ||
393 | /* scan the file */ | |
394 | while (fgets(buf, sizeof buf, f) != NULL) | |
395 | { | |
f570e1ff | 396 | for (t=buf; *t!=' ' && *t != '\t'; t++) |
88a01c09 BJ |
397 | ; |
398 | *t++ = 0; | |
f570e1ff BJ |
399 | while (*t == ' ' || *t == '\t') |
400 | t++; | |
88a01c09 BJ |
401 | for (p=t; *p>' '; p++) |
402 | ; | |
403 | *p = 0; | |
404 | if (strcmp(q,t)==0) { | |
405 | strcpy(typebuf, buf); | |
406 | fclose(f); | |
407 | return (typebuf); | |
408 | } | |
409 | } | |
410 | fclose (f); | |
411 | return (UNKNOWN); | |
412 | } | |
86eb6c9e BJ |
413 | |
414 | getstr(buf, cnt, err) | |
415 | char *buf; | |
416 | int cnt; | |
417 | char *err; | |
418 | { | |
419 | char c; | |
420 | ||
421 | do { | |
422 | if (read(0, &c, 1) != 1) | |
423 | exit(1); | |
424 | if (--cnt < 0) { | |
425 | printf("%s too long\r\n", err); | |
426 | exit(1); | |
427 | } | |
428 | *buf++ = c; | |
429 | } while (c != 0); | |
430 | } | |
4f8d3876 BJ |
431 | |
432 | logerr(fmt, a1, a2, a3) | |
433 | char *fmt, *a1, *a2, *a3; | |
434 | { | |
435 | ||
436 | } |