Commit | Line | Data |
---|---|---|
b4389814 | 1 | static char *sccsid = "@(#)login.c.1 4.14 82/03/15"; |
88a01c09 BJ |
2 | /* |
3 | * login [ name ] | |
86eb6c9e | 4 | * login -r |
b4389814 | 5 | * login -r [ rhost ] |
88a01c09 BJ |
6 | */ |
7 | ||
8 | #include <sys/types.h> | |
9 | #include <sgtty.h> | |
10 | #include <utmp.h> | |
11 | #include <signal.h> | |
12 | #include <pwd.h> | |
13 | #include <stdio.h> | |
14 | #include <sys/stat.h> | |
15 | #include <lastlog.h> | |
f570e1ff BJ |
16 | |
17 | #define SCPYN(a, b) strncpy(a, b, sizeof(a)) | |
88a01c09 | 18 | |
b4389814 BJ |
19 | #define NMAX sizeof(utmp.ut_name) |
20 | #define LMAX sizeof(utmp.ut_line) | |
88a01c09 | 21 | |
f570e1ff BJ |
22 | #define FALSE 0 |
23 | #define TRUE -1 | |
24 | ||
25 | char nolog[] = "/etc/nologin"; | |
26 | char qlog[] = ".hushlogin"; | |
27 | char securetty[] = "/etc/securetty"; | |
88a01c09 BJ |
28 | char maildir[30] = "/usr/spool/mail/"; |
29 | char lastlog[] = "/usr/adm/lastlog"; | |
30 | struct passwd nouser = {"", "nope"}; | |
31 | struct sgttyb ttyb; | |
32 | struct utmp utmp; | |
33 | char minusnam[16] = "-"; | |
86eb6c9e | 34 | |
88a01c09 BJ |
35 | char homedir[64] = "HOME="; |
36 | char shell[64] = "SHELL="; | |
37 | char term[64] = "TERM="; | |
f570e1ff | 38 | char user[20] = "USER="; |
86eb6c9e BJ |
39 | char *speeds[] = |
40 | { "0", "50", "75", "110", "134", "150", "200", "300", | |
41 | "600", "1200", "1800", "2400", "4800", "9600", "19200", "38400" }; | |
42 | #define NSPEEDS (sizeof (speeds) / sizeof (speeds[0])) | |
43 | ||
44 | char *envinit[] = | |
45 | {homedir, shell, "PATH=:/usr/ucb:/bin:/usr/bin", term, user, 0}; | |
88a01c09 | 46 | |
86eb6c9e | 47 | struct passwd *pwd; |
88a01c09 | 48 | struct passwd *getpwnam(); |
86eb6c9e | 49 | char *strcat(), *rindex(), *index(); |
88a01c09 BJ |
50 | int setpwent(); |
51 | char *ttyname(); | |
52 | char *crypt(); | |
53 | char *getpass(); | |
54 | char *rindex(); | |
55 | char *stypeof(); | |
56 | extern char **environ; | |
57 | ||
841d84b0 BJ |
58 | #define CTRL(c) ('c'&037) |
59 | #define CERASE '#' | |
60 | #define CEOT CTRL(d) | |
61 | #define CKILL '@' | |
62 | #define CQUIT 034 /* FS, cntl shift L */ | |
63 | #define CINTR 0177 /* DEL */ | |
64 | #define CSTOP CTRL(s) | |
65 | #define CSTART CTRL(q) | |
66 | #define CBRK 0377 | |
67 | struct tchars tc = { | |
68 | CINTR, CQUIT, CSTART, CSTOP, CEOT, CBRK | |
69 | }; | |
70 | struct ltchars ltc = { | |
1113d588 | 71 | CTRL(z), CTRL(y), CTRL(r), CTRL(o), CTRL(w), CTRL(v) |
841d84b0 BJ |
72 | }; |
73 | ||
86eb6c9e | 74 | int rflag; |
b4389814 | 75 | char rusername[NMAX+1], lusername[NMAX+1]; |
86eb6c9e | 76 | char rpassword[NMAX+1]; |
b4389814 | 77 | char *rhost; |
86eb6c9e | 78 | |
88a01c09 BJ |
79 | main(argc, argv) |
80 | char **argv; | |
81 | { | |
82 | register char *namep; | |
83 | int t, f, c; | |
f570e1ff BJ |
84 | int invalid; |
85 | int quietlog; | |
86 | int i; | |
87 | FILE *nlfd; | |
88a01c09 | 88 | char *ttyn; |
b4389814 BJ |
89 | int ldisc = 0, zero = 0; |
90 | FILE *hostf; int first = 1; | |
88a01c09 BJ |
91 | |
92 | alarm(60); | |
93 | signal(SIGQUIT, SIG_IGN); | |
94 | signal(SIGINT, SIG_IGN); | |
95 | nice(-100); | |
96 | nice(20); | |
97 | nice(0); | |
86eb6c9e BJ |
98 | if (argc > 0 && !strcmp(argv[1], "-r")) { |
99 | rflag++; | |
b4389814 BJ |
100 | if (argc > 1) |
101 | rhost = argv[2]; | |
102 | argc = 1; | |
103 | if (rhost) { | |
104 | getstr(rusername, sizeof (rusername), "remuser"); | |
105 | getstr(lusername, sizeof (lusername), "locuser"); | |
106 | } else { | |
107 | getstr(lusername, sizeof (lusername), "Username"); | |
108 | getstr(rpassword, sizeof (rpassword), "Password"); | |
109 | } | |
86eb6c9e | 110 | getstr(term+5, sizeof(term)-5, "Terminal type"); |
b4389814 BJ |
111 | if (rhost == 0) |
112 | goto normal; | |
113 | if (getuid()) { | |
114 | rflag = 0; | |
115 | goto normal; | |
116 | } | |
117 | setpwent(); | |
118 | pwd = getpwnam(lusername); | |
119 | if (pwd == NULL) { | |
120 | fprintf(stderr, "Login incorrect.\n"); | |
121 | exit(1); | |
122 | } | |
123 | endpwent(); | |
124 | hostf = fopen("/etc/hosts.equiv", "r"); | |
125 | again: | |
126 | if (hostf) { | |
127 | char ahost[32]; | |
128 | while (fgets(ahost, sizeof (ahost), hostf)) { | |
129 | char *user; | |
130 | if (index(ahost, '\n')) | |
131 | *index(ahost, '\n') = 0; | |
132 | user = index(ahost, ' '); | |
133 | if (user) | |
134 | *user++ = 0; | |
135 | if (!strcmp(rhost, ahost) && | |
136 | !strcmp(rusername, user ? user : lusername)) | |
137 | goto normal; | |
138 | } | |
139 | fclose(hostf); | |
140 | } | |
141 | if (first == 1) { | |
142 | first = 0; | |
143 | if (chdir(pwd->pw_dir) < 0) | |
144 | goto again; | |
145 | hostf = fopen(".rhosts", "r"); | |
146 | goto again; | |
147 | } | |
148 | rhost = 0; | |
149 | rflag = -1; | |
86eb6c9e | 150 | } |
b4389814 BJ |
151 | normal: |
152 | ioctl(0, TIOCLSET, &zero); | |
c95ed2b2 | 153 | ioctl(0, TIOCNXCL, 0); |
88a01c09 | 154 | gtty(0, &ttyb); |
86eb6c9e BJ |
155 | if (rflag) { |
156 | char *cp = index(term, '/'); | |
157 | if (cp) { | |
158 | int i; | |
159 | *cp++ = 0; | |
160 | for (i = 0; i < NSPEEDS; i++) | |
161 | if (!strcmp(speeds[i], cp)) { | |
162 | ttyb.sg_ispeed = ttyb.sg_ospeed = i; | |
163 | break; | |
164 | } | |
165 | } | |
166 | ttyb.sg_flags = ECHO|CRMOD|ANYP|XTABS; | |
167 | } | |
b4389814 BJ |
168 | if (rflag == -1) |
169 | rflag = 0; | |
f570e1ff BJ |
170 | ttyb.sg_erase = CERASE; |
171 | ttyb.sg_kill = CKILL; | |
88a01c09 | 172 | stty(0, &ttyb); |
841d84b0 BJ |
173 | ioctl(0, TIOCSETC, &tc); |
174 | ioctl(0, TIOCSLTC, <c); | |
88a01c09 BJ |
175 | for (t=3; t<20; t++) |
176 | close(t); | |
177 | ttyn = ttyname(0); | |
f570e1ff | 178 | if (ttyn==(char *)0) |
88a01c09 | 179 | ttyn = "/dev/tty??"; |
f570e1ff BJ |
180 | do { |
181 | ldisc = 0; | |
c95ed2b2 | 182 | ioctl(0, TIOCSETD, &ldisc); |
f570e1ff BJ |
183 | invalid = FALSE; |
184 | SCPYN(utmp.ut_name, ""); | |
185 | if (argc>1) { | |
186 | SCPYN(utmp.ut_name, argv[1]); | |
187 | argc = 0; | |
188 | } | |
86eb6c9e | 189 | if (rflag) |
b4389814 | 190 | strcpy(utmp.ut_name, lusername); |
86eb6c9e | 191 | else |
b4389814 BJ |
192 | while (utmp.ut_name[0] == '\0') { |
193 | namep = utmp.ut_name; | |
194 | { char hostname[32]; | |
195 | gethostname(hostname, sizeof (hostname)); | |
196 | printf("%s login: ", hostname); } | |
197 | while ((c = getchar()) != '\n') { | |
198 | if (c == ' ') | |
199 | c = '_'; | |
200 | if (c == EOF) | |
201 | exit(0); | |
202 | if (namep < utmp.ut_name+NMAX) | |
203 | *namep++ = c; | |
204 | } | |
f570e1ff | 205 | } |
b4389814 BJ |
206 | if (rhost == 0) { |
207 | setpwent(); | |
208 | if ((pwd = getpwnam(utmp.ut_name)) == NULL) | |
209 | pwd = &nouser; | |
210 | endpwent(); | |
f570e1ff | 211 | } |
f570e1ff BJ |
212 | if (!strcmp(pwd->pw_shell, "/bin/csh")) { |
213 | ldisc = NTTYDISC; | |
214 | ioctl(0, TIOCSETD, &ldisc); | |
215 | } | |
b4389814 BJ |
216 | if (rhost == 0) { |
217 | if (*pwd->pw_passwd != '\0') { | |
218 | char *pp; | |
219 | nice(-4); | |
220 | if (rflag == 0) | |
221 | pp = getpass("Password:"); | |
222 | else | |
223 | pp = rpassword; | |
224 | namep = crypt(pp,pwd->pw_passwd); | |
225 | nice(4); | |
226 | if (strcmp(namep, pwd->pw_passwd)) | |
227 | invalid = TRUE; | |
228 | } | |
f570e1ff BJ |
229 | } |
230 | if (pwd->pw_uid != 0 && (nlfd = fopen(nolog, "r")) > 0) { | |
231 | /* logins are disabled except for root */ | |
232 | while ((c = getc(nlfd)) != EOF) | |
233 | putchar(c); | |
234 | fflush(stdout); | |
235 | sleep(5); | |
236 | exit(0); | |
237 | } | |
238 | if (!invalid && pwd->pw_uid == 0 && | |
239 | !rootterm(ttyn+sizeof("/dev/")-1)) { | |
240 | FILE *console = fopen("/dev/console", "w"); | |
241 | if (console != NULL) { | |
242 | fprintf(console, "\r\nROOT LOGIN REFUSED %s\r\n" | |
243 | , ttyn+sizeof("/dev/")-1 | |
244 | ); | |
245 | fclose(console); | |
246 | } | |
247 | invalid = TRUE; | |
248 | } | |
249 | if (invalid) { | |
88a01c09 | 250 | printf("Login incorrect\n"); |
f570e1ff | 251 | if (ttyn[sizeof("/dev/tty")-1] == 'd') { |
88a01c09 BJ |
252 | FILE *console = fopen("/dev/console", "w"); |
253 | if (console != NULL) { | |
f570e1ff BJ |
254 | fprintf(console, "\r\nBADDIALUP %s %s\r\n" |
255 | , ttyn+sizeof("/dev/")-1 | |
256 | , utmp.ut_name); | |
88a01c09 BJ |
257 | fclose(console); |
258 | } | |
259 | } | |
88a01c09 | 260 | } |
f570e1ff BJ |
261 | if (*pwd->pw_shell == '\0') |
262 | pwd->pw_shell = "/bin/sh"; | |
263 | i = strlen(pwd->pw_shell); | |
264 | if (chdir(pwd->pw_dir) < 0 && !invalid ) { | |
265 | if (chdir("/") < 0) { | |
266 | printf("No directory!\n"); | |
267 | invalid = TRUE; | |
268 | } else { | |
269 | printf("No directory! Logging in with home=/\n"); | |
270 | pwd->pw_dir = "/"; | |
271 | } | |
88a01c09 | 272 | } |
86eb6c9e BJ |
273 | if (rflag && invalid) |
274 | exit(1); | |
f570e1ff | 275 | } while (invalid); |
88a01c09 | 276 | |
86eb6c9e | 277 | |
88a01c09 BJ |
278 | time(&utmp.ut_time); |
279 | t = ttyslot(); | |
280 | if (t>0 && (f = open("/etc/utmp", 1)) >= 0) { | |
281 | lseek(f, (long)(t*sizeof(utmp)), 0); | |
282 | SCPYN(utmp.ut_line, rindex(ttyn, '/')+1); | |
283 | write(f, (char *)&utmp, sizeof(utmp)); | |
284 | close(f); | |
285 | } | |
286 | if (t>0 && (f = open("/usr/adm/wtmp", 1)) >= 0) { | |
287 | lseek(f, 0L, 2); | |
288 | write(f, (char *)&utmp, sizeof(utmp)); | |
289 | close(f); | |
290 | } | |
f570e1ff BJ |
291 | quietlog = FALSE; |
292 | if (access(qlog, 0) == 0) | |
293 | quietlog = TRUE; | |
294 | if ( !quietlog && (f = open(lastlog, 2)) >= 0 ) { | |
295 | struct lastlog ll; | |
296 | ||
297 | lseek(f, (long)pwd->pw_uid * sizeof (struct lastlog), 0); | |
298 | if (read(f, (char *) &ll, sizeof ll) == sizeof ll && | |
299 | ll.ll_time != 0) { | |
300 | printf("Last login: %.*s on %.*s\n" | |
301 | , 24-5 | |
302 | , (char *) ctime(&ll.ll_time) | |
303 | , sizeof(ll.ll_line) | |
304 | , ll.ll_line | |
305 | ); | |
306 | } | |
307 | lseek(f, (long)pwd->pw_uid * sizeof (struct lastlog), 0); | |
308 | time(&ll.ll_time); | |
309 | SCPYN(ll.ll_line, rindex(ttyn, '/')+1); | |
310 | write(f, (char *) &ll, sizeof ll); | |
311 | close(f); | |
312 | } | |
88a01c09 BJ |
313 | chown(ttyn, pwd->pw_uid, pwd->pw_gid); |
314 | setgid(pwd->pw_gid); | |
276d0f34 | 315 | inigrp(utmp.ut_name, pwd->pw_gid); |
88a01c09 | 316 | setuid(pwd->pw_uid); |
88a01c09 BJ |
317 | environ = envinit; |
318 | strncat(homedir, pwd->pw_dir, sizeof(homedir)-6); | |
319 | strncat(shell, pwd->pw_shell, sizeof(shell)-7); | |
86eb6c9e BJ |
320 | if (rflag == 0) |
321 | strncat(term, stypeof(ttyn), sizeof(term)-6); | |
f570e1ff | 322 | strncat(user, pwd->pw_name, sizeof(user)-6); |
88a01c09 BJ |
323 | if ((namep = rindex(pwd->pw_shell, '/')) == NULL) |
324 | namep = pwd->pw_shell; | |
325 | else | |
326 | namep++; | |
327 | strcat(minusnam, namep); | |
328 | alarm(0); | |
b4389814 | 329 | umask(022); |
f570e1ff BJ |
330 | if (ttyn[sizeof("/dev/tty")-1] == 'd') { |
331 | FILE *console = fopen("/dev/console", "w"); | |
332 | if (console != NULL) { | |
333 | fprintf(console, "\r\nDIALUP %s %s\r\n" | |
334 | , ttyn+sizeof("/dev/")-1 | |
335 | , pwd->pw_name | |
336 | ); | |
337 | fclose(console); | |
338 | } | |
88a01c09 | 339 | } |
f570e1ff BJ |
340 | if ( !quietlog ) { |
341 | showmotd(); | |
342 | strcat(maildir, pwd->pw_name); | |
343 | if (access(maildir,4)==0) { | |
344 | struct stat statb; | |
345 | stat(maildir, &statb); | |
346 | if (statb.st_size) | |
347 | printf("You have mail.\n"); | |
348 | } | |
349 | } | |
350 | ||
88a01c09 BJ |
351 | signal(SIGQUIT, SIG_DFL); |
352 | signal(SIGINT, SIG_DFL); | |
5f87416f | 353 | signal(SIGTSTP, SIG_IGN); |
88a01c09 | 354 | execlp(pwd->pw_shell, minusnam, 0); |
f570e1ff | 355 | perror(pwd->pw_shell); |
88a01c09 BJ |
356 | printf("No shell\n"); |
357 | exit(0); | |
358 | } | |
359 | ||
360 | int stopmotd; | |
361 | catch() | |
362 | { | |
363 | signal(SIGINT, SIG_IGN); | |
364 | stopmotd++; | |
365 | } | |
366 | ||
f570e1ff BJ |
367 | /* |
368 | * return true if OK for root to login on this terminal | |
369 | */ | |
370 | rootterm(tty) | |
371 | char *tty; | |
372 | { | |
373 | register FILE *fd; | |
374 | char buf[100]; | |
375 | ||
376 | if ((fd = fopen(securetty, "r")) == NULL) | |
377 | return(1); | |
378 | while (fgets(buf, sizeof buf, fd) != NULL) { | |
379 | buf[strlen(buf)-1] = '\0'; | |
380 | if (strcmp(tty, buf) == 0) { | |
381 | fclose(fd); | |
382 | return(1); | |
383 | } | |
384 | } | |
385 | fclose(fd); | |
386 | return(0); | |
387 | } | |
388 | ||
88a01c09 BJ |
389 | showmotd() |
390 | { | |
391 | FILE *mf; | |
392 | register c; | |
393 | ||
394 | signal(SIGINT, catch); | |
f570e1ff BJ |
395 | if ((mf = fopen("/etc/motd","r")) != NULL) { |
396 | while ((c = getc(mf)) != EOF && stopmotd == 0) | |
88a01c09 BJ |
397 | putchar(c); |
398 | fclose(mf); | |
399 | } | |
400 | signal(SIGINT, SIG_IGN); | |
401 | } | |
402 | ||
f570e1ff | 403 | #undef UNKNOWN |
88a01c09 BJ |
404 | #define UNKNOWN "su" |
405 | ||
406 | char * | |
407 | stypeof(ttyid) | |
408 | char *ttyid; | |
409 | { | |
410 | static char typebuf[16]; | |
411 | char buf[50]; | |
412 | register FILE *f; | |
413 | register char *p, *t, *q; | |
414 | ||
415 | if (ttyid == NULL) | |
416 | return (UNKNOWN); | |
417 | f = fopen("/etc/ttytype", "r"); | |
418 | if (f == NULL) | |
419 | return (UNKNOWN); | |
420 | /* split off end of name */ | |
421 | for (p = q = ttyid; *p != 0; p++) | |
422 | if (*p == '/') | |
423 | q = p + 1; | |
424 | ||
425 | /* scan the file */ | |
426 | while (fgets(buf, sizeof buf, f) != NULL) | |
427 | { | |
f570e1ff | 428 | for (t=buf; *t!=' ' && *t != '\t'; t++) |
88a01c09 BJ |
429 | ; |
430 | *t++ = 0; | |
f570e1ff BJ |
431 | while (*t == ' ' || *t == '\t') |
432 | t++; | |
88a01c09 BJ |
433 | for (p=t; *p>' '; p++) |
434 | ; | |
435 | *p = 0; | |
436 | if (strcmp(q,t)==0) { | |
437 | strcpy(typebuf, buf); | |
438 | fclose(f); | |
439 | return (typebuf); | |
440 | } | |
441 | } | |
442 | fclose (f); | |
443 | return (UNKNOWN); | |
444 | } | |
86eb6c9e BJ |
445 | |
446 | getstr(buf, cnt, err) | |
447 | char *buf; | |
448 | int cnt; | |
449 | char *err; | |
450 | { | |
451 | char c; | |
452 | ||
453 | do { | |
454 | if (read(0, &c, 1) != 1) | |
455 | exit(1); | |
456 | if (--cnt < 0) { | |
457 | printf("%s too long\r\n", err); | |
458 | exit(1); | |
459 | } | |
460 | *buf++ = c; | |
461 | } while (c != 0); | |
462 | } |