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- Committer: Teddy Hogeborn
- Date: 2008-07-22 01:59:47 UTC
- Revision ID: teddy@fukt.bsnet.se-20080722015947-y7o6keji020nvrhw
* Makefile (OPTIMIZE): New; optimize for size.
(CFLAGS): Use $(OPTIMIZE).
(CFLAGS): Use $(OPTIMIZE).
- files added:
- ca.pem
- files removed:
- initramfs-tools-hook
- files renamed:
- clients.conf => mandos-clients.conf
- plugin-runner.c => plugbasedclient.c
- plugins.d/password-request.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos => server.py
- files modified:
- Makefile
added
removed
plugbasedclient.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn and Björn Påhlsson.
6
6
*
7
7
* This program is free software: you can redistribute it and/or
8
8
* modify it under the terms of the GNU General Public License as
18
18
* along with this program. If not, see
19
19
* <http://www.gnu.org/licenses/>.
20
20
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
21
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
22
* <https://www.fukt.bsnet.se/~teddy/>.
22
23
*/
23
24
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
26
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
FD_SET(), FD_ISSET(), FD_CLR */
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strtok, strlen(), strcpy(),
55
strcat() */
56
#include <errno.h> /* errno */
57
#include <argp.h> /* struct argp_option, struct
58
argp_state, struct argp,
59
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
sigaddset(), sigaction(),
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
#include <errno.h> /* errno, EBADF */
66
67
#define BUFFER_SIZE 256
68
69
const char *argp_program_version = "plugin-runner 1.0";
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
25
#define _FORTIFY_SOURCE 2
26
27
#include <stdio.h> /* popen, fileno */
28
#include <iso646.h> /* and, or, not */
29
#include <sys/types.h> /* DIR, opendir, stat, struct stat, waitpid,
30
WIFEXITED, WEXITSTATUS, wait */
31
#include <sys/wait.h> /* wait */
32
#include <dirent.h> /* DIR, opendir */
33
#include <sys/stat.h> /* stat, struct stat */
34
#include <unistd.h> /* stat, struct stat, chdir */
35
#include <stdlib.h> /* EXIT_FAILURE */
36
#include <sys/select.h> /* fd_set, select, FD_ZERO, FD_SET,
37
FD_ISSET */
38
#include <string.h> /* strlen, strcpy, strcat */
39
#include <stdbool.h> /* true */
40
#include <sys/wait.h> /* waitpid, WIFEXITED, WEXITSTATUS */
41
#include <errno.h> /* errno */
71
42
72
43
struct process;
73
44
77
48
char *buffer;
78
49
size_t buffer_size;
79
50
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
51
struct process *next;
84
52
} process;
85
53
86
typedef struct plugin{
87
char *name; /* can be NULL or any plugin name */
88
char **argv;
89
int argc;
90
bool disabled;
91
struct plugin *next;
92
} plugin;
93
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
96
if ((p->name == name)
97
or (p->name and name and (strcmp(p->name, name) == 0))){
98
return p;
99
}
100
}
101
/* Create a new plugin */
102
plugin *new_plugin = malloc(sizeof(plugin));
103
if (new_plugin == NULL){
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
108
new_plugin->argv = malloc(sizeof(char *) * 2);
109
if (new_plugin->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
112
}
113
new_plugin->argv[0] = name;
114
new_plugin->argv[1] = NULL;
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
118
/* Append the new plugin to the list */
119
*plugin_list = new_plugin;
120
return new_plugin;
121
}
122
123
static void addargument(plugin *p, char *arg){
124
p->argv[p->argc] = arg;
125
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
126
if (p->argv == NULL){
127
perror("malloc");
128
exit(EXIT_FAILURE);
129
}
130
p->argc++;
131
p->argv[p->argc] = NULL;
132
}
133
134
/*
135
* Based on the example in the GNU LibC manual chapter 13.13 "File
136
* Descriptor Flags".
137
* *Note File Descriptor Flags:(libc)Descriptor Flags.
138
*/
139
static int set_cloexec_flag(int fd)
140
{
141
int ret = fcntl(fd, F_GETFD, 0);
142
/* If reading the flags failed, return error indication now. */
143
if(ret < 0){
144
return ret;
145
}
146
/* Store modified flag word in the descriptor. */
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
148
}
149
150
process *process_list = NULL;
151
152
/* Mark a process as completed when it exits, and save its exit
153
status. */
154
void handle_sigchld(__attribute__((unused)) int sig){
155
process *proc = process_list;
156
int status;
157
pid_t pid = wait(&status);
158
if(pid == -1){
159
perror("wait");
160
return;
161
}
162
while(proc != NULL and proc->pid != pid){
163
proc = proc->next;
164
}
165
if(proc == NULL){
166
/* Process not found in process list */
167
return;
168
}
169
proc->status = status;
170
proc->completed = true;
171
}
172
173
bool print_out_password(const char *buffer, size_t length){
174
ssize_t ret;
175
if(length>0 and buffer[length-1] == '\n'){
176
length--;
177
}
178
for(size_t written = 0; written < length; written += (size_t)ret){
179
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
180
length - written));
181
if(ret < 0){
182
return false;
183
}
184
}
185
return true;
186
}
54
#define BUFFER_SIZE 256
187
55
188
56
int main(int argc, char *argv[]){
189
const char *plugindir = "/lib/mandos/plugins.d";
190
size_t d_name_len;
191
DIR *dir = NULL;
57
char plugindir[] = "plugins.d";
58
size_t d_name_len, plugindir_len = sizeof(plugindir)-1;
59
DIR *dir;
192
60
struct dirent *dirst;
193
61
struct stat st;
194
fd_set rfds_all;
62
fd_set rfds_orig;
195
63
int ret, maxfd = 0;
196
uid_t uid = 65534;
197
gid_t gid = 65534;
198
bool debug = false;
199
int exitstatus = EXIT_SUCCESS;
200
struct sigaction old_sigchld_action;
201
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
202
.sa_flags = SA_NOCLDSTOP };
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
205
206
/* Establish a signal handler */
207
sigemptyset(&sigchld_action.sa_mask);
208
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
209
if(ret < 0){
210
perror("sigaddset");
211
exit(EXIT_FAILURE);
212
}
213
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
214
if(ret < 0){
215
perror("sigaction");
216
exit(EXIT_FAILURE);
217
}
218
219
/* The options we understand. */
220
struct argp_option options[] = {
221
{ .name = "global-options", .key = 'g',
222
.arg = "OPTION[,OPTION[,...]]",
223
.doc = "Options passed to all plugins" },
224
{ .name = "options-for", .key = 'o',
225
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
226
.doc = "Options passed only to specified plugin" },
227
{ .name = "disable", .key = 'd',
228
.arg = "PLUGIN",
229
.doc = "Disable a specific plugin", .group = 1 },
230
{ .name = "plugin-dir", .key = 128,
231
.arg = "DIRECTORY",
232
.doc = "Specify a different plugin directory", .group = 2 },
233
{ .name = "userid", .key = 129,
234
.arg = "ID", .flags = 0,
235
.doc = "User ID the plugins will run as", .group = 2 },
236
{ .name = "groupid", .key = 130,
237
.arg = "ID", .flags = 0,
238
.doc = "Group ID the plugins will run as", .group = 2 },
239
{ .name = "debug", .key = 131,
240
.doc = "Debug mode", .group = 3 },
241
{ .name = NULL }
242
};
243
244
error_t parse_opt (int key, char *arg, struct argp_state *state) {
245
/* Get the INPUT argument from `argp_parse', which we know is a
246
pointer to our plugin list pointer. */
247
plugin **plugins = state->input;
248
switch (key) {
249
case 'g':
250
if (arg != NULL){
251
char *p = strtok(arg, ",");
252
do{
253
addargument(getplugin(NULL, plugins), p);
254
p = strtok(NULL, ",");
255
} while (p != NULL);
256
}
257
break;
258
case 'o':
259
if (arg != NULL){
260
char *name = strtok(arg, ":");
261
char *p = strtok(NULL, ":");
262
if(p != NULL){
263
p = strtok(p, ",");
264
do{
265
addargument(getplugin(name, plugins), p);
266
p = strtok(NULL, ",");
267
} while (p != NULL);
268
}
269
}
270
break;
271
case 'd':
272
if (arg != NULL){
273
getplugin(arg, plugins)->disabled = true;
274
}
275
break;
276
case 128:
277
plugindir = arg;
278
break;
279
case 129:
280
uid = (uid_t)strtol(arg, NULL, 10);
281
break;
282
case 130:
283
gid = (gid_t)strtol(arg, NULL, 10);
284
break;
285
case 131:
286
debug = true;
287
break;
288
case ARGP_KEY_ARG:
289
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
290
argp_usage (state);
291
}
292
plus_options = arg;
293
break;
294
case ARGP_KEY_END:
295
break;
296
default:
297
return ARGP_ERR_UNKNOWN;
298
}
299
return 0;
300
}
301
302
plugin *plugin_list = NULL;
303
304
struct argp argp = { .options = options, .parser = parse_opt,
305
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
306
.doc = "Mandos plugin runner -- Run plugins" };
307
308
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
309
if (ret == ARGP_ERR_UNKNOWN){
310
fprintf(stderr, "Unknown error while parsing arguments\n");
311
exitstatus = EXIT_FAILURE;
312
goto end;
313
}
314
315
if(plus_options){
316
/* This is a mangled argument in the form of
317
"+--option+--other-option=parameter+--yet-another-option", etc */
318
/* Make new argc and argv vars, and call argp_parse() again. */
319
plus_options++; /* skip the first '+' character */
320
const char delims[] = "+";
321
char *arg;
322
int new_argc = 1;
323
plus_argv = malloc(sizeof(char*) * 2);
324
if(plus_argv == NULL){
325
perror("malloc");
326
exitstatus = EXIT_FAILURE;
327
goto end;
328
}
329
plus_argv[0] = argv[0];
330
plus_argv[1] = NULL;
331
arg = strtok(plus_options, delims); /* Get first argument */
332
while(arg != NULL){
333
new_argc++;
334
plus_argv = realloc(plus_argv, sizeof(char *)
335
* ((unsigned int) new_argc + 1));
336
if(plus_argv == NULL){
337
perror("realloc");
338
exitstatus = EXIT_FAILURE;
339
goto end;
340
}
341
plus_argv[new_argc-1] = arg;
342
plus_argv[new_argc] = NULL;
343
arg = strtok(NULL, delims); /* Get next argument */
344
}
345
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
346
if (ret == ARGP_ERR_UNKNOWN){
347
fprintf(stderr, "Unknown error while parsing arguments\n");
348
exitstatus = EXIT_FAILURE;
349
goto end;
350
}
351
}
352
353
if(debug){
354
for(plugin *p = plugin_list; p != NULL; p=p->next){
355
fprintf(stderr, "Plugin: %s has %d arguments\n",
356
p->name ? p->name : "Global", p->argc - 1);
357
for(char **a = p->argv; *a != NULL; a++){
358
fprintf(stderr, "\tArg: %s\n", *a);
359
}
360
}
361
}
362
363
ret = setuid(uid);
364
if (ret == -1){
365
perror("setuid");
366
}
367
368
setgid(gid);
369
if (ret == -1){
370
perror("setgid");
371
}
64
process *process_list = NULL;
372
65
373
66
dir = opendir(plugindir);
67
374
68
if(dir == NULL){
375
perror("Could not open plugin dir");
376
exitstatus = EXIT_FAILURE;
377
goto end;
378
}
379
380
/* Set the FD_CLOEXEC flag on the directory, if possible */
381
{
382
int dir_fd = dirfd(dir);
383
if(dir_fd >= 0){
384
ret = set_cloexec_flag(dir_fd);
385
if(ret < 0){
386
perror("set_cloexec_flag");
387
exitstatus = EXIT_FAILURE;
388
goto end;
389
}
390
}
391
}
392
393
FD_ZERO(&rfds_all);
69
fprintf(stderr, "Can not open directory\n");
70
return EXIT_FAILURE;
71
}
72
73
FD_ZERO(&rfds_orig);
394
74
395
75
while(true){
396
76
dirst = readdir(dir);
397
77
398
78
// All directory entries have been processed
399
79
if(dirst == NULL){
400
if (errno == EBADF){
401
perror("readdir");
402
exitstatus = EXIT_FAILURE;
403
goto end;
404
}
405
80
break;
406
81
}
407
82
408
83
d_name_len = strlen(dirst->d_name);
409
84
410
// Ignore dotfiles, backup files and other junk
411
{
412
bool bad_name = false;
413
414
const char const *bad_prefixes[] = { ".", "#", NULL };
415
416
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
417
".dpkg-old",
418
".dpkg-divert", NULL };
419
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
420
size_t pre_len = strlen(*pre);
421
if((d_name_len >= pre_len)
422
and strncmp((dirst->d_name), *pre, pre_len) == 0){
423
if(debug){
424
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
425
" with bad prefix %s\n", dirst->d_name, *pre);
426
}
427
bad_name = true;
428
break;
429
}
430
}
431
432
if(bad_name){
433
continue;
434
}
435
436
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
437
size_t suf_len = strlen(*suf);
438
if((d_name_len >= suf_len)
439
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
440
== 0)){
441
if(debug){
442
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
443
" with bad suffix %s\n", dirst->d_name, *suf);
444
}
445
bad_name = true;
446
break;
447
}
448
}
449
450
if(bad_name){
451
continue;
452
}
453
}
454
455
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
456
if (filename == NULL){
457
perror("malloc");
458
continue;
459
}
460
strcpy(filename, plugindir); /* Spurious warning */
461
strcat(filename, "/"); /* Spurious warning */
462
strcat(filename, dirst->d_name); /* Spurious warning */
463
464
ret = stat(filename, &st);
465
if (ret == -1){
466
perror("stat");
467
free(filename);
468
continue;
469
}
470
471
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
472
if(debug){
473
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
474
" with bad type or mode\n", filename);
475
}
476
free(filename);
477
continue;
478
}
479
if(getplugin(dirst->d_name, &plugin_list)->disabled){
480
if(debug){
481
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
482
dirst->d_name);
483
}
484
free(filename);
485
continue;
486
}
487
plugin *p = getplugin(dirst->d_name, &plugin_list);
488
{
489
/* Add global arguments to argument list for this plugin */
490
plugin *g = getplugin(NULL, &plugin_list);
491
for(char **a = g->argv + 1; *a != NULL; a++){
492
addargument(p, *a);
493
}
494
}
495
int pipefd[2];
496
ret = pipe(pipefd);
497
if (ret == -1){
498
perror("pipe");
499
exitstatus = EXIT_FAILURE;
500
goto end;
501
}
502
ret = set_cloexec_flag(pipefd[0]);
503
if(ret < 0){
504
perror("set_cloexec_flag");
505
exitstatus = EXIT_FAILURE;
506
goto end;
507
}
508
ret = set_cloexec_flag(pipefd[1]);
509
if(ret < 0){
510
perror("set_cloexec_flag");
511
exitstatus = EXIT_FAILURE;
512
goto end;
513
}
514
/* Block SIGCHLD until process is safely in process list */
515
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
516
if(ret < 0){
517
perror("sigprocmask");
518
exitstatus = EXIT_FAILURE;
519
goto end;
520
}
521
// Starting a new process to be watched
522
pid_t pid = fork();
523
if(pid == -1){
524
perror("fork");
525
exitstatus = EXIT_FAILURE;
526
goto end;
527
}
528
if(pid == 0){
529
/* this is the child process */
530
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
531
if(ret < 0){
532
perror("sigaction");
533
_exit(EXIT_FAILURE);
534
}
535
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
536
if(ret < 0){
537
perror("sigprocmask");
538
_exit(EXIT_FAILURE);
539
}
540
541
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
542
if(ret == -1){
543
perror("dup2");
544
_exit(EXIT_FAILURE);
545
}
546
547
if(dirfd(dir) < 0){
548
/* If dir has no file descriptor, we could not set FD_CLOEXEC
549
above and must now close it manually here. */
85
// Ignore dotfiles and backup files
86
if (dirst->d_name[0] == '.'
87
or dirst->d_name[d_name_len - 1] == '~'){
88
continue;
89
}
90
91
char *filename = malloc(d_name_len + plugindir_len + 2);
92
strcpy(filename, plugindir);
93
strcat(filename, "/");
94
strcat(filename, dirst->d_name);
95
96
stat(filename, &st);
97
98
if (S_ISREG(st.st_mode) and (access(filename, X_OK) == 0)){
99
// Starting a new process to be watched
100
process *new_process = malloc(sizeof(process));
101
int pipefd[2];
102
pipe(pipefd);
103
new_process->pid = fork();
104
if(new_process->pid == 0){
105
/* this is the child process */
550
106
closedir(dir);
551
}
552
if(execv(filename, p->argv) < 0){
553
perror("execv");
554
_exit(EXIT_FAILURE);
555
}
556
/* no return */
557
}
558
/* parent process */
559
free(filename);
560
close(pipefd[1]); /* close unused write end of pipe */
561
process *new_process = malloc(sizeof(process));
562
if (new_process == NULL){
563
perror("malloc");
564
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
565
if(ret < 0){
566
perror("sigprocmask");
567
}
568
exitstatus = EXIT_FAILURE;
569
goto end;
570
}
571
572
*new_process = (struct process){ .pid = pid,
573
.fd = pipefd[0],
574
.next = process_list };
575
// List handling
576
process_list = new_process;
577
/* Unblock SIGCHLD so signal handler can be run if this process
578
has already completed */
579
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
580
if(ret < 0){
581
perror("sigprocmask");
582
exitstatus = EXIT_FAILURE;
583
goto end;
584
}
585
586
FD_SET(new_process->fd, &rfds_all);
587
588
if (maxfd < new_process->fd){
589
maxfd = new_process->fd;
590
}
591
592
}
593
594
/* Free the plugin list */
595
for(plugin *next; plugin_list != NULL; plugin_list = next){
596
next = plugin_list->next;
597
free(plugin_list->argv);
598
free(plugin_list);
107
close(pipefd[0]); /* close unused read end of pipe */
108
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
109
/* create a new modified argument list */
110
char **new_argv = malloc(sizeof(char *)
111
* ((unsigned int) argc + 1));
112
new_argv[0] = filename;
113
for(int i = 1; i < argc; i++){
114
new_argv[i] = argv[i];
115
}
116
new_argv[argc] = NULL;
117
if(execv(filename, new_argv) < 0){
118
perror(argv[0]);
119
close(pipefd[1]);
120
exit(EXIT_FAILURE);
121
}
122
/* no return */
123
}
124
close(pipefd[1]); /* close unused write end of pipe */
125
new_process->fd = pipefd[0];
126
new_process->buffer = malloc(BUFFER_SIZE);
127
if (new_process->buffer == NULL){
128
perror(argv[0]);
129
goto end;
130
}
131
new_process->buffer_size = BUFFER_SIZE;
132
new_process->buffer_length = 0;
133
FD_SET(new_process->fd, &rfds_orig);
134
135
if (maxfd < new_process->fd){
136
maxfd = new_process->fd;
137
}
138
139
//List handling
140
new_process->next = process_list;
141
process_list = new_process;
142
}
599
143
}
600
144
601
145
closedir(dir);
602
dir = NULL;
603
604
if (process_list == NULL){
605
fprintf(stderr, "No plugin processes started. Incorrect plugin"
606
" directory?\n");
607
process_list = NULL;
608
}
609
while(process_list){
610
fd_set rfds = rfds_all;
611
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
612
if (select_ret == -1){
613
perror("select");
614
exitstatus = EXIT_FAILURE;
615
goto end;
616
}
617
/* OK, now either a process completed, or something can be read
618
from one of them */
619
for(process *proc = process_list; proc ; proc = proc->next){
620
/* Is this process completely done? */
621
if(proc->eof and proc->completed){
622
/* Only accept the plugin output if it exited cleanly */
623
if(not WIFEXITED(proc->status)
624
or WEXITSTATUS(proc->status) != 0){
625
/* Bad exit by plugin */
626
if(debug){
627
if(WIFEXITED(proc->status)){
628
fprintf(stderr, "Plugin %u exited with status %d\n",
629
(unsigned int) (proc->pid),
630
WEXITSTATUS(proc->status));
631
} else if(WIFSIGNALED(proc->status)) {
632
fprintf(stderr, "Plugin %u killed by signal %d\n",
633
(unsigned int) (proc->pid),
634
WTERMSIG(proc->status));
635
} else if(WCOREDUMP(proc->status)){
636
fprintf(stderr, "Plugin %d dumped core\n",
637
(unsigned int) (proc->pid));
638
}
639
}
640
/* Remove the plugin */
641
FD_CLR(proc->fd, &rfds_all);
642
/* Block signal while modifying process_list */
643
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
644
if(ret < 0){
645
perror("sigprocmask");
646
exitstatus = EXIT_FAILURE;
647
goto end;
648
}
649
/* Delete this process entry from the list */
650
if(process_list == proc){
651
/* First one - simple */
652
process_list = proc->next;
653
} else {
654
/* Second one or later */
655
for(process *p = process_list; p != NULL; p = p->next){
656
if(p->next == proc){
657
p->next = proc->next;
658
break;
146
147
if (process_list != NULL){
148
while(true){
149
fd_set rfds = rfds_orig;
150
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
151
if (select_ret == -1){
152
perror(argv[0]);
153
goto end;
154
}else{
155
for(process *process_itr = process_list; process_itr != NULL;
156
process_itr = process_itr->next){
157
if(FD_ISSET(process_itr->fd, &rfds)){
158
if(process_itr->buffer_length + BUFFER_SIZE
159
> process_itr->buffer_size){
160
process_itr->buffer = realloc(process_itr->buffer,
161
process_itr->buffer_size
162
+ (size_t) BUFFER_SIZE);
163
if (process_itr->buffer == NULL){
164
perror(argv[0]);
165
goto end;
166
}
167
process_itr->buffer_size += BUFFER_SIZE;
168
}
169
ret = read(process_itr->fd, process_itr->buffer
170
+ process_itr->buffer_length, BUFFER_SIZE);
171
if(ret < 0){
172
/* Read error from this process; ignore it */
173
continue;
174
}
175
process_itr->buffer_length += (size_t) ret;
176
if(ret == 0){
177
/* got EOF */
178
/* wait for process exit */
179
int status;
180
waitpid(process_itr->pid, &status, 0);
181
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
182
write(STDOUT_FILENO, process_itr->buffer,
183
process_itr->buffer_length);
184
goto end;
185
} else {
186
FD_CLR(process_itr->fd, &rfds_orig);
659
187
}
660
188
}
661
189
}
662
/* We are done modifying process list, so unblock signal */
663
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
664
NULL);
665
if(ret < 0){
666
perror("sigprocmask");
667
}
668
free(proc->buffer);
669
free(proc);
670
/* We deleted this process from the list, so we can't go
671
proc->next. Therefore, start over from the beginning of
672
the process list */
673
break;
674
}
675
/* This process exited nicely, so print its buffer */
676
677
bool bret = print_out_password(proc->buffer, proc->buffer_length);
678
if(not bret){
679
perror("print_out_password");
680
exitstatus = EXIT_FAILURE;
681
}
682
goto end;
683
}
684
/* This process has not completed. Does it have any output? */
685
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
686
/* This process had nothing to say at this time */
687
continue;
688
}
689
/* Before reading, make the process' data buffer large enough */
690
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
691
proc->buffer = realloc(proc->buffer, proc->buffer_size
692
+ (size_t) BUFFER_SIZE);
693
if (proc->buffer == NULL){
694
perror("malloc");
695
exitstatus = EXIT_FAILURE;
696
goto end;
697
}
698
proc->buffer_size += BUFFER_SIZE;
699
}
700
/* Read from the process */
701
ret = read(proc->fd, proc->buffer + proc->buffer_length,
702
BUFFER_SIZE);
703
if(ret < 0){
704
/* Read error from this process; ignore the error */
705
continue;
706
}
707
if(ret == 0){
708
/* got EOF */
709
proc->eof = true;
710
} else {
711
proc->buffer_length += (size_t) ret;
190
}
712
191
}
713
192
}
714
193
}
715
716
194
717
195
end:
718
719
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
720
/* Fallback if all plugins failed, none are found or an error occured */
721
bool bret;
722
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
723
char *passwordbuffer = getpass("Password: ");
724
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
725
if(not bret){
726
perror("print_out_password");
727
exitstatus = EXIT_FAILURE;
728
goto end;
729
}
730
}
731
732
/* Restore old signal handler */
733
sigaction(SIGCHLD, &old_sigchld_action, NULL);
734
735
free(plus_argv);
736
737
/* Free the plugin list */
738
for(plugin *next; plugin_list != NULL; plugin_list = next){
739
next = plugin_list->next;
740
free(plugin_list->argv);
741
free(plugin_list);
742
}
743
744
if(dir != NULL){
745
closedir(dir);
746
}
747
748
/* Free the process list and kill the processes */
749
for(process *next; process_list != NULL; process_list = next){
750
next = process_list->next;
751
close(process_list->fd);
752
ret = kill(process_list->pid, SIGTERM);
753
if(ret == -1 and errno != ESRCH){
754
/* set-uid proccesses migth not get closed */
755
perror("kill");
756
}
757
free(process_list->buffer);
758
free(process_list);
759
}
760
761
/* Wait for any remaining child processes to terminate */
762
do{
763
ret = wait(NULL);
764
} while(ret >= 0);
765
if(errno != ECHILD){
766
perror("wait");
767
}
768
769
return exitstatus;
196
for(process *process_itr = process_list; process_itr != NULL;
197
process_itr = process_itr->next){
198
close(process_itr->fd);
199
kill(process_itr->pid, SIGTERM);
200
free(process_itr->buffer);
201
}
202
203
while(true){
204
int status;
205
ret = wait(&status);
206
if (ret == -1){
207
if(errno != ECHILD){
208
perror("wait");
209
}
210
break;
211
}
212
}
213
return EXIT_SUCCESS;
770
214
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0