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- Committer: Teddy Hogeborn
- Date: 2008-07-21 23:18:02 UTC
- mfrom: (15.1.5 mandos) (15.1.5 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080721231802-0emzdsxkfy457p9u
merge
- files added:
- ca.pem
- files removed:
- mandos-client.xml
- files renamed:
- clients.conf => mandos-clients.conf
- mandos-client.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 = "mandos-client 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
size_t ret;
175
for(size_t written = 0; written < length; written += ret){
176
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
177
length - written));
178
if(ret < 0){
179
return false;
180
}
181
}
182
return true;
183
}
54
#define BUFFER_SIZE 256
184
55
185
56
int main(int argc, char *argv[]){
186
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
187
size_t d_name_len;
188
DIR *dir = NULL;
57
char plugindir[] = "plugins.d";
58
size_t d_name_len, plugindir_len = sizeof(plugindir)-1;
59
DIR *dir;
189
60
struct dirent *dirst;
190
61
struct stat st;
191
fd_set rfds_all;
62
fd_set rfds_orig;
192
63
int ret, maxfd = 0;
193
uid_t uid = 65534;
194
gid_t gid = 65534;
195
bool debug = false;
196
int exitstatus = EXIT_SUCCESS;
197
struct sigaction old_sigchld_action;
198
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
199
.sa_flags = SA_NOCLDSTOP };
200
char *plus_options = NULL;
201
char **plus_argv = NULL;
202
203
/* Establish a signal handler */
204
sigemptyset(&sigchld_action.sa_mask);
205
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
206
if(ret < 0){
207
perror("sigaddset");
208
exit(EXIT_FAILURE);
209
}
210
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
211
if(ret < 0){
212
perror("sigaction");
213
exit(EXIT_FAILURE);
214
}
215
216
/* The options we understand. */
217
struct argp_option options[] = {
218
{ .name = "global-options", .key = 'g',
219
.arg = "OPTION[,OPTION[,...]]",
220
.doc = "Options passed to all plugins" },
221
{ .name = "options-for", .key = 'o',
222
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
223
.doc = "Options passed only to specified plugin" },
224
{ .name = "disable", .key = 'd',
225
.arg = "PLUGIN",
226
.doc = "Disable a specific plugin", .group = 1 },
227
{ .name = "plugin-dir", .key = 128,
228
.arg = "DIRECTORY",
229
.doc = "Specify a different plugin directory", .group = 2 },
230
{ .name = "userid", .key = 129,
231
.arg = "ID", .flags = 0,
232
.doc = "User ID the plugins will run as", .group = 2 },
233
{ .name = "groupid", .key = 130,
234
.arg = "ID", .flags = 0,
235
.doc = "Group ID the plugins will run as", .group = 2 },
236
{ .name = "debug", .key = 131,
237
.doc = "Debug mode", .group = 3 },
238
{ .name = NULL }
239
};
240
241
error_t parse_opt (int key, char *arg, struct argp_state *state) {
242
/* Get the INPUT argument from `argp_parse', which we know is a
243
pointer to our plugin list pointer. */
244
plugin **plugins = state->input;
245
switch (key) {
246
case 'g':
247
if (arg != NULL){
248
char *p = strtok(arg, ",");
249
do{
250
addargument(getplugin(NULL, plugins), p);
251
p = strtok(NULL, ",");
252
} while (p != NULL);
253
}
254
break;
255
case 'o':
256
if (arg != NULL){
257
char *name = strtok(arg, ":");
258
char *p = strtok(NULL, ":");
259
if(p != NULL){
260
p = strtok(p, ",");
261
do{
262
addargument(getplugin(name, plugins), p);
263
p = strtok(NULL, ",");
264
} while (p != NULL);
265
}
266
}
267
break;
268
case 'd':
269
if (arg != NULL){
270
getplugin(arg, plugins)->disabled = true;
271
}
272
break;
273
case 128:
274
plugindir = arg;
275
break;
276
case 129:
277
uid = (uid_t)strtol(arg, NULL, 10);
278
break;
279
case 130:
280
gid = (gid_t)strtol(arg, NULL, 10);
281
break;
282
case 131:
283
debug = true;
284
break;
285
case ARGP_KEY_ARG:
286
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
287
argp_usage (state);
288
}
289
plus_options = arg;
290
break;
291
case ARGP_KEY_END:
292
break;
293
default:
294
return ARGP_ERR_UNKNOWN;
295
}
296
return 0;
297
}
298
299
plugin *plugin_list = NULL;
300
301
struct argp argp = { .options = options, .parser = parse_opt,
302
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
303
.doc = "Mandos plugin runner -- Run plugins" };
304
305
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
306
if (ret == ARGP_ERR_UNKNOWN){
307
fprintf(stderr, "Unkown error while parsing arguments\n");
308
exitstatus = EXIT_FAILURE;
309
goto end;
310
}
311
312
if(plus_options){
313
/* This is a mangled argument in the form of
314
"+--option+--other-option=parameter+--yet-another-option", etc */
315
/* Make new argc and argv vars, and call argp_parse() again. */
316
plus_options++; /* skip the first '+' character */
317
const char delims[] = "+";
318
char *arg;
319
int new_argc = 1;
320
plus_argv = malloc(sizeof(char*) * 2);
321
if(plus_argv == NULL){
322
perror("malloc");
323
exitstatus = EXIT_FAILURE;
324
goto end;
325
}
326
plus_argv[0] = argv[0];
327
plus_argv[1] = NULL;
328
arg = strtok(plus_options, delims); /* Get first argument */
329
while(arg != NULL){
330
new_argc++;
331
plus_argv = realloc(plus_argv, sizeof(char *)
332
* ((unsigned int) new_argc + 1));
333
if(plus_argv == NULL){
334
perror("realloc");
335
exitstatus = EXIT_FAILURE;
336
goto end;
337
}
338
plus_argv[new_argc-1] = arg;
339
plus_argv[new_argc] = NULL;
340
arg = strtok(NULL, delims); /* Get next argument */
341
}
342
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
343
if (ret == ARGP_ERR_UNKNOWN){
344
fprintf(stderr, "Unkown error while parsing arguments\n");
345
exitstatus = EXIT_FAILURE;
346
goto end;
347
}
348
}
349
350
if(debug){
351
for(plugin *p = plugin_list; p != NULL; p=p->next){
352
fprintf(stderr, "Plugin: %s has %d arguments\n",
353
p->name ? p->name : "Global", p->argc - 1);
354
for(char **a = p->argv; *a != NULL; a++){
355
fprintf(stderr, "\tArg: %s\n", *a);
356
}
357
}
358
}
359
360
ret = setuid(uid);
361
if (ret == -1){
362
perror("setuid");
363
}
364
365
setgid(gid);
366
if (ret == -1){
367
perror("setgid");
368
}
64
process *process_list = NULL;
369
65
370
66
dir = opendir(plugindir);
67
371
68
if(dir == NULL){
372
perror("Could not open plugin dir");
373
exitstatus = EXIT_FAILURE;
374
goto end;
375
}
376
377
/* Set the FD_CLOEXEC flag on the directory, if possible */
378
{
379
int dir_fd = dirfd(dir);
380
if(dir_fd >= 0){
381
ret = set_cloexec_flag(dir_fd);
382
if(ret < 0){
383
perror("set_cloexec_flag");
384
exitstatus = EXIT_FAILURE;
385
goto end;
386
}
387
}
388
}
389
390
FD_ZERO(&rfds_all);
69
fprintf(stderr, "Can not open directory\n");
70
return EXIT_FAILURE;
71
}
72
73
FD_ZERO(&rfds_orig);
391
74
392
75
while(true){
393
76
dirst = readdir(dir);
394
77
395
78
// All directory entries have been processed
396
79
if(dirst == NULL){
397
if (errno == EBADF){
398
perror("readdir");
399
exitstatus = EXIT_FAILURE;
400
goto end;
401
}
402
80
break;
403
81
}
404
82
405
83
d_name_len = strlen(dirst->d_name);
406
84
407
// Ignore dotfiles, backup files and other junk
408
{
409
bool bad_name = false;
410
411
const char const *bad_prefixes[] = { ".", "#", NULL };
412
413
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
414
".dpkg-old",
415
".dpkg-divert", NULL };
416
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
417
size_t pre_len = strlen(*pre);
418
if((d_name_len >= pre_len)
419
and strncmp((dirst->d_name), *pre, pre_len) == 0){
420
if(debug){
421
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
422
" with bad prefix %s\n", dirst->d_name, *pre);
423
}
424
bad_name = true;
425
break;
426
}
427
}
428
429
if(bad_name){
430
continue;
431
}
432
433
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
434
size_t suf_len = strlen(*suf);
435
if((d_name_len >= suf_len)
436
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
437
== 0)){
438
if(debug){
439
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
440
" with bad suffix %s\n", dirst->d_name, *suf);
441
}
442
bad_name = true;
443
break;
444
}
445
}
446
447
if(bad_name){
448
continue;
449
}
450
}
451
452
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
453
if (filename == NULL){
454
perror("malloc");
455
exitstatus = EXIT_FAILURE;
456
goto end;
457
}
458
strcpy(filename, plugindir); /* Spurious warning */
459
strcat(filename, "/"); /* Spurious warning */
460
strcat(filename, dirst->d_name); /* Spurious warning */
461
462
ret = stat(filename, &st);
463
if (ret == -1){
464
perror("stat");
465
exitstatus = EXIT_FAILURE;
466
goto end;
467
}
468
469
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
470
if(debug){
471
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
472
" with bad type or mode\n", filename);
473
}
474
free(filename);
475
continue;
476
}
477
if(getplugin(dirst->d_name, &plugin_list)->disabled){
478
if(debug){
479
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
480
dirst->d_name);
481
}
482
free(filename);
483
continue;
484
}
485
plugin *p = getplugin(dirst->d_name, &plugin_list);
486
{
487
/* Add global arguments to argument list for this plugin */
488
plugin *g = getplugin(NULL, &plugin_list);
489
for(char **a = g->argv + 1; *a != NULL; a++){
490
addargument(p, *a);
491
}
492
}
493
int pipefd[2];
494
ret = pipe(pipefd);
495
if (ret == -1){
496
perror("pipe");
497
exitstatus = EXIT_FAILURE;
498
goto end;
499
}
500
ret = set_cloexec_flag(pipefd[0]);
501
if(ret < 0){
502
perror("set_cloexec_flag");
503
exitstatus = EXIT_FAILURE;
504
goto end;
505
}
506
ret = set_cloexec_flag(pipefd[1]);
507
if(ret < 0){
508
perror("set_cloexec_flag");
509
exitstatus = EXIT_FAILURE;
510
goto end;
511
}
512
/* Block SIGCHLD until process is safely in process list */
513
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
514
if(ret < 0){
515
perror("sigprocmask");
516
exitstatus = EXIT_FAILURE;
517
goto end;
518
}
519
// Starting a new process to be watched
520
pid_t pid = fork();
521
if(pid == 0){
522
/* this is the child process */
523
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
524
if(ret < 0){
525
perror("sigaction");
526
_exit(EXIT_FAILURE);
527
}
528
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
529
if(ret < 0){
530
perror("sigprocmask");
531
_exit(EXIT_FAILURE);
532
}
533
534
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
535
if(ret == -1){
536
perror("dup2");
537
_exit(EXIT_FAILURE);
538
}
539
540
if(dirfd(dir) < 0){
541
/* If dir has no file descriptor, we could not set FD_CLOEXEC
542
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 */
543
106
closedir(dir);
544
}
545
if(execv(filename, p->argv) < 0){
546
perror("execv");
547
_exit(EXIT_FAILURE);
548
}
549
/* no return */
550
}
551
/* parent process */
552
free(filename);
553
close(pipefd[1]); /* close unused write end of pipe */
554
process *new_process = malloc(sizeof(process));
555
if (new_process == NULL){
556
perror("malloc");
557
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
558
if(ret < 0){
559
perror("sigprocmask");
560
}
561
exitstatus = EXIT_FAILURE;
562
goto end;
563
}
564
565
*new_process = (struct process){ .pid = pid,
566
.fd = pipefd[0],
567
.next = process_list };
568
// List handling
569
process_list = new_process;
570
/* Unblock SIGCHLD so signal handler can be run if this process
571
has already completed */
572
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
573
if(ret < 0){
574
perror("sigprocmask");
575
exitstatus = EXIT_FAILURE;
576
goto end;
577
}
578
579
FD_SET(new_process->fd, &rfds_all);
580
581
if (maxfd < new_process->fd){
582
maxfd = new_process->fd;
583
}
584
585
}
586
587
/* Free the plugin list */
588
for(plugin *next; plugin_list != NULL; plugin_list = next){
589
next = plugin_list->next;
590
free(plugin_list->argv);
591
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
}
592
143
}
593
144
594
145
closedir(dir);
595
dir = NULL;
596
597
if (process_list == NULL){
598
fprintf(stderr, "No plugin processes started. Incorrect plugin"
599
" directory?\n");
600
process_list = NULL;
601
}
602
while(process_list){
603
fd_set rfds = rfds_all;
604
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
605
if (select_ret == -1){
606
perror("select");
607
exitstatus = EXIT_FAILURE;
608
goto end;
609
}
610
/* OK, now either a process completed, or something can be read
611
from one of them */
612
for(process *proc = process_list; proc ; proc = proc->next){
613
/* Is this process completely done? */
614
if(proc->eof and proc->completed){
615
/* Only accept the plugin output if it exited cleanly */
616
if(not WIFEXITED(proc->status)
617
or WEXITSTATUS(proc->status) != 0){
618
/* Bad exit by plugin */
619
if(debug){
620
if(WIFEXITED(proc->status)){
621
fprintf(stderr, "Plugin %u exited with status %d\n",
622
(unsigned int) (proc->pid),
623
WEXITSTATUS(proc->status));
624
} else if(WIFSIGNALED(proc->status)) {
625
fprintf(stderr, "Plugin %u killed by signal %d\n",
626
(unsigned int) (proc->pid),
627
WTERMSIG(proc->status));
628
} else if(WCOREDUMP(proc->status)){
629
fprintf(stderr, "Plugin %d dumped core\n",
630
(unsigned int) (proc->pid));
631
}
632
}
633
/* Remove the plugin */
634
FD_CLR(proc->fd, &rfds_all);
635
/* Block signal while modifying process_list */
636
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
637
if(ret < 0){
638
perror("sigprocmask");
639
exitstatus = EXIT_FAILURE;
640
goto end;
641
}
642
/* Delete this process entry from the list */
643
if(process_list == proc){
644
/* First one - simple */
645
process_list = proc->next;
646
} else {
647
/* Second one or later */
648
for(process *p = process_list; p != NULL; p = p->next){
649
if(p->next == proc){
650
p->next = proc->next;
651
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);
652
187
}
653
188
}
654
189
}
655
/* We are done modifying process list, so unblock signal */
656
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
657
NULL);
658
if(ret < 0){
659
perror("sigprocmask");
660
}
661
free(proc->buffer);
662
free(proc);
663
/* We deleted this process from the list, so we can't go
664
proc->next. Therefore, start over from the beginning of
665
the process list */
666
break;
667
}
668
/* This process exited nicely, so print its buffer */
669
670
bool bret = print_out_password(proc->buffer, proc->buffer_length);
671
if(not bret){
672
perror("print_out_password");
673
exitstatus = EXIT_FAILURE;
674
}
675
goto end;
676
}
677
/* This process has not completed. Does it have any output? */
678
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
679
/* This process had nothing to say at this time */
680
continue;
681
}
682
/* Before reading, make the process' data buffer large enough */
683
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
684
proc->buffer = realloc(proc->buffer, proc->buffer_size
685
+ (size_t) BUFFER_SIZE);
686
if (proc->buffer == NULL){
687
perror("malloc");
688
exitstatus = EXIT_FAILURE;
689
goto end;
690
}
691
proc->buffer_size += BUFFER_SIZE;
692
}
693
/* Read from the process */
694
ret = read(proc->fd, proc->buffer + proc->buffer_length,
695
BUFFER_SIZE);
696
if(ret < 0){
697
/* Read error from this process; ignore the error */
698
continue;
699
}
700
if(ret == 0){
701
/* got EOF */
702
proc->eof = true;
703
} else {
704
proc->buffer_length += (size_t) ret;
190
}
705
191
}
706
192
}
707
193
}
708
194
709
if(process_list == NULL){
710
bool bret;
711
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
712
char *passwordbuffer = getpass("Password: ");
713
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
714
if(not bret){
715
perror("print_out_password");
716
exitstatus = EXIT_FAILURE;
717
goto end;
718
}
719
bret = print_out_password("\n", 1);
720
if(not bret){
721
perror("print_out_password");
722
exitstatus = EXIT_FAILURE;
723
}
724
}
725
726
195
end:
727
728
/* Restore old signal handler */
729
sigaction(SIGCHLD, &old_sigchld_action, NULL);
730
731
free(plus_argv);
732
733
/* Free the plugin list */
734
for(plugin *next; plugin_list != NULL; plugin_list = next){
735
next = plugin_list->next;
736
free(plugin_list->argv);
737
free(plugin_list);
738
}
739
740
if(dir != NULL){
741
closedir(dir);
742
}
743
744
/* Free the process list and kill the processes */
745
for(process *next; process_list != NULL; process_list = next){
746
next = process_list->next;
747
close(process_list->fd);
748
ret = kill(process_list->pid, SIGTERM);
749
if(ret == -1 and errno != ESRCH){
750
/* set-uid proccesses migth not get closed */
751
perror("kill");
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;
752
211
}
753
free(process_list->buffer);
754
free(process_list);
755
}
756
757
/* Wait for any remaining child processes to terminate */
758
do{
759
ret = wait(NULL);
760
} while(ret >= 0);
761
if(errno != ECHILD){
762
perror("wait");
763
}
764
765
return exitstatus;
212
}
213
return EXIT_SUCCESS;
766
214
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0