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- Committer: Teddy Hogeborn
- Date: 2008-08-01 06:56:27 UTC
- Revision ID: teddy@fukt.bsnet.se-20080801065627-2c7k4ydefjgacgnq
* plugins.d/plugbasedclient.c (set_cloexec_flag): New function.
(main): Use the set_cloexec_flag function. Move inserting of global
arguments to before the fork.
(main): Use the set_cloexec_flag function. Move inserting of global
arguments to before the fork.
- files added:
- ca.pem
- files removed:
- initramfs-tools-hook
- files renamed:
- mandos-client.c => plugbasedclient.c
- plugins.d/password-request.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
plugbasedclient.c
21
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
22
*/
23
23
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() */
24
#include <stdio.h> /* popen(), fileno(), fprintf(),
25
stderr, STDOUT_FILENO */
42
26
#include <iso646.h> /* and, or, not */
27
#include <sys/types.h> /* DIR, opendir(), stat(), struct stat,
28
waitpid(), WIFEXITED(),
29
WEXITSTATUS(), wait() */
30
#include <sys/wait.h> /* wait() */
43
31
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
32
readdir(), closedir() */
33
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
45
34
#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() */
35
fcntl() */
36
#include <fcntl.h> /* fcntl() */
37
#include <stddef.h> /* NULL */
38
#include <stdlib.h> /* EXIT_FAILURE */
39
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
40
FD_SET(), FD_ISSET() */
41
#include <string.h> /* strlen(), strcpy(), strcat() */
42
#include <stdbool.h> /* true */
43
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
44
WEXITSTATUS() */
56
45
#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>";
46
#include <argp.h> /* struct argp_option,
47
struct argp_state, struct argp,
48
argp_parse() */
71
49
72
50
struct process;
73
51
77
55
char *buffer;
78
56
size_t buffer_size;
79
57
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
58
struct process *next;
84
59
} process;
85
60
91
66
struct plugin *next;
92
67
} plugin;
93
68
94
static plugin *getplugin(char *name, plugin **plugin_list){
69
plugin *getplugin(char *name, plugin **plugin_list){
95
70
for (plugin *p = *plugin_list; p != NULL; p = p->next){
96
71
if ((p->name == name)
97
72
or (p->name and name and (strcmp(p->name, name) == 0))){
120
95
return new_plugin;
121
96
}
122
97
123
static void addargument(plugin *p, char *arg){
98
void addargument(plugin *p, char *arg){
124
99
p->argv[p->argc] = arg;
125
100
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
126
101
if (p->argv == NULL){
136
111
* Descriptor Flags".
137
112
* *Note File Descriptor Flags:(libc)Descriptor Flags.
138
113
*/
139
static int set_cloexec_flag(int fd)
114
int set_cloexec_flag(int fd)
140
115
{
141
116
int ret = fcntl(fd, F_GETFD, 0);
142
117
/* If reading the flags failed, return error indication now. */
147
122
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
148
123
}
149
124
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
}
125
126
#define BUFFER_SIZE 256
127
128
const char *argp_program_version =
129
"plugbasedclient 0.9";
130
const char *argp_program_bug_address =
131
"<mandos@fukt.bsnet.se>";
187
132
188
133
int main(int argc, char *argv[]){
189
134
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
190
135
size_t d_name_len;
191
DIR *dir = NULL;
136
DIR *dir;
192
137
struct dirent *dirst;
193
138
struct stat st;
194
139
fd_set rfds_all;
195
140
int ret, maxfd = 0;
196
uid_t uid = 65534;
197
gid_t gid = 65534;
141
process *process_list = NULL;
198
142
bool debug = false;
199
143
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
144
219
145
/* The options we understand. */
220
146
struct argp_option options[] = {
230
156
{ .name = "plugin-dir", .key = 128,
231
157
.arg = "DIRECTORY",
232
158
.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,
159
{ .name = "debug", .key = 129,
240
160
.doc = "Debug mode", .group = 3 },
241
161
{ .name = NULL }
242
162
};
243
163
244
164
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. */
165
/* Get the INPUT argument from `argp_parse', which we
166
know is a pointer to our plugin list pointer. */
247
167
plugin **plugins = state->input;
248
168
switch (key) {
249
169
case 'g':
252
172
do{
253
173
addargument(getplugin(NULL, plugins), p);
254
174
p = strtok(NULL, ",");
255
} while (p != NULL);
175
} while (p);
256
176
}
257
177
break;
258
178
case 'o':
259
179
if (arg != NULL){
260
180
char *name = strtok(arg, ":");
261
181
char *p = strtok(NULL, ":");
262
if(p != NULL){
182
if(p){
263
183
p = strtok(p, ",");
264
184
do{
265
185
addargument(getplugin(name, plugins), p);
266
186
p = strtok(NULL, ",");
267
} while (p != NULL);
187
} while (p);
268
188
}
269
189
}
270
190
break;
277
197
plugindir = arg;
278
198
break;
279
199
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
200
debug = true;
287
201
break;
288
202
case ARGP_KEY_ARG:
289
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
290
argp_usage (state);
291
}
292
plus_options = arg;
203
argp_usage (state);
293
204
break;
294
205
case ARGP_KEY_END:
295
206
break;
302
213
plugin *plugin_list = NULL;
303
214
304
215
struct argp argp = { .options = options, .parser = parse_opt,
305
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
216
.args_doc = "",
306
217
.doc = "Mandos plugin runner -- Run plugins" };
307
218
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
}
219
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
352
220
353
221
if(debug){
354
222
for(plugin *p = plugin_list; p != NULL; p=p->next){
360
228
}
361
229
}
362
230
363
ret = setuid(uid);
364
if (ret == -1){
365
perror("setuid");
366
}
367
368
setgid(gid);
369
if (ret == -1){
370
perror("setgid");
371
}
372
373
231
dir = opendir(plugindir);
232
/* Set the FD_CLOEXEC flag on the directory */
233
ret = set_cloexec_flag(dirfd(dir));
234
if(ret < 0){
235
perror("set_cloexec_flag");
236
goto end;
237
}
238
374
239
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
}
240
fprintf(stderr, "Can not open directory\n");
241
return EXIT_FAILURE;
391
242
}
392
243
393
244
FD_ZERO(&rfds_all);
397
248
398
249
// All directory entries have been processed
399
250
if(dirst == NULL){
400
if (errno == EBADF){
401
perror("readdir");
402
exitstatus = EXIT_FAILURE;
403
goto end;
404
}
405
251
break;
406
252
}
407
253
421
267
if((d_name_len >= pre_len)
422
268
and strncmp((dirst->d_name), *pre, pre_len) == 0){
423
269
if(debug){
424
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
270
fprintf(stderr, "Ignoring plugin dir entry name \"%s\""
425
271
" with bad prefix %s\n", dirst->d_name, *pre);
426
272
}
427
273
bad_name = true;
439
285
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
440
286
== 0)){
441
287
if(debug){
442
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
288
fprintf(stderr, "Ignoring plugin dir entry name \"%s\""
443
289
" with bad suffix %s\n", dirst->d_name, *suf);
444
290
}
445
291
bad_name = true;
455
301
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
456
302
if (filename == NULL){
457
303
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
304
exitstatus =EXIT_FAILURE;
305
goto end;
306
}
307
strcpy(filename, plugindir);
308
strcat(filename, "/");
309
strcat(filename, dirst->d_name);
310
311
stat(filename, &st);
312
471
313
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
472
314
if(debug){
473
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
315
fprintf(stderr, "Ignoring plugin dir entry name \"%s\""
474
316
" with bad type or mode\n", filename);
475
317
}
476
free(filename);
477
318
continue;
478
319
}
479
320
if(getplugin(dirst->d_name, &plugin_list)->disabled){
480
321
if(debug){
481
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
322
fprintf(stderr, "Ignoring disabled plugin \"%s\"",
482
323
dirst->d_name);
483
324
}
484
free(filename);
485
325
continue;
486
326
}
327
// Starting a new process to be watched
328
int pipefd[2];
329
ret = pipe(pipefd);
330
if (ret == -1){
331
perror(argv[0]);
332
goto end;
333
}
487
334
plugin *p = getplugin(dirst->d_name, &plugin_list);
488
335
{
489
336
/* Add global arguments to argument list for this plugin */
492
339
addargument(p, *a);
493
340
}
494
341
}
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
342
pid_t pid = fork();
523
if(pid == -1){
524
perror("fork");
525
exitstatus = EXIT_FAILURE;
526
goto end;
527
}
528
343
if(pid == 0){
529
344
/* 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
}
345
closedir(dir);
346
close(pipefd[0]); /* close unused read end of pipe */
347
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
546
348
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. */
550
closedir(dir);
551
}
552
349
if(execv(filename, p->argv) < 0){
553
perror("execv");
350
perror(argv[0]);
351
close(pipefd[1]);
554
352
_exit(EXIT_FAILURE);
555
353
}
556
354
/* no return */
557
355
}
558
/* parent process */
559
free(filename);
560
356
close(pipefd[1]); /* close unused write end of pipe */
561
357
process *new_process = malloc(sizeof(process));
562
358
if (new_process == NULL){
563
359
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
360
exitstatus = EXIT_FAILURE;
361
goto end;
362
}
363
364
new_process->fd = pipefd[0];
365
new_process->buffer = malloc(BUFFER_SIZE);
366
if (new_process->buffer == NULL){
367
perror("malloc");
368
exitstatus = EXIT_FAILURE;
369
goto end;
370
}
371
new_process->buffer_size = BUFFER_SIZE;
372
new_process->buffer_length = 0;
586
373
FD_SET(new_process->fd, &rfds_all);
587
374
588
375
if (maxfd < new_process->fd){
589
376
maxfd = new_process->fd;
590
377
}
591
378
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);
379
//List handling
380
new_process->next = process_list;
381
process_list = new_process;
599
382
}
600
383
601
384
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;
385
386
if (process_list != NULL){
387
while(true){
388
fd_set rfds = rfds_all;
389
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
390
if (select_ret == -1){
391
perror(argv[0]);
392
goto end;
393
}else{
394
for(process *process_itr = process_list; process_itr != NULL;
395
process_itr = process_itr->next){
396
if(FD_ISSET(process_itr->fd, &rfds)){
397
if(process_itr->buffer_length + BUFFER_SIZE
398
> process_itr->buffer_size){
399
process_itr->buffer = realloc(process_itr->buffer,
400
process_itr->buffer_size
401
+ (size_t) BUFFER_SIZE);
402
if (process_itr->buffer == NULL){
403
perror(argv[0]);
404
goto end;
405
}
406
process_itr->buffer_size += BUFFER_SIZE;
407
}
408
ret = read(process_itr->fd, process_itr->buffer
409
+ process_itr->buffer_length, BUFFER_SIZE);
410
if(ret < 0){
411
/* Read error from this process; ignore it */
412
continue;
413
}
414
process_itr->buffer_length += (size_t) ret;
415
if(ret == 0){
416
/* got EOF */
417
/* wait for process exit */
418
int status;
419
waitpid(process_itr->pid, &status, 0);
420
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
421
for(size_t written = 0;
422
written < process_itr->buffer_length;){
423
ret = write(STDOUT_FILENO,
424
process_itr->buffer + written,
425
process_itr->buffer_length - written);
426
if(ret < 0){
427
perror(argv[0]);
428
goto end;
429
}
430
written += (size_t)ret;
431
}
432
goto end;
433
} else {
434
FD_CLR(process_itr->fd, &rfds_all);
659
435
}
660
436
}
661
437
}
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;
438
}
712
439
}
713
440
}
714
441
}
715
716
442
717
443
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
444
for(process *process_itr = process_list; process_itr != NULL;
445
process_itr = process_itr->next){
446
close(process_itr->fd);
447
kill(process_itr->pid, SIGTERM);
448
free(process_itr->buffer);
449
}
450
451
while(true){
452
int status;
453
ret = wait(&status);
454
if (ret == -1){
455
if(errno != ECHILD){
456
perror("wait");
457
}
458
break;
459
}
460
}
769
461
return exitstatus;
770
462
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0