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- Committer: Björn Påhlsson
- Date: 2008-08-15 20:17:32 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 77.
- Revision ID: belorn@braxen-20080815201732-b7uux3yqs05b3fy9
Added configuration files support for mandos-client
Removed plus argument support for mandos-client
Removed plus argument support for mandos-client
- files added:
- COPYING
- files removed:
- ca.pem
- files renamed:
- server.py => mandos
- plugbasedclient.c => mandos-client.c
- server.conf => mandos.conf
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- plugins.d/mandosclient.c => plugins.d/password-request.c
- files modified:
- Makefile
added
removed
mandos-client.c
21
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
22
*/
23
23
24
#include <stdio.h> /* popen(), fileno(), fprintf(),
25
stderr, STDOUT_FILENO */
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() */
26
42
#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() */
31
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
32
readdir(), closedir() */
33
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
readdir(), closedir(), dirfd() */
34
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
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() */
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> /* strsep, strlen(), strcpy(),
55
strcat() */
45
56
#include <errno.h> /* errno */
46
#include <argp.h> /* struct argp_option,
47
struct argp_state, struct argp,
48
argp_parse() */
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
#define CONFFILE "/conf/conf.d/mandos/client.conf"
69
70
const char *argp_program_version = "mandos-client 1.0";
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
49
72
50
73
struct process;
51
74
55
78
char *buffer;
56
79
size_t buffer_size;
57
80
size_t buffer_length;
81
bool eof;
82
bool completed;
83
int status;
58
84
struct process *next;
59
85
} process;
60
86
66
92
struct plugin *next;
67
93
} plugin;
68
94
69
plugin *getplugin(char *name, plugin **plugin_list){
95
static plugin *getplugin(char *name, plugin **plugin_list){
70
96
for (plugin *p = *plugin_list; p != NULL; p = p->next){
71
97
if ((p->name == name)
72
98
or (p->name and name and (strcmp(p->name, name) == 0))){
95
121
return new_plugin;
96
122
}
97
123
98
void addargument(plugin *p, char *arg){
124
static void addargument(plugin *p, char *arg){
99
125
p->argv[p->argc] = arg;
100
126
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
101
127
if (p->argv == NULL){
111
137
* Descriptor Flags".
112
138
* *Note File Descriptor Flags:(libc)Descriptor Flags.
113
139
*/
114
int set_cloexec_flag(int fd)
140
static int set_cloexec_flag(int fd)
115
141
{
116
142
int ret = fcntl(fd, F_GETFD, 0);
117
143
/* If reading the flags failed, return error indication now. */
122
148
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
123
149
}
124
150
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>";
151
process *process_list = NULL;
152
153
/* Mark a process as completed when it exits, and save its exit
154
status. */
155
void handle_sigchld(__attribute__((unused)) int sig){
156
process *proc = process_list;
157
int status;
158
pid_t pid = wait(&status);
159
if(pid == -1){
160
perror("wait");
161
return;
162
}
163
while(proc != NULL and proc->pid != pid){
164
proc = proc->next;
165
}
166
if(proc == NULL){
167
/* Process not found in process list */
168
return;
169
}
170
proc->status = status;
171
proc->completed = true;
172
}
173
174
bool print_out_password(const char *buffer, size_t length){
175
ssize_t ret;
176
if(length>0 and buffer[length-1] == '\n'){
177
length--;
178
}
179
for(size_t written = 0; written < length; written += (size_t)ret){
180
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
181
length - written));
182
if(ret < 0){
183
return false;
184
}
185
}
186
return true;
187
}
188
189
char ** addcustomargument(char **argv, int *argc, char *arg){
190
191
if (argv == NULL){
192
*argc = 1;
193
argv = malloc(sizeof(char*) * 2);
194
if(argv == NULL){
195
return NULL;
196
}
197
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
198
argv[1] = NULL;
199
}
200
*argc += 1;
201
argv = realloc(argv, sizeof(char *)
202
* ((unsigned int) *argc + 1));
203
if(argv == NULL){
204
return NULL;
205
}
206
argv[*argc-1] = arg;
207
argv[*argc] = NULL;
208
return argv;
209
}
132
210
133
211
int main(int argc, char *argv[]){
134
212
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
213
const char *conffile = CONFFILE;
214
FILE *conffp;
135
215
size_t d_name_len;
136
DIR *dir;
216
DIR *dir = NULL;
137
217
struct dirent *dirst;
138
218
struct stat st;
139
219
fd_set rfds_all;
140
220
int ret, maxfd = 0;
141
process *process_list = NULL;
221
uid_t uid = 65534;
222
gid_t gid = 65534;
142
223
bool debug = false;
143
224
int exitstatus = EXIT_SUCCESS;
225
struct sigaction old_sigchld_action;
226
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
227
.sa_flags = SA_NOCLDSTOP };
228
char **custom_argv = NULL;
229
int custom_argc = 0;
230
231
/* Establish a signal handler */
232
sigemptyset(&sigchld_action.sa_mask);
233
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
234
if(ret < 0){
235
perror("sigaddset");
236
exit(EXIT_FAILURE);
237
}
238
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
239
if(ret < 0){
240
perror("sigaction");
241
exit(EXIT_FAILURE);
242
}
144
243
145
244
/* The options we understand. */
146
245
struct argp_option options[] = {
156
255
{ .name = "plugin-dir", .key = 128,
157
256
.arg = "DIRECTORY",
158
257
.doc = "Specify a different plugin directory", .group = 2 },
159
{ .name = "debug", .key = 129,
258
{ .name = "userid", .key = 129,
259
.arg = "ID", .flags = 0,
260
.doc = "User ID the plugins will run as", .group = 2 },
261
{ .name = "groupid", .key = 130,
262
.arg = "ID", .flags = 0,
263
.doc = "Group ID the plugins will run as", .group = 2 },
264
{ .name = "debug", .key = 131,
160
265
.doc = "Debug mode", .group = 3 },
161
266
{ .name = NULL }
162
267
};
163
268
164
269
error_t parse_opt (int key, char *arg, struct argp_state *state) {
165
/* Get the INPUT argument from `argp_parse', which we
166
know is a pointer to our plugin list pointer. */
270
/* Get the INPUT argument from `argp_parse', which we know is a
271
pointer to our plugin list pointer. */
167
272
plugin **plugins = state->input;
168
273
switch (key) {
169
274
case 'g':
170
275
if (arg != NULL){
171
char *p = strtok(arg, ",");
172
do{
276
char *p;
277
while((p = strsep(&arg, ",")) != NULL){
278
if(p[0] == '\0'){
279
continue;
280
}
173
281
addargument(getplugin(NULL, plugins), p);
174
p = strtok(NULL, ",");
175
} while (p);
282
}
176
283
}
177
284
break;
178
285
case 'o':
179
286
if (arg != NULL){
180
char *name = strtok(arg, ":");
181
char *p = strtok(NULL, ":");
182
if(p){
183
p = strtok(p, ",");
184
do{
287
char *name = strsep(&arg, ":");
288
if(name[0] == '\0'){
289
break;
290
}
291
char *opt = strsep(&arg, ":");
292
if(opt[0] == '\0'){
293
break;
294
}
295
if(opt != NULL){
296
char *p;
297
while((p = strsep(&opt, ",")) != NULL){
298
if(p[0] == '\0'){
299
continue;
300
}
185
301
addargument(getplugin(name, plugins), p);
186
p = strtok(NULL, ",");
187
} while (p);
302
}
188
303
}
189
304
}
190
305
break;
197
312
plugindir = arg;
198
313
break;
199
314
case 129:
315
uid = (uid_t)strtol(arg, NULL, 10);
316
break;
317
case 130:
318
gid = (gid_t)strtol(arg, NULL, 10);
319
break;
320
case 131:
200
321
debug = true;
201
322
break;
202
323
case ARGP_KEY_ARG:
203
argp_usage (state);
324
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
204
325
break;
205
326
case ARGP_KEY_END:
206
327
break;
213
334
plugin *plugin_list = NULL;
214
335
215
336
struct argp argp = { .options = options, .parser = parse_opt,
216
.args_doc = "",
337
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
217
338
.doc = "Mandos plugin runner -- Run plugins" };
218
339
219
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
340
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
341
if (ret == ARGP_ERR_UNKNOWN){
342
fprintf(stderr, "Unknown error while parsing arguments\n");
343
exitstatus = EXIT_FAILURE;
344
goto end;
345
}
346
347
conffp = fopen(conffile, "r");
348
if(conffp != NULL){
349
char *org_line = NULL;
350
size_t size = 0;
351
ssize_t sret;
352
char *p, *arg, *new_arg, *line;
353
const char whitespace_delims[] = " \r\t\f\v\n";
354
const char comment_delim[] = "#";
355
356
while(true){
357
sret = getline(&org_line, &size, conffp);
358
if(sret == -1){
359
break;
360
}
361
362
line = org_line;
363
arg = strsep(&line, comment_delim);
364
while((p = strsep(&arg, whitespace_delims)) != NULL){
365
if(p[0] == '\0'){
366
continue;
367
}
368
new_arg = strdup(p);
369
custom_argv = addcustomargument(custom_argv, &custom_argc, new_arg);
370
if (custom_argv == NULL){
371
perror("addcustomargument");
372
exitstatus = EXIT_FAILURE;
373
goto end;
374
}
375
}
376
}
377
free(org_line);
378
} else{
379
/* check for harmfull errors */
380
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
381
perror("fopen");
382
exitstatus = EXIT_FAILURE;
383
goto end;
384
}
385
}
386
387
if(custom_argv != NULL){
388
custom_argv[0] = argv[0];
389
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
390
if (ret == ARGP_ERR_UNKNOWN){
391
fprintf(stderr, "Unknown error while parsing arguments\n");
392
exitstatus = EXIT_FAILURE;
393
goto end;
394
}
395
}
220
396
221
397
if(debug){
222
398
for(plugin *p = plugin_list; p != NULL; p=p->next){
228
404
}
229
405
}
230
406
407
ret = setuid(uid);
408
if (ret == -1){
409
perror("setuid");
410
}
411
412
setgid(gid);
413
if (ret == -1){
414
perror("setgid");
415
}
416
231
417
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
239
418
if(dir == NULL){
240
fprintf(stderr, "Can not open directory\n");
241
return EXIT_FAILURE;
419
perror("Could not open plugin dir");
420
exitstatus = EXIT_FAILURE;
421
goto end;
422
}
423
424
/* Set the FD_CLOEXEC flag on the directory, if possible */
425
{
426
int dir_fd = dirfd(dir);
427
if(dir_fd >= 0){
428
ret = set_cloexec_flag(dir_fd);
429
if(ret < 0){
430
perror("set_cloexec_flag");
431
exitstatus = EXIT_FAILURE;
432
goto end;
433
}
434
}
242
435
}
243
436
244
437
FD_ZERO(&rfds_all);
248
441
249
442
// All directory entries have been processed
250
443
if(dirst == NULL){
444
if (errno == EBADF){
445
perror("readdir");
446
exitstatus = EXIT_FAILURE;
447
goto end;
448
}
251
449
break;
252
450
}
253
451
267
465
if((d_name_len >= pre_len)
268
466
and strncmp((dirst->d_name), *pre, pre_len) == 0){
269
467
if(debug){
270
fprintf(stderr, "Ignoring plugin dir entry name \"%s\""
468
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
271
469
" with bad prefix %s\n", dirst->d_name, *pre);
272
470
}
273
471
bad_name = true;
285
483
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
286
484
== 0)){
287
485
if(debug){
288
fprintf(stderr, "Ignoring plugin dir entry name \"%s\""
486
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
289
487
" with bad suffix %s\n", dirst->d_name, *suf);
290
488
}
291
489
bad_name = true;
301
499
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
302
500
if (filename == NULL){
303
501
perror("malloc");
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
502
continue;
503
}
504
strcpy(filename, plugindir); /* Spurious warning */
505
strcat(filename, "/"); /* Spurious warning */
506
strcat(filename, dirst->d_name); /* Spurious warning */
507
508
ret = stat(filename, &st);
509
if (ret == -1){
510
perror("stat");
511
free(filename);
512
continue;
513
}
514
313
515
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
314
516
if(debug){
315
fprintf(stderr, "Ignoring plugin dir entry name \"%s\""
517
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
316
518
" with bad type or mode\n", filename);
317
519
}
520
free(filename);
318
521
continue;
319
522
}
320
523
if(getplugin(dirst->d_name, &plugin_list)->disabled){
321
524
if(debug){
322
fprintf(stderr, "Ignoring disabled plugin \"%s\"",
525
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
323
526
dirst->d_name);
324
527
}
528
free(filename);
325
529
continue;
326
530
}
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
}
334
531
plugin *p = getplugin(dirst->d_name, &plugin_list);
335
532
{
336
533
/* Add global arguments to argument list for this plugin */
339
536
addargument(p, *a);
340
537
}
341
538
}
539
int pipefd[2];
540
ret = pipe(pipefd);
541
if (ret == -1){
542
perror("pipe");
543
exitstatus = EXIT_FAILURE;
544
goto end;
545
}
546
ret = set_cloexec_flag(pipefd[0]);
547
if(ret < 0){
548
perror("set_cloexec_flag");
549
exitstatus = EXIT_FAILURE;
550
goto end;
551
}
552
ret = set_cloexec_flag(pipefd[1]);
553
if(ret < 0){
554
perror("set_cloexec_flag");
555
exitstatus = EXIT_FAILURE;
556
goto end;
557
}
558
/* Block SIGCHLD until process is safely in process list */
559
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
560
if(ret < 0){
561
perror("sigprocmask");
562
exitstatus = EXIT_FAILURE;
563
goto end;
564
}
565
// Starting a new process to be watched
342
566
pid_t pid = fork();
567
if(pid == -1){
568
perror("fork");
569
exitstatus = EXIT_FAILURE;
570
goto end;
571
}
343
572
if(pid == 0){
344
573
/* this is the child process */
345
closedir(dir);
346
close(pipefd[0]); /* close unused read end of pipe */
347
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
574
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
575
if(ret < 0){
576
perror("sigaction");
577
_exit(EXIT_FAILURE);
578
}
579
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
580
if(ret < 0){
581
perror("sigprocmask");
582
_exit(EXIT_FAILURE);
583
}
584
585
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
586
if(ret == -1){
587
perror("dup2");
588
_exit(EXIT_FAILURE);
589
}
348
590
591
if(dirfd(dir) < 0){
592
/* If dir has no file descriptor, we could not set FD_CLOEXEC
593
above and must now close it manually here. */
594
closedir(dir);
595
}
349
596
if(execv(filename, p->argv) < 0){
350
perror(argv[0]);
351
close(pipefd[1]);
597
perror("execv");
352
598
_exit(EXIT_FAILURE);
353
599
}
354
600
/* no return */
355
601
}
602
/* parent process */
603
free(filename);
356
604
close(pipefd[1]); /* close unused write end of pipe */
357
605
process *new_process = malloc(sizeof(process));
358
606
if (new_process == NULL){
359
607
perror("malloc");
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;
608
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
609
if(ret < 0){
610
perror("sigprocmask");
611
}
612
exitstatus = EXIT_FAILURE;
613
goto end;
614
}
615
616
*new_process = (struct process){ .pid = pid,
617
.fd = pipefd[0],
618
.next = process_list };
619
// List handling
620
process_list = new_process;
621
/* Unblock SIGCHLD so signal handler can be run if this process
622
has already completed */
623
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
624
if(ret < 0){
625
perror("sigprocmask");
626
exitstatus = EXIT_FAILURE;
627
goto end;
628
}
629
373
630
FD_SET(new_process->fd, &rfds_all);
374
631
375
632
if (maxfd < new_process->fd){
376
633
maxfd = new_process->fd;
377
634
}
378
635
379
//List handling
380
new_process->next = process_list;
381
process_list = new_process;
636
}
637
638
/* Free the plugin list */
639
for(plugin *next; plugin_list != NULL; plugin_list = next){
640
next = plugin_list->next;
641
free(plugin_list->argv);
642
free(plugin_list);
382
643
}
383
644
384
645
closedir(dir);
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);
646
dir = NULL;
647
648
if (process_list == NULL){
649
fprintf(stderr, "No plugin processes started. Incorrect plugin"
650
" directory?\n");
651
process_list = NULL;
652
}
653
while(process_list){
654
fd_set rfds = rfds_all;
655
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
656
if (select_ret == -1){
657
perror("select");
658
exitstatus = EXIT_FAILURE;
659
goto end;
660
}
661
/* OK, now either a process completed, or something can be read
662
from one of them */
663
for(process *proc = process_list; proc ; proc = proc->next){
664
/* Is this process completely done? */
665
if(proc->eof and proc->completed){
666
/* Only accept the plugin output if it exited cleanly */
667
if(not WIFEXITED(proc->status)
668
or WEXITSTATUS(proc->status) != 0){
669
/* Bad exit by plugin */
670
if(debug){
671
if(WIFEXITED(proc->status)){
672
fprintf(stderr, "Plugin %u exited with status %d\n",
673
(unsigned int) (proc->pid),
674
WEXITSTATUS(proc->status));
675
} else if(WIFSIGNALED(proc->status)) {
676
fprintf(stderr, "Plugin %u killed by signal %d\n",
677
(unsigned int) (proc->pid),
678
WTERMSIG(proc->status));
679
} else if(WCOREDUMP(proc->status)){
680
fprintf(stderr, "Plugin %d dumped core\n",
681
(unsigned int) (proc->pid));
682
}
683
}
684
/* Remove the plugin */
685
FD_CLR(proc->fd, &rfds_all);
686
/* Block signal while modifying process_list */
687
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
688
if(ret < 0){
689
perror("sigprocmask");
690
exitstatus = EXIT_FAILURE;
691
goto end;
692
}
693
/* Delete this process entry from the list */
694
if(process_list == proc){
695
/* First one - simple */
696
process_list = proc->next;
697
} else {
698
/* Second one or later */
699
for(process *p = process_list; p != NULL; p = p->next){
700
if(p->next == proc){
701
p->next = proc->next;
702
break;
435
703
}
436
704
}
437
705
}
438
}
706
/* We are done modifying process list, so unblock signal */
707
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
708
NULL);
709
if(ret < 0){
710
perror("sigprocmask");
711
}
712
free(proc->buffer);
713
free(proc);
714
/* We deleted this process from the list, so we can't go
715
proc->next. Therefore, start over from the beginning of
716
the process list */
717
break;
718
}
719
/* This process exited nicely, so print its buffer */
720
721
bool bret = print_out_password(proc->buffer, proc->buffer_length);
722
if(not bret){
723
perror("print_out_password");
724
exitstatus = EXIT_FAILURE;
725
}
726
goto end;
727
}
728
/* This process has not completed. Does it have any output? */
729
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
730
/* This process had nothing to say at this time */
731
continue;
732
}
733
/* Before reading, make the process' data buffer large enough */
734
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
735
proc->buffer = realloc(proc->buffer, proc->buffer_size
736
+ (size_t) BUFFER_SIZE);
737
if (proc->buffer == NULL){
738
perror("malloc");
739
exitstatus = EXIT_FAILURE;
740
goto end;
741
}
742
proc->buffer_size += BUFFER_SIZE;
743
}
744
/* Read from the process */
745
ret = read(proc->fd, proc->buffer + proc->buffer_length,
746
BUFFER_SIZE);
747
if(ret < 0){
748
/* Read error from this process; ignore the error */
749
continue;
750
}
751
if(ret == 0){
752
/* got EOF */
753
proc->eof = true;
754
} else {
755
proc->buffer_length += (size_t) ret;
439
756
}
440
757
}
441
758
}
442
759
760
443
761
end:
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
}
762
763
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
764
/* Fallback if all plugins failed, none are found or an error occured */
765
bool bret;
766
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
767
char *passwordbuffer = getpass("Password: ");
768
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
769
if(not bret){
770
perror("print_out_password");
771
exitstatus = EXIT_FAILURE;
772
goto end;
773
}
774
}
775
776
/* Restore old signal handler */
777
sigaction(SIGCHLD, &old_sigchld_action, NULL);
778
779
free(custom_argv);
780
781
/* Free the plugin list */
782
for(plugin *next; plugin_list != NULL; plugin_list = next){
783
next = plugin_list->next;
784
free(plugin_list->argv);
785
free(plugin_list);
786
}
787
788
if(dir != NULL){
789
closedir(dir);
790
}
791
792
/* Free the process list and kill the processes */
793
for(process *next; process_list != NULL; process_list = next){
794
next = process_list->next;
795
close(process_list->fd);
796
ret = kill(process_list->pid, SIGTERM);
797
if(ret == -1 and errno != ESRCH){
798
/* set-uid proccesses migth not get closed */
799
perror("kill");
800
}
801
free(process_list->buffer);
802
free(process_list);
803
}
804
805
/* Wait for any remaining child processes to terminate */
806
do{
807
ret = wait(NULL);
808
} while(ret >= 0);
809
if(errno != ECHILD){
810
perror("wait");
811
}
812
461
813
return exitstatus;
462
814
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0