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- Committer: Björn Påhlsson
- Date: 2008-08-02 15:47:42 UTC
- mfrom: (36 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 38.
- Revision ID: belorn@braxen-20080802154742-pixsom1utki8x3yo
merge
- files added:
- ca.pem
- files removed:
- .bzrignore
- files renamed:
- plugin-runner.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(), getline(),
25
asprintf() */
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
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
26
#include <stdio.h> /* popen(), fileno(), fprintf(),
27
stderr, STDOUT_FILENO */
42
28
#include <iso646.h> /* and, or, not */
29
#include <sys/types.h> /* DIR, opendir(), stat(),
30
struct stat, waitpid(),
31
WIFEXITED(), WEXITSTATUS(),
32
wait() */
33
#include <sys/wait.h> /* wait() */
43
34
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
35
readdir(), closedir() */
36
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
45
37
#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> /* strsep, strlen(), asprintf() */
38
fcntl() */
39
#include <fcntl.h> /* fcntl() */
40
#include <stddef.h> /* NULL */
41
#include <stdlib.h> /* EXIT_FAILURE */
42
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
43
FD_SET(), FD_ISSET() */
44
#include <string.h> /* strlen(), strcpy(), strcat() */
45
#include <stdbool.h> /* true */
46
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
47
WEXITSTATUS() */
55
48
#include <errno.h> /* errno */
56
#include <argp.h> /* struct argp_option, struct
57
argp_state, struct argp,
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
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
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
49
#include <argp.h> /* struct argp_option,
50
struct argp_state, struct argp,
51
argp_parse() */
74
52
75
53
struct process;
76
54
81
59
size_t buffer_size;
82
60
size_t buffer_length;
83
61
bool eof;
84
volatile bool completed;
85
volatile int status;
62
bool completed;
63
int status;
86
64
struct process *next;
87
65
} process;
88
66
90
68
char *name; /* can be NULL or any plugin name */
91
69
char **argv;
92
70
int argc;
93
char **environ;
94
int envc;
95
71
bool disabled;
96
72
struct plugin *next;
97
73
} plugin;
98
74
99
static plugin *getplugin(char *name, plugin **plugin_list){
75
plugin *getplugin(char *name, plugin **plugin_list){
100
76
for (plugin *p = *plugin_list; p != NULL; p = p->next){
101
77
if ((p->name == name)
102
78
or (p->name and name and (strcmp(p->name, name) == 0))){
106
82
/* Create a new plugin */
107
83
plugin *new_plugin = malloc(sizeof(plugin));
108
84
if (new_plugin == NULL){
109
return NULL;
110
}
111
char *copy_name = NULL;
112
if(name != NULL){
113
copy_name = strdup(name);
114
if(copy_name == NULL){
115
return NULL;
116
}
117
}
118
119
*new_plugin = (plugin) { .name = copy_name,
120
.argc = 1,
121
.envc = 0,
122
.disabled = false,
123
.next = *plugin_list };
124
85
perror("malloc");
86
exit(EXIT_FAILURE);
87
}
88
new_plugin->name = name;
125
89
new_plugin->argv = malloc(sizeof(char *) * 2);
126
90
if (new_plugin->argv == NULL){
127
free(copy_name);
128
free(new_plugin);
129
return NULL;
91
perror("malloc");
92
exit(EXIT_FAILURE);
130
93
}
131
new_plugin->argv[0] = copy_name;
94
new_plugin->argv[0] = name;
132
95
new_plugin->argv[1] = NULL;
133
134
new_plugin->environ = malloc(sizeof(char *));
135
if(new_plugin->environ == NULL){
136
free(copy_name);
137
free(new_plugin->argv);
138
free(new_plugin);
139
return NULL;
140
}
141
new_plugin->environ[0] = NULL;
96
new_plugin->argc = 1;
97
new_plugin->disabled = false;
98
new_plugin->next = *plugin_list;
142
99
/* Append the new plugin to the list */
143
100
*plugin_list = new_plugin;
144
101
return new_plugin;
145
102
}
146
103
147
/* Helper function for add_argument and add_environment */
148
static bool add_to_char_array(const char *new, char ***array,
149
int *len){
150
/* Resize the pointed-to array to hold one more pointer */
151
*array = realloc(*array, sizeof(char *)
152
* (size_t) ((*len) + 2));
153
/* Malloc check */
154
if(*array == NULL){
155
return false;
156
}
157
/* Make a copy of the new string */
158
char *copy = strdup(new);
159
if(copy == NULL){
160
return false;
161
}
162
/* Insert the copy */
163
(*array)[*len] = copy;
164
(*len)++;
165
/* Add a new terminating NULL pointer to the last element */
166
(*array)[*len] = NULL;
167
return true;
168
}
169
170
/* Add to a plugin's argument vector */
171
static bool add_argument(plugin *p, const char *arg){
172
if(p == NULL){
173
return false;
174
}
175
return add_to_char_array(arg, &(p->argv), &(p->argc));
176
}
177
178
/* Add to a plugin's environment */
179
static bool add_environment(plugin *p, const char *def){
180
if(p == NULL){
181
return false;
182
}
183
return add_to_char_array(def, &(p->environ), &(p->envc));
184
}
185
104
void addargument(plugin *p, char *arg){
105
p->argv[p->argc] = arg;
106
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
107
if (p->argv == NULL){
108
perror("malloc");
109
exit(EXIT_FAILURE);
110
}
111
p->argc++;
112
p->argv[p->argc] = NULL;
113
}
186
114
187
115
/*
188
116
* Based on the example in the GNU LibC manual chapter 13.13 "File
189
117
* Descriptor Flags".
190
118
* *Note File Descriptor Flags:(libc)Descriptor Flags.
191
119
*/
192
static int set_cloexec_flag(int fd)
120
int set_cloexec_flag(int fd)
193
121
{
194
122
int ret = fcntl(fd, F_GETFD, 0);
195
123
/* If reading the flags failed, return error indication now. */
200
128
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
201
129
}
202
130
131
#define BUFFER_SIZE 256
132
133
const char *argp_program_version = "plugbasedclient 0.9";
134
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
135
203
136
process *process_list = NULL;
204
137
205
/* Mark processes as completed when they exit, and save their exit
138
/* Mark a process as completed when it exits, and save its exit
206
139
status. */
207
140
void handle_sigchld(__attribute__((unused)) int sig){
208
while(true){
209
process *proc = process_list;
210
int status;
211
pid_t pid = waitpid(-1, &status, WNOHANG);
212
if(pid == 0){
213
/* Only still running child processes */
214
break;
215
}
216
if(pid == -1){
217
if (errno != ECHILD){
218
perror("waitpid");
219
}
220
/* No child processes */
221
break;
222
}
223
224
/* A child exited, find it in process_list */
225
while(proc != NULL and proc->pid != pid){
226
proc = proc->next;
227
}
228
if(proc == NULL){
229
/* Process not found in process list */
230
continue;
231
}
232
proc->status = status;
233
proc->completed = true;
234
}
235
}
236
237
bool print_out_password(const char *buffer, size_t length){
238
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
242
for(size_t written = 0; written < length; written += (size_t)ret){
243
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
244
length - written));
245
if(ret < 0){
246
return false;
247
}
248
}
249
return true;
250
}
251
252
static void free_plugin_list(plugin *plugin_list){
253
for(plugin *next; plugin_list != NULL; plugin_list = next){
254
next = plugin_list->next;
255
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
256
free(*arg);
257
}
258
free(plugin_list->argv);
259
for(char **env = plugin_list->environ; *env != NULL; env++){
260
free(*env);
261
}
262
free(plugin_list->environ);
263
free(plugin_list);
264
}
141
process *proc = process_list;
142
int status;
143
pid_t pid = wait(&status);
144
while(proc != NULL and proc->pid != pid){
145
proc = proc->next;
146
}
147
if(proc == NULL){
148
/* Process not found in process list */
149
return;
150
}
151
proc->status = status;
152
proc->completed = true;
265
153
}
266
154
267
155
int main(int argc, char *argv[]){
268
char *plugindir = NULL;
269
char *argfile = NULL;
270
FILE *conffp;
156
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
271
157
size_t d_name_len;
272
158
DIR *dir = NULL;
273
159
struct dirent *dirst;
281
167
struct sigaction old_sigchld_action;
282
168
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
283
169
.sa_flags = SA_NOCLDSTOP };
284
char **custom_argv = NULL;
285
int custom_argc = 0;
286
170
287
171
/* Establish a signal handler */
288
172
sigemptyset(&sigchld_action.sa_mask);
289
173
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
290
if(ret == -1){
174
if(ret < 0){
291
175
perror("sigaddset");
292
exitstatus = EXIT_FAILURE;
293
goto fallback;
176
exit(EXIT_FAILURE);
294
177
}
295
178
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
296
if(ret == -1){
179
if(ret < 0){
297
180
perror("sigaction");
298
exitstatus = EXIT_FAILURE;
299
goto fallback;
181
exit(EXIT_FAILURE);
300
182
}
301
183
302
184
/* The options we understand. */
304
186
{ .name = "global-options", .key = 'g',
305
187
.arg = "OPTION[,OPTION[,...]]",
306
188
.doc = "Options passed to all plugins" },
307
{ .name = "global-envs", .key = 'e',
308
.arg = "VAR=value",
309
.doc = "Environment variable passed to all plugins" },
310
189
{ .name = "options-for", .key = 'o',
311
190
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
312
191
.doc = "Options passed only to specified plugin" },
313
{ .name = "envs-for", .key = 'f',
314
.arg = "PLUGIN:ENV=value",
315
.doc = "Environment variable passed to specified plugin" },
316
192
{ .name = "disable", .key = 'd',
317
193
.arg = "PLUGIN",
318
194
.doc = "Disable a specific plugin", .group = 1 },
319
195
{ .name = "plugin-dir", .key = 128,
320
196
.arg = "DIRECTORY",
321
197
.doc = "Specify a different plugin directory", .group = 2 },
322
{ .name = "config-file", .key = 129,
323
.arg = "FILE",
324
.doc = "Specify a different configuration file", .group = 2 },
325
{ .name = "userid", .key = 130,
326
.arg = "ID", .flags = 0,
327
.doc = "User ID the plugins will run as", .group = 3 },
328
{ .name = "groupid", .key = 131,
329
.arg = "ID", .flags = 0,
330
.doc = "Group ID the plugins will run as", .group = 3 },
331
{ .name = "debug", .key = 132,
332
.doc = "Debug mode", .group = 4 },
198
{ .name = "userid", .key = 129,
199
.arg = "ID", .flags = 0,
200
.doc = "User ID the plugins will run as", .group = 2 },
201
{ .name = "groupid", .key = 130,
202
.arg = "ID", .flags = 0,
203
.doc = "Group ID the plugins will run as", .group = 2 },
204
{ .name = "debug", .key = 131,
205
.doc = "Debug mode", .group = 3 },
333
206
{ .name = NULL }
334
207
};
335
208
340
213
switch (key) {
341
214
case 'g':
342
215
if (arg != NULL){
343
char *p;
344
while((p = strsep(&arg, ",")) != NULL){
345
if(p[0] == '\0'){
346
continue;
347
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
349
perror("add_argument");
350
return ARGP_ERR_UNKNOWN;
351
}
352
}
353
}
354
break;
355
case 'e':
356
if(arg == NULL){
357
break;
358
}
359
{
360
char *envdef = strdup(arg);
361
if(envdef == NULL){
362
break;
363
}
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
366
}
216
char *p = strtok(arg, ",");
217
do{
218
addargument(getplugin(NULL, plugins), p);
219
p = strtok(NULL, ",");
220
} while (p);
367
221
}
368
222
break;
369
223
case 'o':
370
224
if (arg != NULL){
371
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
373
break;
374
}
375
char *opt = strsep(&arg, ":");
376
if(opt[0] == '\0'){
377
break;
378
}
379
if(opt != NULL){
380
char *p;
381
while((p = strsep(&opt, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(p_name, plugins), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
388
}
389
}
390
}
391
}
392
break;
393
case 'f':
394
if(arg == NULL){
395
break;
396
}
397
{
398
char *envdef = strchr(arg, ':');
399
if(envdef == NULL){
400
break;
401
}
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
406
envdef++;
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
408
perror("add_environment");
225
char *name = strtok(arg, ":");
226
char *p = strtok(NULL, ":");
227
if(p){
228
p = strtok(p, ",");
229
do{
230
addargument(getplugin(name, plugins), p);
231
p = strtok(NULL, ",");
232
} while (p);
409
233
}
410
234
}
411
235
break;
412
236
case 'd':
413
237
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
415
if(p == NULL){
416
return ARGP_ERR_UNKNOWN;
417
}
418
p->disabled = true;
238
getplugin(arg, plugins)->disabled = true;
419
239
}
420
240
break;
421
241
case 128:
422
plugindir = strdup(arg);
423
if(plugindir == NULL){
424
perror("strdup");
425
}
242
plugindir = arg;
426
243
break;
427
244
case 129:
428
argfile = strdup(arg);
429
if(argfile == NULL){
430
perror("strdup");
431
}
432
break;
245
uid = (uid_t)strtol(arg, NULL, 10);
246
break;
433
247
case 130:
434
uid = (uid_t)strtol(arg, NULL, 10);
248
gid = (gid_t)strtol(arg, NULL, 10);
435
249
break;
436
250
case 131:
437
gid = (gid_t)strtol(arg, NULL, 10);
438
break;
439
case 132:
440
251
debug = true;
441
252
break;
442
253
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
254
argp_usage (state);
444
255
break;
445
256
case ARGP_KEY_END:
446
257
break;
453
264
plugin *plugin_list = NULL;
454
265
455
266
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
267
.args_doc = "",
457
268
.doc = "Mandos plugin runner -- Run plugins" };
458
269
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
460
if (ret == ARGP_ERR_UNKNOWN){
461
fprintf(stderr, "Unknown error while parsing arguments\n");
462
exitstatus = EXIT_FAILURE;
463
goto fallback;
464
}
465
466
if (argfile == NULL){
467
conffp = fopen(AFILE, "r");
468
} else {
469
conffp = fopen(argfile, "r");
470
}
471
472
if(conffp != NULL){
473
char *org_line = NULL;
474
char *p, *arg, *new_arg, *line;
475
size_t size = 0;
476
ssize_t sret;
477
const char whitespace_delims[] = " \r\t\f\v\n";
478
const char comment_delim[] = "#";
479
480
custom_argc = 1;
481
custom_argv = malloc(sizeof(char*) * 2);
482
if(custom_argv == NULL){
483
perror("malloc");
484
exitstatus = EXIT_FAILURE;
485
goto fallback;
486
}
487
custom_argv[0] = argv[0];
488
custom_argv[1] = NULL;
489
490
while(true){
491
sret = getline(&org_line, &size, conffp);
492
if(sret == -1){
493
break;
494
}
495
496
line = org_line;
497
arg = strsep(&line, comment_delim);
498
while((p = strsep(&arg, whitespace_delims)) != NULL){
499
if(p[0] == '\0'){
500
continue;
501
}
502
new_arg = strdup(p);
503
if(new_arg == NULL){
504
perror("strdup");
505
exitstatus = EXIT_FAILURE;
506
free(org_line);
507
goto fallback;
508
}
509
510
custom_argc += 1;
511
custom_argv = realloc(custom_argv, sizeof(char *)
512
* ((unsigned int) custom_argc + 1));
513
if(custom_argv == NULL){
514
perror("realloc");
515
exitstatus = EXIT_FAILURE;
516
free(org_line);
517
goto fallback;
518
}
519
custom_argv[custom_argc-1] = new_arg;
520
custom_argv[custom_argc] = NULL;
521
}
522
}
523
free(org_line);
524
} else{
525
/* Check for harmful errors and go to fallback. Other errors might
526
not affect opening plugins */
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
528
perror("fopen");
529
exitstatus = EXIT_FAILURE;
530
goto fallback;
531
}
532
}
533
534
if(custom_argv != NULL){
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
536
if (ret == ARGP_ERR_UNKNOWN){
537
fprintf(stderr, "Unknown error while parsing arguments\n");
538
exitstatus = EXIT_FAILURE;
539
goto fallback;
540
}
541
}
542
270
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
271
543
272
if(debug){
544
273
for(plugin *p = plugin_list; p != NULL; p=p->next){
545
274
fprintf(stderr, "Plugin: %s has %d arguments\n",
547
276
for(char **a = p->argv; *a != NULL; a++){
548
277
fprintf(stderr, "\tArg: %s\n", *a);
549
278
}
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
551
for(char **a = p->environ; *a != NULL; a++){
552
fprintf(stderr, "\t%s\n", *a);
553
}
554
279
}
555
280
}
556
281
557
282
ret = setuid(uid);
558
283
if (ret == -1){
559
284
perror("setuid");
561
286
562
287
setgid(gid);
563
288
if (ret == -1){
564
perror("setgid");
565
}
566
567
if (plugindir == NULL){
568
dir = opendir(PDIR);
569
} else {
570
dir = opendir(plugindir);
289
perror("setuid");
571
290
}
572
291
292
dir = opendir(plugindir);
573
293
if(dir == NULL){
574
294
perror("Could not open plugin dir");
575
295
exitstatus = EXIT_FAILURE;
576
goto fallback;
296
goto end;
577
297
}
578
298
579
299
/* Set the FD_CLOEXEC flag on the directory, if possible */
584
304
if(ret < 0){
585
305
perror("set_cloexec_flag");
586
306
exitstatus = EXIT_FAILURE;
587
goto fallback;
307
goto end;
588
308
}
589
309
}
590
310
}
596
316
597
317
// All directory entries have been processed
598
318
if(dirst == NULL){
599
if (errno == EBADF){
600
perror("readdir");
601
exitstatus = EXIT_FAILURE;
602
goto fallback;
603
}
604
319
break;
605
320
}
606
321
650
365
continue;
651
366
}
652
367
}
653
654
char *filename;
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
656
if(ret < 0){
657
perror("asprintf");
658
continue;
659
}
660
661
ret = stat(filename, &st);
662
if (ret == -1){
663
perror("stat");
664
free(filename);
665
continue;
666
}
368
369
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
370
if (filename == NULL){
371
perror("malloc");
372
exitstatus = EXIT_FAILURE;
373
goto end;
374
}
375
strcpy(filename, plugindir); /* Spurious warning */
376
strcat(filename, "/"); /* Spurious warning */
377
strcat(filename, dirst->d_name); /* Spurious warning */
378
379
stat(filename, &st);
667
380
668
381
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
669
382
if(debug){
673
386
free(filename);
674
387
continue;
675
388
}
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
677
if(p == NULL){
678
perror("getplugin");
679
free(filename);
680
continue;
681
}
682
if(p->disabled){
389
if(getplugin(dirst->d_name, &plugin_list)->disabled){
683
390
if(debug){
684
391
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
685
392
dirst->d_name);
687
394
free(filename);
688
395
continue;
689
396
}
397
plugin *p = getplugin(dirst->d_name, &plugin_list);
690
398
{
691
399
/* Add global arguments to argument list for this plugin */
692
400
plugin *g = getplugin(NULL, &plugin_list);
693
if(g != NULL){
694
for(char **a = g->argv + 1; *a != NULL; a++){
695
if(not add_argument(p, *a)){
696
perror("add_argument");
697
}
698
}
699
/* Add global environment variables */
700
for(char **e = g->environ; *e != NULL; e++){
701
if(not add_environment(p, *e)){
702
perror("add_environment");
703
}
704
}
705
}
706
}
707
/* If this plugin has any environment variables, we will call
708
using execve and need to duplicate the environment from this
709
process, too. */
710
if(p->environ[0] != NULL){
711
for(char **e = environ; *e != NULL; e++){
712
char *copy = strdup(*e);
713
if(copy == NULL){
714
perror("strdup");
715
continue;
716
}
717
if(not add_environment(p, copy)){
718
perror("add_environment");
719
}
720
}
721
}
722
723
int pipefd[2];
401
for(char **a = g->argv + 1; *a != NULL; a++){
402
addargument(p, *a);
403
}
404
}
405
int pipefd[2];
724
406
ret = pipe(pipefd);
725
407
if (ret == -1){
726
408
perror("pipe");
727
409
exitstatus = EXIT_FAILURE;
728
goto fallback;
410
goto end;
729
411
}
730
412
ret = set_cloexec_flag(pipefd[0]);
731
413
if(ret < 0){
732
414
perror("set_cloexec_flag");
733
415
exitstatus = EXIT_FAILURE;
734
goto fallback;
416
goto end;
735
417
}
736
418
ret = set_cloexec_flag(pipefd[1]);
737
419
if(ret < 0){
738
420
perror("set_cloexec_flag");
739
421
exitstatus = EXIT_FAILURE;
740
goto fallback;
422
goto end;
741
423
}
742
424
/* Block SIGCHLD until process is safely in process list */
743
425
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
744
426
if(ret < 0){
745
427
perror("sigprocmask");
746
428
exitstatus = EXIT_FAILURE;
747
goto fallback;
429
goto end;
748
430
}
749
431
// Starting a new process to be watched
750
432
pid_t pid = fork();
751
if(pid == -1){
752
perror("fork");
753
exitstatus = EXIT_FAILURE;
754
goto fallback;
755
}
756
433
if(pid == 0){
757
434
/* this is the child process */
758
435
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
765
442
perror("sigprocmask");
766
443
_exit(EXIT_FAILURE);
767
444
}
768
769
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
770
if(ret == -1){
771
perror("dup2");
772
_exit(EXIT_FAILURE);
773
}
445
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
774
446
775
447
if(dirfd(dir) < 0){
776
448
/* If dir has no file descriptor, we could not set FD_CLOEXEC
777
449
above and must now close it manually here. */
778
450
closedir(dir);
779
451
}
780
if(p->environ[0] == NULL){
781
if(execv(filename, p->argv) < 0){
782
perror("execv");
783
_exit(EXIT_FAILURE);
784
}
785
} else {
786
if(execve(filename, p->argv, p->environ) < 0){
787
perror("execve");
788
_exit(EXIT_FAILURE);
789
}
452
if(execv(filename, p->argv) < 0){
453
perror("execv");
454
_exit(EXIT_FAILURE);
790
455
}
791
456
/* no return */
792
457
}
801
466
perror("sigprocmask");
802
467
}
803
468
exitstatus = EXIT_FAILURE;
804
goto fallback;
469
goto end;
805
470
}
806
471
807
472
*new_process = (struct process){ .pid = pid,
815
480
if(ret < 0){
816
481
perror("sigprocmask");
817
482
exitstatus = EXIT_FAILURE;
818
goto fallback;
483
goto end;
819
484
}
820
485
821
486
FD_SET(new_process->fd, &rfds_all);
825
490
}
826
491
827
492
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
493
494
/* Free the plugin list */
495
for(plugin *next; plugin_list != NULL; plugin_list = next){
496
next = plugin_list->next;
497
free(plugin_list->argv);
498
free(plugin_list);
499
}
831
500
832
501
closedir(dir);
833
502
dir = NULL;
834
503
835
504
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
505
fprintf(stderr, "No plugin processes started, exiting\n");
506
exitstatus = EXIT_FAILURE;
507
goto end;
839
508
}
840
509
while(process_list){
841
510
fd_set rfds = rfds_all;
843
512
if (select_ret == -1){
844
513
perror("select");
845
514
exitstatus = EXIT_FAILURE;
846
goto fallback;
515
goto end;
847
516
}
848
517
/* OK, now either a process completed, or something can be read
849
518
from one of them */
856
525
/* Bad exit by plugin */
857
526
if(debug){
858
527
if(WIFEXITED(proc->status)){
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
861
WEXITSTATUS(proc->status));
528
fprintf(stderr, "Plugin %d exited with status %d\n",
529
proc->pid, WEXITSTATUS(proc->status));
862
530
} else if(WIFSIGNALED(proc->status)) {
863
fprintf(stderr, "Plugin %u killed by signal %d\n",
864
(unsigned int) (proc->pid),
865
WTERMSIG(proc->status));
531
fprintf(stderr, "Plugin %d killed by signal %d\n",
532
proc->pid, WTERMSIG(proc->status));
866
533
} else if(WCOREDUMP(proc->status)){
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
534
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
869
535
}
870
536
}
871
537
/* Remove the plugin */
872
538
FD_CLR(proc->fd, &rfds_all);
873
539
/* Block signal while modifying process_list */
874
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
540
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
875
541
if(ret < 0){
876
542
perror("sigprocmask");
877
543
exitstatus = EXIT_FAILURE;
878
goto fallback;
544
goto end;
879
545
}
880
546
/* Delete this process entry from the list */
881
547
if(process_list == proc){
904
570
break;
905
571
}
906
572
/* This process exited nicely, so print its buffer */
907
908
bool bret = print_out_password(proc->buffer,
909
proc->buffer_length);
910
if(not bret){
911
perror("print_out_password");
912
exitstatus = EXIT_FAILURE;
573
for(size_t written = 0; written < proc->buffer_length;
574
written += (size_t)ret){
575
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
576
proc->buffer + written,
577
proc->buffer_length
578
- written));
579
if(ret < 0){
580
perror("write");
581
exitstatus = EXIT_FAILURE;
582
goto end;
583
}
913
584
}
914
goto fallback;
585
goto end;
915
586
}
916
587
/* This process has not completed. Does it have any output? */
917
588
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
925
596
if (proc->buffer == NULL){
926
597
perror("malloc");
927
598
exitstatus = EXIT_FAILURE;
928
goto fallback;
599
goto end;
929
600
}
930
601
proc->buffer_size += BUFFER_SIZE;
931
602
}
944
615
}
945
616
}
946
617
}
947
948
949
fallback:
950
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
952
/* Fallback if all plugins failed, none are found or an error
953
occured */
954
bool bret;
955
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
956
char *passwordbuffer = getpass("Password: ");
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
958
if(not bret){
959
perror("print_out_password");
960
exitstatus = EXIT_FAILURE;
961
}
618
if(process_list == NULL){
619
fprintf(stderr, "All plugin processes failed, exiting\n");
620
exitstatus = EXIT_FAILURE;
962
621
}
963
622
623
end:
964
624
/* Restore old signal handler */
965
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
966
if(ret == -1){
967
perror("sigaction");
968
exitstatus = EXIT_FAILURE;
969
}
970
971
if(custom_argv != NULL){
972
for(char **arg = custom_argv+1; *arg != NULL; arg++){
973
free(*arg);
974
}
975
free(custom_argv);
976
}
977
free_plugin_list(plugin_list);
625
sigaction(SIGCHLD, &old_sigchld_action, NULL);
626
627
/* Free the plugin list */
628
for(plugin *next; plugin_list != NULL; plugin_list = next){
629
next = plugin_list->next;
630
free(plugin_list->argv);
631
free(plugin_list);
632
}
978
633
979
634
if(dir != NULL){
980
635
closedir(dir);
984
639
for(process *next; process_list != NULL; process_list = next){
985
640
next = process_list->next;
986
641
close(process_list->fd);
987
ret = kill(process_list->pid, SIGTERM);
988
if(ret == -1 and errno != ESRCH){
989
/* set-uid proccesses migth not get closed */
990
perror("kill");
991
}
642
kill(process_list->pid, SIGTERM);
992
643
free(process_list->buffer);
993
644
free(process_list);
994
645
}
1000
651
if(errno != ECHILD){
1001
652
perror("wait");
1002
653
}
1003
1004
free(plugindir);
1005
free(argfile);
1006
654
1007
655
return exitstatus;
1008
656
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0