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- Committer: Teddy Hogeborn
- Date: 2008-09-01 16:53:17 UTC
- Revision ID: teddy@fukt.bsnet.se-20080901165317-77dccp81zyqimt2j
* plugin-runner.c (add_environment): Override existing environment
variables when asked to do so.
All callers changed.
(main): Removed old argp.args_doc string. Parse argument file
before normal command line arguments. Use ARGP_IN_ORDER
flag in both calls to argp_parse. Do not strdup() strings
to be sent to add_environment().
* plugin-runner.xml (OPTIONS): Document "--global-env" and "--envs-for".
(FILES): Note that the config file is parsed before the command line
options.
variables when asked to do so.
All callers changed.
(main): Removed old argp.args_doc string. Parse argument file
before normal command line arguments. Use ARGP_IN_ORDER
flag in both calls to argp_parse. Do not strdup() strings
to be sent to add_environment().
* plugin-runner.xml (OPTIONS): Document "--global-env" and "--envs-for".
(FILES): Note that the config file is parsed before the command line
options.
- files added:
- .bzrignore
- files removed:
- ca.pem
- files renamed:
- mandos-clients.conf => clients.conf
- server.py => mandos
- plugbasedclient.c => plugin-runner.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- plugins.d/mandosclient.c => plugins.d/password-request.c
- files modified:
- Makefile
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn and Björn Påhlsson.
5
* Copyright © 2007-2008 Teddy Hogeborn & 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 <https://www.fukt.bsnet.se/~belorn/> and
22
* <https://www.fukt.bsnet.se/~teddy/>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
22
*/
24
23
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 */
42
#include <argp.h> /* argp */
43
44
struct process;
45
46
typedef struct process{
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() */
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> /* strsep, strlen(), asprintf() */
55
#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>";
74
75
struct plugin;
76
77
typedef struct plugin{
78
char *name; /* can be NULL or any plugin name */
79
char **argv;
80
int argc;
81
char **environ;
82
int envc;
83
bool disabled;
84
85
/* Variables used for running processes*/
47
86
pid_t pid;
48
87
int fd;
49
88
char *buffer;
50
89
size_t buffer_size;
51
90
size_t buffer_length;
52
struct process *next;
53
} process;
54
55
typedef struct plugin{
56
char *name; /* can be "global" and any plugin name */
57
char **argv;
58
int argc;
91
bool eof;
92
volatile bool completed;
93
volatile int status;
59
94
struct plugin *next;
60
95
} plugin;
61
96
62
plugin *getplugin(char *name, plugin **plugin_list){
63
for (plugin *p = *plugin_list; p != NULL; p = p->next){
97
static plugin *plugin_list = NULL;
98
99
/* Gets a existing plugin based on name,
100
or if none is found, creates a new one */
101
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
64
104
if ((p->name == name)
65
105
or (p->name and name and (strcmp(p->name, name) == 0))){
66
106
return p;
69
109
/* Create a new plugin */
70
110
plugin *new_plugin = malloc(sizeof(plugin));
71
111
if (new_plugin == NULL){
72
perror("malloc");
73
exit(EXIT_FAILURE);
74
}
75
new_plugin->name = name;
112
return NULL;
113
}
114
char *copy_name = NULL;
115
if(name != NULL){
116
copy_name = strdup(name);
117
if(copy_name == NULL){
118
return NULL;
119
}
120
}
121
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
126
76
127
new_plugin->argv = malloc(sizeof(char *) * 2);
77
128
if (new_plugin->argv == NULL){
78
perror("malloc");
79
exit(EXIT_FAILURE);
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
80
132
}
81
new_plugin->argv[0] = name;
133
new_plugin->argv[0] = copy_name;
82
134
new_plugin->argv[1] = NULL;
83
new_plugin->argc = 1;
135
136
new_plugin->environ = malloc(sizeof(char *));
137
if(new_plugin->environ == NULL){
138
free(copy_name);
139
free(new_plugin->argv);
140
free(new_plugin);
141
return NULL;
142
}
143
new_plugin->environ[0] = NULL;
144
84
145
/* Append the new plugin to the list */
85
new_plugin->next = *plugin_list;
86
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
87
147
return new_plugin;
88
148
}
89
149
90
void addarguments(plugin *p, char *arg){
91
p->argv[p->argc] = arg;
92
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
93
if (p->argv == NULL){
94
perror("malloc");
95
exit(EXIT_FAILURE);
96
}
97
p->argc++;
98
p->argv[p->argc] = NULL;
99
}
100
101
#define BUFFER_SIZE 256
102
103
const char *argp_program_version =
104
"plugbasedclient 0.9";
105
const char *argp_program_bug_address =
106
"<mandos@fukt.bsnet.se>";
107
static char doc[] =
108
"Mandos plugin runner -- Run Mandos plugins";
109
/* A description of the arguments we accept. */
110
static char args_doc[] = "";
150
/* Helper function for add_argument and add_environment */
151
static bool add_to_char_array(const char *new, char ***array,
152
int *len){
153
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
156
/* Malloc check */
157
if(*array == NULL){
158
return false;
159
}
160
/* Make a copy of the new string */
161
char *copy = strdup(new);
162
if(copy == NULL){
163
return false;
164
}
165
/* Insert the copy */
166
(*array)[*len] = copy;
167
(*len)++;
168
/* Add a new terminating NULL pointer to the last element */
169
(*array)[*len] = NULL;
170
return true;
171
}
172
173
/* Add to a plugin's argument vector */
174
static bool add_argument(plugin *p, const char *arg){
175
if(p == NULL){
176
return false;
177
}
178
return add_to_char_array(arg, &(p->argv), &(p->argc));
179
}
180
181
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def, bool replace){
183
if(p == NULL){
184
return false;
185
}
186
/* namelen = length of name of environment variable */
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
191
/* It already exists */
192
if(replace){
193
char *new = realloc(*e, strlen(def));
194
if(new == NULL){
195
return false;
196
}
197
*e = new;
198
strcpy(*e, def);
199
}
200
return true;
201
}
202
}
203
return add_to_char_array(def, &(p->environ), &(p->envc));
204
}
205
206
/*
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
210
*/
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
214
/* If reading the flags failed, return error indication now. */
215
if(ret < 0){
216
return ret;
217
}
218
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
}
221
222
223
/* Mark processes as completed when they exit, and save their exit
224
status. */
225
void handle_sigchld(__attribute__((unused)) int sig){
226
while(true){
227
plugin *proc = plugin_list;
228
int status;
229
pid_t pid = waitpid(-1, &status, WNOHANG);
230
if(pid == 0){
231
/* Only still running child processes */
232
break;
233
}
234
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
237
}
238
/* No child processes */
239
break;
240
}
241
242
/* A child exited, find it in process_list */
243
while(proc != NULL and proc->pid != pid){
244
proc = proc->next;
245
}
246
if(proc == NULL){
247
/* Process not found in process list */
248
continue;
249
}
250
proc->status = status;
251
proc->completed = true;
252
}
253
}
254
255
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
257
ssize_t ret;
258
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
261
for(size_t written = 0; written < length; written += (size_t)ret){
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
263
length - written));
264
if(ret < 0){
265
return false;
266
}
267
}
268
return true;
269
}
270
271
/* Removes and free a plugin from the plugin list */
272
static void free_plugin(plugin *plugin_node){
273
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_node->argv);
278
for(char **env = plugin_node->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_node->environ);
282
free(plugin_node->buffer);
283
284
/* Removes the plugin from the singly-linked list */
285
if(plugin_node == plugin_list){
286
/* First one - simple */
287
plugin_list = plugin_list->next;
288
} else {
289
/* Second one or later */
290
for(plugin *p = plugin_list; p != NULL; p = p->next){
291
if(p->next == plugin_node){
292
p->next = plugin_node->next;
293
break;
294
}
295
}
296
}
297
298
free(plugin_node);
299
}
300
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
304
}
305
}
111
306
112
307
int main(int argc, char *argv[]){
113
char plugindir[] = "plugins.d";
114
size_t d_name_len, plugindir_len = sizeof(plugindir)-1;
115
DIR *dir;
308
char *plugindir = NULL;
309
char *argfile = NULL;
310
FILE *conffp;
311
size_t d_name_len;
312
DIR *dir = NULL;
116
313
struct dirent *dirst;
117
314
struct stat st;
118
fd_set rfds_orig;
315
fd_set rfds_all;
119
316
int ret, maxfd = 0;
120
process *process_list = NULL;
317
uid_t uid = 65534;
318
gid_t gid = 65534;
319
bool debug = false;
320
int exitstatus = EXIT_SUCCESS;
321
struct sigaction old_sigchld_action;
322
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
323
.sa_flags = SA_NOCLDSTOP };
324
char **custom_argv = NULL;
325
int custom_argc = 0;
326
327
/* Establish a signal handler */
328
sigemptyset(&sigchld_action.sa_mask);
329
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
330
if(ret == -1){
331
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
333
goto fallback;
334
}
335
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
336
if(ret == -1){
337
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
339
goto fallback;
340
}
121
341
122
342
/* The options we understand. */
123
343
struct argp_option options[] = {
124
344
{ .name = "global-options", .key = 'g',
125
.arg = "option[,option[,...]]", .flags = 0,
126
.doc = "Options effecting all plugins" },
345
.arg = "OPTION[,OPTION[,...]]",
346
.doc = "Options passed to all plugins" },
347
{ .name = "global-env", .key = 'e',
348
.arg = "VAR=value",
349
.doc = "Environment variable passed to all plugins" },
127
350
{ .name = "options-for", .key = 'o',
128
.arg = "plugin:option[,option[,...]]", .flags = 0,
129
.doc = "Options effecting only specified plugins" },
351
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
352
.doc = "Options passed only to specified plugin" },
353
{ .name = "env-for", .key = 'f',
354
.arg = "PLUGIN:ENV=value",
355
.doc = "Environment variable passed to specified plugin" },
356
{ .name = "disable", .key = 'd',
357
.arg = "PLUGIN",
358
.doc = "Disable a specific plugin", .group = 1 },
359
{ .name = "plugin-dir", .key = 128,
360
.arg = "DIRECTORY",
361
.doc = "Specify a different plugin directory", .group = 2 },
362
{ .name = "config-file", .key = 129,
363
.arg = "FILE",
364
.doc = "Specify a different configuration file", .group = 2 },
365
{ .name = "userid", .key = 130,
366
.arg = "ID", .flags = 0,
367
.doc = "User ID the plugins will run as", .group = 3 },
368
{ .name = "groupid", .key = 131,
369
.arg = "ID", .flags = 0,
370
.doc = "Group ID the plugins will run as", .group = 3 },
371
{ .name = "debug", .key = 132,
372
.doc = "Debug mode", .group = 4 },
130
373
{ .name = NULL }
131
374
};
132
375
133
error_t parse_opt (int key, char *arg, struct argp_state *state) {
134
/* Get the INPUT argument from `argp_parse', which we
135
know is a pointer to our arguments structure. */
136
plugin **plugins = state->input;
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
378
/* Get the INPUT argument from `argp_parse', which we know is a
379
pointer to our plugin list pointer. */
137
380
switch (key) {
138
case 'g':
139
if (arg != NULL){
140
char *p = strtok(arg, ",");
141
do{
142
addarguments(getplugin(NULL, plugins), p);
143
p = strtok(NULL, ",");
144
} while (p);
145
}
146
break;
147
case 'o':
148
if (arg != NULL){
149
char *name = strtok(arg, ":");
150
char *p = strtok(NULL, ":");
151
p = strtok(p, ",");
152
do{
153
addarguments(getplugin(name, plugins), p);
154
p = strtok(NULL, ",");
155
} while (p);
156
}
381
case 'g': /* --global-options */
382
if (arg != NULL){
383
char *p;
384
while((p = strsep(&arg, ",")) != NULL){
385
if(p[0] == '\0'){
386
continue;
387
}
388
if(not add_argument(getplugin(NULL), p)){
389
perror("add_argument");
390
return ARGP_ERR_UNKNOWN;
391
}
392
}
393
}
394
break;
395
case 'e': /* --global-env */
396
if(arg == NULL){
397
break;
398
}
399
{
400
char *envdef = strdup(arg);
401
if(envdef == NULL){
402
break;
403
}
404
if(not add_environment(getplugin(NULL), envdef, true)){
405
perror("add_environment");
406
}
407
}
408
break;
409
case 'o': /* --options-for */
410
if (arg != NULL){
411
char *p_name = strsep(&arg, ":");
412
if(p_name[0] == '\0'){
413
break;
414
}
415
char *opt = strsep(&arg, ":");
416
if(opt[0] == '\0'){
417
break;
418
}
419
if(opt != NULL){
420
char *p;
421
while((p = strsep(&opt, ",")) != NULL){
422
if(p[0] == '\0'){
423
continue;
424
}
425
if(not add_argument(getplugin(p_name), p)){
426
perror("add_argument");
427
return ARGP_ERR_UNKNOWN;
428
}
429
}
430
}
431
}
432
break;
433
case 'f': /* --env-for */
434
if(arg == NULL){
435
break;
436
}
437
{
438
char *envdef = strchr(arg, ':');
439
if(envdef == NULL){
440
break;
441
}
442
char *p_name = strndup(arg, (size_t) (envdef-arg));
443
if(p_name == NULL){
444
break;
445
}
446
envdef++;
447
if(not add_environment(getplugin(p_name), envdef, true)){
448
perror("add_environment");
449
}
450
}
451
break;
452
case 'd': /* --disable */
453
if (arg != NULL){
454
plugin *p = getplugin(arg);
455
if(p == NULL){
456
return ARGP_ERR_UNKNOWN;
457
}
458
p->disabled = true;
459
}
460
break;
461
case 128: /* --plugin-dir */
462
plugindir = strdup(arg);
463
if(plugindir == NULL){
464
perror("strdup");
465
}
466
break;
467
case 129: /* --config-file */
468
argfile = strdup(arg);
469
if(argfile == NULL){
470
perror("strdup");
471
}
472
break;
473
case 130: /* --userid */
474
uid = (uid_t)strtol(arg, NULL, 10);
475
break;
476
case 131: /* --groupid */
477
gid = (gid_t)strtol(arg, NULL, 10);
478
break;
479
case 132: /* --debug */
480
debug = true;
157
481
break;
158
482
case ARGP_KEY_ARG:
159
argp_usage (state);
483
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
160
484
break;
161
485
case ARGP_KEY_END:
162
486
break;
165
489
}
166
490
return 0;
167
491
}
168
169
plugin *plugin_list = NULL;
170
492
171
493
struct argp argp = { .options = options, .parser = parse_opt,
172
.args_doc = args_doc, .doc = doc };
173
174
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
175
176
/* for(plugin *p = plugin_list; p != NULL; p=p->next){ */
177
/* fprintf(stderr, "Plugin: %s has %d arguments\n", p->name ? p->name : "Global", p->argc); */
178
/* for(char **a = p->argv + 1; *a != NULL; a++){ */
179
/* fprintf(stderr, "\tArg: %s\n", *a); */
180
/* } */
181
/* } */
182
183
/* return 0; */
184
185
dir = opendir(plugindir);
494
.args_doc = "",
495
.doc = "Mandos plugin runner -- Run plugins" };
496
497
/* Open the configfile if available */
498
if (argfile == NULL){
499
conffp = fopen(AFILE, "r");
500
} else {
501
conffp = fopen(argfile, "r");
502
}
503
if(conffp != NULL){
504
char *org_line = NULL;
505
char *p, *arg, *new_arg, *line;
506
size_t size = 0;
507
ssize_t sret;
508
const char whitespace_delims[] = " \r\t\f\v\n";
509
const char comment_delim[] = "#";
510
511
custom_argc = 1;
512
custom_argv = malloc(sizeof(char*) * 2);
513
if(custom_argv == NULL){
514
perror("malloc");
515
exitstatus = EXIT_FAILURE;
516
goto fallback;
517
}
518
custom_argv[0] = argv[0];
519
custom_argv[1] = NULL;
520
521
/* for each line in the config file, strip whitespace and ignore
522
commented text */
523
while(true){
524
sret = getline(&org_line, &size, conffp);
525
if(sret == -1){
526
break;
527
}
528
529
line = org_line;
530
arg = strsep(&line, comment_delim);
531
while((p = strsep(&arg, whitespace_delims)) != NULL){
532
if(p[0] == '\0'){
533
continue;
534
}
535
new_arg = strdup(p);
536
if(new_arg == NULL){
537
perror("strdup");
538
exitstatus = EXIT_FAILURE;
539
free(org_line);
540
goto fallback;
541
}
542
543
custom_argc += 1;
544
custom_argv = realloc(custom_argv, sizeof(char *)
545
* ((unsigned int) custom_argc + 1));
546
if(custom_argv == NULL){
547
perror("realloc");
548
exitstatus = EXIT_FAILURE;
549
free(org_line);
550
goto fallback;
551
}
552
custom_argv[custom_argc-1] = new_arg;
553
custom_argv[custom_argc] = NULL;
554
}
555
}
556
free(org_line);
557
} else {
558
/* Check for harmful errors and go to fallback. Other errors might
559
not affect opening plugins */
560
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
561
perror("fopen");
562
exitstatus = EXIT_FAILURE;
563
goto fallback;
564
}
565
}
566
/* If there was any arguments from configuration file,
567
pass them to parser as command arguments */
568
if(custom_argv != NULL){
569
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
570
0, NULL);
571
if (ret == ARGP_ERR_UNKNOWN){
572
fprintf(stderr, "Unknown error while parsing arguments\n");
573
exitstatus = EXIT_FAILURE;
574
goto fallback;
575
}
576
}
577
578
/* Parse actual command line arguments, to let them override the
579
config file */
580
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
581
if (ret == ARGP_ERR_UNKNOWN){
582
fprintf(stderr, "Unknown error while parsing arguments\n");
583
exitstatus = EXIT_FAILURE;
584
goto fallback;
585
}
586
587
if(debug){
588
for(plugin *p = plugin_list; p != NULL; p=p->next){
589
fprintf(stderr, "Plugin: %s has %d arguments\n",
590
p->name ? p->name : "Global", p->argc - 1);
591
for(char **a = p->argv; *a != NULL; a++){
592
fprintf(stderr, "\tArg: %s\n", *a);
593
}
594
fprintf(stderr, "...and %u environment variables\n", p->envc);
595
for(char **a = p->environ; *a != NULL; a++){
596
fprintf(stderr, "\t%s\n", *a);
597
}
598
}
599
}
600
601
/* Strip permissions down to nobody */
602
ret = setuid(uid);
603
if (ret == -1){
604
perror("setuid");
605
}
606
setgid(gid);
607
if (ret == -1){
608
perror("setgid");
609
}
610
611
if (plugindir == NULL){
612
dir = opendir(PDIR);
613
} else {
614
dir = opendir(plugindir);
615
}
186
616
187
617
if(dir == NULL){
188
fprintf(stderr, "Can not open directory\n");
189
return EXIT_FAILURE;
190
}
191
192
FD_ZERO(&rfds_orig);
193
618
perror("Could not open plugin dir");
619
exitstatus = EXIT_FAILURE;
620
goto fallback;
621
}
622
623
/* Set the FD_CLOEXEC flag on the directory, if possible */
624
{
625
int dir_fd = dirfd(dir);
626
if(dir_fd >= 0){
627
ret = set_cloexec_flag(dir_fd);
628
if(ret < 0){
629
perror("set_cloexec_flag");
630
exitstatus = EXIT_FAILURE;
631
goto fallback;
632
}
633
}
634
}
635
636
FD_ZERO(&rfds_all);
637
638
/* Read and execute any executable in the plugin directory*/
194
639
while(true){
195
640
dirst = readdir(dir);
196
641
197
// All directory entries have been processed
642
/* All directory entries have been processed */
198
643
if(dirst == NULL){
644
if (errno == EBADF){
645
perror("readdir");
646
exitstatus = EXIT_FAILURE;
647
goto fallback;
648
}
199
649
break;
200
650
}
201
651
202
652
d_name_len = strlen(dirst->d_name);
203
653
204
// Ignore dotfiles and backup files
205
if (dirst->d_name[0] == '.'
206
or dirst->d_name[d_name_len - 1] == '~'){
207
continue;
208
}
209
210
char *filename = malloc(d_name_len + plugindir_len + 2);
211
strcpy(filename, plugindir);
212
strcat(filename, "/");
213
strcat(filename, dirst->d_name);
214
215
stat(filename, &st);
216
217
if (S_ISREG(st.st_mode) and (access(filename, X_OK) == 0)){
218
// Starting a new process to be watched
219
process *new_process = malloc(sizeof(process));
220
int pipefd[2];
221
ret = pipe(pipefd);
222
if (ret == -1){
223
perror(argv[0]);
224
goto end;
225
}
226
new_process->pid = fork();
227
if(new_process->pid == 0){
228
/* this is the child process */
654
/* Ignore dotfiles, backup files and other junk */
655
{
656
bool bad_name = false;
657
658
const char const *bad_prefixes[] = { ".", "#", NULL };
659
660
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
661
".dpkg-old",
662
".dpkg-divert", NULL };
663
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
664
size_t pre_len = strlen(*pre);
665
if((d_name_len >= pre_len)
666
and strncmp((dirst->d_name), *pre, pre_len) == 0){
667
if(debug){
668
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
669
" with bad prefix %s\n", dirst->d_name, *pre);
670
}
671
bad_name = true;
672
break;
673
}
674
}
675
if(bad_name){
676
continue;
677
}
678
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
679
size_t suf_len = strlen(*suf);
680
if((d_name_len >= suf_len)
681
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
682
== 0)){
683
if(debug){
684
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
685
" with bad suffix %s\n", dirst->d_name, *suf);
686
}
687
bad_name = true;
688
break;
689
}
690
}
691
692
if(bad_name){
693
continue;
694
}
695
}
696
697
char *filename;
698
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
699
if(ret < 0){
700
perror("asprintf");
701
continue;
702
}
703
704
ret = stat(filename, &st);
705
if (ret == -1){
706
perror("stat");
707
free(filename);
708
continue;
709
}
710
711
/* Ignore non-executable files */
712
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
713
if(debug){
714
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
715
" with bad type or mode\n", filename);
716
}
717
free(filename);
718
continue;
719
}
720
721
plugin *p = getplugin(dirst->d_name);
722
if(p == NULL){
723
perror("getplugin");
724
free(filename);
725
continue;
726
}
727
if(p->disabled){
728
if(debug){
729
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
730
dirst->d_name);
731
}
732
free(filename);
733
continue;
734
}
735
{
736
/* Add global arguments to argument list for this plugin */
737
plugin *g = getplugin(NULL);
738
if(g != NULL){
739
for(char **a = g->argv + 1; *a != NULL; a++){
740
if(not add_argument(p, *a)){
741
perror("add_argument");
742
}
743
}
744
/* Add global environment variables */
745
for(char **e = g->environ; *e != NULL; e++){
746
if(not add_environment(p, *e, false)){
747
perror("add_environment");
748
}
749
}
750
}
751
}
752
/* If this plugin has any environment variables, we will call
753
using execve and need to duplicate the environment from this
754
process, too. */
755
if(p->environ[0] != NULL){
756
for(char **e = environ; *e != NULL; e++){
757
if(not add_environment(p, *e, false)){
758
perror("add_environment");
759
}
760
}
761
}
762
763
int pipefd[2];
764
ret = pipe(pipefd);
765
if (ret == -1){
766
perror("pipe");
767
exitstatus = EXIT_FAILURE;
768
goto fallback;
769
}
770
/* Ask OS to automatic close the pipe on exec */
771
ret = set_cloexec_flag(pipefd[0]);
772
if(ret < 0){
773
perror("set_cloexec_flag");
774
exitstatus = EXIT_FAILURE;
775
goto fallback;
776
}
777
ret = set_cloexec_flag(pipefd[1]);
778
if(ret < 0){
779
perror("set_cloexec_flag");
780
exitstatus = EXIT_FAILURE;
781
goto fallback;
782
}
783
/* Block SIGCHLD until process is safely in process list */
784
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
785
if(ret < 0){
786
perror("sigprocmask");
787
exitstatus = EXIT_FAILURE;
788
goto fallback;
789
}
790
/* Starting a new process to be watched */
791
pid_t pid = fork();
792
if(pid == -1){
793
perror("fork");
794
exitstatus = EXIT_FAILURE;
795
goto fallback;
796
}
797
if(pid == 0){
798
/* this is the child process */
799
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
800
if(ret < 0){
801
perror("sigaction");
802
_exit(EXIT_FAILURE);
803
}
804
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
805
if(ret < 0){
806
perror("sigprocmask");
807
_exit(EXIT_FAILURE);
808
}
809
810
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
811
if(ret == -1){
812
perror("dup2");
813
_exit(EXIT_FAILURE);
814
}
815
816
if(dirfd(dir) < 0){
817
/* If dir has no file descriptor, we could not set FD_CLOEXEC
818
above and must now close it manually here. */
229
819
closedir(dir);
230
close(pipefd[0]); /* close unused read end of pipe */
231
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
232
char *basename;
233
basename = strrchr(filename, '/');
234
if (basename == NULL){
235
basename = filename;
236
} else {
237
basename++;
238
}
239
plugin *p = getplugin(basename, &plugin_list);
240
241
plugin *g = getplugin(NULL, &plugin_list);
242
for(char **a = g->argv + 1; *a != NULL; a++){
243
addarguments(p, *a);
244
}
820
}
821
if(p->environ[0] == NULL){
245
822
if(execv(filename, p->argv) < 0){
246
perror(argv[0]);
247
close(pipefd[1]);
248
exit(EXIT_FAILURE);
249
}
250
/* no return */
251
}
252
close(pipefd[1]); /* close unused write end of pipe */
253
new_process->fd = pipefd[0];
254
new_process->buffer = malloc(BUFFER_SIZE);
255
if (new_process->buffer == NULL){
256
perror(argv[0]);
257
goto end;
258
}
259
new_process->buffer_size = BUFFER_SIZE;
260
new_process->buffer_length = 0;
261
FD_SET(new_process->fd, &rfds_orig);
262
263
if (maxfd < new_process->fd){
264
maxfd = new_process->fd;
265
}
266
267
//List handling
268
new_process->next = process_list;
269
process_list = new_process;
270
}
823
perror("execv");
824
_exit(EXIT_FAILURE);
825
}
826
} else {
827
if(execve(filename, p->argv, p->environ) < 0){
828
perror("execve");
829
_exit(EXIT_FAILURE);
830
}
831
}
832
/* no return */
833
}
834
/* Parent process */
835
close(pipefd[1]); /* Close unused write end of pipe */
836
free(filename);
837
plugin *new_plugin = getplugin(dirst->d_name);
838
if (new_plugin == NULL){
839
perror("getplugin");
840
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
841
if(ret < 0){
842
perror("sigprocmask");
843
}
844
exitstatus = EXIT_FAILURE;
845
goto fallback;
846
}
847
848
new_plugin->pid = pid;
849
new_plugin->fd = pipefd[0];
850
851
/* Unblock SIGCHLD so signal handler can be run if this process
852
has already completed */
853
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
854
if(ret < 0){
855
perror("sigprocmask");
856
exitstatus = EXIT_FAILURE;
857
goto fallback;
858
}
859
860
FD_SET(new_plugin->fd, &rfds_all);
861
862
if (maxfd < new_plugin->fd){
863
maxfd = new_plugin->fd;
864
}
865
271
866
}
272
867
273
868
closedir(dir);
274
275
if (process_list != NULL){
276
while(true){
277
fd_set rfds = rfds_orig;
278
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
279
if (select_ret == -1){
280
perror(argv[0]);
281
goto end;
282
}else{
283
for(process *process_itr = process_list; process_itr != NULL;
284
process_itr = process_itr->next){
285
if(FD_ISSET(process_itr->fd, &rfds)){
286
if(process_itr->buffer_length + BUFFER_SIZE
287
> process_itr->buffer_size){
288
process_itr->buffer = realloc(process_itr->buffer,
289
process_itr->buffer_size
290
+ (size_t) BUFFER_SIZE);
291
if (process_itr->buffer == NULL){
292
perror(argv[0]);
293
goto end;
294
}
295
process_itr->buffer_size += BUFFER_SIZE;
296
}
297
ret = read(process_itr->fd, process_itr->buffer
298
+ process_itr->buffer_length, BUFFER_SIZE);
299
if(ret < 0){
300
/* Read error from this process; ignore it */
301
continue;
302
}
303
process_itr->buffer_length += (size_t) ret;
304
if(ret == 0){
305
/* got EOF */
306
/* wait for process exit */
307
int status;
308
waitpid(process_itr->pid, &status, 0);
309
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
310
for(size_t written = 0;
311
written < process_itr->buffer_length;){
312
ret = write(STDOUT_FILENO,
313
process_itr->buffer + written,
314
process_itr->buffer_length - written);
315
if(ret < 0){
316
perror(argv[0]);
317
goto end;
318
}
319
written += (size_t)ret;
320
}
321
goto end;
322
} else {
323
FD_CLR(process_itr->fd, &rfds_orig);
324
}
325
}
326
}
327
}
328
}
329
}
330
}
331
332
end:
333
for(process *process_itr = process_list; process_itr != NULL;
334
process_itr = process_itr->next){
335
close(process_itr->fd);
336
kill(process_itr->pid, SIGTERM);
337
free(process_itr->buffer);
338
}
339
340
while(true){
341
int status;
342
ret = wait(&status);
343
if (ret == -1){
344
if(errno != ECHILD){
345
perror("wait");
346
}
869
dir = NULL;
870
871
for(plugin *p = plugin_list; p != NULL; p = p->next){
872
if(p->pid != 0){
347
873
break;
348
874
}
349
}
350
return EXIT_SUCCESS;
875
if(p->next == NULL){
876
fprintf(stderr, "No plugin processes started. Incorrect plugin"
877
" directory?\n");
878
free_plugin_list();
879
}
880
}
881
882
/* Main loop while running plugins exist */
883
while(plugin_list){
884
fd_set rfds = rfds_all;
885
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
886
if (select_ret == -1){
887
perror("select");
888
exitstatus = EXIT_FAILURE;
889
goto fallback;
890
}
891
/* OK, now either a process completed, or something can be read
892
from one of them */
893
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
894
/* Is this process completely done? */
895
if(proc->eof and proc->completed){
896
/* Only accept the plugin output if it exited cleanly */
897
if(not WIFEXITED(proc->status)
898
or WEXITSTATUS(proc->status) != 0){
899
/* Bad exit by plugin */
900
901
if(debug){
902
if(WIFEXITED(proc->status)){
903
fprintf(stderr, "Plugin %u exited with status %d\n",
904
(unsigned int) (proc->pid),
905
WEXITSTATUS(proc->status));
906
} else if(WIFSIGNALED(proc->status)) {
907
fprintf(stderr, "Plugin %u killed by signal %d\n",
908
(unsigned int) (proc->pid),
909
WTERMSIG(proc->status));
910
} else if(WCOREDUMP(proc->status)){
911
fprintf(stderr, "Plugin %d dumped core\n",
912
(unsigned int) (proc->pid));
913
}
914
}
915
916
/* Remove the plugin */
917
FD_CLR(proc->fd, &rfds_all);
918
919
/* Block signal while modifying process_list */
920
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
921
if(ret < 0){
922
perror("sigprocmask");
923
exitstatus = EXIT_FAILURE;
924
goto fallback;
925
}
926
free_plugin(proc);
927
/* We are done modifying process list, so unblock signal */
928
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
929
NULL);
930
if(ret < 0){
931
perror("sigprocmask");
932
exitstatus = EXIT_FAILURE;
933
goto fallback;
934
}
935
936
if(plugin_list == NULL){
937
break;
938
}
939
continue;
940
}
941
942
/* This process exited nicely, so print its buffer */
943
944
bool bret = print_out_password(proc->buffer,
945
proc->buffer_length);
946
if(not bret){
947
perror("print_out_password");
948
exitstatus = EXIT_FAILURE;
949
}
950
goto fallback;
951
}
952
953
/* This process has not completed. Does it have any output? */
954
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
955
/* This process had nothing to say at this time */
956
continue;
957
}
958
/* Before reading, make the process' data buffer large enough */
959
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
960
proc->buffer = realloc(proc->buffer, proc->buffer_size
961
+ (size_t) BUFFER_SIZE);
962
if (proc->buffer == NULL){
963
perror("malloc");
964
exitstatus = EXIT_FAILURE;
965
goto fallback;
966
}
967
proc->buffer_size += BUFFER_SIZE;
968
}
969
/* Read from the process */
970
ret = read(proc->fd, proc->buffer + proc->buffer_length,
971
BUFFER_SIZE);
972
if(ret < 0){
973
/* Read error from this process; ignore the error */
974
continue;
975
}
976
if(ret == 0){
977
/* got EOF */
978
proc->eof = true;
979
} else {
980
proc->buffer_length += (size_t) ret;
981
}
982
}
983
}
984
985
986
fallback:
987
988
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
989
/* Fallback if all plugins failed, none are found or an error
990
occured */
991
bool bret;
992
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
993
char *passwordbuffer = getpass("Password: ");
994
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
995
if(not bret){
996
perror("print_out_password");
997
exitstatus = EXIT_FAILURE;
998
}
999
}
1000
1001
/* Restore old signal handler */
1002
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1003
if(ret == -1){
1004
perror("sigaction");
1005
exitstatus = EXIT_FAILURE;
1006
}
1007
1008
if(custom_argv != NULL){
1009
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1010
free(*arg);
1011
}
1012
free(custom_argv);
1013
}
1014
1015
if(dir != NULL){
1016
closedir(dir);
1017
}
1018
1019
/* Free the process list and kill the processes */
1020
for(plugin *p = plugin_list; p != NULL; p = p->next){
1021
if(p->pid != 0){
1022
close(p->fd);
1023
ret = kill(p->pid, SIGTERM);
1024
if(ret == -1 and errno != ESRCH){
1025
/* Set-uid proccesses might not get closed */
1026
perror("kill");
1027
}
1028
}
1029
}
1030
1031
/* Wait for any remaining child processes to terminate */
1032
do{
1033
ret = wait(NULL);
1034
} while(ret >= 0);
1035
if(errno != ECHILD){
1036
perror("wait");
1037
}
1038
1039
free_plugin_list();
1040
1041
free(plugindir);
1042
free(argfile);
1043
1044
return exitstatus;
351
1045
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0