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- Committer: Teddy Hogeborn
- Date: 2009-01-15 02:52:02 UTC
- Revision ID: teddy@fukt.bsnet.se-20090115025202-utyjssfivzumvw7m
* debian/watch: New file.
* debian/mandos-client.README.Debian (Emergency Escape): New section;
document the
"mandos=off"
kernel
parameter.
* initramfs-tools-script: Exit if kernel has parameter "mandos=off".
* debian/mandos-client.README.Debian (Emergency Escape): New section;
document the
"mandos=off"
kernel
parameter.
* initramfs-tools-script: Exit if kernel has parameter "mandos=off".
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- 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 & Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
21
22
* Contact the authors at <mandos@fukt.bsnet.se>.
22
23
*/
23
24
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
26
27
#include <stddef.h> /* size_t, NULL */
27
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
29
EXIT_SUCCESS, realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
32
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
46
47
fcntl(), setuid(), setgid(),
47
48
F_GETFD, F_SETFD, FD_CLOEXEC,
48
49
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
dup2(), STDOUT_FILENO, _exit(),
50
51
execv(), write(), read(),
51
52
close() */
52
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
54
FD_CLOEXEC */
54
#include <string.h> /* strtok, strlen(), strcpy(),
55
strcat() */
55
#include <string.h> /* strsep, strlen(), asprintf() */
56
56
#include <errno.h> /* errno */
57
57
#include <argp.h> /* struct argp_option, struct
58
58
argp_state, struct argp,
59
59
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
61
62
#include <signal.h> /* struct sigaction, sigemptyset(),
62
63
sigaddset(), sigaction(),
63
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
65
SIG_UNBLOCK, kill() */
65
66
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
66
68
67
69
#define BUFFER_SIZE 256
68
70
69
const char *argp_program_version = "mandos-client 1.0";
71
#define PDIR "/lib/mandos/plugins.d"
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
74
const char *argp_program_version = "plugin-runner " VERSION;
70
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
76
72
struct process;
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;
73
84
74
typedef struct process{
85
/* Variables used for running processes*/
75
86
pid_t pid;
76
87
int fd;
77
88
char *buffer;
78
89
size_t buffer_size;
79
90
size_t buffer_length;
80
91
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
86
typedef struct plugin{
87
char *name; /* can be NULL or any plugin name */
88
char **argv;
89
int argc;
90
bool disabled;
92
volatile bool completed;
93
volatile int status;
91
94
struct plugin *next;
92
95
} plugin;
93
96
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
96
if ((p->name == name)
97
or (p->name and name and (strcmp(p->name, name) == 0))){
97
static plugin *plugin_list = NULL;
98
99
/* Gets an 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){
104
if((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
98
106
return p;
99
107
}
100
108
}
101
109
/* Create a new plugin */
102
110
plugin *new_plugin = malloc(sizeof(plugin));
103
if (new_plugin == NULL){
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
111
if(new_plugin == NULL){
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
108
127
new_plugin->argv = malloc(sizeof(char *) * 2);
109
if (new_plugin->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
128
if(new_plugin->argv == NULL){
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
112
132
}
113
new_plugin->argv[0] = name;
133
new_plugin->argv[0] = copy_name;
114
134
new_plugin->argv[1] = NULL;
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
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
118
145
/* Append the new plugin to the list */
119
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
120
147
return new_plugin;
121
148
}
122
149
123
static void addargument(plugin *p, char *arg){
124
p->argv[p->argc] = arg;
125
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
126
if (p->argv == NULL){
127
perror("malloc");
128
exit(EXIT_FAILURE);
129
}
130
p->argc++;
131
p->argv[p->argc] = NULL;
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) + 1);
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));
132
204
}
133
205
134
206
/*
136
208
* Descriptor Flags".
137
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
138
210
*/
139
static int set_cloexec_flag(int fd)
140
{
211
static int set_cloexec_flag(int fd){
141
212
int ret = fcntl(fd, F_GETFD, 0);
142
213
/* If reading the flags failed, return error indication now. */
143
214
if(ret < 0){
147
218
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
148
219
}
149
220
150
process *process_list = NULL;
151
221
152
/* Mark a process as completed when it exits, and save its exit
222
/* Mark processes as completed when they exit, and save their exit
153
223
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;
224
static void handle_sigchld(__attribute__((unused)) int sig){
225
while(true){
226
plugin *proc = plugin_list;
227
int status;
228
pid_t pid = waitpid(-1, &status, WNOHANG);
229
if(pid == 0){
230
/* Only still running child processes */
231
break;
232
}
233
if(pid == -1){
234
if(errno != ECHILD){
235
perror("waitpid");
236
}
237
/* No child processes */
238
break;
239
}
240
241
/* A child exited, find it in process_list */
242
while(proc != NULL and proc->pid != pid){
243
proc = proc->next;
244
}
245
if(proc == NULL){
246
/* Process not found in process list */
247
continue;
248
}
249
proc->status = status;
250
proc->completed = true;
251
}
252
}
253
254
/* Prints out a password to stdout */
255
static bool print_out_password(const char *buffer, size_t length){
256
ssize_t ret;
257
for(size_t written = 0; written < length; written += (size_t)ret){
258
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
259
length - written));
260
if(ret < 0){
261
return false;
262
}
263
}
264
return true;
265
}
266
267
/* Removes and free a plugin from the plugin list */
268
static void free_plugin(plugin *plugin_node){
269
270
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
271
free(*arg);
272
}
273
free(plugin_node->argv);
274
for(char **env = plugin_node->environ; *env != NULL; env++){
275
free(*env);
276
}
277
free(plugin_node->environ);
278
free(plugin_node->buffer);
279
280
/* Removes the plugin from the singly-linked list */
281
if(plugin_node == plugin_list){
282
/* First one - simple */
283
plugin_list = plugin_list->next;
284
} else {
285
/* Second one or later */
286
for(plugin *p = plugin_list; p != NULL; p = p->next){
287
if(p->next == plugin_node){
288
p->next = plugin_node->next;
289
break;
290
}
291
}
292
}
293
294
free(plugin_node);
295
}
296
297
static void free_plugin_list(void){
298
while(plugin_list != NULL){
299
free_plugin(plugin_list);
300
}
171
301
}
172
302
173
303
int main(int argc, char *argv[]){
174
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
304
char *plugindir = NULL;
305
char *argfile = NULL;
306
FILE *conffp;
175
307
size_t d_name_len;
176
308
DIR *dir = NULL;
177
309
struct dirent *dirst;
178
310
struct stat st;
179
311
fd_set rfds_all;
180
int ret, maxfd = 0;
312
int ret, numchars, maxfd = 0;
313
ssize_t sret;
314
intmax_t tmpmax;
181
315
uid_t uid = 65534;
182
316
gid_t gid = 65534;
183
317
bool debug = false;
185
319
struct sigaction old_sigchld_action;
186
320
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
187
321
.sa_flags = SA_NOCLDSTOP };
188
char *plus_options = NULL;
189
char **plus_argv = NULL;
322
char **custom_argv = NULL;
323
int custom_argc = 0;
190
324
191
325
/* Establish a signal handler */
192
326
sigemptyset(&sigchld_action.sa_mask);
193
327
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
194
if(ret < 0){
328
if(ret == -1){
195
329
perror("sigaddset");
196
exit(EXIT_FAILURE);
330
exitstatus = EXIT_FAILURE;
331
goto fallback;
197
332
}
198
333
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
199
if(ret < 0){
334
if(ret == -1){
200
335
perror("sigaction");
201
exit(EXIT_FAILURE);
336
exitstatus = EXIT_FAILURE;
337
goto fallback;
202
338
}
203
339
204
340
/* The options we understand. */
206
342
{ .name = "global-options", .key = 'g',
207
343
.arg = "OPTION[,OPTION[,...]]",
208
344
.doc = "Options passed to all plugins" },
345
{ .name = "global-env", .key = 'G',
346
.arg = "VAR=value",
347
.doc = "Environment variable passed to all plugins" },
209
348
{ .name = "options-for", .key = 'o',
210
349
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
211
350
.doc = "Options passed only to specified plugin" },
351
{ .name = "env-for", .key = 'E',
352
.arg = "PLUGIN:ENV=value",
353
.doc = "Environment variable passed to specified plugin" },
212
354
{ .name = "disable", .key = 'd',
213
355
.arg = "PLUGIN",
214
356
.doc = "Disable a specific plugin", .group = 1 },
357
{ .name = "enable", .key = 'e',
358
.arg = "PLUGIN",
359
.doc = "Enable a specific plugin", .group = 1 },
215
360
{ .name = "plugin-dir", .key = 128,
216
361
.arg = "DIRECTORY",
217
362
.doc = "Specify a different plugin directory", .group = 2 },
218
{ .name = "userid", .key = 129,
219
.arg = "ID", .flags = 0,
220
.doc = "User ID the plugins will run as", .group = 2 },
221
{ .name = "groupid", .key = 130,
222
.arg = "ID", .flags = 0,
223
.doc = "Group ID the plugins will run as", .group = 2 },
224
{ .name = "debug", .key = 131,
225
.doc = "Debug mode", .group = 3 },
363
{ .name = "config-file", .key = 129,
364
.arg = "FILE",
365
.doc = "Specify a different configuration file", .group = 2 },
366
{ .name = "userid", .key = 130,
367
.arg = "ID", .flags = 0,
368
.doc = "User ID the plugins will run as", .group = 3 },
369
{ .name = "groupid", .key = 131,
370
.arg = "ID", .flags = 0,
371
.doc = "Group ID the plugins will run as", .group = 3 },
372
{ .name = "debug", .key = 132,
373
.doc = "Debug mode", .group = 4 },
226
374
{ .name = NULL }
227
375
};
228
376
229
error_t parse_opt (int key, char *arg, struct argp_state *state) {
230
/* Get the INPUT argument from `argp_parse', which we know is a
231
pointer to our plugin list pointer. */
232
plugin **plugins = state->input;
233
switch (key) {
234
case 'g':
235
if (arg != NULL){
236
char *p = strtok(arg, ",");
237
do{
238
addargument(getplugin(NULL, plugins), p);
239
p = strtok(NULL, ",");
240
} while (p != NULL);
241
}
242
break;
243
case 'o':
244
if (arg != NULL){
245
char *name = strtok(arg, ":");
246
char *p = strtok(NULL, ":");
247
if(p != NULL){
248
p = strtok(p, ",");
249
do{
250
addargument(getplugin(name, plugins), p);
251
p = strtok(NULL, ",");
252
} while (p != NULL);
253
}
254
}
255
break;
256
case 'd':
257
if (arg != NULL){
258
getplugin(arg, plugins)->disabled = true;
259
}
260
break;
261
case 128:
262
plugindir = arg;
263
break;
264
case 129:
265
uid = (uid_t)strtol(arg, NULL, 10);
266
break;
267
case 130:
268
gid = (gid_t)strtol(arg, NULL, 10);
269
break;
270
case 131:
377
error_t parse_opt(int key, char *arg, __attribute__((unused))
378
struct argp_state *state) {
379
switch(key) {
380
case 'g': /* --global-options */
381
if(arg != NULL){
382
char *p;
383
while((p = strsep(&arg, ",")) != NULL){
384
if(p[0] == '\0'){
385
continue;
386
}
387
if(not add_argument(getplugin(NULL), p)){
388
perror("add_argument");
389
return ARGP_ERR_UNKNOWN;
390
}
391
}
392
}
393
break;
394
case 'G': /* --global-env */
395
if(arg == NULL){
396
break;
397
}
398
if(not add_environment(getplugin(NULL), arg, true)){
399
perror("add_environment");
400
}
401
break;
402
case 'o': /* --options-for */
403
if(arg != NULL){
404
char *p_name = strsep(&arg, ":");
405
if(p_name[0] == '\0' or arg == NULL){
406
break;
407
}
408
char *opt = strsep(&arg, ":");
409
if(opt[0] == '\0' or opt == NULL){
410
break;
411
}
412
char *p;
413
while((p = strsep(&opt, ",")) != NULL){
414
if(p[0] == '\0'){
415
continue;
416
}
417
if(not add_argument(getplugin(p_name), p)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
420
}
421
}
422
}
423
break;
424
case 'E': /* --env-for */
425
if(arg == NULL){
426
break;
427
}
428
{
429
char *envdef = strchr(arg, ':');
430
if(envdef == NULL){
431
break;
432
}
433
*envdef = '\0';
434
if(not add_environment(getplugin(arg), envdef+1, true)){
435
perror("add_environment");
436
}
437
}
438
break;
439
case 'd': /* --disable */
440
if(arg != NULL){
441
plugin *p = getplugin(arg);
442
if(p == NULL){
443
return ARGP_ERR_UNKNOWN;
444
}
445
p->disabled = true;
446
}
447
break;
448
case 'e': /* --enable */
449
if(arg != NULL){
450
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
453
}
454
p->disabled = false;
455
}
456
break;
457
case 128: /* --plugin-dir */
458
free(plugindir);
459
plugindir = strdup(arg);
460
if(plugindir == NULL){
461
perror("strdup");
462
}
463
break;
464
case 129: /* --config-file */
465
/* This is already done by parse_opt_config_file() */
466
break;
467
case 130: /* --userid */
468
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
469
if(ret < 1 or tmpmax != (uid_t)tmpmax
470
or arg[numchars] != '\0'){
471
fprintf(stderr, "Bad user ID number: \"%s\", using %"
472
PRIdMAX "\n", arg, (intmax_t)uid);
473
} else {
474
uid = (uid_t)tmpmax;
475
}
476
break;
477
case 131: /* --groupid */
478
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
479
if(ret < 1 or tmpmax != (gid_t)tmpmax
480
or arg[numchars] != '\0'){
481
fprintf(stderr, "Bad group ID number: \"%s\", using %"
482
PRIdMAX "\n", arg, (intmax_t)gid);
483
} else {
484
gid = (gid_t)tmpmax;
485
}
486
break;
487
case 132: /* --debug */
271
488
debug = true;
272
489
break;
273
case ARGP_KEY_ARG:
274
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
275
argp_usage (state);
276
}
277
plus_options = arg;
278
break;
279
case ARGP_KEY_END:
280
break;
281
default:
282
return ARGP_ERR_UNKNOWN;
283
}
284
return 0;
285
}
286
287
plugin *plugin_list = NULL;
288
289
struct argp argp = { .options = options, .parser = parse_opt,
290
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
490
/*
491
* When adding more options before this line, remember to also add a
492
* "case" to the "parse_opt_config_file" function below.
493
*/
494
case ARGP_KEY_ARG:
495
/* Cryptsetup always passes an argument, which is an empty
496
string if "none" was specified in /etc/crypttab. So if
497
argument was empty, we ignore it silently. */
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
500
}
501
break;
502
case ARGP_KEY_END:
503
break;
504
default:
505
return ARGP_ERR_UNKNOWN;
506
}
507
return 0;
508
}
509
510
/* This option parser is the same as parse_opt() above, except it
511
ignores everything but the --config-file option. */
512
error_t parse_opt_config_file(int key, char *arg,
513
__attribute__((unused))
514
struct argp_state *state) {
515
switch(key) {
516
case 'g': /* --global-options */
517
case 'G': /* --global-env */
518
case 'o': /* --options-for */
519
case 'E': /* --env-for */
520
case 'd': /* --disable */
521
case 'e': /* --enable */
522
case 128: /* --plugin-dir */
523
break;
524
case 129: /* --config-file */
525
free(argfile);
526
argfile = strdup(arg);
527
if(argfile == NULL){
528
perror("strdup");
529
}
530
break;
531
case 130: /* --userid */
532
case 131: /* --groupid */
533
case 132: /* --debug */
534
case ARGP_KEY_ARG:
535
case ARGP_KEY_END:
536
break;
537
default:
538
return ARGP_ERR_UNKNOWN;
539
}
540
return 0;
541
}
542
543
struct argp argp = { .options = options,
544
.parser = parse_opt_config_file,
545
.args_doc = "",
291
546
.doc = "Mandos plugin runner -- Run plugins" };
292
547
293
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
294
if (ret == ARGP_ERR_UNKNOWN){
295
fprintf(stderr, "Unkown error while parsing arguments\n");
548
/* Parse using parse_opt_config_file() in order to get the custom
549
config file location, if any. */
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
552
fprintf(stderr, "Unknown error while parsing arguments\n");
296
553
exitstatus = EXIT_FAILURE;
297
goto end;
554
goto fallback;
298
555
}
299
556
300
if(plus_options){
301
/* This is a mangled argument in the form of
302
"+--option+--other-option=parameter+--yet-another-option", etc */
303
/* Make new argc and argv vars, and call argp_parse() again. */
304
plus_options++; /* skip the first '+' character */
305
const char delims[] = "+";
306
char *arg;
307
int new_argc = 1;
308
plus_argv = malloc(sizeof(char*) * 2);
309
if(plus_argv == NULL){
557
/* Reset to the normal argument parser */
558
argp.parser = parse_opt;
559
560
/* Open the configfile if available */
561
if(argfile == NULL){
562
conffp = fopen(AFILE, "r");
563
} else {
564
conffp = fopen(argfile, "r");
565
}
566
if(conffp != NULL){
567
char *org_line = NULL;
568
char *p, *arg, *new_arg, *line;
569
size_t size = 0;
570
const char whitespace_delims[] = " \r\t\f\v\n";
571
const char comment_delim[] = "#";
572
573
custom_argc = 1;
574
custom_argv = malloc(sizeof(char*) * 2);
575
if(custom_argv == NULL){
310
576
perror("malloc");
311
577
exitstatus = EXIT_FAILURE;
312
goto end;
313
}
314
plus_argv[0] = argv[0];
315
plus_argv[1] = NULL;
316
arg = strtok(plus_options, delims); /* Get first argument */
317
while(arg != NULL){
318
new_argc++;
319
plus_argv = realloc(plus_argv, sizeof(char *)
320
* ((unsigned int) new_argc + 1));
321
if(plus_argv == NULL){
322
perror("realloc");
323
exitstatus = EXIT_FAILURE;
324
goto end;
325
}
326
plus_argv[new_argc-1] = arg;
327
plus_argv[new_argc] = NULL;
328
arg = strtok(NULL, delims); /* Get next argument */
329
}
330
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
331
if (ret == ARGP_ERR_UNKNOWN){
332
fprintf(stderr, "Unkown error while parsing arguments\n");
333
exitstatus = EXIT_FAILURE;
334
goto end;
335
}
578
goto fallback;
579
}
580
custom_argv[0] = argv[0];
581
custom_argv[1] = NULL;
582
583
/* for each line in the config file, strip whitespace and ignore
584
commented text */
585
while(true){
586
sret = getline(&org_line, &size, conffp);
587
if(sret == -1){
588
break;
589
}
590
591
line = org_line;
592
arg = strsep(&line, comment_delim);
593
while((p = strsep(&arg, whitespace_delims)) != NULL){
594
if(p[0] == '\0'){
595
continue;
596
}
597
new_arg = strdup(p);
598
if(new_arg == NULL){
599
perror("strdup");
600
exitstatus = EXIT_FAILURE;
601
free(org_line);
602
goto fallback;
603
}
604
605
custom_argc += 1;
606
custom_argv = realloc(custom_argv, sizeof(char *)
607
* ((unsigned int) custom_argc + 1));
608
if(custom_argv == NULL){
609
perror("realloc");
610
exitstatus = EXIT_FAILURE;
611
free(org_line);
612
goto fallback;
613
}
614
custom_argv[custom_argc-1] = new_arg;
615
custom_argv[custom_argc] = NULL;
616
}
617
}
618
free(org_line);
619
} else {
620
/* Check for harmful errors and go to fallback. Other errors might
621
not affect opening plugins */
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
623
perror("fopen");
624
exitstatus = EXIT_FAILURE;
625
goto fallback;
626
}
627
}
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
630
if(custom_argv != NULL){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
exitstatus = EXIT_FAILURE;
636
goto fallback;
637
}
638
}
639
640
/* Parse actual command line arguments, to let them override the
641
config file */
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
exitstatus = EXIT_FAILURE;
646
goto fallback;
336
647
}
337
648
338
649
if(debug){
342
653
for(char **a = p->argv; *a != NULL; a++){
343
654
fprintf(stderr, "\tArg: %s\n", *a);
344
655
}
656
fprintf(stderr, "...and %d environment variables\n", p->envc);
657
for(char **a = p->environ; *a != NULL; a++){
658
fprintf(stderr, "\t%s\n", *a);
659
}
345
660
}
346
661
}
347
662
663
/* Strip permissions down to nobody */
348
664
ret = setuid(uid);
349
if (ret == -1){
665
if(ret == -1){
350
666
perror("setuid");
351
}
352
667
}
353
668
setgid(gid);
354
if (ret == -1){
669
if(ret == -1){
355
670
perror("setgid");
356
671
}
357
672
358
dir = opendir(plugindir);
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
677
}
678
359
679
if(dir == NULL){
360
680
perror("Could not open plugin dir");
361
681
exitstatus = EXIT_FAILURE;
362
goto end;
682
goto fallback;
363
683
}
364
684
365
685
/* Set the FD_CLOEXEC flag on the directory, if possible */
370
690
if(ret < 0){
371
691
perror("set_cloexec_flag");
372
692
exitstatus = EXIT_FAILURE;
373
goto end;
693
goto fallback;
374
694
}
375
695
}
376
696
}
377
697
378
698
FD_ZERO(&rfds_all);
379
699
700
/* Read and execute any executable in the plugin directory*/
380
701
while(true){
381
702
dirst = readdir(dir);
382
703
383
// All directory entries have been processed
704
/* All directory entries have been processed */
384
705
if(dirst == NULL){
385
if (errno == EBADF){
706
if(errno == EBADF){
386
707
perror("readdir");
387
708
exitstatus = EXIT_FAILURE;
388
goto end;
709
goto fallback;
389
710
}
390
711
break;
391
712
}
392
713
393
714
d_name_len = strlen(dirst->d_name);
394
715
395
// Ignore dotfiles, backup files and other junk
716
/* Ignore dotfiles, backup files and other junk */
396
717
{
397
718
bool bad_name = false;
398
719
400
721
401
722
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
402
723
".dpkg-old",
724
".dpkg-bak",
403
725
".dpkg-divert", NULL };
404
726
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
405
727
size_t pre_len = strlen(*pre);
413
735
break;
414
736
}
415
737
}
416
417
738
if(bad_name){
418
739
continue;
419
740
}
420
421
741
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
422
742
size_t suf_len = strlen(*suf);
423
743
if((d_name_len >= suf_len)
436
756
continue;
437
757
}
438
758
}
439
440
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
441
if (filename == NULL){
442
perror("malloc");
443
exitstatus = EXIT_FAILURE;
444
goto end;
445
}
446
strcpy(filename, plugindir); /* Spurious warning */
447
strcat(filename, "/"); /* Spurious warning */
448
strcat(filename, dirst->d_name); /* Spurious warning */
759
760
char *filename;
761
if(plugindir == NULL){
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
763
} else {
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
765
}
766
if(ret < 0){
767
perror("asprintf");
768
continue;
769
}
449
770
450
771
ret = stat(filename, &st);
451
if (ret == -1){
772
if(ret == -1){
452
773
perror("stat");
453
exitstatus = EXIT_FAILURE;
454
goto end;
774
free(filename);
775
continue;
455
776
}
456
457
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
777
778
/* Ignore non-executable files */
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
458
780
if(debug){
459
781
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
460
782
" with bad type or mode\n", filename);
462
784
free(filename);
463
785
continue;
464
786
}
465
if(getplugin(dirst->d_name, &plugin_list)->disabled){
787
788
plugin *p = getplugin(dirst->d_name);
789
if(p == NULL){
790
perror("getplugin");
791
free(filename);
792
continue;
793
}
794
if(p->disabled){
466
795
if(debug){
467
796
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
468
797
dirst->d_name);
470
799
free(filename);
471
800
continue;
472
801
}
473
plugin *p = getplugin(dirst->d_name, &plugin_list);
474
802
{
475
803
/* Add global arguments to argument list for this plugin */
476
plugin *g = getplugin(NULL, &plugin_list);
477
for(char **a = g->argv + 1; *a != NULL; a++){
478
addargument(p, *a);
479
}
480
}
481
int pipefd[2];
804
plugin *g = getplugin(NULL);
805
if(g != NULL){
806
for(char **a = g->argv + 1; *a != NULL; a++){
807
if(not add_argument(p, *a)){
808
perror("add_argument");
809
}
810
}
811
/* Add global environment variables */
812
for(char **e = g->environ; *e != NULL; e++){
813
if(not add_environment(p, *e, false)){
814
perror("add_environment");
815
}
816
}
817
}
818
}
819
/* If this plugin has any environment variables, we will call
820
using execve and need to duplicate the environment from this
821
process, too. */
822
if(p->environ[0] != NULL){
823
for(char **e = environ; *e != NULL; e++){
824
if(not add_environment(p, *e, false)){
825
perror("add_environment");
826
}
827
}
828
}
829
830
int pipefd[2];
482
831
ret = pipe(pipefd);
483
if (ret == -1){
832
if(ret == -1){
484
833
perror("pipe");
485
834
exitstatus = EXIT_FAILURE;
486
goto end;
835
goto fallback;
487
836
}
837
/* Ask OS to automatic close the pipe on exec */
488
838
ret = set_cloexec_flag(pipefd[0]);
489
839
if(ret < 0){
490
840
perror("set_cloexec_flag");
491
841
exitstatus = EXIT_FAILURE;
492
goto end;
842
goto fallback;
493
843
}
494
844
ret = set_cloexec_flag(pipefd[1]);
495
845
if(ret < 0){
496
846
perror("set_cloexec_flag");
497
847
exitstatus = EXIT_FAILURE;
498
goto end;
848
goto fallback;
499
849
}
500
850
/* Block SIGCHLD until process is safely in process list */
501
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
502
852
if(ret < 0){
503
853
perror("sigprocmask");
504
854
exitstatus = EXIT_FAILURE;
505
goto end;
855
goto fallback;
506
856
}
507
// Starting a new process to be watched
857
/* Starting a new process to be watched */
508
858
pid_t pid = fork();
859
if(pid == -1){
860
perror("fork");
861
exitstatus = EXIT_FAILURE;
862
goto fallback;
863
}
509
864
if(pid == 0){
510
865
/* this is the child process */
511
866
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
513
868
perror("sigaction");
514
869
_exit(EXIT_FAILURE);
515
870
}
516
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
517
872
if(ret < 0){
518
873
perror("sigprocmask");
519
874
_exit(EXIT_FAILURE);
520
875
}
521
876
522
877
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
523
878
if(ret == -1){
524
879
perror("dup2");
530
885
above and must now close it manually here. */
531
886
closedir(dir);
532
887
}
533
if(execv(filename, p->argv) < 0){
534
perror("execv");
535
_exit(EXIT_FAILURE);
888
if(p->environ[0] == NULL){
889
if(execv(filename, p->argv) < 0){
890
perror("execv");
891
_exit(EXIT_FAILURE);
892
}
893
} else {
894
if(execve(filename, p->argv, p->environ) < 0){
895
perror("execve");
896
_exit(EXIT_FAILURE);
897
}
536
898
}
537
899
/* no return */
538
900
}
539
/* parent process */
901
/* Parent process */
902
close(pipefd[1]); /* Close unused write end of pipe */
540
903
free(filename);
541
close(pipefd[1]); /* close unused write end of pipe */
542
process *new_process = malloc(sizeof(process));
543
if (new_process == NULL){
544
perror("malloc");
545
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
904
plugin *new_plugin = getplugin(dirst->d_name);
905
if(new_plugin == NULL){
906
perror("getplugin");
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
546
908
if(ret < 0){
547
perror("sigprocmask");
909
perror("sigprocmask");
548
910
}
549
911
exitstatus = EXIT_FAILURE;
550
goto end;
912
goto fallback;
551
913
}
552
914
553
*new_process = (struct process){ .pid = pid,
554
.fd = pipefd[0],
555
.next = process_list };
556
// List handling
557
process_list = new_process;
915
new_plugin->pid = pid;
916
new_plugin->fd = pipefd[0];
917
558
918
/* Unblock SIGCHLD so signal handler can be run if this process
559
919
has already completed */
560
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
561
921
if(ret < 0){
562
922
perror("sigprocmask");
563
923
exitstatus = EXIT_FAILURE;
564
goto end;
565
}
566
567
FD_SET(new_process->fd, &rfds_all);
568
569
if (maxfd < new_process->fd){
570
maxfd = new_process->fd;
571
}
572
573
}
574
575
/* Free the plugin list */
576
for(plugin *next; plugin_list != NULL; plugin_list = next){
577
next = plugin_list->next;
578
free(plugin_list->argv);
579
free(plugin_list);
924
goto fallback;
925
}
926
927
FD_SET(new_plugin->fd, &rfds_all);
928
929
if(maxfd < new_plugin->fd){
930
maxfd = new_plugin->fd;
931
}
580
932
}
581
933
582
934
closedir(dir);
583
935
dir = NULL;
584
585
if (process_list == NULL){
586
fprintf(stderr, "No plugin processes started, exiting\n");
587
exitstatus = EXIT_FAILURE;
588
goto end;
936
937
for(plugin *p = plugin_list; p != NULL; p = p->next){
938
if(p->pid != 0){
939
break;
940
}
941
if(p->next == NULL){
942
fprintf(stderr, "No plugin processes started. Incorrect plugin"
943
" directory?\n");
944
free_plugin_list();
945
}
589
946
}
590
while(process_list){
947
948
/* Main loop while running plugins exist */
949
while(plugin_list){
591
950
fd_set rfds = rfds_all;
592
951
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
593
if (select_ret == -1){
952
if(select_ret == -1){
594
953
perror("select");
595
954
exitstatus = EXIT_FAILURE;
596
goto end;
955
goto fallback;
597
956
}
598
957
/* OK, now either a process completed, or something can be read
599
958
from one of them */
600
for(process *proc = process_list; proc ; proc = proc->next){
959
for(plugin *proc = plugin_list; proc != NULL;){
601
960
/* Is this process completely done? */
602
961
if(proc->eof and proc->completed){
603
962
/* Only accept the plugin output if it exited cleanly */
604
963
if(not WIFEXITED(proc->status)
605
964
or WEXITSTATUS(proc->status) != 0){
606
965
/* Bad exit by plugin */
966
607
967
if(debug){
608
968
if(WIFEXITED(proc->status)){
609
fprintf(stderr, "Plugin %d exited with status %d\n",
610
proc->pid, WEXITSTATUS(proc->status));
969
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
970
" %d\n", (intmax_t) (proc->pid),
971
WEXITSTATUS(proc->status));
611
972
} else if(WIFSIGNALED(proc->status)) {
612
fprintf(stderr, "Plugin %d killed by signal %d\n",
613
proc->pid, WTERMSIG(proc->status));
973
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
974
" %d\n", (intmax_t) (proc->pid),
975
WTERMSIG(proc->status));
614
976
} else if(WCOREDUMP(proc->status)){
615
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
977
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
978
(intmax_t) (proc->pid));
616
979
}
617
980
}
981
618
982
/* Remove the plugin */
619
983
FD_CLR(proc->fd, &rfds_all);
984
620
985
/* Block signal while modifying process_list */
621
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
622
987
if(ret < 0){
623
988
perror("sigprocmask");
624
989
exitstatus = EXIT_FAILURE;
625
goto end;
626
}
627
/* Delete this process entry from the list */
628
if(process_list == proc){
629
/* First one - simple */
630
process_list = proc->next;
631
} else {
632
/* Second one or later */
633
for(process *p = process_list; p != NULL; p = p->next){
634
if(p->next == proc){
635
p->next = proc->next;
636
break;
637
}
638
}
639
}
990
goto fallback;
991
}
992
993
plugin *next_plugin = proc->next;
994
free_plugin(proc);
995
proc = next_plugin;
996
640
997
/* We are done modifying process list, so unblock signal */
641
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
642
NULL);
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
643
1000
if(ret < 0){
644
1001
perror("sigprocmask");
645
}
646
free(proc->buffer);
647
free(proc);
648
/* We deleted this process from the list, so we can't go
649
proc->next. Therefore, start over from the beginning of
650
the process list */
651
break;
1002
exitstatus = EXIT_FAILURE;
1003
goto fallback;
1004
}
1005
1006
if(plugin_list == NULL){
1007
break;
1008
}
1009
1010
continue;
652
1011
}
1012
653
1013
/* This process exited nicely, so print its buffer */
654
for(size_t written = 0; written < proc->buffer_length;
655
written += (size_t)ret){
656
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
657
proc->buffer + written,
658
proc->buffer_length
659
- written));
660
if(ret < 0){
661
perror("write");
662
exitstatus = EXIT_FAILURE;
663
goto end;
664
}
1014
1015
bool bret = print_out_password(proc->buffer,
1016
proc->buffer_length);
1017
if(not bret){
1018
perror("print_out_password");
1019
exitstatus = EXIT_FAILURE;
665
1020
}
666
goto end;
1021
goto fallback;
667
1022
}
1023
668
1024
/* This process has not completed. Does it have any output? */
669
1025
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
670
1026
/* This process had nothing to say at this time */
1027
proc = proc->next;
671
1028
continue;
672
1029
}
673
1030
/* Before reading, make the process' data buffer large enough */
674
1031
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
675
1032
proc->buffer = realloc(proc->buffer, proc->buffer_size
676
1033
+ (size_t) BUFFER_SIZE);
677
if (proc->buffer == NULL){
1034
if(proc->buffer == NULL){
678
1035
perror("malloc");
679
1036
exitstatus = EXIT_FAILURE;
680
goto end;
1037
goto fallback;
681
1038
}
682
1039
proc->buffer_size += BUFFER_SIZE;
683
1040
}
684
1041
/* Read from the process */
685
ret = read(proc->fd, proc->buffer + proc->buffer_length,
686
BUFFER_SIZE);
687
if(ret < 0){
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1044
if(sret < 0){
688
1045
/* Read error from this process; ignore the error */
1046
proc = proc->next;
689
1047
continue;
690
1048
}
691
if(ret == 0){
1049
if(sret == 0){
692
1050
/* got EOF */
693
1051
proc->eof = true;
694
1052
} else {
695
proc->buffer_length += (size_t) ret;
1053
proc->buffer_length += (size_t) sret;
696
1054
}
697
1055
}
698
1056
}
699
if(process_list == NULL){
700
fprintf(stderr, "All plugin processes failed, exiting\n");
701
exitstatus = EXIT_FAILURE;
1057
1058
1059
fallback:
1060
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1062
/* Fallback if all plugins failed, none are found or an error
1063
occured */
1064
bool bret;
1065
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1066
char *passwordbuffer = getpass("Password: ");
1067
size_t len = strlen(passwordbuffer);
1068
/* Strip trailing newline */
1069
if(len > 0 and passwordbuffer[len-1] == '\n'){
1070
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1071
len--;
1072
}
1073
bret = print_out_password(passwordbuffer, len);
1074
if(not bret){
1075
perror("print_out_password");
1076
exitstatus = EXIT_FAILURE;
1077
}
702
1078
}
703
1079
704
end:
705
1080
/* Restore old signal handler */
706
sigaction(SIGCHLD, &old_sigchld_action, NULL);
707
708
free(plus_argv);
709
710
/* Free the plugin list */
711
for(plugin *next; plugin_list != NULL; plugin_list = next){
712
next = plugin_list->next;
713
free(plugin_list->argv);
714
free(plugin_list);
1081
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1082
if(ret == -1){
1083
perror("sigaction");
1084
exitstatus = EXIT_FAILURE;
1085
}
1086
1087
if(custom_argv != NULL){
1088
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1089
free(*arg);
1090
}
1091
free(custom_argv);
715
1092
}
716
1093
717
1094
if(dir != NULL){
718
1095
closedir(dir);
719
1096
}
720
1097
721
/* Free the process list and kill the processes */
722
for(process *next; process_list != NULL; process_list = next){
723
next = process_list->next;
724
close(process_list->fd);
725
ret = kill(process_list->pid, SIGTERM);
726
if(ret == -1 and errno != ESRCH){
727
/* set-uid proccesses migth not get closed */
728
perror("kill");
1098
/* Kill the processes */
1099
for(plugin *p = plugin_list; p != NULL; p = p->next){
1100
if(p->pid != 0){
1101
close(p->fd);
1102
ret = kill(p->pid, SIGTERM);
1103
if(ret == -1 and errno != ESRCH){
1104
/* Set-uid proccesses might not get closed */
1105
perror("kill");
1106
}
729
1107
}
730
free(process_list->buffer);
731
free(process_list);
732
1108
}
733
1109
734
1110
/* Wait for any remaining child processes to terminate */
739
1115
perror("wait");
740
1116
}
741
1117
1118
free_plugin_list();
1119
1120
free(plugindir);
1121
free(argfile);
1122
742
1123
return exitstatus;
743
1124
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0