1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
|
#include <stdio.h>
#include <inttypes.h>
#include <string.h>
#include <regex.h>
#include <unistd.h>
#include <fcntl.h>
#include "config.h"
#include "cred_dict.h"
#include "util_rt.h"
#include "llist.h"
static regex_t re_entry, re_comment, re_empty;
static void print_help (FILE *o, const char *prog) {
fprintf(
o,
"Usage: %s <cred file> <out file>\n"
"Options:\n"
"\t<cred file>: path to file listing credentials. \"-\" to read stdin\n"
"\t<out file>: path to output file. \"-\" for stdout\n"
"Cred File Format: <WEIGHT> <ID> [PW]\n"
"\t<WEIGHT>: uint8_t weight value\n"
"\t<ID>: c_str username\n"
"\t[PW]: c_str password (optional)\n"
"\tNote:\n"
"\t\t- <ID> and <PW> are case-sensitive\n"
"\t\t- Lines start with \"#\" are ignored\n"
"Cred File Example:\n"
"\t# TP-Link\n"
"\t16\tadmin\tadmin\n"
"\t# Linux machine with empty root password\n"
"\t128\troot\n"
"\t# Another typical default cred\n"
"\t32\troot\t1234\n",
prog);
}
static int do_parse (
FILE *file,
prne_cred_dict_raw_entry_t **arr,
size_t *cnt)
{
static const size_t RM_SIZE = 8;
regmatch_t rm[RM_SIZE];
char line[2][1024];
size_t nr_line = 0;
char *ent_weight, *ent_id, *ent_pw;
size_t sl_id, sl_pw;
prne_cred_dict_raw_entry_t ent;
while (true) {
if (fgets(line[0], sizeof(line[0]), file) == NULL) {
break;
}
nr_line += 1;
if (regexec(&re_empty, line[0], RM_SIZE, rm, 0) == 0 ||
regexec(&re_comment, line[0], RM_SIZE, rm, 0) == 0)
{
continue;
}
if (regexec(&re_entry, line[0], RM_SIZE, rm, 0) != 0) {
goto INV_LINE;
}
strcpy(line[1], line[0]);
prne_memzero(&ent, sizeof(prne_cred_dict_raw_entry_t));
line[1][rm[2].rm_eo] = 0; // terminate WEIGHT
line[1][rm[3].rm_eo] = 0; // terminate ID
ent_weight = line[1] + rm[2].rm_so;
ent_id = line[1] + rm[3].rm_so;
sl_id = rm[3].rm_eo - rm[3].rm_so;
if (rm[5].rm_so >= 0) { // PW
line[1][rm[5].rm_eo] = 0;
ent_pw = line[1] + rm[5].rm_so;
sl_pw = rm[5].rm_eo - rm[5].rm_so;
}
else {
ent_pw = "";
sl_pw = 0;
}
if (sscanf(ent_weight, "%"SCNu8, &ent.weight) != 1) {
goto INV_LINE;
}
ent.id = prne_alloc_str(sl_id);
ent.pw = prne_alloc_str(sl_pw);
prne_assert(ent.id != NULL && ent.pw != NULL);
memcpy(ent.id, ent_id, sl_id + 1);
memcpy(ent.pw, ent_pw, sl_pw + 1);
*arr = prne_realloc(*arr, sizeof(prne_cred_dict_raw_entry_t), *cnt + 1);
prne_assert(*arr != NULL);
(*arr)[*cnt] = ent;
*cnt += 1;
}
return 0;
INV_LINE:
fprintf(
stderr,
"*** Invalid entry at line %zu: %s\n",
nr_line,
line[0]);
return 2;
}
int main (const int argc, const char **args) {
int ret = 0;
prne_cred_dict_t dict;
prne_cred_dict_raw_entry_t *arr = NULL;
uint8_t *m = NULL;
size_t m_len = 0;
size_t cnt = 0;
FILE *in_f = NULL;
bool own_in_f = false;
int out_fd = -1;
prne_assert(regcomp(
&re_entry,
// ^(\s+)?([0-9]{1,3})\s+(\S+)(\s+(\S+))?(\s+)?(#.*)?$
// number of captures: 7
// significant groups: <2>, <3>, [5]
"^(\\s+)?([0-9]{1,3})\\s+(\\S+)(\\s+(\\S+))?(\\s+)?(#.*)?$",
REG_EXTENDED | REG_ICASE) == 0);
prne_assert(regcomp(
&re_comment,
// ^(\s+)?#.*$
"^(\\s+)?#.*$",
REG_EXTENDED | REG_ICASE) == 0);
prne_assert(regcomp(
&re_empty,
// ^(\s+)?$
"^(\\s+)?$",
REG_EXTENDED | REG_ICASE) == 0);
prne_init_cred_dict(&dict);
// TRY
// parse args
if (argc < 3) {
print_help(stderr, args[0]);
ret = 2;
goto END;
}
if (prne_nstreq(args[1], "-")) {
in_f = stdin;
}
else {
own_in_f = true;
in_f = fopen(args[1], "r");
if (in_f == NULL) {
perror(args[1]);
ret = 1;
goto END;
}
}
if (prne_nstreq(args[2], "-")) {
out_fd = STDOUT_FILENO;
}
else {
out_fd = open(args[2], O_WRONLY | O_CREAT | O_TRUNC, 0644);
if (out_fd < 0) {
perror(args[2]);
ret = 1;
goto END;
}
}
if (isatty(out_fd)) {
fprintf(stderr, "Refusing to write on terminal.\n");
ret = 1;
goto END;
}
ret = do_parse(in_f, &arr, &cnt);
if (ret != 0) {
goto END;
}
if (!prne_build_cred_dict(arr, cnt, &m, &m_len)) {
ret = 1;
perror("prne_build_cred_dict()");
goto END;
}
// test
if (!prne_dser_cred_dict(&dict, m, m_len)) {
ret = 1;
perror("prne_dser_cred_dict()");
goto END;
}
if (PRNE_DEBUG && PRNE_VERBOSE >= PRNE_VL_DBG0) {
for (size_t i = 0; i < dict.cnt; i += 1) {
fprintf(
stderr,
"%"PRIu8"\t%s\t%s\n",
dict.arr[i].weight,
dict.m + dict.arr[i].id,
dict.m + dict.arr[i].pw);
}
}
if (write(out_fd, m, m_len) != (ssize_t)m_len) {
ret = 1;
perror("write()");
goto END;
}
END:
// clean up
prne_close(out_fd);
if (own_in_f && in_f != NULL) {
fclose(in_f);
}
regfree(&re_entry);
regfree(&re_comment);
regfree(&re_empty);
prne_free_cred_dict(&dict);
for (size_t i = 0; i < cnt; i += 1) {
prne_free(arr[i].id);
prne_free(arr[i].pw);
}
prne_free(arr);
prne_free(m);
return ret;
}
|
