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
|
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <errno.h>
#include <selinux/selinux.h>
#include <selinux/label.h>
static __attribute__ ((__noreturn__)) void usage(const char *progname)
{
fprintf(stderr,
"usage: %s -b backend [-v] [-B] [-i] [-f file]\n\n"
"Where:\n\t"
"-b The backend - \"file\", \"media\", \"x\", \"db\" or "
"\"prop\"\n\t"
"-v Run \"cat <specfile_list> | openssl dgst -sha1 -hex\"\n\t"
" on the list of specfiles to compare the SHA1 digests.\n\t"
"-B Use base specfiles only (valid for \"-b file\" only).\n\t"
"-i Do not request a digest.\n\t"
"-f Optional file containing the specs (defaults to\n\t"
" those used by loaded policy).\n\n",
progname);
exit(1);
}
static int run_check_digest(const char *cmd, const char *selabel_digest, size_t digest_len)
{
FILE *fp;
char files_digest[128];
const char *files_ptr;
int rc = 0;
fp = popen(cmd, "r");
if (!fp) {
fprintf(stderr, "Failed to run command '%s': %s\n", cmd, strerror(errno));
return -1;
}
/* Only expect one line "(stdin)= x.." so read and find first space */
while (fgets(files_digest, sizeof(files_digest) - 1, fp) != NULL)
;
files_ptr = strstr(files_digest, " ");
rc = strncmp(selabel_digest, files_ptr + 1, digest_len * 2);
if (rc) {
printf("Failed validation:\n\tselabel_digest: %s\n\t"
"files_digest: %s\n",
selabel_digest, files_ptr + 1);
} else {
printf("Passed validation - digest: %s\n", selabel_digest);
}
pclose(fp);
return rc;
}
int main(int argc, char **argv)
{
unsigned int backend = SELABEL_CTX_FILE;
int rc, opt, validate = 0;
char *baseonly = NULL, *file = NULL, *digest = (char *)1;
char **specfiles = NULL;
unsigned char *sha1_digest = NULL;
size_t digest_len, i, num_specfiles;
char cmd_buf[4096];
char *cmd_ptr;
char *sha1_buf = NULL;
struct selabel_handle *hnd;
struct selinux_opt selabel_option[] = {
{ SELABEL_OPT_PATH, file },
{ SELABEL_OPT_DIGEST, digest },
{ SELABEL_OPT_BASEONLY, baseonly }
};
if (argc < 3)
usage(argv[0]);
while ((opt = getopt(argc, argv, "ib:Bvf:")) > 0) {
switch (opt) {
case 'b':
if (!strcasecmp(optarg, "file")) {
backend = SELABEL_CTX_FILE;
} else if (!strcmp(optarg, "media")) {
backend = SELABEL_CTX_MEDIA;
} else if (!strcmp(optarg, "x")) {
backend = SELABEL_CTX_X;
} else if (!strcmp(optarg, "db")) {
backend = SELABEL_CTX_DB;
} else if (!strcmp(optarg, "prop")) {
backend = SELABEL_CTX_ANDROID_PROP;
} else if (!strcmp(optarg, "service")) {
backend = SELABEL_CTX_ANDROID_SERVICE;
} else {
fprintf(stderr, "Unknown backend: %s\n",
optarg);
usage(argv[0]);
}
break;
case 'B':
baseonly = (char *)1;
break;
case 'v':
validate = 1;
break;
case 'i':
digest = NULL;
break;
case 'f':
file = optarg;
break;
default:
usage(argv[0]);
}
}
memset(cmd_buf, 0, sizeof(cmd_buf));
selabel_option[0].value = file;
selabel_option[1].value = digest;
selabel_option[2].value = baseonly;
hnd = selabel_open(backend, selabel_option, backend == SELABEL_CTX_FILE ? 3 : 2);
if (!hnd) {
switch (errno) {
case EOVERFLOW:
fprintf(stderr, "ERROR Number of specfiles or specfile"
" buffer caused an overflow.\n");
break;
default:
fprintf(stderr, "ERROR: selabel_open: %s\n",
strerror(errno));
}
return -1;
}
rc = selabel_digest(hnd, &sha1_digest, &digest_len, &specfiles,
&num_specfiles);
if (rc) {
switch (errno) {
case EINVAL:
fprintf(stderr, "No digest available.\n");
break;
default:
fprintf(stderr, "selabel_digest ERROR: %s\n",
strerror(errno));
}
goto err;
}
sha1_buf = malloc(digest_len * 2 + 1);
if (!sha1_buf) {
fprintf(stderr, "Could not malloc buffer ERROR: %s\n",
strerror(errno));
rc = -1;
goto err;
}
printf("SHA1 digest: ");
for (i = 0; i < digest_len; i++)
sprintf(&(sha1_buf[i * 2]), "%02x", sha1_digest[i]);
printf("%s\n", sha1_buf);
printf("calculated using the following specfile(s):\n");
if (specfiles) {
size_t cmd_rem = sizeof(cmd_buf);
int ret;
if (validate) {
cmd_ptr = &cmd_buf[0];
ret = snprintf(cmd_ptr, cmd_rem, "/usr/bin/cat ");
if (ret < 0 || (size_t)ret >= cmd_rem) {
fprintf(stderr, "Could not format validate command\n");
rc = -1;
goto err;
}
cmd_ptr += ret;
cmd_rem -= ret;
}
for (i = 0; i < num_specfiles; i++) {
if (validate) {
ret = snprintf(cmd_ptr, cmd_rem, "%s ", specfiles[i]);
if (ret < 0 || (size_t)ret >= cmd_rem) {
fprintf(stderr, "Could not format validate command\n");
rc = -1;
goto err;
}
cmd_ptr += ret;
cmd_rem -= ret;
}
printf("%s\n", specfiles[i]);
}
if (validate) {
ret = snprintf(cmd_ptr, cmd_rem, "| /usr/bin/openssl dgst -sha1 -hex");
if (ret < 0 || (size_t)ret >= cmd_rem) {
fprintf(stderr, "Could not format validate command\n");
rc = -1;
goto err;
}
rc = run_check_digest(cmd_buf, sha1_buf, digest_len);
}
}
err:
free(sha1_buf);
selabel_close(hnd);
return rc;
}
|
