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
|
#define _XOPEN_SOURCE 700
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include "sway/config.h"
#include "sway/security.h"
#include "log.h"
static bool validate_ipc_target(const char *program) {
struct stat sb;
sway_log(L_DEBUG, "Validating IPC target '%s'", program);
if (!strcmp(program, "*")) {
return true;
}
if (lstat(program, &sb) == -1) {
return false;
}
if (!S_ISREG(sb.st_mode)) {
sway_log(L_ERROR,
"IPC target '%s' MUST be/point at an existing regular file",
program);
return false;
}
if (sb.st_uid != 0) {
#ifdef NDEBUG
sway_log(L_ERROR, "IPC target '%s' MUST be owned by root", program);
return false;
#else
sway_log(L_INFO, "IPC target '%s' MUST be owned by root (waived for debug build)", program);
return true;
#endif
}
if (sb.st_mode & S_IWOTH) {
sway_log(L_ERROR, "IPC target '%s' MUST NOT be world writable", program);
return false;
}
return true;
}
struct feature_policy *alloc_feature_policy(const char *program) {
uint32_t default_policy = 0;
if (!validate_ipc_target(program)) {
return NULL;
}
for (int i = 0; i < config->feature_policies->length; ++i) {
struct feature_policy *policy = config->feature_policies->items[i];
if (strcmp(policy->program, "*") == 0) {
default_policy = policy->features;
break;
}
}
struct feature_policy *policy = malloc(sizeof(struct feature_policy));
if (!policy) {
return NULL;
}
policy->program = strdup(program);
if (!policy->program) {
free(policy);
return NULL;
}
policy->features = default_policy;
return policy;
}
struct ipc_policy *alloc_ipc_policy(const char *program) {
uint32_t default_policy = 0;
if (!validate_ipc_target(program)) {
return NULL;
}
for (int i = 0; i < config->ipc_policies->length; ++i) {
struct ipc_policy *policy = config->ipc_policies->items[i];
if (strcmp(policy->program, "*") == 0) {
default_policy = policy->features;
break;
}
}
struct ipc_policy *policy = malloc(sizeof(struct ipc_policy));
if (!policy) {
return NULL;
}
policy->program = strdup(program);
if (!policy->program) {
free(policy);
return NULL;
}
policy->features = default_policy;
return policy;
}
struct command_policy *alloc_command_policy(const char *command) {
struct command_policy *policy = malloc(sizeof(struct command_policy));
if (!policy) {
return NULL;
}
policy->command = strdup(command);
if (!policy->command) {
free(policy);
return NULL;
}
policy->context = 0;
return policy;
}
static const char *get_pid_exe(pid_t pid) {
#ifdef __FreeBSD__
const char *fmt = "/proc/%d/file";
#else
const char *fmt = "/proc/%d/exe";
#endif
int pathlen = snprintf(NULL, 0, fmt, pid);
char *path = malloc(pathlen + 1);
if (path) {
snprintf(path, pathlen + 1, fmt, pid);
}
static char link[2048];
ssize_t len = !path ? -1 : readlink(path, link, sizeof(link));
if (len < 0) {
sway_log(L_INFO,
"WARNING: unable to read %s for security check. Using default policy.",
path);
strcpy(link, "*");
} else {
link[len] = '\0';
}
free(path);
return link;
}
struct feature_policy *get_feature_policy(const char *name) {
struct feature_policy *policy = NULL;
for (int i = 0; i < config->feature_policies->length; ++i) {
struct feature_policy *p = config->feature_policies->items[i];
if (strcmp(p->program, name) == 0) {
policy = p;
break;
}
}
if (!policy) {
policy = alloc_feature_policy(name);
sway_assert(policy, "Unable to allocate security policy");
if (policy) {
list_add(config->feature_policies, policy);
}
}
return policy;
}
uint32_t get_feature_policy_mask(pid_t pid) {
uint32_t default_policy = 0;
const char *link = get_pid_exe(pid);
for (int i = 0; i < config->feature_policies->length; ++i) {
struct feature_policy *policy = config->feature_policies->items[i];
if (strcmp(policy->program, "*") == 0) {
default_policy = policy->features;
}
if (strcmp(policy->program, link) == 0) {
return policy->features;
}
}
return default_policy;
}
uint32_t get_ipc_policy_mask(pid_t pid) {
uint32_t default_policy = 0;
const char *link = get_pid_exe(pid);
for (int i = 0; i < config->ipc_policies->length; ++i) {
struct ipc_policy *policy = config->ipc_policies->items[i];
if (strcmp(policy->program, "*") == 0) {
default_policy = policy->features;
}
if (strcmp(policy->program, link) == 0) {
return policy->features;
}
}
return default_policy;
}
uint32_t get_command_policy_mask(const char *cmd) {
uint32_t default_policy = 0;
for (int i = 0; i < config->command_policies->length; ++i) {
struct command_policy *policy = config->command_policies->items[i];
if (strcmp(policy->command, "*") == 0) {
default_policy = policy->context;
}
if (strcmp(policy->command, cmd) == 0) {
return policy->context;
}
}
return default_policy;
}
const char *command_policy_str(enum command_context context) {
switch (context) {
case CONTEXT_ALL:
return "all";
case CONTEXT_CONFIG:
return "config";
case CONTEXT_BINDING:
return "binding";
case CONTEXT_IPC:
return "IPC";
case CONTEXT_CRITERIA:
return "criteria";
default:
return "unknown";
}
}
|
