Commit | Line | Data |
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f7433243 KT |
1 | /* |
2 | * security/tomoyo/tomoyo.c | |
3 | * | |
4 | * LSM hooks for TOMOYO Linux. | |
5 | * | |
6 | * Copyright (C) 2005-2009 NTT DATA CORPORATION | |
7 | * | |
39826a1e | 8 | * Version: 2.2.0 2009/04/01 |
f7433243 KT |
9 | * |
10 | */ | |
11 | ||
12 | #include <linux/security.h> | |
13 | #include "common.h" | |
14 | #include "tomoyo.h" | |
15 | #include "realpath.h" | |
16 | ||
ee18d64c DH |
17 | static int tomoyo_cred_alloc_blank(struct cred *new, gfp_t gfp) |
18 | { | |
19 | new->security = NULL; | |
20 | return 0; | |
21 | } | |
22 | ||
f7433243 KT |
23 | static int tomoyo_cred_prepare(struct cred *new, const struct cred *old, |
24 | gfp_t gfp) | |
25 | { | |
26 | /* | |
27 | * Since "struct tomoyo_domain_info *" is a sharable pointer, | |
28 | * we don't need to duplicate. | |
29 | */ | |
30 | new->security = old->security; | |
31 | return 0; | |
32 | } | |
33 | ||
ee18d64c DH |
34 | static void tomoyo_cred_transfer(struct cred *new, const struct cred *old) |
35 | { | |
36 | /* | |
37 | * Since "struct tomoyo_domain_info *" is a sharable pointer, | |
38 | * we don't need to duplicate. | |
39 | */ | |
40 | new->security = old->security; | |
41 | } | |
42 | ||
f7433243 KT |
43 | static int tomoyo_bprm_set_creds(struct linux_binprm *bprm) |
44 | { | |
b1338d19 HRK |
45 | int rc; |
46 | ||
47 | rc = cap_bprm_set_creds(bprm); | |
48 | if (rc) | |
49 | return rc; | |
50 | ||
f7433243 KT |
51 | /* |
52 | * Do only if this function is called for the first time of an execve | |
53 | * operation. | |
54 | */ | |
55 | if (bprm->cred_prepared) | |
56 | return 0; | |
57 | /* | |
58 | * Load policy if /sbin/tomoyo-init exists and /sbin/init is requested | |
59 | * for the first time. | |
60 | */ | |
61 | if (!tomoyo_policy_loaded) | |
62 | tomoyo_load_policy(bprm->filename); | |
63 | /* | |
64 | * Tell tomoyo_bprm_check_security() is called for the first time of an | |
65 | * execve operation. | |
66 | */ | |
67 | bprm->cred->security = NULL; | |
68 | return 0; | |
69 | } | |
70 | ||
71 | static int tomoyo_bprm_check_security(struct linux_binprm *bprm) | |
72 | { | |
73 | struct tomoyo_domain_info *domain = bprm->cred->security; | |
74 | ||
75 | /* | |
76 | * Execute permission is checked against pathname passed to do_execve() | |
77 | * using current domain. | |
78 | */ | |
56f8c9bc TH |
79 | if (!domain) |
80 | return tomoyo_find_next_domain(bprm); | |
f7433243 KT |
81 | /* |
82 | * Read permission is checked against interpreters using next domain. | |
83 | * '1' is the result of open_to_namei_flags(O_RDONLY). | |
84 | */ | |
85 | return tomoyo_check_open_permission(domain, &bprm->file->f_path, 1); | |
86 | } | |
87 | ||
f7433243 KT |
88 | static int tomoyo_path_truncate(struct path *path, loff_t length, |
89 | unsigned int time_attrs) | |
90 | { | |
91 | return tomoyo_check_1path_perm(tomoyo_domain(), | |
92 | TOMOYO_TYPE_TRUNCATE_ACL, | |
93 | path); | |
94 | } | |
95 | ||
96 | static int tomoyo_path_unlink(struct path *parent, struct dentry *dentry) | |
97 | { | |
98 | struct path path = { parent->mnt, dentry }; | |
99 | return tomoyo_check_1path_perm(tomoyo_domain(), | |
100 | TOMOYO_TYPE_UNLINK_ACL, | |
101 | &path); | |
102 | } | |
103 | ||
104 | static int tomoyo_path_mkdir(struct path *parent, struct dentry *dentry, | |
105 | int mode) | |
106 | { | |
107 | struct path path = { parent->mnt, dentry }; | |
108 | return tomoyo_check_1path_perm(tomoyo_domain(), | |
109 | TOMOYO_TYPE_MKDIR_ACL, | |
110 | &path); | |
111 | } | |
112 | ||
113 | static int tomoyo_path_rmdir(struct path *parent, struct dentry *dentry) | |
114 | { | |
115 | struct path path = { parent->mnt, dentry }; | |
116 | return tomoyo_check_1path_perm(tomoyo_domain(), | |
117 | TOMOYO_TYPE_RMDIR_ACL, | |
118 | &path); | |
119 | } | |
120 | ||
121 | static int tomoyo_path_symlink(struct path *parent, struct dentry *dentry, | |
122 | const char *old_name) | |
123 | { | |
124 | struct path path = { parent->mnt, dentry }; | |
125 | return tomoyo_check_1path_perm(tomoyo_domain(), | |
126 | TOMOYO_TYPE_SYMLINK_ACL, | |
127 | &path); | |
128 | } | |
129 | ||
130 | static int tomoyo_path_mknod(struct path *parent, struct dentry *dentry, | |
131 | int mode, unsigned int dev) | |
132 | { | |
133 | struct path path = { parent->mnt, dentry }; | |
134 | int type = TOMOYO_TYPE_CREATE_ACL; | |
135 | ||
136 | switch (mode & S_IFMT) { | |
137 | case S_IFCHR: | |
138 | type = TOMOYO_TYPE_MKCHAR_ACL; | |
139 | break; | |
140 | case S_IFBLK: | |
141 | type = TOMOYO_TYPE_MKBLOCK_ACL; | |
142 | break; | |
143 | case S_IFIFO: | |
144 | type = TOMOYO_TYPE_MKFIFO_ACL; | |
145 | break; | |
146 | case S_IFSOCK: | |
147 | type = TOMOYO_TYPE_MKSOCK_ACL; | |
148 | break; | |
149 | } | |
150 | return tomoyo_check_1path_perm(tomoyo_domain(), | |
151 | type, &path); | |
152 | } | |
153 | ||
154 | static int tomoyo_path_link(struct dentry *old_dentry, struct path *new_dir, | |
155 | struct dentry *new_dentry) | |
156 | { | |
157 | struct path path1 = { new_dir->mnt, old_dentry }; | |
158 | struct path path2 = { new_dir->mnt, new_dentry }; | |
159 | return tomoyo_check_2path_perm(tomoyo_domain(), | |
160 | TOMOYO_TYPE_LINK_ACL, | |
161 | &path1, &path2); | |
162 | } | |
163 | ||
164 | static int tomoyo_path_rename(struct path *old_parent, | |
165 | struct dentry *old_dentry, | |
166 | struct path *new_parent, | |
167 | struct dentry *new_dentry) | |
168 | { | |
169 | struct path path1 = { old_parent->mnt, old_dentry }; | |
170 | struct path path2 = { new_parent->mnt, new_dentry }; | |
171 | return tomoyo_check_2path_perm(tomoyo_domain(), | |
172 | TOMOYO_TYPE_RENAME_ACL, | |
173 | &path1, &path2); | |
174 | } | |
175 | ||
176 | static int tomoyo_file_fcntl(struct file *file, unsigned int cmd, | |
177 | unsigned long arg) | |
178 | { | |
179 | if (cmd == F_SETFL && ((arg ^ file->f_flags) & O_APPEND)) | |
180 | return tomoyo_check_rewrite_permission(tomoyo_domain(), file); | |
181 | return 0; | |
182 | } | |
183 | ||
184 | static int tomoyo_dentry_open(struct file *f, const struct cred *cred) | |
185 | { | |
186 | int flags = f->f_flags; | |
187 | ||
188 | if ((flags + 1) & O_ACCMODE) | |
189 | flags++; | |
190 | flags |= f->f_flags & (O_APPEND | O_TRUNC); | |
191 | /* Don't check read permission here if called from do_execve(). */ | |
192 | if (current->in_execve) | |
193 | return 0; | |
194 | return tomoyo_check_open_permission(tomoyo_domain(), &f->f_path, flags); | |
195 | } | |
196 | ||
c3fa109a TH |
197 | /* |
198 | * tomoyo_security_ops is a "struct security_operations" which is used for | |
199 | * registering TOMOYO. | |
200 | */ | |
f7433243 KT |
201 | static struct security_operations tomoyo_security_ops = { |
202 | .name = "tomoyo", | |
ee18d64c | 203 | .cred_alloc_blank = tomoyo_cred_alloc_blank, |
f7433243 | 204 | .cred_prepare = tomoyo_cred_prepare, |
ee18d64c | 205 | .cred_transfer = tomoyo_cred_transfer, |
f7433243 KT |
206 | .bprm_set_creds = tomoyo_bprm_set_creds, |
207 | .bprm_check_security = tomoyo_bprm_check_security, | |
f7433243 KT |
208 | .file_fcntl = tomoyo_file_fcntl, |
209 | .dentry_open = tomoyo_dentry_open, | |
210 | .path_truncate = tomoyo_path_truncate, | |
211 | .path_unlink = tomoyo_path_unlink, | |
212 | .path_mkdir = tomoyo_path_mkdir, | |
213 | .path_rmdir = tomoyo_path_rmdir, | |
214 | .path_symlink = tomoyo_path_symlink, | |
215 | .path_mknod = tomoyo_path_mknod, | |
216 | .path_link = tomoyo_path_link, | |
217 | .path_rename = tomoyo_path_rename, | |
218 | }; | |
219 | ||
220 | static int __init tomoyo_init(void) | |
221 | { | |
222 | struct cred *cred = (struct cred *) current_cred(); | |
223 | ||
224 | if (!security_module_enable(&tomoyo_security_ops)) | |
225 | return 0; | |
226 | /* register ourselves with the security framework */ | |
227 | if (register_security(&tomoyo_security_ops)) | |
228 | panic("Failure registering TOMOYO Linux"); | |
229 | printk(KERN_INFO "TOMOYO Linux initialized\n"); | |
230 | cred->security = &tomoyo_kernel_domain; | |
1581e7dd | 231 | tomoyo_realpath_init(); |
f7433243 KT |
232 | return 0; |
233 | } | |
234 | ||
235 | security_initcall(tomoyo_init); |