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7#include <linux/security.h>
8#include "common.h"
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18static int tomoyo_cred_alloc_blank(struct cred *new, gfp_t gfp)
19{
20 new->security = NULL;
21 return 0;
22}
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32
33static int tomoyo_cred_prepare(struct cred *new, const struct cred *old,
34 gfp_t gfp)
35{
36 struct tomoyo_domain_info *domain = old->security;
37 new->security = domain;
38 if (domain)
39 atomic_inc(&domain->users);
40 return 0;
41}
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48
49static void tomoyo_cred_transfer(struct cred *new, const struct cred *old)
50{
51 tomoyo_cred_prepare(new, old, 0);
52}
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58
59static void tomoyo_cred_free(struct cred *cred)
60{
61 struct tomoyo_domain_info *domain = cred->security;
62 if (domain)
63 atomic_dec(&domain->users);
64}
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72
73static int tomoyo_bprm_set_creds(struct linux_binprm *bprm)
74{
75 int rc;
76
77 rc = cap_bprm_set_creds(bprm);
78 if (rc)
79 return rc;
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83
84
85 if (bprm->cred_prepared)
86 return 0;
87#ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
88
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91
92 if (!tomoyo_policy_loaded)
93 tomoyo_load_policy(bprm->filename);
94#endif
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100
101 atomic_dec(&((struct tomoyo_domain_info *)
102 bprm->cred->security)->users);
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107 bprm->cred->security = NULL;
108 return 0;
109}
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117
118static int tomoyo_bprm_check_security(struct linux_binprm *bprm)
119{
120 struct tomoyo_domain_info *domain = bprm->cred->security;
121
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125
126 if (!domain) {
127 const int idx = tomoyo_read_lock();
128 const int err = tomoyo_find_next_domain(bprm);
129 tomoyo_read_unlock(idx);
130 return err;
131 }
132
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134
135 return tomoyo_check_open_permission(domain, &bprm->file->f_path,
136 O_RDONLY);
137}
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147static int tomoyo_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
148{
149 struct path path = { mnt, dentry };
150 return tomoyo_path_perm(TOMOYO_TYPE_GETATTR, &path, NULL);
151}
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160static int tomoyo_path_truncate(struct path *path)
161{
162 return tomoyo_path_perm(TOMOYO_TYPE_TRUNCATE, path, NULL);
163}
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173static int tomoyo_path_unlink(struct path *parent, struct dentry *dentry)
174{
175 struct path path = { parent->mnt, dentry };
176 return tomoyo_path_perm(TOMOYO_TYPE_UNLINK, &path, NULL);
177}
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188static int tomoyo_path_mkdir(struct path *parent, struct dentry *dentry,
189 umode_t mode)
190{
191 struct path path = { parent->mnt, dentry };
192 return tomoyo_path_number_perm(TOMOYO_TYPE_MKDIR, &path,
193 mode & S_IALLUGO);
194}
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204static int tomoyo_path_rmdir(struct path *parent, struct dentry *dentry)
205{
206 struct path path = { parent->mnt, dentry };
207 return tomoyo_path_perm(TOMOYO_TYPE_RMDIR, &path, NULL);
208}
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218
219static int tomoyo_path_symlink(struct path *parent, struct dentry *dentry,
220 const char *old_name)
221{
222 struct path path = { parent->mnt, dentry };
223 return tomoyo_path_perm(TOMOYO_TYPE_SYMLINK, &path, old_name);
224}
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236static int tomoyo_path_mknod(struct path *parent, struct dentry *dentry,
237 umode_t mode, unsigned int dev)
238{
239 struct path path = { parent->mnt, dentry };
240 int type = TOMOYO_TYPE_CREATE;
241 const unsigned int perm = mode & S_IALLUGO;
242
243 switch (mode & S_IFMT) {
244 case S_IFCHR:
245 type = TOMOYO_TYPE_MKCHAR;
246 break;
247 case S_IFBLK:
248 type = TOMOYO_TYPE_MKBLOCK;
249 break;
250 default:
251 goto no_dev;
252 }
253 return tomoyo_mkdev_perm(type, &path, perm, dev);
254 no_dev:
255 switch (mode & S_IFMT) {
256 case S_IFIFO:
257 type = TOMOYO_TYPE_MKFIFO;
258 break;
259 case S_IFSOCK:
260 type = TOMOYO_TYPE_MKSOCK;
261 break;
262 }
263 return tomoyo_path_number_perm(type, &path, perm);
264}
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275static int tomoyo_path_link(struct dentry *old_dentry, struct path *new_dir,
276 struct dentry *new_dentry)
277{
278 struct path path1 = { new_dir->mnt, old_dentry };
279 struct path path2 = { new_dir->mnt, new_dentry };
280 return tomoyo_path2_perm(TOMOYO_TYPE_LINK, &path1, &path2);
281}
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293static int tomoyo_path_rename(struct path *old_parent,
294 struct dentry *old_dentry,
295 struct path *new_parent,
296 struct dentry *new_dentry)
297{
298 struct path path1 = { old_parent->mnt, old_dentry };
299 struct path path2 = { new_parent->mnt, new_dentry };
300 return tomoyo_path2_perm(TOMOYO_TYPE_RENAME, &path1, &path2);
301}
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312static int tomoyo_file_fcntl(struct file *file, unsigned int cmd,
313 unsigned long arg)
314{
315 if (!(cmd == F_SETFL && ((arg ^ file->f_flags) & O_APPEND)))
316 return 0;
317 return tomoyo_check_open_permission(tomoyo_domain(), &file->f_path,
318 O_WRONLY | (arg & O_APPEND));
319}
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329static int tomoyo_file_open(struct file *f, const struct cred *cred)
330{
331 int flags = f->f_flags;
332
333 if (current->in_execve)
334 return 0;
335 return tomoyo_check_open_permission(tomoyo_domain(), &f->f_path, flags);
336}
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347static int tomoyo_file_ioctl(struct file *file, unsigned int cmd,
348 unsigned long arg)
349{
350 return tomoyo_path_number_perm(TOMOYO_TYPE_IOCTL, &file->f_path, cmd);
351}
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361static int tomoyo_path_chmod(struct path *path, umode_t mode)
362{
363 return tomoyo_path_number_perm(TOMOYO_TYPE_CHMOD, path,
364 mode & S_IALLUGO);
365}
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376static int tomoyo_path_chown(struct path *path, kuid_t uid, kgid_t gid)
377{
378 int error = 0;
379 if (uid_valid(uid))
380 error = tomoyo_path_number_perm(TOMOYO_TYPE_CHOWN, path,
381 from_kuid(&init_user_ns, uid));
382 if (!error && gid_valid(gid))
383 error = tomoyo_path_number_perm(TOMOYO_TYPE_CHGRP, path,
384 from_kgid(&init_user_ns, gid));
385 return error;
386}
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395static int tomoyo_path_chroot(struct path *path)
396{
397 return tomoyo_path_perm(TOMOYO_TYPE_CHROOT, path, NULL);
398}
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411static int tomoyo_sb_mount(const char *dev_name, struct path *path,
412 const char *type, unsigned long flags, void *data)
413{
414 return tomoyo_mount_permission(dev_name, path, type, flags, data);
415}
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425static int tomoyo_sb_umount(struct vfsmount *mnt, int flags)
426{
427 struct path path = { mnt, mnt->mnt_root };
428 return tomoyo_path_perm(TOMOYO_TYPE_UMOUNT, &path, NULL);
429}
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439static int tomoyo_sb_pivotroot(struct path *old_path, struct path *new_path)
440{
441 return tomoyo_path2_perm(TOMOYO_TYPE_PIVOT_ROOT, new_path, old_path);
442}
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452static int tomoyo_socket_listen(struct socket *sock, int backlog)
453{
454 return tomoyo_socket_listen_permission(sock);
455}
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466static int tomoyo_socket_connect(struct socket *sock, struct sockaddr *addr,
467 int addr_len)
468{
469 return tomoyo_socket_connect_permission(sock, addr, addr_len);
470}
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481static int tomoyo_socket_bind(struct socket *sock, struct sockaddr *addr,
482 int addr_len)
483{
484 return tomoyo_socket_bind_permission(sock, addr, addr_len);
485}
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496static int tomoyo_socket_sendmsg(struct socket *sock, struct msghdr *msg,
497 int size)
498{
499 return tomoyo_socket_sendmsg_permission(sock, msg, size);
500}
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506static struct security_operations tomoyo_security_ops = {
507 .name = "tomoyo",
508 .cred_alloc_blank = tomoyo_cred_alloc_blank,
509 .cred_prepare = tomoyo_cred_prepare,
510 .cred_transfer = tomoyo_cred_transfer,
511 .cred_free = tomoyo_cred_free,
512 .bprm_set_creds = tomoyo_bprm_set_creds,
513 .bprm_check_security = tomoyo_bprm_check_security,
514 .file_fcntl = tomoyo_file_fcntl,
515 .file_open = tomoyo_file_open,
516 .path_truncate = tomoyo_path_truncate,
517 .path_unlink = tomoyo_path_unlink,
518 .path_mkdir = tomoyo_path_mkdir,
519 .path_rmdir = tomoyo_path_rmdir,
520 .path_symlink = tomoyo_path_symlink,
521 .path_mknod = tomoyo_path_mknod,
522 .path_link = tomoyo_path_link,
523 .path_rename = tomoyo_path_rename,
524 .inode_getattr = tomoyo_inode_getattr,
525 .file_ioctl = tomoyo_file_ioctl,
526 .path_chmod = tomoyo_path_chmod,
527 .path_chown = tomoyo_path_chown,
528 .path_chroot = tomoyo_path_chroot,
529 .sb_mount = tomoyo_sb_mount,
530 .sb_umount = tomoyo_sb_umount,
531 .sb_pivotroot = tomoyo_sb_pivotroot,
532 .socket_bind = tomoyo_socket_bind,
533 .socket_connect = tomoyo_socket_connect,
534 .socket_listen = tomoyo_socket_listen,
535 .socket_sendmsg = tomoyo_socket_sendmsg,
536};
537
538
539DEFINE_SRCU(tomoyo_ss);
540
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546static int __init tomoyo_init(void)
547{
548 struct cred *cred = (struct cred *) current_cred();
549
550 if (!security_module_enable(&tomoyo_security_ops))
551 return 0;
552
553 if (register_security(&tomoyo_security_ops))
554 panic("Failure registering TOMOYO Linux");
555 printk(KERN_INFO "TOMOYO Linux initialized\n");
556 cred->security = &tomoyo_kernel_domain;
557 tomoyo_mm_init();
558 return 0;
559}
560
561security_initcall(tomoyo_init);
562