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1da177e4 LT |
1 | #ifndef __LINUX_NET_SCM_H |
2 | #define __LINUX_NET_SCM_H | |
3 | ||
4 | #include <linux/limits.h> | |
5 | #include <linux/net.h> | |
dc49c1f9 | 6 | #include <linux/security.h> |
b488893a PE |
7 | #include <linux/pid.h> |
8 | #include <linux/nsproxy.h> | |
1da177e4 LT |
9 | |
10 | /* Well, we should have at least one descriptor open | |
11 | * to accept passed FDs 8) | |
12 | */ | |
bba14de9 | 13 | #define SCM_MAX_FD 253 |
1da177e4 | 14 | |
dbe9a417 EB |
15 | struct scm_creds { |
16 | u32 pid; | |
17 | kuid_t uid; | |
18 | kgid_t gid; | |
19 | }; | |
20 | ||
fd2c3ef7 | 21 | struct scm_fp_list { |
bba14de9 ED |
22 | short count; |
23 | short max; | |
f8d570a4 | 24 | struct file *fp[SCM_MAX_FD]; |
1da177e4 LT |
25 | }; |
26 | ||
fd2c3ef7 | 27 | struct scm_cookie { |
257b5358 EB |
28 | struct pid *pid; /* Skb credentials */ |
29 | const struct cred *cred; | |
1da177e4 | 30 | struct scm_fp_list *fp; /* Passed files */ |
dbe9a417 | 31 | struct scm_creds creds; /* Skb credentials */ |
877ce7c1 | 32 | #ifdef CONFIG_SECURITY_NETWORK |
dc49c1f9 | 33 | u32 secid; /* Passed security ID */ |
877ce7c1 | 34 | #endif |
1da177e4 LT |
35 | }; |
36 | ||
37 | extern void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm); | |
38 | extern void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm); | |
39 | extern int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm); | |
40 | extern void __scm_destroy(struct scm_cookie *scm); | |
41 | extern struct scm_fp_list * scm_fp_dup(struct scm_fp_list *fpl); | |
42 | ||
dc49c1f9 CZ |
43 | #ifdef CONFIG_SECURITY_NETWORK |
44 | static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm) | |
45 | { | |
46 | security_socket_getpeersec_dgram(sock, NULL, &scm->secid); | |
47 | } | |
48 | #else | |
49 | static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm) | |
50 | { } | |
51 | #endif /* CONFIG_SECURITY_NETWORK */ | |
52 | ||
257b5358 EB |
53 | static __inline__ void scm_set_cred(struct scm_cookie *scm, |
54 | struct pid *pid, const struct cred *cred) | |
55 | { | |
56 | scm->pid = get_pid(pid); | |
16e57262 | 57 | scm->cred = cred ? get_cred(cred) : NULL; |
dbe9a417 | 58 | scm->creds.pid = pid_vnr(pid); |
83f1b4ba LT |
59 | scm->creds.uid = cred ? cred->uid : INVALID_UID; |
60 | scm->creds.gid = cred ? cred->gid : INVALID_GID; | |
257b5358 EB |
61 | } |
62 | ||
63 | static __inline__ void scm_destroy_cred(struct scm_cookie *scm) | |
64 | { | |
65 | put_pid(scm->pid); | |
66 | scm->pid = NULL; | |
67 | ||
68 | if (scm->cred) | |
69 | put_cred(scm->cred); | |
70 | scm->cred = NULL; | |
71 | } | |
72 | ||
1da177e4 LT |
73 | static __inline__ void scm_destroy(struct scm_cookie *scm) |
74 | { | |
257b5358 | 75 | scm_destroy_cred(scm); |
2a6c8c79 | 76 | if (scm->fp) |
1da177e4 LT |
77 | __scm_destroy(scm); |
78 | } | |
79 | ||
80 | static __inline__ int scm_send(struct socket *sock, struct msghdr *msg, | |
e0e3cea4 | 81 | struct scm_cookie *scm, bool forcecreds) |
1da177e4 | 82 | { |
16e57262 | 83 | memset(scm, 0, sizeof(*scm)); |
e0e3cea4 ED |
84 | if (forcecreds) |
85 | scm_set_cred(scm, task_tgid(current), current_cred()); | |
dc49c1f9 | 86 | unix_get_peersec_dgram(sock, scm); |
1da177e4 LT |
87 | if (msg->msg_controllen <= 0) |
88 | return 0; | |
89 | return __scm_send(sock, msg, scm); | |
90 | } | |
91 | ||
877ce7c1 CZ |
92 | #ifdef CONFIG_SECURITY_NETWORK |
93 | static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm) | |
94 | { | |
dc49c1f9 CZ |
95 | char *secdata; |
96 | u32 seclen; | |
97 | int err; | |
98 | ||
99 | if (test_bit(SOCK_PASSSEC, &sock->flags)) { | |
100 | err = security_secid_to_secctx(scm->secid, &secdata, &seclen); | |
101 | ||
102 | if (!err) { | |
103 | put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata); | |
104 | security_release_secctx(secdata, seclen); | |
105 | } | |
106 | } | |
877ce7c1 CZ |
107 | } |
108 | #else | |
109 | static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm) | |
110 | { } | |
111 | #endif /* CONFIG_SECURITY_NETWORK */ | |
112 | ||
1da177e4 LT |
113 | static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg, |
114 | struct scm_cookie *scm, int flags) | |
115 | { | |
fd2c3ef7 | 116 | if (!msg->msg_control) { |
1da177e4 LT |
117 | if (test_bit(SOCK_PASSCRED, &sock->flags) || scm->fp) |
118 | msg->msg_flags |= MSG_CTRUNC; | |
f78a5fda | 119 | scm_destroy(scm); |
1da177e4 LT |
120 | return; |
121 | } | |
122 | ||
dbe9a417 EB |
123 | if (test_bit(SOCK_PASSCRED, &sock->flags)) { |
124 | struct user_namespace *current_ns = current_user_ns(); | |
125 | struct ucred ucreds = { | |
126 | .pid = scm->creds.pid, | |
127 | .uid = from_kuid_munged(current_ns, scm->creds.uid), | |
128 | .gid = from_kgid_munged(current_ns, scm->creds.gid), | |
129 | }; | |
130 | put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(ucreds), &ucreds); | |
131 | } | |
1da177e4 | 132 | |
f78a5fda DM |
133 | scm_destroy_cred(scm); |
134 | ||
877ce7c1 CZ |
135 | scm_passec(sock, msg, scm); |
136 | ||
1da177e4 LT |
137 | if (!scm->fp) |
138 | return; | |
139 | ||
140 | scm_detach_fds(msg, scm); | |
141 | } | |
142 | ||
143 | ||
144 | #endif /* __LINUX_NET_SCM_H */ | |
145 |