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Commit | Line | Data |
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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; | |
415e3d3e | 24 | struct user_struct *user; |
f8d570a4 | 25 | struct file *fp[SCM_MAX_FD]; |
1da177e4 LT |
26 | }; |
27 | ||
fd2c3ef7 | 28 | struct scm_cookie { |
257b5358 | 29 | struct pid *pid; /* Skb credentials */ |
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 | ||
8153ff5c JP |
37 | void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm); |
38 | void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm); | |
39 | int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm); | |
40 | void __scm_destroy(struct scm_cookie *scm); | |
41 | struct scm_fp_list *scm_fp_dup(struct scm_fp_list *fpl); | |
1da177e4 | 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 | 53 | static __inline__ void scm_set_cred(struct scm_cookie *scm, |
6b0ee8c0 | 54 | struct pid *pid, kuid_t uid, kgid_t gid) |
257b5358 EB |
55 | { |
56 | scm->pid = get_pid(pid); | |
dbe9a417 | 57 | scm->creds.pid = pid_vnr(pid); |
6b0ee8c0 EB |
58 | scm->creds.uid = uid; |
59 | scm->creds.gid = gid; | |
257b5358 EB |
60 | } |
61 | ||
62 | static __inline__ void scm_destroy_cred(struct scm_cookie *scm) | |
63 | { | |
64 | put_pid(scm->pid); | |
65 | scm->pid = NULL; | |
257b5358 EB |
66 | } |
67 | ||
1da177e4 LT |
68 | static __inline__ void scm_destroy(struct scm_cookie *scm) |
69 | { | |
257b5358 | 70 | scm_destroy_cred(scm); |
2a6c8c79 | 71 | if (scm->fp) |
1da177e4 LT |
72 | __scm_destroy(scm); |
73 | } | |
74 | ||
75 | static __inline__ int scm_send(struct socket *sock, struct msghdr *msg, | |
e0e3cea4 | 76 | struct scm_cookie *scm, bool forcecreds) |
1da177e4 | 77 | { |
16e57262 | 78 | memset(scm, 0, sizeof(*scm)); |
6b0ee8c0 EB |
79 | scm->creds.uid = INVALID_UID; |
80 | scm->creds.gid = INVALID_GID; | |
e0e3cea4 | 81 | if (forcecreds) |
6e0895c2 | 82 | scm_set_cred(scm, task_tgid(current), current_uid(), current_gid()); |
dc49c1f9 | 83 | unix_get_peersec_dgram(sock, scm); |
1da177e4 LT |
84 | if (msg->msg_controllen <= 0) |
85 | return 0; | |
86 | return __scm_send(sock, msg, scm); | |
87 | } | |
88 | ||
877ce7c1 CZ |
89 | #ifdef CONFIG_SECURITY_NETWORK |
90 | static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm) | |
91 | { | |
dc49c1f9 CZ |
92 | char *secdata; |
93 | u32 seclen; | |
94 | int err; | |
95 | ||
96 | if (test_bit(SOCK_PASSSEC, &sock->flags)) { | |
97 | err = security_secid_to_secctx(scm->secid, &secdata, &seclen); | |
98 | ||
99 | if (!err) { | |
100 | put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata); | |
101 | security_release_secctx(secdata, seclen); | |
102 | } | |
103 | } | |
877ce7c1 CZ |
104 | } |
105 | #else | |
106 | static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm) | |
107 | { } | |
108 | #endif /* CONFIG_SECURITY_NETWORK */ | |
109 | ||
1da177e4 LT |
110 | static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg, |
111 | struct scm_cookie *scm, int flags) | |
112 | { | |
fd2c3ef7 | 113 | if (!msg->msg_control) { |
1da177e4 LT |
114 | if (test_bit(SOCK_PASSCRED, &sock->flags) || scm->fp) |
115 | msg->msg_flags |= MSG_CTRUNC; | |
f78a5fda | 116 | scm_destroy(scm); |
1da177e4 LT |
117 | return; |
118 | } | |
119 | ||
dbe9a417 EB |
120 | if (test_bit(SOCK_PASSCRED, &sock->flags)) { |
121 | struct user_namespace *current_ns = current_user_ns(); | |
122 | struct ucred ucreds = { | |
123 | .pid = scm->creds.pid, | |
124 | .uid = from_kuid_munged(current_ns, scm->creds.uid), | |
125 | .gid = from_kgid_munged(current_ns, scm->creds.gid), | |
126 | }; | |
127 | put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(ucreds), &ucreds); | |
128 | } | |
1da177e4 | 129 | |
f78a5fda DM |
130 | scm_destroy_cred(scm); |
131 | ||
877ce7c1 CZ |
132 | scm_passec(sock, msg, scm); |
133 | ||
1da177e4 LT |
134 | if (!scm->fp) |
135 | return; | |
136 | ||
137 | scm_detach_fds(msg, scm); | |
138 | } | |
139 | ||
140 | ||
141 | #endif /* __LINUX_NET_SCM_H */ | |
142 |