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