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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_fp_list {
16 struct list_head list;
17 short count;
18 short max;
19 struct file *fp[SCM_MAX_FD];
20};
21
22struct scm_cookie {
23 struct pid *pid; /* Skb credentials */
24 const struct cred *cred;
25 struct scm_fp_list *fp; /* Passed files */
26 struct ucred creds; /* Skb credentials */
27#ifdef CONFIG_SECURITY_NETWORK
28 u32 secid; /* Passed security ID */
29#endif
30};
31
32extern void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm);
33extern void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm);
34extern int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm);
35extern void __scm_destroy(struct scm_cookie *scm);
36extern struct scm_fp_list * scm_fp_dup(struct scm_fp_list *fpl);
37
38#ifdef CONFIG_SECURITY_NETWORK
39static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
40{
41 security_socket_getpeersec_dgram(sock, NULL, &scm->secid);
42}
43#else
44static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
45{ }
46#endif /* CONFIG_SECURITY_NETWORK */
47
48static __inline__ void scm_set_cred(struct scm_cookie *scm,
49 struct pid *pid, const struct cred *cred)
50{
51 scm->pid = get_pid(pid);
52 scm->cred = get_cred(cred);
53 cred_to_ucred(pid, cred, &scm->creds);
54}
55
56static __inline__ void scm_destroy_cred(struct scm_cookie *scm)
57{
58 put_pid(scm->pid);
59 scm->pid = NULL;
60
61 if (scm->cred)
62 put_cred(scm->cred);
63 scm->cred = NULL;
64}
65
66static __inline__ void scm_destroy(struct scm_cookie *scm)
67{
68 scm_destroy_cred(scm);
69 if (scm && scm->fp)
70 __scm_destroy(scm);
71}
72
73static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
74 struct scm_cookie *scm)
75{
76 scm_set_cred(scm, task_tgid(current), current_cred());
77 scm->fp = NULL;
78 unix_get_peersec_dgram(sock, scm);
79 if (msg->msg_controllen <= 0)
80 return 0;
81 return __scm_send(sock, msg, scm);
82}
83
84#ifdef CONFIG_SECURITY_NETWORK
85static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
86{
87 char *secdata;
88 u32 seclen;
89 int err;
90
91 if (test_bit(SOCK_PASSSEC, &sock->flags)) {
92 err = security_secid_to_secctx(scm->secid, &secdata, &seclen);
93
94 if (!err) {
95 put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
96 security_release_secctx(secdata, seclen);
97 }
98 }
99}
100#else
101static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
102{ }
103#endif /* CONFIG_SECURITY_NETWORK */
104
105static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg,
106 struct scm_cookie *scm, int flags)
107{
108 if (!msg->msg_control) {
109 if (test_bit(SOCK_PASSCRED, &sock->flags) || scm->fp)
110 msg->msg_flags |= MSG_CTRUNC;
111 scm_destroy(scm);
112 return;
113 }
114
115 if (test_bit(SOCK_PASSCRED, &sock->flags))
116 put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds);
117
118 scm_destroy_cred(scm);
119
120 scm_passec(sock, msg, scm);
121
122 if (!scm->fp)
123 return;
124
125 scm_detach_fds(msg, scm);
126}
127
128
129#endif /* __LINUX_NET_SCM_H */
130
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __LINUX_NET_SCM_H
3#define __LINUX_NET_SCM_H
4
5#include <linux/limits.h>
6#include <linux/net.h>
7#include <linux/cred.h>
8#include <linux/security.h>
9#include <linux/pid.h>
10#include <linux/nsproxy.h>
11
12/* Well, we should have at least one descriptor open
13 * to accept passed FDs 8)
14 */
15#define SCM_MAX_FD 253
16
17struct scm_creds {
18 u32 pid;
19 kuid_t uid;
20 kgid_t gid;
21};
22
23struct scm_fp_list {
24 short count;
25 short max;
26 struct user_struct *user;
27 struct file *fp[SCM_MAX_FD];
28};
29
30struct scm_cookie {
31 struct pid *pid; /* Skb credentials */
32 struct scm_fp_list *fp; /* Passed files */
33 struct scm_creds creds; /* Skb credentials */
34#ifdef CONFIG_SECURITY_NETWORK
35 u32 secid; /* Passed security ID */
36#endif
37};
38
39void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm);
40void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm);
41int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm);
42void __scm_destroy(struct scm_cookie *scm);
43struct scm_fp_list *scm_fp_dup(struct scm_fp_list *fpl);
44
45#ifdef CONFIG_SECURITY_NETWORK
46static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
47{
48 security_socket_getpeersec_dgram(sock, NULL, &scm->secid);
49}
50#else
51static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
52{ }
53#endif /* CONFIG_SECURITY_NETWORK */
54
55static __inline__ void scm_set_cred(struct scm_cookie *scm,
56 struct pid *pid, kuid_t uid, kgid_t gid)
57{
58 scm->pid = get_pid(pid);
59 scm->creds.pid = pid_vnr(pid);
60 scm->creds.uid = uid;
61 scm->creds.gid = gid;
62}
63
64static __inline__ void scm_destroy_cred(struct scm_cookie *scm)
65{
66 put_pid(scm->pid);
67 scm->pid = NULL;
68}
69
70static __inline__ void scm_destroy(struct scm_cookie *scm)
71{
72 scm_destroy_cred(scm);
73 if (scm->fp)
74 __scm_destroy(scm);
75}
76
77static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
78 struct scm_cookie *scm, bool forcecreds)
79{
80 memset(scm, 0, sizeof(*scm));
81 scm->creds.uid = INVALID_UID;
82 scm->creds.gid = INVALID_GID;
83 if (forcecreds)
84 scm_set_cred(scm, task_tgid(current), current_uid(), current_gid());
85 unix_get_peersec_dgram(sock, scm);
86 if (msg->msg_controllen <= 0)
87 return 0;
88 return __scm_send(sock, msg, scm);
89}
90
91#ifdef CONFIG_SECURITY_NETWORK
92static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
93{
94 char *secdata;
95 u32 seclen;
96 int err;
97
98 if (test_bit(SOCK_PASSSEC, &sock->flags)) {
99 err = security_secid_to_secctx(scm->secid, &secdata, &seclen);
100
101 if (!err) {
102 put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
103 security_release_secctx(secdata, seclen);
104 }
105 }
106}
107#else
108static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
109{ }
110#endif /* CONFIG_SECURITY_NETWORK */
111
112static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg,
113 struct scm_cookie *scm, int flags)
114{
115 if (!msg->msg_control) {
116 if (test_bit(SOCK_PASSCRED, &sock->flags) || scm->fp)
117 msg->msg_flags |= MSG_CTRUNC;
118 scm_destroy(scm);
119 return;
120 }
121
122 if (test_bit(SOCK_PASSCRED, &sock->flags)) {
123 struct user_namespace *current_ns = current_user_ns();
124 struct ucred ucreds = {
125 .pid = scm->creds.pid,
126 .uid = from_kuid_munged(current_ns, scm->creds.uid),
127 .gid = from_kgid_munged(current_ns, scm->creds.gid),
128 };
129 put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(ucreds), &ucreds);
130 }
131
132 scm_destroy_cred(scm);
133
134 scm_passec(sock, msg, scm);
135
136 if (!scm->fp)
137 return;
138
139 scm_detach_fds(msg, scm);
140}
141
142
143#endif /* __LINUX_NET_SCM_H */
144