Loading...
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/file.h>
9#include <linux/security.h>
10#include <linux/pid.h>
11#include <linux/nsproxy.h>
12#include <linux/sched/signal.h>
13#include <net/compat.h>
14
15/* Well, we should have at least one descriptor open
16 * to accept passed FDs 8)
17 */
18#define SCM_MAX_FD 253
19
20struct scm_creds {
21 u32 pid;
22 kuid_t uid;
23 kgid_t gid;
24};
25
26#ifdef CONFIG_UNIX
27struct unix_edge;
28#endif
29
30struct scm_fp_list {
31 short count;
32 short count_unix;
33 short max;
34#ifdef CONFIG_UNIX
35 bool inflight;
36 bool dead;
37 struct list_head vertices;
38 struct unix_edge *edges;
39#endif
40 struct user_struct *user;
41 struct file *fp[SCM_MAX_FD];
42};
43
44struct scm_cookie {
45 struct pid *pid; /* Skb credentials */
46 struct scm_fp_list *fp; /* Passed files */
47 struct scm_creds creds; /* Skb credentials */
48#ifdef CONFIG_SECURITY_NETWORK
49 u32 secid; /* Passed security ID */
50#endif
51};
52
53void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm);
54void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm);
55int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm);
56void __scm_destroy(struct scm_cookie *scm);
57struct scm_fp_list *scm_fp_dup(struct scm_fp_list *fpl);
58
59#ifdef CONFIG_SECURITY_NETWORK
60static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
61{
62 security_socket_getpeersec_dgram(sock, NULL, &scm->secid);
63}
64#else
65static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
66{ }
67#endif /* CONFIG_SECURITY_NETWORK */
68
69static __inline__ void scm_set_cred(struct scm_cookie *scm,
70 struct pid *pid, kuid_t uid, kgid_t gid)
71{
72 scm->pid = get_pid(pid);
73 scm->creds.pid = pid_vnr(pid);
74 scm->creds.uid = uid;
75 scm->creds.gid = gid;
76}
77
78static __inline__ void scm_destroy_cred(struct scm_cookie *scm)
79{
80 put_pid(scm->pid);
81 scm->pid = NULL;
82}
83
84static __inline__ void scm_destroy(struct scm_cookie *scm)
85{
86 scm_destroy_cred(scm);
87 if (scm->fp)
88 __scm_destroy(scm);
89}
90
91static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
92 struct scm_cookie *scm, bool forcecreds)
93{
94 memset(scm, 0, sizeof(*scm));
95 scm->creds.uid = INVALID_UID;
96 scm->creds.gid = INVALID_GID;
97 if (forcecreds)
98 scm_set_cred(scm, task_tgid(current), current_uid(), current_gid());
99 unix_get_peersec_dgram(sock, scm);
100 if (msg->msg_controllen <= 0)
101 return 0;
102 return __scm_send(sock, msg, scm);
103}
104
105#ifdef CONFIG_SECURITY_NETWORK
106static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
107{
108 char *secdata;
109 u32 seclen;
110 int err;
111
112 if (test_bit(SOCK_PASSSEC, &sock->flags)) {
113 err = security_secid_to_secctx(scm->secid, &secdata, &seclen);
114
115 if (!err) {
116 put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
117 security_release_secctx(secdata, seclen);
118 }
119 }
120}
121
122static inline bool scm_has_secdata(struct socket *sock)
123{
124 return test_bit(SOCK_PASSSEC, &sock->flags);
125}
126#else
127static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
128{ }
129
130static inline bool scm_has_secdata(struct socket *sock)
131{
132 return false;
133}
134#endif /* CONFIG_SECURITY_NETWORK */
135
136static __inline__ void scm_pidfd_recv(struct msghdr *msg, struct scm_cookie *scm)
137{
138 struct file *pidfd_file = NULL;
139 int len, pidfd;
140
141 /* put_cmsg() doesn't return an error if CMSG is truncated,
142 * that's why we need to opencode these checks here.
143 */
144 if (msg->msg_flags & MSG_CMSG_COMPAT)
145 len = sizeof(struct compat_cmsghdr) + sizeof(int);
146 else
147 len = sizeof(struct cmsghdr) + sizeof(int);
148
149 if (msg->msg_controllen < len) {
150 msg->msg_flags |= MSG_CTRUNC;
151 return;
152 }
153
154 if (!scm->pid)
155 return;
156
157 pidfd = pidfd_prepare(scm->pid, 0, &pidfd_file);
158
159 if (put_cmsg(msg, SOL_SOCKET, SCM_PIDFD, sizeof(int), &pidfd)) {
160 if (pidfd_file) {
161 put_unused_fd(pidfd);
162 fput(pidfd_file);
163 }
164
165 return;
166 }
167
168 if (pidfd_file)
169 fd_install(pidfd, pidfd_file);
170}
171
172static inline bool __scm_recv_common(struct socket *sock, struct msghdr *msg,
173 struct scm_cookie *scm, int flags)
174{
175 if (!msg->msg_control) {
176 if (test_bit(SOCK_PASSCRED, &sock->flags) ||
177 test_bit(SOCK_PASSPIDFD, &sock->flags) ||
178 scm->fp || scm_has_secdata(sock))
179 msg->msg_flags |= MSG_CTRUNC;
180 scm_destroy(scm);
181 return false;
182 }
183
184 if (test_bit(SOCK_PASSCRED, &sock->flags)) {
185 struct user_namespace *current_ns = current_user_ns();
186 struct ucred ucreds = {
187 .pid = scm->creds.pid,
188 .uid = from_kuid_munged(current_ns, scm->creds.uid),
189 .gid = from_kgid_munged(current_ns, scm->creds.gid),
190 };
191 put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(ucreds), &ucreds);
192 }
193
194 scm_passec(sock, msg, scm);
195
196 if (scm->fp)
197 scm_detach_fds(msg, scm);
198
199 return true;
200}
201
202static inline void scm_recv(struct socket *sock, struct msghdr *msg,
203 struct scm_cookie *scm, int flags)
204{
205 if (!__scm_recv_common(sock, msg, scm, flags))
206 return;
207
208 scm_destroy_cred(scm);
209}
210
211static inline void scm_recv_unix(struct socket *sock, struct msghdr *msg,
212 struct scm_cookie *scm, int flags)
213{
214 if (!__scm_recv_common(sock, msg, scm, flags))
215 return;
216
217 if (test_bit(SOCK_PASSPIDFD, &sock->flags))
218 scm_pidfd_recv(msg, scm);
219
220 scm_destroy_cred(scm);
221}
222
223static inline int scm_recv_one_fd(struct file *f, int __user *ufd,
224 unsigned int flags)
225{
226 if (!ufd)
227 return -EFAULT;
228 return receive_fd(f, ufd, flags);
229}
230
231#endif /* __LINUX_NET_SCM_H */
232
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