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145 lines
3.5 KiB
145 lines
3.5 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __LINUX_NET_SCM_H |
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#define __LINUX_NET_SCM_H |
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#include <linux/limits.h> |
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#include <linux/net.h> |
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#include <linux/cred.h> |
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#include <linux/security.h> |
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#include <linux/pid.h> |
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#include <linux/nsproxy.h> |
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#include <linux/sched/signal.h> |
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/* Well, we should have at least one descriptor open |
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* to accept passed FDs 8) |
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*/ |
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#define SCM_MAX_FD 253 |
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struct scm_creds { |
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u32 pid; |
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kuid_t uid; |
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kgid_t gid; |
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}; |
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struct scm_fp_list { |
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short count; |
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short max; |
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struct user_struct *user; |
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struct file *fp[SCM_MAX_FD]; |
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}; |
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struct scm_cookie { |
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struct pid *pid; /* Skb credentials */ |
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struct scm_fp_list *fp; /* Passed files */ |
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struct scm_creds creds; /* Skb credentials */ |
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#ifdef CONFIG_SECURITY_NETWORK |
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u32 secid; /* Passed security ID */ |
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#endif |
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}; |
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void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm); |
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void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm); |
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int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm); |
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void __scm_destroy(struct scm_cookie *scm); |
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struct scm_fp_list *scm_fp_dup(struct scm_fp_list *fpl); |
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#ifdef CONFIG_SECURITY_NETWORK |
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static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm) |
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{ |
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security_socket_getpeersec_dgram(sock, NULL, &scm->secid); |
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} |
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#else |
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static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm) |
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{ } |
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#endif /* CONFIG_SECURITY_NETWORK */ |
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static __inline__ void scm_set_cred(struct scm_cookie *scm, |
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struct pid *pid, kuid_t uid, kgid_t gid) |
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{ |
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scm->pid = get_pid(pid); |
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scm->creds.pid = pid_vnr(pid); |
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scm->creds.uid = uid; |
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scm->creds.gid = gid; |
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} |
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static __inline__ void scm_destroy_cred(struct scm_cookie *scm) |
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{ |
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put_pid(scm->pid); |
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scm->pid = NULL; |
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} |
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static __inline__ void scm_destroy(struct scm_cookie *scm) |
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{ |
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scm_destroy_cred(scm); |
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if (scm->fp) |
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__scm_destroy(scm); |
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} |
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static __inline__ int scm_send(struct socket *sock, struct msghdr *msg, |
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struct scm_cookie *scm, bool forcecreds) |
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{ |
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memset(scm, 0, sizeof(*scm)); |
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scm->creds.uid = INVALID_UID; |
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scm->creds.gid = INVALID_GID; |
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if (forcecreds) |
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scm_set_cred(scm, task_tgid(current), current_uid(), current_gid()); |
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unix_get_peersec_dgram(sock, scm); |
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if (msg->msg_controllen <= 0) |
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return 0; |
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return __scm_send(sock, msg, scm); |
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} |
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#ifdef CONFIG_SECURITY_NETWORK |
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static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm) |
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{ |
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char *secdata; |
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u32 seclen; |
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int err; |
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if (test_bit(SOCK_PASSSEC, &sock->flags)) { |
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err = security_secid_to_secctx(scm->secid, &secdata, &seclen); |
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if (!err) { |
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put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata); |
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security_release_secctx(secdata, seclen); |
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} |
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} |
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} |
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#else |
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static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm) |
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{ } |
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#endif /* CONFIG_SECURITY_NETWORK */ |
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static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg, |
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struct scm_cookie *scm, int flags) |
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{ |
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if (!msg->msg_control) { |
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if (test_bit(SOCK_PASSCRED, &sock->flags) || scm->fp) |
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msg->msg_flags |= MSG_CTRUNC; |
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scm_destroy(scm); |
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return; |
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} |
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if (test_bit(SOCK_PASSCRED, &sock->flags)) { |
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struct user_namespace *current_ns = current_user_ns(); |
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struct ucred ucreds = { |
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.pid = scm->creds.pid, |
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.uid = from_kuid_munged(current_ns, scm->creds.uid), |
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.gid = from_kgid_munged(current_ns, scm->creds.gid), |
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}; |
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put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(ucreds), &ucreds); |
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} |
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scm_destroy_cred(scm); |
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scm_passec(sock, msg, scm); |
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if (!scm->fp) |
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return; |
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scm_detach_fds(msg, scm); |
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} |
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#endif /* __LINUX_NET_SCM_H */ |
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