Audit arguments to POSIX message queues, semaphores, and shared memory.

This requires minor changes to the audit framework to allow capturing
paths that are not filesystem paths (i.e., will not be canonicalised
relative to the process current working directory and/or filesystem
root).

Obtained from:	TrustedBSD Project
MFC after:	3 weeks
Sponsored by:	DARPA, AFRL

sys/kern/uipc_mqueue.c

@@ -1,7 +1,13 @@
 /*-
  * Copyright (c) 2005 David Xu <[email protected]>
+ * Copyright (c) 2016-2017 Robert N. M. Watson
  * All rights reserved.
  *
+ * Portions of this software were developed by BAE Systems, the University of
+ * Cambridge Computer Laboratory, and Memorial University under DARPA/AFRL
+ * contract FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent
+ * Computing (TC) research program.
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ -86,6 +92,8 @@ __FBSDID("$FreeBSD$");
 #include <sys/vnode.h>
 #include <machine/atomic.h>
 
+#include <security/audit/audit.h>
+
 FEATURE(p1003_1b_mqueue, "POSIX P1003.1B message queues support");
 
 /*
@@ -2012,6 +2020,9 @@ kern_kmq_open(struct thread *td, const char *upath, int flags, mode_t mode,
 	struct mqueue *mq;
 	int fd, error, len, cmode;
 
+	AUDIT_ARG_FFLAGS(flags);
+	AUDIT_ARG_MODE(mode);
+
 	fdp = td->td_proc->p_fd;
 	cmode = (((mode & ~fdp->fd_cmask) & ALLPERMS) & ~S_ISTXT);
 	mq = NULL;
@@ -2034,6 +2045,7 @@ kern_kmq_open(struct thread *td, const char *upath, int flags, mode_t mode,
 	len = strlen(path);
 	if (len < 2 || path[0] != '/' || strchr(path + 1, '/') != NULL)
 		return (EINVAL);
+	AUDIT_ARG_UPATH1_CANON(path);
 
 	error = falloc(td, &fp, &fd, O_CLOEXEC);
 	if (error)
@@ -2133,6 +2145,7 @@ sys_kmq_unlink(struct thread *td, struct kmq_unlink_args *uap)
 	len = strlen(path);
 	if (len < 2 || path[0] != '/' || strchr(path + 1, '/') != NULL)
 		return (EINVAL);
+	AUDIT_ARG_UPATH1_CANON(path);
 
 	sx_xlock(&mqfs_data.mi_lock);
 	pn = mqfs_search(mqfs_data.mi_root, path + 1, len - 1, td->td_ucred);
@@ -2210,6 +2223,7 @@ kern_kmq_setattr(struct thread *td, int mqd, const struct mq_attr *attr,
 	u_int oflag, flag;
 	int error;
 
+	AUDIT_ARG_FD(mqd);
 	if (attr != NULL && (attr->mq_flags & ~O_NONBLOCK) != 0)
 		return (EINVAL);
 	error = getmq(td, mqd, &fp, NULL, &mq);
@@ -2260,6 +2274,7 @@ sys_kmq_timedreceive(struct thread *td, struct kmq_timedreceive_args *uap)
 	int error;
 	int waitok;
 
+	AUDIT_ARG_FD(uap->mqd);
 	error = getmq_read(td, uap->mqd, &fp, NULL, &mq);
 	if (error)
 		return (error);
@@ -2285,6 +2300,7 @@ sys_kmq_timedsend(struct thread *td, struct kmq_timedsend_args *uap)
 	struct timespec *abs_timeout, ets;
 	int error, waitok;
 
+	AUDIT_ARG_FD(uap->mqd);
 	error = getmq_write(td, uap->mqd, &fp, NULL, &mq);
 	if (error)
 		return (error);
@@ -2315,6 +2331,7 @@ kern_kmq_notify(struct thread *td, int mqd, struct sigevent *sigev)
 	struct mqueue_notifier *nt, *newnt = NULL;
 	int error;
 
+	AUDIT_ARG_FD(mqd);
 	if (sigev != NULL) {
 		if (sigev->sigev_notify != SIGEV_SIGNAL &&
 		    sigev->sigev_notify != SIGEV_THREAD_ID &&
@@ -2780,6 +2797,7 @@ freebsd32_kmq_timedsend(struct thread *td,
 	int error;
 	int waitok;
 
+	AUDIT_ARG_FD(uap->mqd);
 	error = getmq_write(td, uap->mqd, &fp, NULL, &mq);
 	if (error)
 		return (error);
@@ -2809,6 +2827,7 @@ freebsd32_kmq_timedreceive(struct thread *td,
 	struct timespec *abs_timeout, ets;
 	int error, waitok;
 
+	AUDIT_ARG_FD(uap->mqd);
 	error = getmq_read(td, uap->mqd, &fp, NULL, &mq);
 	if (error)
 		return (error);

sys/kern/uipc_sem.c

@@ -1,14 +1,19 @@
 /*-
  * Copyright (c) 2002 Alfred Perlstein <[email protected]>
  * Copyright (c) 2003-2005 SPARTA, Inc.
- * Copyright (c) 2005 Robert N. M. Watson
+ * Copyright (c) 2005, 2016-2017 Robert N. M. Watson
  * All rights reserved.
  *
  * This software was developed for the FreeBSD Project in part by Network
  * Associates Laboratories, the Security Research Division of Network
  * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
  * as part of the DARPA CHATS research program.
  *
+ * Portions of this software were developed by BAE Systems, the University of
+ * Cambridge Computer Laboratory, and Memorial University under DARPA/AFRL
+ * contract FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent
+ * Computing (TC) research program.
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ -66,6 +71,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/user.h>
 #include <sys/vnode.h>
 
+#include <security/audit/audit.h>
 #include <security/mac/mac_framework.h>
 
 FEATURE(p1003_1b_semaphores, "POSIX P1003.1B semaphores support");
@@ -467,6 +473,10 @@ ksem_create(struct thread *td, const char *name, semid_t *semidp, mode_t mode,
 	Fnv32_t fnv;
 	int error, fd;
 
+	AUDIT_ARG_FFLAGS(flags);
+	AUDIT_ARG_MODE(mode);
+	AUDIT_ARG_VALUE(value);
+
 	if (value > SEM_VALUE_MAX)
 		return (EINVAL);
 
@@ -518,6 +528,7 @@ ksem_create(struct thread *td, const char *name, semid_t *semidp, mode_t mode,
 			return (error);
 		}
 
+		AUDIT_ARG_UPATH1_CANON(path);
 		fnv = fnv_32_str(path, FNV1_32_INIT);
 		sx_xlock(&ksem_dict_lock);
 		ks = ksem_lookup(path, fnv);
@@ -661,6 +672,7 @@ sys_ksem_unlink(struct thread *td, struct ksem_unlink_args *uap)
 		return (error);
 	}
 
+	AUDIT_ARG_UPATH1_CANON(path);
 	fnv = fnv_32_str(path, FNV1_32_INIT);
 	sx_xlock(&ksem_dict_lock);
 	error = ksem_remove(path, fnv, td->td_ucred);
@@ -684,6 +696,7 @@ sys_ksem_close(struct thread *td, struct ksem_close_args *uap)
 	int error;
 
 	/* No capability rights required to close a semaphore. */
+	AUDIT_ARG_FD(uap->id);
 	error = ksem_get(td, uap->id, cap_rights_init(&rights), &fp);
 	if (error)
 		return (error);
@@ -710,6 +723,7 @@ sys_ksem_post(struct thread *td, struct ksem_post_args *uap)
 	struct ksem *ks;
 	int error;
 
+	AUDIT_ARG_FD(uap->id);
 	error = ksem_get(td, uap->id,
 	    cap_rights_init(&rights, CAP_SEM_POST), &fp);
 	if (error)
@@ -802,6 +816,7 @@ kern_sem_wait(struct thread *td, semid_t id, int tryflag,
 	int error;
 
 	DP((">>> kern_sem_wait entered! pid=%d\n", (int)td->td_proc->p_pid));
+	AUDIT_ARG_FD(id);
 	error = ksem_get(td, id, cap_rights_init(&rights, CAP_SEM_WAIT), &fp);
 	if (error)
 		return (error);
@@ -869,6 +884,7 @@ sys_ksem_getvalue(struct thread *td, struct ksem_getvalue_args *uap)
 	struct ksem *ks;
 	int error, val;
 
+	AUDIT_ARG_FD(uap->id);
 	error = ksem_get(td, uap->id,
 	    cap_rights_init(&rights, CAP_SEM_GETVALUE), &fp);
 	if (error)
@@ -906,6 +922,7 @@ sys_ksem_destroy(struct thread *td, struct ksem_destroy_args *uap)
 	int error;
 
 	/* No capability rights required to close a semaphore. */
+	AUDIT_ARG_FD(uap->id);
 	error = ksem_get(td, uap->id, cap_rights_init(&rights), &fp);
 	if (error)
 		return (error);

sys/kern/uipc_shm.c

@@ -1,7 +1,12 @@
 /*-
- * Copyright (c) 2006, 2011 Robert N. M. Watson
+ * Copyright (c) 2006, 2011, 2016-2017 Robert N. M. Watson
  * All rights reserved.
  *
+ * Portions of this software were developed by BAE Systems, the University of
+ * Cambridge Computer Laboratory, and Memorial University under DARPA/AFRL
+ * contract FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent
+ * Computing (TC) research program.
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ -79,6 +84,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/unistd.h>
 #include <sys/user.h>
 
+#include <security/audit/audit.h>
 #include <security/mac/mac_framework.h>
 
 #include <vm/vm.h>
@@ -709,6 +715,9 @@ kern_shm_open(struct thread *td, const char *userpath, int flags, mode_t mode,
 		return (ECAPMODE);
 #endif
 
+	AUDIT_ARG_FFLAGS(flags);
+	AUDIT_ARG_MODE(mode);
+
 	if ((flags & O_ACCMODE) != O_RDONLY && (flags & O_ACCMODE) != O_RDWR)
 		return (EINVAL);
 
@@ -754,6 +763,7 @@ kern_shm_open(struct thread *td, const char *userpath, int flags, mode_t mode,
 			return (error);
 		}
 
+		AUDIT_ARG_UPATH1_CANON(path);
 		fnv = fnv_32_str(path, FNV1_32_INIT);
 		sx_xlock(&shm_dict_lock);
 		shmfd = shm_lookup(path, fnv);
@@ -858,6 +868,7 @@ sys_shm_unlink(struct thread *td, struct shm_unlink_args *uap)
 	if (KTRPOINT(curthread, KTR_NAMEI))
 		ktrnamei(path);
 #endif
+	AUDIT_ARG_UPATH1_CANON(path);
 	fnv = fnv_32_str(path, FNV1_32_INIT);
 	sx_xlock(&shm_dict_lock);
 	error = shm_remove(path, fnv, td->td_ucred);

sys/security/audit/audit.h

@@ -106,7 +106,9 @@ void	 audit_arg_auid(uid_t auid);
 void	 audit_arg_auditinfo(struct auditinfo *au_info);
 void	 audit_arg_auditinfo_addr(struct auditinfo_addr *au_info);
 void	 audit_arg_upath1(struct thread *td, int dirfd, char *upath);
+void	 audit_arg_upath1_canon(char *upath);
 void	 audit_arg_upath2(struct thread *td, int dirfd, char *upath);
+void	 audit_arg_upath2_canon(char *upath);
 void	 audit_arg_vnode1(struct vnode *vp);
 void	 audit_arg_vnode2(struct vnode *vp);
 void	 audit_arg_text(char *text);
@@ -334,11 +336,21 @@ void	 audit_thread_free(struct thread *td);
 		audit_arg_upath1((td), (dirfd), (upath));		\
 } while (0)
 
+#define	AUDIT_ARG_UPATH1_CANON(upath) do {				\
+	if (AUDITING_TD(curthread))					\
+		audit_arg_upath1_canon((upath));			\
+} while (0)
+
 #define	AUDIT_ARG_UPATH2(td, dirfd, upath) do {				\
 	if (AUDITING_TD(curthread))					\
 		audit_arg_upath2((td), (dirfd), (upath));		\
 } while (0)
 
+#define	AUDIT_ARG_UPATH2_CANON(upath) do {				\
+	if (AUDITING_TD(curthread))					\
+		audit_arg_upath2_canon((upath));			\
+} while (0)
+
 #define	AUDIT_ARG_VALUE(value) do {					\
 	if (AUDITING_TD(curthread))					\
 		audit_arg_value((value));				\
@@ -419,7 +431,9 @@ void	 audit_thread_free(struct thread *td);
 #define	AUDIT_ARG_TEXT(text)
 #define	AUDIT_ARG_UID(uid)
 #define	AUDIT_ARG_UPATH1(td, dirfd, upath)
+#define	AUDIT_ARG_UPATH1_NONCANON(td, upath)
 #define	AUDIT_ARG_UPATH2(td, dirfd, upath)
+#define	AUDIT_ARG_UPATH2_NONCANON(td, upath)
 #define	AUDIT_ARG_VALUE(value)
 #define	AUDIT_ARG_VNODE1(vp)
 #define	AUDIT_ARG_VNODE2(vp)

sys/security/audit/audit_arg.c

@@ -765,6 +765,48 @@ audit_arg_upath2(struct thread *td, int dirfd, char *upath)
 	ARG_SET_VALID(ar, ARG_UPATH2);
 }
 
+/*
+ * Variants on path auditing that do not canonicalise the path passed in;
+ * these are for use with filesystem-like subsystems that employ string names,
+ * but do not support a hierarchical namespace -- for example, POSIX IPC
+ * objects.  The subsystem should have performed any necessary
+ * canonicalisation required to make the paths useful to audit analysis.
+ */
+static void
+audit_arg_upath_canon(char *upath, char **pathp)
+{
+
+	if (*pathp == NULL)
+		*pathp = malloc(MAXPATHLEN, M_AUDITPATH, M_WAITOK);
+	(void)snprintf(*pathp, MAXPATHLEN, "%s", upath);
+}
+
+void
+audit_arg_upath1_canon(char *upath)
+{
+	struct kaudit_record *ar;
+
+	ar = currecord();
+	if (ar == NULL)
+		return;
+
+	audit_arg_upath_canon(upath, &ar->k_ar.ar_arg_upath1);
+	ARG_SET_VALID(ar, ARG_UPATH1);
+}
+
+void
+audit_arg_upath2_canon(char *upath)
+{
+	struct kaudit_record *ar;
+
+	ar = currecord();
+	if (ar == NULL)
+		return;
+
+	audit_arg_upath_canon(upath, &ar->k_ar.ar_arg_upath2);
+	ARG_SET_VALID(ar, ARG_UPATH2);
+}
+
 /*
  * Function to save the path and vnode attr information into the audit
  * record.