/* $OpenBSD: intercept.h,v 1.19 2003/10/08 16:32:44 sturm Exp $ */ /* * Copyright 2002 Niels Provos * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Niels Provos. * 4. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifndef _INTERCEPT_H_ #define _INTERCEPT_H_ #include #include struct intercept_pid; struct intercept_replace; struct elevate; struct intercept_system { char *name; int (*init)(void); int (*open)(void); int (*attach)(int, pid_t); int (*detach)(int, pid_t); int (*report)(int, pid_t); int (*read)(int); int (*getsyscallnumber)(const char *, const char *); int (*setcwd)(int, pid_t); int (*restcwd)(int); int (*io)(int, pid_t, int, void *, u_char *, size_t); int (*getarg)(int, void *, int, void **); int (*answer)(int, pid_t, u_int32_t, short, int, short, struct elevate *); int (*newpolicy)(int); int (*assignpolicy)(int, pid_t, int); int (*policy)(int, int, int, short); int (*replace)(int, pid_t, u_int16_t, struct intercept_replace *); void (*clonepid)(struct intercept_pid *, struct intercept_pid *); void (*freepid)(struct intercept_pid *); }; #define INTERCEPT_READ 1 #define INTERCEPT_WRITE 2 #define ICPOLICY_ASK 0 #define ICPOLICY_PERMIT -1 #define ICPOLICY_KILL -2 #define ICPOLICY_NEVER 1 /* overloaded with errno values > 1 */ #define ICLINK_NONE 0 /* do not resolve symlinks */ #define ICLINK_ALL 1 /* resolve all symlinks */ #define ICLINK_NOLAST 2 /* do not resolve last component */ #define ICFLAGS_RESULT 1 #define ICTRANS_NOLINKS 1 /* translation should have no symlinks */ /* Privilege elevation */ struct elevate { #define ELEVATE_UID 0x01 #define ELEVATE_GID 0x02 int e_flags; uid_t e_uid; gid_t e_gid; }; struct intercept_pid { SPLAY_ENTRY(intercept_pid) next; pid_t pid; pid_t ppid; /* parent pid */ short policynr; int execve_code; short execve_policy; char *name; /* name of current process image */ char *newname; /* image name to be committed by execve */ uid_t uid; /* current uid */ gid_t gid; /* current gid */ char username[MAXLOGNAME]; char home[MAXPATHLEN]; /* current home dir for uid */ void *data; int uflags; /* Flags that can be used by external application */ struct elevate *elevate; /* privilege elevation request */ }; #define INTERCEPT_MAXSYSCALLARGS 10 struct intercept_translate { char *name; int (*translate)(struct intercept_translate *, int, pid_t, void *); int (*print)(char *, size_t, struct intercept_translate *); int off2; int off; u_char trans_valid; void *trans_addr; void *trans_addr2; void *trans_data; size_t trans_size; char *trans_print; u_int trans_flags; TAILQ_ENTRY(intercept_translate) next; }; struct intercept_replace { int num; int ind[INTERCEPT_MAXSYSCALLARGS]; u_char *address[INTERCEPT_MAXSYSCALLARGS]; size_t len[INTERCEPT_MAXSYSCALLARGS]; u_int flags[INTERCEPT_MAXSYSCALLARGS]; }; TAILQ_HEAD(intercept_tlq, intercept_translate); int intercept_init(void); pid_t intercept_run(int, int, uid_t, gid_t, char *, char * const *); int intercept_open(void); int intercept_attach(int, pid_t); int intercept_attachpid(int, pid_t, char *); int intercept_detach(int, pid_t); int intercept_read(int); int intercept_newpolicy(int); int intercept_assignpolicy(int, pid_t, int); int intercept_modifypolicy(int, int, const char *, const char *, short); void intercept_child_info(pid_t, pid_t); void intercept_policy_free(int); int intercept_replace_init(struct intercept_replace *); int intercept_replace_add(struct intercept_replace *, int, u_char *, size_t, u_int); int intercept_replace(int, pid_t, u_int16_t, struct intercept_replace *); int intercept_register_sccb(char *, char *, short (*)(int, pid_t, int, const char *, int, const char *, void *, int, struct intercept_replace *, struct intercept_tlq *, void *), void *); void *intercept_sccb_cbarg(char *, char *); int intercept_register_gencb(short (*)(int, pid_t, int, const char *, int, const char *, void *, int, void *), void *); int intercept_register_execcb(void (*)(int, pid_t, int, const char *, const char *, void *), void *); int intercept_register_pfreecb(void (*)(int, void *), void *); struct intercept_translate *intercept_register_translation(char *, char *, int, struct intercept_translate *); int intercept_translate(struct intercept_translate *, int, pid_t, int, void *, int); char *intercept_translate_print(struct intercept_translate *); #define intercept_register_transstring(x,y,z) \ intercept_register_translation(x, y, z, &ic_translate_string) #define intercept_register_transfn(x,y,z) \ intercept_register_translation(x, y, z, &ic_translate_filename) #define intercept_register_translink(x,y,z) \ intercept_register_translation(x, y, z, &ic_translate_linkname) extern struct intercept_translate ic_translate_string; extern struct intercept_translate ic_translate_filename; extern struct intercept_translate ic_translate_linkname; extern struct intercept_translate ic_translate_unlinkname; extern struct intercept_translate ic_translate_connect; void intercept_freepid(pid_t); struct intercept_pid *intercept_findpid(pid_t); struct intercept_pid *intercept_getpid(pid_t); int intercept_existpids(void); char *intercept_get_string(int, pid_t, void *); char *normalize_filename(int, pid_t, char *, int); char *intercept_filename(int, pid_t, void *, int); void intercept_syscall(int, pid_t, u_int16_t, int, const char *, int, const char *, void *, int); void intercept_syscall_result(int, pid_t, u_int16_t, int, const char *, int, const char *, void *, int, int, void *); void intercept_ugid(struct intercept_pid *, uid_t, gid_t); void intercept_setpid(struct intercept_pid *, uid_t, gid_t); int intercept_isvalidsystemcall(char *, char *); #endif /* _INTERCEPT_H_ */