verified_exec.h revision 1.8
1 /* $NetBSD: verified_exec.h,v 1.8 2005/05/19 20:16:19 elad Exp $ */ 2 3 /*- 4 * Copyright 2005 Elad Efrat <elad (at) bsd.org.il> 5 * Copyright 2005 Brett Lymn <blymn (at) netbsd.org> 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Brett Lymn and Elad Efrat 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Neither the name of The NetBSD Foundation nor the names of its 16 * contributors may be used to endorse or promote products derived 17 * from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: verified_exec.h,v 1.8 2005/05/19 20:16:19 elad Exp $"); 34 35 /* 36 * 37 * Definitions for the Verified Executables kernel function. 38 * 39 */ 40 #include <sys/param.h> 41 #include <sys/hash.h> 42 43 #ifndef V_EXEC_H 44 #define V_EXEC_H 1 45 46 /* Max length of the fingerprint type string, including terminating \0 char */ 47 #define VERIEXEC_TYPE_MAXLEN 9 48 49 struct veriexec_params { 50 unsigned char type; 51 unsigned char fp_type[VERIEXEC_TYPE_MAXLEN]; /* type of fingerprint 52 this is */ 53 char file[MAXPATHLEN]; 54 unsigned int size; /* number of bytes in the fingerprint */ 55 unsigned char *fingerprint; 56 }; 57 58 struct veriexec_sizing_params { 59 dev_t dev; 60 size_t hash_size; 61 }; 62 63 struct veriexec_fp_report { 64 unsigned int size; 65 unsigned char *fingerprints; 66 }; 67 68 69 /* 70 * Types of veriexec inodes we can have 71 */ 72 #define VERIEXEC_DIRECT 0 /* Allow direct execution */ 73 #define VERIEXEC_INDIRECT 1 /* Only allow indirect execution */ 74 #define VERIEXEC_FILE 2 /* Fingerprint of a plain file */ 75 76 #define VERIEXEC_LOAD _IOW('S', 0x1, struct veriexec_params) 77 #define VERIEXEC_TABLESIZE _IOW('S', 0x2, struct veriexec_sizing_params) 78 #define VERIEXEC_FINGERPRINTS _IOWR('S', 0x3, struct veriexec_fp_report) 79 80 /* Verified exec sysctl objects. */ 81 #define VERIEXEC_VERBOSE 1 /* Verbosity level. */ 82 #define VERIEXEC_STRICT 2 /* Strict mode level. */ 83 #define VERIEXEC_ALGORITHMS 3 /* Supported hashing algorithms. */ 84 85 #ifdef _KERNEL 86 void veriexecattach(struct device *, struct device *, void *); 87 int veriexecopen(dev_t, int, int, struct proc *); 88 int veriexecclose(dev_t, int, int, struct proc *); 89 int veriexecioctl(dev_t, u_long, caddr_t, int, struct proc *); 90 91 /* defined in kern_verifiedexec.c */ 92 extern char *veriexec_fp_names; 93 extern int veriexec_verbose; 94 extern int veriexec_strict; 95 96 /* 97 * Operations vector for verified exec, this defines the characteristics 98 * for the fingerprint type. 99 */ 100 101 /* Function types: init, update, final. */ 102 typedef void (*VERIEXEC_INIT_FN)(void *); 103 typedef void (*VERIEXEC_UPDATE_FN)(void *, u_char *, u_int); 104 typedef void (*VERIEXEC_FINAL_FN)(u_char *, void *); 105 106 struct veriexec_fp_ops { 107 char type[VERIEXEC_TYPE_MAXLEN]; 108 size_t hash_len; 109 size_t context_size; 110 VERIEXEC_INIT_FN init; 111 VERIEXEC_UPDATE_FN update; 112 VERIEXEC_FINAL_FN final; 113 LIST_ENTRY(veriexec_fp_ops) entries; 114 }; 115 116 /* 117 * list structure definitions - needed in kern_exec.c 118 */ 119 120 /* An entry in the per-device hash table. */ 121 struct veriexec_hash_entry { 122 ino_t inode; /* Inode number. */ 123 unsigned char type; /* Entry type. */ 124 unsigned char *fp; /* Fingerprint. */ 125 struct veriexec_fp_ops *ops; /* Fingerprint ops vector*/ 126 LIST_ENTRY(veriexec_hash_entry) entries; /* List pointer. */ 127 }; 128 129 LIST_HEAD(veriexec_hashhead, veriexec_hash_entry) *hash_tbl; 130 131 /* Veriexec hash table information. */ 132 struct veriexec_hashtbl { 133 struct veriexec_hashhead *hash_tbl; 134 size_t hash_size; /* Number of slots in the table. */ 135 dev_t hash_dev; /* Device ID the hash table refers to. */ 136 LIST_ENTRY(veriexec_hashtbl) hash_list; 137 }; 138 139 /* Global list of hash tables. */ 140 LIST_HEAD(, veriexec_hashtbl) veriexec_tables; 141 142 /* Mask to ensure bounded access to elements in the hash table. */ 143 #define VERIEXEC_HASH_MASK(tbl) ((tbl)->hash_size - 1) 144 145 /* Readable values for veriexec_report(). */ 146 #define REPORT_NOVERBOSE 0 147 #define REPORT_VERBOSE 1 148 #define REPORT_NOPANIC 0 149 #define REPORT_PANIC 1 150 #define REPORT_NOALARM 0 151 #define REPORT_ALARM 1 152 153 /* 154 * Hashing function: Takes an inode number modulus the mask to give back 155 * an index into the hash table. 156 */ 157 #define VERIEXEC_HASH(tbl, inode) \ 158 (hash32_buf(&(inode), sizeof((inode)), HASH32_BUF_INIT) \ 159 & VERIEXEC_HASH_MASK(tbl)) 160 161 void veriexec_init_fp_ops(void); 162 struct veriexec_fp_ops *veriexec_find_ops(u_char *name); 163 int veriexec_fp_calc(struct proc *, struct vnode *, 164 struct veriexec_hash_entry *, uint64_t, u_char *); 165 int veriexec_fp_cmp(struct veriexec_hash_entry *, u_char *); 166 167 struct veriexec_hashtbl *veriexec_tblfind(dev_t); 168 struct veriexec_hash_entry *veriexec_lookup(dev_t, ino_t); 169 int veriexec_hashadd(struct veriexec_hashtbl *, struct veriexec_hash_entry *); 170 171 int veriexec_verify(struct proc *, struct vnode *, struct vattr *, 172 const u_char *, int); 173 int veriexec_removechk(struct proc *, struct vnode *, const char *); 174 void veriexec_init_fp_ops(void); 175 void veriexec_report(const u_char *, const u_char *, struct vattr *, 176 struct proc *, int, int, int); 177 178 #endif 179 180 #ifdef VERIFIED_EXEC_DEBUG 181 #define veriexec_dprintf(x) printf x 182 #else 183 #define veriexec_dprintf(x) 184 #endif /* VERIFIED_EXEC_DEBUG */ 185 186 #endif 187
Indexes created Fri Sep 26 08:10:20 GMT 2025