security/smack/smack.h

   1 /*
   2  * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
   3  *
   4  *      This program is free software; you can redistribute it and/or modify
   5  *      it under the terms of the GNU General Public License as published by
   6  *      the Free Software Foundation, version 2.
   7  *
   8  * Author:
   9  *      Casey Schaufler <casey@schaufler-ca.com>
  10  *
  11  */
  12
  13 #ifndef _SECURITY_SMACK_H
  14 #define _SECURITY_SMACK_H
  15
  16 #include <linux/capability.h>
  17 #include <linux/spinlock.h>
  18 #include <net/netlabel.h>
  19
  20 /*
  21  * Why 23? CIPSO is constrained to 30, so a 32 byte buffer is
  22  * bigger than can be used, and 24 is the next lower multiple
  23  * of 8, and there are too many issues if there isn't space set
  24  * aside for the terminating null byte.
  25  */
  26 #define SMK_MAXLEN      23
  27 #define SMK_LABELLEN    (SMK_MAXLEN+1)
  28
  29 <<<<<<< HEAD:security/smack/smack.h
  30 /*
  31  * How many kinds of access are there?
  32  * Here's your answer.
  33  */
  34 #define SMK_ACCESSDASH  '-'
  35 #define SMK_ACCESSLOW   "rwxa"
  36 #define SMK_ACCESSKINDS (sizeof(SMK_ACCESSLOW) - 1)
  37
  38 =======
  39 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:security/smack/smack.h
  40 struct superblock_smack {
  41         char            *smk_root;
  42         char            *smk_floor;
  43         char            *smk_hat;
  44         char            *smk_default;
  45         int             smk_initialized;
  46         spinlock_t      smk_sblock;     /* for initialization */
  47 };
  48
  49 struct socket_smack {
  50         char            *smk_out;                       /* outbound label */
  51         char            *smk_in;                        /* inbound label */
  52         char            smk_packet[SMK_LABELLEN];       /* TCP peer label */
  53 };
  54
  55 /*
  56  * Inode smack data
  57  */
  58 struct inode_smack {
  59         char            *smk_inode;     /* label of the fso */
  60         struct mutex    smk_lock;       /* initialization lock */
  61         int             smk_flags;      /* smack inode flags */
  62 };
  63
  64 #define SMK_INODE_INSTANT       0x01    /* inode is instantiated */
  65
  66 /*
  67  * A label access rule.
  68  */
  69 struct smack_rule {
  70         char    *smk_subject;
  71         char    *smk_object;
  72         int     smk_access;
  73 };
  74
  75 /*
  76  * An entry in the table of permitted label accesses.
  77  */
  78 struct smk_list_entry {
  79         struct smk_list_entry   *smk_next;
  80         struct smack_rule       smk_rule;
  81 };
  82
  83 /*
  84  * An entry in the table mapping smack values to
  85  * CIPSO level/category-set values.
  86  */
  87 struct smack_cipso {
  88         int     smk_level;
  89         char    smk_catset[SMK_LABELLEN];
  90 };
  91
  92 /*
  93  * This is the repository for labels seen so that it is
  94  * not necessary to keep allocating tiny chuncks of memory
  95  * and so that they can be shared.
  96  *
  97  * Labels are never modified in place. Anytime a label
  98  * is imported (e.g. xattrset on a file) the list is checked
  99  * for it and it is added if it doesn't exist. The address
 100  * is passed out in either case. Entries are added, but
 101  * never deleted.
 102  *
 103  * Since labels are hanging around anyway it doesn't
 104  * hurt to maintain a secid for those awkward situations
 105  * where kernel components that ought to use LSM independent
 106  * interfaces don't. The secid should go away when all of
 107  * these components have been repaired.
 108  *
 109  * If there is a cipso value associated with the label it
 110  * gets stored here, too. This will most likely be rare as
 111  * the cipso direct mapping in used internally.
 112  */
 113 struct smack_known {
 114         struct smack_known      *smk_next;
 115         char                    smk_known[SMK_LABELLEN];
 116         u32                     smk_secid;
 117         struct smack_cipso      *smk_cipso;
 118         spinlock_t              smk_cipsolock; /* for changing cipso map */
 119 };
 120
 121 /*
 122  * Mount options
 123  */
 124 #define SMK_FSDEFAULT   "smackfsdef="
 125 #define SMK_FSFLOOR     "smackfsfloor="
 126 #define SMK_FSHAT       "smackfshat="
 127 #define SMK_FSROOT      "smackfsroot="
 128
 129 /*
 130  * xattr names
 131  */
 132 #define XATTR_SMACK_SUFFIX      "SMACK64"
 133 #define XATTR_SMACK_IPIN        "SMACK64IPIN"
 134 #define XATTR_SMACK_IPOUT       "SMACK64IPOUT"
 135 #define XATTR_NAME_SMACK        XATTR_SECURITY_PREFIX XATTR_SMACK_SUFFIX
 136 #define XATTR_NAME_SMACKIPIN    XATTR_SECURITY_PREFIX XATTR_SMACK_IPIN
 137 #define XATTR_NAME_SMACKIPOUT   XATTR_SECURITY_PREFIX XATTR_SMACK_IPOUT
 138
 139 /*
 140  * smackfs macic number
 141  */
 142 #define SMACK_MAGIC     0x43415d53 /* "SMAC" */
 143
 144 /*
 145  * A limit on the number of entries in the lists
 146  * makes some of the list administration easier.
 147  */
 148 #define SMACK_LIST_MAX  10000
 149
 150 /*
 151  * CIPSO defaults.
 152  */
 153 #define SMACK_CIPSO_DOI_DEFAULT         3       /* Historical */
 154 #define SMACK_CIPSO_DIRECT_DEFAULT      250     /* Arbitrary */
 155 #define SMACK_CIPSO_MAXCATVAL           63      /* Bigger gets harder */
 156 #define SMACK_CIPSO_MAXLEVEL            255     /* CIPSO 2.2 standard */
 157 #define SMACK_CIPSO_MAXCATNUM           239     /* CIPSO 2.2 standard */
 158
 159 /*
 160  * Just to make the common cases easier to deal with
 161  */
 162 #define MAY_ANY         (MAY_READ | MAY_WRITE | MAY_APPEND | MAY_EXEC)
 163 #define MAY_ANYREAD     (MAY_READ | MAY_EXEC)
 164 #define MAY_ANYWRITE    (MAY_WRITE | MAY_APPEND)
 165 #define MAY_READWRITE   (MAY_READ | MAY_WRITE)
 166 #define MAY_NOT         0
 167
 168 /*
 169  * These functions are in smack_lsm.c
 170  */
 171 struct inode_smack *new_inode_smack(char *);
 172
 173 /*
 174  * These functions are in smack_access.c
 175  */
 176 int smk_access(char *, char *, int);
 177 int smk_curacc(char *, u32);
 178 int smack_to_cipso(const char *, struct smack_cipso *);
 179 void smack_from_cipso(u32, char *, char *);
 180 char *smack_from_secid(const u32);
 181 char *smk_import(const char *, int);
 182 struct smack_known *smk_import_entry(const char *, int);
 183 u32 smack_to_secid(const char *);
 184
 185 /*
 186  * Shared data.
 187  */
 188 extern int smack_cipso_direct;
 189 extern int smack_net_nltype;
 190 extern char *smack_net_ambient;
 191
 192 extern struct smack_known *smack_known;
 193 extern struct smack_known smack_known_floor;
 194 extern struct smack_known smack_known_hat;
 195 extern struct smack_known smack_known_huh;
 196 extern struct smack_known smack_known_invalid;
 197 extern struct smack_known smack_known_star;
 198 extern struct smack_known smack_known_unset;
 199
 200 extern struct smk_list_entry *smack_list;
 201
 202 /*
 203  * Stricly for CIPSO level manipulation.
 204  * Set the category bit number in a smack label sized buffer.
 205  */
 206 static inline void smack_catset_bit(int cat, char *catsetp)
 207 {
 208         if (cat > SMK_LABELLEN * 8)
 209                 return;
 210
 211         catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
 212 }
 213
 214 /*
 215  * Present a pointer to the smack label in an inode blob.
 216  */
 217 static inline char *smk_of_inode(const struct inode *isp)
 218 {
 219         struct inode_smack *sip = isp->i_security;
 220         return sip->smk_inode;
 221 }
 222
 223 #endif  /* _SECURITY_SMACK_H */