Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 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 | * Authors: |
| 9 | * Casey Schaufler <casey@schaufler-ca.com> |
| 10 | * Ahmed S. Darwish <darwish.07@gmail.com> |
| 11 | * |
| 12 | * Special thanks to the authors of selinuxfs. |
| 13 | * |
| 14 | * Karl MacMillan <kmacmillan@tresys.com> |
| 15 | * James Morris <jmorris@redhat.com> |
| 16 | * |
| 17 | */ |
| 18 | |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/vmalloc.h> |
| 21 | #include <linux/security.h> |
| 22 | #include <linux/mutex.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 23 | #include <linux/slab.h> |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 24 | #include <net/net_namespace.h> |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 25 | #include <net/cipso_ipv4.h> |
| 26 | #include <linux/seq_file.h> |
| 27 | #include <linux/ctype.h> |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 28 | #include <linux/audit.h> |
Casey Schaufler | 958d2c2 | 2013-04-02 11:41:18 -0700 | [diff] [blame] | 29 | #include <linux/magic.h> |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 30 | #include "smack.h" |
| 31 | |
| 32 | /* |
| 33 | * smackfs pseudo filesystem. |
| 34 | */ |
| 35 | |
| 36 | enum smk_inos { |
| 37 | SMK_ROOT_INO = 2, |
| 38 | SMK_LOAD = 3, /* load policy */ |
| 39 | SMK_CIPSO = 4, /* load label -> CIPSO mapping */ |
| 40 | SMK_DOI = 5, /* CIPSO DOI */ |
| 41 | SMK_DIRECT = 6, /* CIPSO level indicating direct label */ |
| 42 | SMK_AMBIENT = 7, /* internet ambient label */ |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 43 | SMK_NETLBLADDR = 8, /* single label hosts */ |
Casey Schaufler | 1544623 | 2008-07-30 15:37:11 -0700 | [diff] [blame] | 44 | SMK_ONLYCAP = 9, /* the only "capable" label */ |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 45 | SMK_LOGGING = 10, /* logging */ |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 46 | SMK_LOAD_SELF = 11, /* task specific rules */ |
Jarkko Sakkinen | 828716c | 2011-09-08 10:12:01 +0300 | [diff] [blame] | 47 | SMK_ACCESSES = 12, /* access policy */ |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 48 | SMK_MAPPED = 13, /* CIPSO level indicating mapped label */ |
| 49 | SMK_LOAD2 = 14, /* load policy with long labels */ |
| 50 | SMK_LOAD_SELF2 = 15, /* load task specific rules with long labels */ |
| 51 | SMK_ACCESS2 = 16, /* make an access check with long labels */ |
| 52 | SMK_CIPSO2 = 17, /* load long label -> CIPSO mapping */ |
Rafal Krypa | 449543b | 2012-07-11 17:49:30 +0200 | [diff] [blame] | 53 | SMK_REVOKE_SUBJ = 18, /* set rules with subject label to '-' */ |
Rafal Krypa | e05b6f9 | 2013-01-10 19:42:00 +0100 | [diff] [blame] | 54 | SMK_CHANGE_RULE = 19, /* change or add rules (long labels) */ |
Casey Schaufler | 00f84f3 | 2013-12-23 11:07:10 -0800 | [diff] [blame^] | 55 | SMK_SYSLOG = 20, /* change syslog label) */ |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 56 | }; |
| 57 | |
| 58 | /* |
| 59 | * List locks |
| 60 | */ |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 61 | static DEFINE_MUTEX(smack_cipso_lock); |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 62 | static DEFINE_MUTEX(smack_ambient_lock); |
Casey Schaufler | 00f84f3 | 2013-12-23 11:07:10 -0800 | [diff] [blame^] | 63 | static DEFINE_MUTEX(smack_syslog_lock); |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 64 | static DEFINE_MUTEX(smk_netlbladdr_lock); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 65 | |
| 66 | /* |
| 67 | * This is the "ambient" label for network traffic. |
| 68 | * If it isn't somehow marked, use this. |
| 69 | * It can be reset via smackfs/ambient |
| 70 | */ |
Casey Schaufler | 2f823ff | 2013-05-22 18:43:03 -0700 | [diff] [blame] | 71 | struct smack_known *smack_net_ambient; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 72 | |
| 73 | /* |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 74 | * This is the level in a CIPSO header that indicates a |
| 75 | * smack label is contained directly in the category set. |
| 76 | * It can be reset via smackfs/direct |
| 77 | */ |
| 78 | int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT; |
| 79 | |
Casey Schaufler | 1544623 | 2008-07-30 15:37:11 -0700 | [diff] [blame] | 80 | /* |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 81 | * This is the level in a CIPSO header that indicates a |
| 82 | * secid is contained directly in the category set. |
| 83 | * It can be reset via smackfs/mapped |
| 84 | */ |
| 85 | int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT; |
| 86 | |
| 87 | /* |
Casey Schaufler | 1544623 | 2008-07-30 15:37:11 -0700 | [diff] [blame] | 88 | * Unless a process is running with this label even |
| 89 | * having CAP_MAC_OVERRIDE isn't enough to grant |
| 90 | * privilege to violate MAC policy. If no label is |
| 91 | * designated (the NULL case) capabilities apply to |
| 92 | * everyone. It is expected that the hat (^) label |
| 93 | * will be used if any label is used. |
| 94 | */ |
Casey Schaufler | 00f84f3 | 2013-12-23 11:07:10 -0800 | [diff] [blame^] | 95 | struct smack_known *smack_onlycap; |
| 96 | |
| 97 | /* |
| 98 | * If this value is set restrict syslog use to the label specified. |
| 99 | * It can be reset via smackfs/syslog |
| 100 | */ |
| 101 | struct smack_known *smack_syslog_label; |
Casey Schaufler | 1544623 | 2008-07-30 15:37:11 -0700 | [diff] [blame] | 102 | |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 103 | /* |
| 104 | * Certain IP addresses may be designated as single label hosts. |
| 105 | * Packets are sent there unlabeled, but only from tasks that |
| 106 | * can write to the specified label. |
| 107 | */ |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 108 | |
| 109 | LIST_HEAD(smk_netlbladdr_list); |
Casey Schaufler | 272cd7a | 2011-09-20 12:24:36 -0700 | [diff] [blame] | 110 | |
| 111 | /* |
| 112 | * Rule lists are maintained for each label. |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 113 | * This master list is just for reading /smack/load and /smack/load2. |
Casey Schaufler | 272cd7a | 2011-09-20 12:24:36 -0700 | [diff] [blame] | 114 | */ |
| 115 | struct smack_master_list { |
| 116 | struct list_head list; |
| 117 | struct smack_rule *smk_rule; |
| 118 | }; |
| 119 | |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 120 | LIST_HEAD(smack_rule_list); |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 121 | |
Rafal Krypa | e05b6f9 | 2013-01-10 19:42:00 +0100 | [diff] [blame] | 122 | struct smack_parsed_rule { |
Casey Schaufler | 2f823ff | 2013-05-22 18:43:03 -0700 | [diff] [blame] | 123 | struct smack_known *smk_subject; |
Rafal Krypa | e05b6f9 | 2013-01-10 19:42:00 +0100 | [diff] [blame] | 124 | char *smk_object; |
| 125 | int smk_access1; |
| 126 | int smk_access2; |
| 127 | }; |
| 128 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 129 | static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 130 | |
Etienne Basset | 4303154 | 2009-03-27 17:11:01 -0400 | [diff] [blame] | 131 | const char *smack_cipso_option = SMACK_CIPSO_OPTION; |
| 132 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 133 | /* |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 134 | * Values for parsing cipso rules |
| 135 | * SMK_DIGITLEN: Length of a digit field in a rule. |
Ahmed S. Darwish | b500ce8 | 2008-03-13 12:32:34 -0700 | [diff] [blame] | 136 | * SMK_CIPSOMIN: Minimum possible cipso rule length. |
| 137 | * SMK_CIPSOMAX: Maximum possible cipso rule length. |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 138 | */ |
| 139 | #define SMK_DIGITLEN 4 |
Ahmed S. Darwish | b500ce8 | 2008-03-13 12:32:34 -0700 | [diff] [blame] | 140 | #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN) |
| 141 | #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN) |
| 142 | |
| 143 | /* |
| 144 | * Values for parsing MAC rules |
| 145 | * SMK_ACCESS: Maximum possible combination of access permissions |
| 146 | * SMK_ACCESSLEN: Maximum length for a rule access field |
| 147 | * SMK_LOADLEN: Smack rule length |
| 148 | */ |
Jarkko Sakkinen | 5c6d112 | 2010-12-07 13:34:01 +0200 | [diff] [blame] | 149 | #define SMK_OACCESS "rwxa" |
Casey Schaufler | c0ab6e5 | 2013-10-11 18:06:39 -0700 | [diff] [blame] | 150 | #define SMK_ACCESS "rwxatl" |
Jarkko Sakkinen | 5c6d112 | 2010-12-07 13:34:01 +0200 | [diff] [blame] | 151 | #define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1) |
| 152 | #define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1) |
| 153 | #define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN) |
| 154 | #define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN) |
Ahmed S. Darwish | b500ce8 | 2008-03-13 12:32:34 -0700 | [diff] [blame] | 155 | |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 156 | /* |
| 157 | * Stricly for CIPSO level manipulation. |
| 158 | * Set the category bit number in a smack label sized buffer. |
| 159 | */ |
| 160 | static inline void smack_catset_bit(unsigned int cat, char *catsetp) |
| 161 | { |
| 162 | if (cat == 0 || cat > (SMK_CIPSOLEN * 8)) |
| 163 | return; |
| 164 | |
| 165 | catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8); |
| 166 | } |
| 167 | |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 168 | /** |
| 169 | * smk_netlabel_audit_set - fill a netlbl_audit struct |
| 170 | * @nap: structure to fill |
| 171 | */ |
| 172 | static void smk_netlabel_audit_set(struct netlbl_audit *nap) |
| 173 | { |
Casey Schaufler | 2f823ff | 2013-05-22 18:43:03 -0700 | [diff] [blame] | 174 | struct smack_known *skp = smk_of_current(); |
| 175 | |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 176 | nap->loginuid = audit_get_loginuid(current); |
| 177 | nap->sessionid = audit_get_sessionid(current); |
Casey Schaufler | 2f823ff | 2013-05-22 18:43:03 -0700 | [diff] [blame] | 178 | nap->secid = skp->smk_secid; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 179 | } |
| 180 | |
| 181 | /* |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 182 | * Value for parsing single label host rules |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 183 | * "1.2.3.4 X" |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 184 | */ |
| 185 | #define SMK_NETLBLADDRMIN 9 |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 186 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 187 | /** |
Rafal Krypa | e05b6f9 | 2013-01-10 19:42:00 +0100 | [diff] [blame] | 188 | * smk_set_access - add a rule to the rule list or replace an old rule |
| 189 | * @srp: the rule to add or replace |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 190 | * @rule_list: the list of rules |
| 191 | * @rule_lock: the rule list lock |
Rafal Krypa | e05b6f9 | 2013-01-10 19:42:00 +0100 | [diff] [blame] | 192 | * @global: if non-zero, indicates a global rule |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 193 | * |
| 194 | * Looks through the current subject/object/access list for |
| 195 | * the subject/object pair and replaces the access that was |
| 196 | * there. If the pair isn't found add it with the specified |
| 197 | * access. |
Sergio Luis | 81ea714 | 2008-12-22 01:16:15 -0300 | [diff] [blame] | 198 | * |
| 199 | * Returns 0 if nothing goes wrong or -ENOMEM if it fails |
| 200 | * during the allocation of the new pair to add. |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 201 | */ |
Rafal Krypa | e05b6f9 | 2013-01-10 19:42:00 +0100 | [diff] [blame] | 202 | static int smk_set_access(struct smack_parsed_rule *srp, |
| 203 | struct list_head *rule_list, |
| 204 | struct mutex *rule_lock, int global) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 205 | { |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 206 | struct smack_rule *sp; |
Rafal Krypa | e05b6f9 | 2013-01-10 19:42:00 +0100 | [diff] [blame] | 207 | struct smack_master_list *smlp; |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 208 | int found = 0; |
Rafal Krypa | e05b6f9 | 2013-01-10 19:42:00 +0100 | [diff] [blame] | 209 | int rc = 0; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 210 | |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 211 | mutex_lock(rule_lock); |
| 212 | |
Casey Schaufler | 272cd7a | 2011-09-20 12:24:36 -0700 | [diff] [blame] | 213 | /* |
| 214 | * Because the object label is less likely to match |
| 215 | * than the subject label check it first |
| 216 | */ |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 217 | list_for_each_entry_rcu(sp, rule_list, list) { |
Casey Schaufler | 272cd7a | 2011-09-20 12:24:36 -0700 | [diff] [blame] | 218 | if (sp->smk_object == srp->smk_object && |
| 219 | sp->smk_subject == srp->smk_subject) { |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 220 | found = 1; |
Rafal Krypa | e05b6f9 | 2013-01-10 19:42:00 +0100 | [diff] [blame] | 221 | sp->smk_access |= srp->smk_access1; |
| 222 | sp->smk_access &= ~srp->smk_access2; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 223 | break; |
| 224 | } |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 225 | } |
| 226 | |
Rafal Krypa | e05b6f9 | 2013-01-10 19:42:00 +0100 | [diff] [blame] | 227 | if (found == 0) { |
| 228 | sp = kzalloc(sizeof(*sp), GFP_KERNEL); |
| 229 | if (sp == NULL) { |
| 230 | rc = -ENOMEM; |
| 231 | goto out; |
| 232 | } |
| 233 | |
| 234 | sp->smk_subject = srp->smk_subject; |
| 235 | sp->smk_object = srp->smk_object; |
| 236 | sp->smk_access = srp->smk_access1 & ~srp->smk_access2; |
| 237 | |
| 238 | list_add_rcu(&sp->list, rule_list); |
| 239 | /* |
| 240 | * If this is a global as opposed to self and a new rule |
| 241 | * it needs to get added for reporting. |
| 242 | */ |
| 243 | if (global) { |
| 244 | smlp = kzalloc(sizeof(*smlp), GFP_KERNEL); |
| 245 | if (smlp != NULL) { |
| 246 | smlp->smk_rule = sp; |
| 247 | list_add_rcu(&smlp->list, &smack_rule_list); |
| 248 | } else |
| 249 | rc = -ENOMEM; |
| 250 | } |
| 251 | } |
| 252 | |
| 253 | out: |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 254 | mutex_unlock(rule_lock); |
Rafal Krypa | e05b6f9 | 2013-01-10 19:42:00 +0100 | [diff] [blame] | 255 | return rc; |
| 256 | } |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 257 | |
Rafal Krypa | e05b6f9 | 2013-01-10 19:42:00 +0100 | [diff] [blame] | 258 | /** |
| 259 | * smk_perm_from_str - parse smack accesses from a text string |
| 260 | * @string: a text string that contains a Smack accesses code |
| 261 | * |
| 262 | * Returns an integer with respective bits set for specified accesses. |
| 263 | */ |
| 264 | static int smk_perm_from_str(const char *string) |
| 265 | { |
| 266 | int perm = 0; |
| 267 | const char *cp; |
| 268 | |
| 269 | for (cp = string; ; cp++) |
| 270 | switch (*cp) { |
| 271 | case '-': |
| 272 | break; |
| 273 | case 'r': |
| 274 | case 'R': |
| 275 | perm |= MAY_READ; |
| 276 | break; |
| 277 | case 'w': |
| 278 | case 'W': |
| 279 | perm |= MAY_WRITE; |
| 280 | break; |
| 281 | case 'x': |
| 282 | case 'X': |
| 283 | perm |= MAY_EXEC; |
| 284 | break; |
| 285 | case 'a': |
| 286 | case 'A': |
| 287 | perm |= MAY_APPEND; |
| 288 | break; |
| 289 | case 't': |
| 290 | case 'T': |
| 291 | perm |= MAY_TRANSMUTE; |
| 292 | break; |
Casey Schaufler | c0ab6e5 | 2013-10-11 18:06:39 -0700 | [diff] [blame] | 293 | case 'l': |
| 294 | case 'L': |
| 295 | perm |= MAY_LOCK; |
| 296 | break; |
Rafal Krypa | e05b6f9 | 2013-01-10 19:42:00 +0100 | [diff] [blame] | 297 | default: |
| 298 | return perm; |
| 299 | } |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 300 | } |
| 301 | |
| 302 | /** |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 303 | * smk_fill_rule - Fill Smack rule from strings |
| 304 | * @subject: subject label string |
| 305 | * @object: object label string |
Rafal Krypa | e05b6f9 | 2013-01-10 19:42:00 +0100 | [diff] [blame] | 306 | * @access1: access string |
| 307 | * @access2: string with permissions to be removed |
Jarkko Sakkinen | 0e94ae1 | 2011-10-18 21:21:36 +0300 | [diff] [blame] | 308 | * @rule: Smack rule |
| 309 | * @import: if non-zero, import labels |
Casey Schaufler | 3518721 | 2012-06-18 19:01:36 -0700 | [diff] [blame] | 310 | * @len: label length limit |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 311 | * |
Jarkko Sakkinen | 398ce07 | 2013-11-28 19:16:46 +0200 | [diff] [blame] | 312 | * Returns 0 on success, -EINVAL on failure and -ENOENT when either subject |
| 313 | * or object is missing. |
Jarkko Sakkinen | 828716c | 2011-09-08 10:12:01 +0300 | [diff] [blame] | 314 | */ |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 315 | static int smk_fill_rule(const char *subject, const char *object, |
Rafal Krypa | e05b6f9 | 2013-01-10 19:42:00 +0100 | [diff] [blame] | 316 | const char *access1, const char *access2, |
| 317 | struct smack_parsed_rule *rule, int import, |
| 318 | int len) |
Jarkko Sakkinen | 828716c | 2011-09-08 10:12:01 +0300 | [diff] [blame] | 319 | { |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 320 | const char *cp; |
Jarkko Sakkinen | 0e94ae1 | 2011-10-18 21:21:36 +0300 | [diff] [blame] | 321 | struct smack_known *skp; |
Jarkko Sakkinen | 828716c | 2011-09-08 10:12:01 +0300 | [diff] [blame] | 322 | |
Jarkko Sakkinen | 0e94ae1 | 2011-10-18 21:21:36 +0300 | [diff] [blame] | 323 | if (import) { |
Casey Schaufler | 2f823ff | 2013-05-22 18:43:03 -0700 | [diff] [blame] | 324 | rule->smk_subject = smk_import_entry(subject, len); |
Jarkko Sakkinen | 0e94ae1 | 2011-10-18 21:21:36 +0300 | [diff] [blame] | 325 | if (rule->smk_subject == NULL) |
Jarkko Sakkinen | 398ce07 | 2013-11-28 19:16:46 +0200 | [diff] [blame] | 326 | return -EINVAL; |
Jarkko Sakkinen | 0e94ae1 | 2011-10-18 21:21:36 +0300 | [diff] [blame] | 327 | |
Casey Schaufler | 3518721 | 2012-06-18 19:01:36 -0700 | [diff] [blame] | 328 | rule->smk_object = smk_import(object, len); |
Jarkko Sakkinen | 0e94ae1 | 2011-10-18 21:21:36 +0300 | [diff] [blame] | 329 | if (rule->smk_object == NULL) |
Jarkko Sakkinen | 398ce07 | 2013-11-28 19:16:46 +0200 | [diff] [blame] | 330 | return -EINVAL; |
Jarkko Sakkinen | 0e94ae1 | 2011-10-18 21:21:36 +0300 | [diff] [blame] | 331 | } else { |
Casey Schaufler | 3518721 | 2012-06-18 19:01:36 -0700 | [diff] [blame] | 332 | cp = smk_parse_smack(subject, len); |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 333 | if (cp == NULL) |
Jarkko Sakkinen | 398ce07 | 2013-11-28 19:16:46 +0200 | [diff] [blame] | 334 | return -EINVAL; |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 335 | skp = smk_find_entry(cp); |
| 336 | kfree(cp); |
Jarkko Sakkinen | 0e94ae1 | 2011-10-18 21:21:36 +0300 | [diff] [blame] | 337 | if (skp == NULL) |
Jarkko Sakkinen | 398ce07 | 2013-11-28 19:16:46 +0200 | [diff] [blame] | 338 | return -ENOENT; |
Casey Schaufler | 2f823ff | 2013-05-22 18:43:03 -0700 | [diff] [blame] | 339 | rule->smk_subject = skp; |
Jarkko Sakkinen | 0e94ae1 | 2011-10-18 21:21:36 +0300 | [diff] [blame] | 340 | |
Casey Schaufler | 3518721 | 2012-06-18 19:01:36 -0700 | [diff] [blame] | 341 | cp = smk_parse_smack(object, len); |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 342 | if (cp == NULL) |
Jarkko Sakkinen | 398ce07 | 2013-11-28 19:16:46 +0200 | [diff] [blame] | 343 | return -EINVAL; |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 344 | skp = smk_find_entry(cp); |
| 345 | kfree(cp); |
Jarkko Sakkinen | 0e94ae1 | 2011-10-18 21:21:36 +0300 | [diff] [blame] | 346 | if (skp == NULL) |
Jarkko Sakkinen | 398ce07 | 2013-11-28 19:16:46 +0200 | [diff] [blame] | 347 | return -ENOENT; |
Jarkko Sakkinen | 0e94ae1 | 2011-10-18 21:21:36 +0300 | [diff] [blame] | 348 | rule->smk_object = skp->smk_known; |
| 349 | } |
Jarkko Sakkinen | 828716c | 2011-09-08 10:12:01 +0300 | [diff] [blame] | 350 | |
Rafal Krypa | e05b6f9 | 2013-01-10 19:42:00 +0100 | [diff] [blame] | 351 | rule->smk_access1 = smk_perm_from_str(access1); |
| 352 | if (access2) |
| 353 | rule->smk_access2 = smk_perm_from_str(access2); |
| 354 | else |
| 355 | rule->smk_access2 = ~rule->smk_access1; |
Jarkko Sakkinen | 828716c | 2011-09-08 10:12:01 +0300 | [diff] [blame] | 356 | |
Casey Schaufler | 3518721 | 2012-06-18 19:01:36 -0700 | [diff] [blame] | 357 | return 0; |
Jarkko Sakkinen | 828716c | 2011-09-08 10:12:01 +0300 | [diff] [blame] | 358 | } |
| 359 | |
| 360 | /** |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 361 | * smk_parse_rule - parse Smack rule from load string |
| 362 | * @data: string to be parsed whose size is SMK_LOADLEN |
| 363 | * @rule: Smack rule |
| 364 | * @import: if non-zero, import labels |
| 365 | * |
| 366 | * Returns 0 on success, -1 on errors. |
| 367 | */ |
Rafal Krypa | e05b6f9 | 2013-01-10 19:42:00 +0100 | [diff] [blame] | 368 | static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule, |
| 369 | int import) |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 370 | { |
| 371 | int rc; |
| 372 | |
| 373 | rc = smk_fill_rule(data, data + SMK_LABELLEN, |
Rafal Krypa | e05b6f9 | 2013-01-10 19:42:00 +0100 | [diff] [blame] | 374 | data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule, |
| 375 | import, SMK_LABELLEN); |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 376 | return rc; |
| 377 | } |
| 378 | |
| 379 | /** |
| 380 | * smk_parse_long_rule - parse Smack rule from rule string |
| 381 | * @data: string to be parsed, null terminated |
Rafal Krypa | e05b6f9 | 2013-01-10 19:42:00 +0100 | [diff] [blame] | 382 | * @rule: Will be filled with Smack parsed rule |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 383 | * @import: if non-zero, import labels |
Rafal Krypa | 10289b0 | 2013-08-09 11:47:07 +0200 | [diff] [blame] | 384 | * @tokens: numer of substrings expected in data |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 385 | * |
Rafal Krypa | 10289b0 | 2013-08-09 11:47:07 +0200 | [diff] [blame] | 386 | * Returns number of processed bytes on success, -1 on failure. |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 387 | */ |
Rafal Krypa | 10289b0 | 2013-08-09 11:47:07 +0200 | [diff] [blame] | 388 | static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule, |
| 389 | int import, int tokens) |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 390 | { |
Rafal Krypa | 10289b0 | 2013-08-09 11:47:07 +0200 | [diff] [blame] | 391 | ssize_t cnt = 0; |
| 392 | char *tok[4]; |
Jarkko Sakkinen | 398ce07 | 2013-11-28 19:16:46 +0200 | [diff] [blame] | 393 | int rc; |
Rafal Krypa | 10289b0 | 2013-08-09 11:47:07 +0200 | [diff] [blame] | 394 | int i; |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 395 | |
Rafal Krypa | 10289b0 | 2013-08-09 11:47:07 +0200 | [diff] [blame] | 396 | /* |
| 397 | * Parsing the rule in-place, filling all white-spaces with '\0' |
| 398 | */ |
| 399 | for (i = 0; i < tokens; ++i) { |
| 400 | while (isspace(data[cnt])) |
| 401 | data[cnt++] = '\0'; |
Alan Cox | 3b9fc37 | 2012-07-26 14:47:11 -0700 | [diff] [blame] | 402 | |
Rafal Krypa | 10289b0 | 2013-08-09 11:47:07 +0200 | [diff] [blame] | 403 | if (data[cnt] == '\0') |
| 404 | /* Unexpected end of data */ |
| 405 | return -1; |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 406 | |
Rafal Krypa | 10289b0 | 2013-08-09 11:47:07 +0200 | [diff] [blame] | 407 | tok[i] = data + cnt; |
| 408 | |
| 409 | while (data[cnt] && !isspace(data[cnt])) |
| 410 | ++cnt; |
Rafal Krypa | e05b6f9 | 2013-01-10 19:42:00 +0100 | [diff] [blame] | 411 | } |
Rafal Krypa | 10289b0 | 2013-08-09 11:47:07 +0200 | [diff] [blame] | 412 | while (isspace(data[cnt])) |
| 413 | data[cnt++] = '\0'; |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 414 | |
Rafal Krypa | 10289b0 | 2013-08-09 11:47:07 +0200 | [diff] [blame] | 415 | while (i < 4) |
| 416 | tok[i++] = NULL; |
| 417 | |
Jarkko Sakkinen | 398ce07 | 2013-11-28 19:16:46 +0200 | [diff] [blame] | 418 | rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0); |
| 419 | return rc == 0 ? cnt : rc; |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 420 | } |
| 421 | |
| 422 | #define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */ |
| 423 | #define SMK_LONG_FMT 1 /* Variable long label format */ |
Rafal Krypa | e05b6f9 | 2013-01-10 19:42:00 +0100 | [diff] [blame] | 424 | #define SMK_CHANGE_FMT 2 /* Rule modification format */ |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 425 | /** |
| 426 | * smk_write_rules_list - write() for any /smack rule file |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 427 | * @file: file pointer, not actually used |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 428 | * @buf: where to get the data from |
| 429 | * @count: bytes sent |
| 430 | * @ppos: where to start - must be 0 |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 431 | * @rule_list: the list of rules to write to |
| 432 | * @rule_lock: lock for the rule list |
Rafal Krypa | e05b6f9 | 2013-01-10 19:42:00 +0100 | [diff] [blame] | 433 | * @format: /smack/load or /smack/load2 or /smack/change-rule format. |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 434 | * |
| 435 | * Get one smack access rule from above. |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 436 | * The format for SMK_LONG_FMT is: |
| 437 | * "subject<whitespace>object<whitespace>access[<whitespace>...]" |
| 438 | * The format for SMK_FIXED24_FMT is exactly: |
| 439 | * "subject object rwxat" |
Rafal Krypa | e05b6f9 | 2013-01-10 19:42:00 +0100 | [diff] [blame] | 440 | * The format for SMK_CHANGE_FMT is: |
| 441 | * "subject<whitespace>object<whitespace> |
| 442 | * acc_enable<whitespace>acc_disable[<whitespace>...]" |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 443 | */ |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 444 | static ssize_t smk_write_rules_list(struct file *file, const char __user *buf, |
| 445 | size_t count, loff_t *ppos, |
| 446 | struct list_head *rule_list, |
| 447 | struct mutex *rule_lock, int format) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 448 | { |
Tomasz Stanislawski | 470043b | 2013-06-06 09:30:50 +0200 | [diff] [blame] | 449 | struct smack_parsed_rule rule; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 450 | char *data; |
Rafal Krypa | 10289b0 | 2013-08-09 11:47:07 +0200 | [diff] [blame] | 451 | int rc; |
| 452 | int trunc = 0; |
| 453 | int tokens; |
| 454 | ssize_t cnt = 0; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 455 | |
| 456 | /* |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 457 | * No partial writes. |
| 458 | * Enough data must be present. |
| 459 | */ |
Jarkko Sakkinen | 5c6d112 | 2010-12-07 13:34:01 +0200 | [diff] [blame] | 460 | if (*ppos != 0) |
| 461 | return -EINVAL; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 462 | |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 463 | if (format == SMK_FIXED24_FMT) { |
| 464 | /* |
| 465 | * Minor hack for backward compatibility |
| 466 | */ |
Casey Schaufler | c0ab6e5 | 2013-10-11 18:06:39 -0700 | [diff] [blame] | 467 | if (count < SMK_OLOADLEN || count > SMK_LOADLEN) |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 468 | return -EINVAL; |
Rafal Krypa | 10289b0 | 2013-08-09 11:47:07 +0200 | [diff] [blame] | 469 | } else { |
| 470 | if (count >= PAGE_SIZE) { |
| 471 | count = PAGE_SIZE - 1; |
| 472 | trunc = 1; |
| 473 | } |
| 474 | } |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 475 | |
Rafal Krypa | 10289b0 | 2013-08-09 11:47:07 +0200 | [diff] [blame] | 476 | data = kmalloc(count + 1, GFP_KERNEL); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 477 | if (data == NULL) |
| 478 | return -ENOMEM; |
| 479 | |
| 480 | if (copy_from_user(data, buf, count) != 0) { |
| 481 | rc = -EFAULT; |
| 482 | goto out; |
| 483 | } |
| 484 | |
Rafal Krypa | 10289b0 | 2013-08-09 11:47:07 +0200 | [diff] [blame] | 485 | /* |
| 486 | * In case of parsing only part of user buf, |
| 487 | * avoid having partial rule at the data buffer |
| 488 | */ |
| 489 | if (trunc) { |
| 490 | while (count > 0 && (data[count - 1] != '\n')) |
| 491 | --count; |
| 492 | if (count == 0) { |
| 493 | rc = -EINVAL; |
Tomasz Stanislawski | 470043b | 2013-06-06 09:30:50 +0200 | [diff] [blame] | 494 | goto out; |
Rafal Krypa | 10289b0 | 2013-08-09 11:47:07 +0200 | [diff] [blame] | 495 | } |
| 496 | } |
| 497 | |
| 498 | data[count] = '\0'; |
| 499 | tokens = (format == SMK_CHANGE_FMT ? 4 : 3); |
| 500 | while (cnt < count) { |
| 501 | if (format == SMK_FIXED24_FMT) { |
| 502 | rc = smk_parse_rule(data, &rule, 1); |
| 503 | if (rc != 0) { |
| 504 | rc = -EINVAL; |
| 505 | goto out; |
| 506 | } |
| 507 | cnt = count; |
| 508 | } else { |
| 509 | rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens); |
| 510 | if (rc <= 0) { |
| 511 | rc = -EINVAL; |
| 512 | goto out; |
| 513 | } |
| 514 | cnt += rc; |
| 515 | } |
| 516 | |
| 517 | if (rule_list == NULL) |
| 518 | rc = smk_set_access(&rule, &rule.smk_subject->smk_rules, |
| 519 | &rule.smk_subject->smk_rules_lock, 1); |
| 520 | else |
| 521 | rc = smk_set_access(&rule, rule_list, rule_lock, 0); |
| 522 | |
| 523 | if (rc) |
Tomasz Stanislawski | 470043b | 2013-06-06 09:30:50 +0200 | [diff] [blame] | 524 | goto out; |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 525 | } |
| 526 | |
Rafal Krypa | 10289b0 | 2013-08-09 11:47:07 +0200 | [diff] [blame] | 527 | rc = cnt; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 528 | out: |
| 529 | kfree(data); |
| 530 | return rc; |
| 531 | } |
| 532 | |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 533 | /* |
Casey Schaufler | 4080956 | 2011-11-10 15:02:22 -0800 | [diff] [blame] | 534 | * Core logic for smackfs seq list operations. |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 535 | */ |
| 536 | |
Casey Schaufler | 4080956 | 2011-11-10 15:02:22 -0800 | [diff] [blame] | 537 | static void *smk_seq_start(struct seq_file *s, loff_t *pos, |
| 538 | struct list_head *head) |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 539 | { |
Casey Schaufler | 272cd7a | 2011-09-20 12:24:36 -0700 | [diff] [blame] | 540 | struct list_head *list; |
| 541 | |
| 542 | /* |
| 543 | * This is 0 the first time through. |
| 544 | */ |
| 545 | if (s->index == 0) |
Casey Schaufler | 4080956 | 2011-11-10 15:02:22 -0800 | [diff] [blame] | 546 | s->private = head; |
Casey Schaufler | 272cd7a | 2011-09-20 12:24:36 -0700 | [diff] [blame] | 547 | |
| 548 | if (s->private == NULL) |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 549 | return NULL; |
Casey Schaufler | 272cd7a | 2011-09-20 12:24:36 -0700 | [diff] [blame] | 550 | |
| 551 | list = s->private; |
| 552 | if (list_empty(list)) |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 553 | return NULL; |
Casey Schaufler | 272cd7a | 2011-09-20 12:24:36 -0700 | [diff] [blame] | 554 | |
| 555 | if (s->index == 0) |
| 556 | return list->next; |
| 557 | return list; |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 558 | } |
| 559 | |
Casey Schaufler | 4080956 | 2011-11-10 15:02:22 -0800 | [diff] [blame] | 560 | static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos, |
| 561 | struct list_head *head) |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 562 | { |
| 563 | struct list_head *list = v; |
| 564 | |
Casey Schaufler | 4080956 | 2011-11-10 15:02:22 -0800 | [diff] [blame] | 565 | if (list_is_last(list, head)) { |
Casey Schaufler | 272cd7a | 2011-09-20 12:24:36 -0700 | [diff] [blame] | 566 | s->private = NULL; |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 567 | return NULL; |
| 568 | } |
Casey Schaufler | 272cd7a | 2011-09-20 12:24:36 -0700 | [diff] [blame] | 569 | s->private = list->next; |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 570 | return list->next; |
| 571 | } |
| 572 | |
Casey Schaufler | 4080956 | 2011-11-10 15:02:22 -0800 | [diff] [blame] | 573 | static void smk_seq_stop(struct seq_file *s, void *v) |
| 574 | { |
| 575 | /* No-op */ |
| 576 | } |
| 577 | |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 578 | static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max) |
Casey Schaufler | 4080956 | 2011-11-10 15:02:22 -0800 | [diff] [blame] | 579 | { |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 580 | /* |
| 581 | * Don't show any rules with label names too long for |
| 582 | * interface file (/smack/load or /smack/load2) |
| 583 | * because you should expect to be able to write |
| 584 | * anything you read back. |
| 585 | */ |
Casey Schaufler | 2f823ff | 2013-05-22 18:43:03 -0700 | [diff] [blame] | 586 | if (strlen(srp->smk_subject->smk_known) >= max || |
| 587 | strlen(srp->smk_object) >= max) |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 588 | return; |
Casey Schaufler | 4080956 | 2011-11-10 15:02:22 -0800 | [diff] [blame] | 589 | |
Rafal Krypa | 65ee7f4 | 2012-07-09 19:36:34 +0200 | [diff] [blame] | 590 | if (srp->smk_access == 0) |
| 591 | return; |
| 592 | |
Casey Schaufler | 2f823ff | 2013-05-22 18:43:03 -0700 | [diff] [blame] | 593 | seq_printf(s, "%s %s", srp->smk_subject->smk_known, srp->smk_object); |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 594 | |
| 595 | seq_putc(s, ' '); |
| 596 | |
| 597 | if (srp->smk_access & MAY_READ) |
| 598 | seq_putc(s, 'r'); |
| 599 | if (srp->smk_access & MAY_WRITE) |
| 600 | seq_putc(s, 'w'); |
| 601 | if (srp->smk_access & MAY_EXEC) |
| 602 | seq_putc(s, 'x'); |
| 603 | if (srp->smk_access & MAY_APPEND) |
| 604 | seq_putc(s, 'a'); |
| 605 | if (srp->smk_access & MAY_TRANSMUTE) |
| 606 | seq_putc(s, 't'); |
Casey Schaufler | c0ab6e5 | 2013-10-11 18:06:39 -0700 | [diff] [blame] | 607 | if (srp->smk_access & MAY_LOCK) |
| 608 | seq_putc(s, 'l'); |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 609 | |
| 610 | seq_putc(s, '\n'); |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 611 | } |
| 612 | |
| 613 | /* |
| 614 | * Seq_file read operations for /smack/load |
| 615 | */ |
| 616 | |
| 617 | static void *load2_seq_start(struct seq_file *s, loff_t *pos) |
| 618 | { |
| 619 | return smk_seq_start(s, pos, &smack_rule_list); |
| 620 | } |
| 621 | |
| 622 | static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos) |
| 623 | { |
| 624 | return smk_seq_next(s, v, pos, &smack_rule_list); |
| 625 | } |
| 626 | |
| 627 | static int load_seq_show(struct seq_file *s, void *v) |
| 628 | { |
| 629 | struct list_head *list = v; |
| 630 | struct smack_master_list *smlp = |
| 631 | list_entry(list, struct smack_master_list, list); |
| 632 | |
| 633 | smk_rule_show(s, smlp->smk_rule, SMK_LABELLEN); |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 634 | |
| 635 | return 0; |
| 636 | } |
| 637 | |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 638 | static const struct seq_operations load_seq_ops = { |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 639 | .start = load2_seq_start, |
| 640 | .next = load2_seq_next, |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 641 | .show = load_seq_show, |
Casey Schaufler | 4080956 | 2011-11-10 15:02:22 -0800 | [diff] [blame] | 642 | .stop = smk_seq_stop, |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 643 | }; |
| 644 | |
| 645 | /** |
| 646 | * smk_open_load - open() for /smack/load |
| 647 | * @inode: inode structure representing file |
| 648 | * @file: "load" file pointer |
| 649 | * |
| 650 | * For reading, use load_seq_* seq_file reading operations. |
| 651 | */ |
| 652 | static int smk_open_load(struct inode *inode, struct file *file) |
| 653 | { |
| 654 | return seq_open(file, &load_seq_ops); |
| 655 | } |
| 656 | |
| 657 | /** |
| 658 | * smk_write_load - write() for /smack/load |
| 659 | * @file: file pointer, not actually used |
| 660 | * @buf: where to get the data from |
| 661 | * @count: bytes sent |
| 662 | * @ppos: where to start - must be 0 |
| 663 | * |
| 664 | */ |
| 665 | static ssize_t smk_write_load(struct file *file, const char __user *buf, |
| 666 | size_t count, loff_t *ppos) |
| 667 | { |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 668 | /* |
| 669 | * Must have privilege. |
| 670 | * No partial writes. |
| 671 | * Enough data must be present. |
| 672 | */ |
Casey Schaufler | 1880eff | 2012-06-05 15:28:30 -0700 | [diff] [blame] | 673 | if (!smack_privileged(CAP_MAC_ADMIN)) |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 674 | return -EPERM; |
| 675 | |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 676 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, |
| 677 | SMK_FIXED24_FMT); |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 678 | } |
| 679 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 680 | static const struct file_operations smk_load_ops = { |
| 681 | .open = smk_open_load, |
| 682 | .read = seq_read, |
| 683 | .llseek = seq_lseek, |
| 684 | .write = smk_write_load, |
Ahmed S. Darwish | cb622bb | 2008-03-24 12:29:49 -0700 | [diff] [blame] | 685 | .release = seq_release, |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 686 | }; |
| 687 | |
| 688 | /** |
| 689 | * smk_cipso_doi - initialize the CIPSO domain |
| 690 | */ |
Casey Schaufler | 30aa4fa | 2008-04-28 02:13:43 -0700 | [diff] [blame] | 691 | static void smk_cipso_doi(void) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 692 | { |
| 693 | int rc; |
| 694 | struct cipso_v4_doi *doip; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 695 | struct netlbl_audit nai; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 696 | |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 697 | smk_netlabel_audit_set(&nai); |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 698 | |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 699 | rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 700 | if (rc != 0) |
| 701 | printk(KERN_WARNING "%s:%d remove rc = %d\n", |
| 702 | __func__, __LINE__, rc); |
| 703 | |
| 704 | doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL); |
| 705 | if (doip == NULL) |
| 706 | panic("smack: Failed to initialize cipso DOI.\n"); |
| 707 | doip->map.std = NULL; |
| 708 | doip->doi = smk_cipso_doi_value; |
| 709 | doip->type = CIPSO_V4_MAP_PASS; |
| 710 | doip->tags[0] = CIPSO_V4_TAG_RBITMAP; |
| 711 | for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++) |
| 712 | doip->tags[rc] = CIPSO_V4_TAG_INVALID; |
| 713 | |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 714 | rc = netlbl_cfg_cipsov4_add(doip, &nai); |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 715 | if (rc != 0) { |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 716 | printk(KERN_WARNING "%s:%d cipso add rc = %d\n", |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 717 | __func__, __LINE__, rc); |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 718 | kfree(doip); |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 719 | return; |
| 720 | } |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 721 | rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai); |
Paul Moore | 6c2e8ac | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 722 | if (rc != 0) { |
| 723 | printk(KERN_WARNING "%s:%d map add rc = %d\n", |
| 724 | __func__, __LINE__, rc); |
| 725 | kfree(doip); |
| 726 | return; |
Paul Moore | b1edeb1 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 727 | } |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 728 | } |
| 729 | |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 730 | /** |
| 731 | * smk_unlbl_ambient - initialize the unlabeled domain |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 732 | * @oldambient: previous domain string |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 733 | */ |
Casey Schaufler | 30aa4fa | 2008-04-28 02:13:43 -0700 | [diff] [blame] | 734 | static void smk_unlbl_ambient(char *oldambient) |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 735 | { |
| 736 | int rc; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 737 | struct netlbl_audit nai; |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 738 | |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 739 | smk_netlabel_audit_set(&nai); |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 740 | |
| 741 | if (oldambient != NULL) { |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 742 | rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai); |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 743 | if (rc != 0) |
| 744 | printk(KERN_WARNING "%s:%d remove rc = %d\n", |
| 745 | __func__, __LINE__, rc); |
| 746 | } |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 747 | if (smack_net_ambient == NULL) |
Casey Schaufler | 2f823ff | 2013-05-22 18:43:03 -0700 | [diff] [blame] | 748 | smack_net_ambient = &smack_known_floor; |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 749 | |
Casey Schaufler | 2f823ff | 2013-05-22 18:43:03 -0700 | [diff] [blame] | 750 | rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET, |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 751 | NULL, NULL, &nai); |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 752 | if (rc != 0) |
| 753 | printk(KERN_WARNING "%s:%d add rc = %d\n", |
| 754 | __func__, __LINE__, rc); |
| 755 | } |
| 756 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 757 | /* |
| 758 | * Seq_file read operations for /smack/cipso |
| 759 | */ |
| 760 | |
| 761 | static void *cipso_seq_start(struct seq_file *s, loff_t *pos) |
| 762 | { |
Casey Schaufler | 4080956 | 2011-11-10 15:02:22 -0800 | [diff] [blame] | 763 | return smk_seq_start(s, pos, &smack_known_list); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 764 | } |
| 765 | |
| 766 | static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) |
| 767 | { |
Casey Schaufler | 4080956 | 2011-11-10 15:02:22 -0800 | [diff] [blame] | 768 | return smk_seq_next(s, v, pos, &smack_known_list); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 769 | } |
| 770 | |
| 771 | /* |
| 772 | * Print cipso labels in format: |
| 773 | * label level[/cat[,cat]] |
| 774 | */ |
| 775 | static int cipso_seq_show(struct seq_file *s, void *v) |
| 776 | { |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 777 | struct list_head *list = v; |
| 778 | struct smack_known *skp = |
| 779 | list_entry(list, struct smack_known, list); |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 780 | struct netlbl_lsm_secattr_catmap *cmp = skp->smk_netlabel.attr.mls.cat; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 781 | char sep = '/'; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 782 | int i; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 783 | |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 784 | /* |
| 785 | * Don't show a label that could not have been set using |
| 786 | * /smack/cipso. This is in support of the notion that |
| 787 | * anything read from /smack/cipso ought to be writeable |
| 788 | * to /smack/cipso. |
| 789 | * |
| 790 | * /smack/cipso2 should be used instead. |
| 791 | */ |
| 792 | if (strlen(skp->smk_known) >= SMK_LABELLEN) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 793 | return 0; |
| 794 | |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 795 | seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 796 | |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 797 | for (i = netlbl_secattr_catmap_walk(cmp, 0); i >= 0; |
| 798 | i = netlbl_secattr_catmap_walk(cmp, i + 1)) { |
| 799 | seq_printf(s, "%c%d", sep, i); |
| 800 | sep = ','; |
| 801 | } |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 802 | |
| 803 | seq_putc(s, '\n'); |
| 804 | |
| 805 | return 0; |
| 806 | } |
| 807 | |
James Morris | 88e9d34 | 2009-09-22 16:43:43 -0700 | [diff] [blame] | 808 | static const struct seq_operations cipso_seq_ops = { |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 809 | .start = cipso_seq_start, |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 810 | .next = cipso_seq_next, |
| 811 | .show = cipso_seq_show, |
Casey Schaufler | 4080956 | 2011-11-10 15:02:22 -0800 | [diff] [blame] | 812 | .stop = smk_seq_stop, |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 813 | }; |
| 814 | |
| 815 | /** |
| 816 | * smk_open_cipso - open() for /smack/cipso |
| 817 | * @inode: inode structure representing file |
| 818 | * @file: "cipso" file pointer |
| 819 | * |
| 820 | * Connect our cipso_seq_* operations with /smack/cipso |
| 821 | * file_operations |
| 822 | */ |
| 823 | static int smk_open_cipso(struct inode *inode, struct file *file) |
| 824 | { |
| 825 | return seq_open(file, &cipso_seq_ops); |
| 826 | } |
| 827 | |
| 828 | /** |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 829 | * smk_set_cipso - do the work for write() for cipso and cipso2 |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 830 | * @file: file pointer, not actually used |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 831 | * @buf: where to get the data from |
| 832 | * @count: bytes sent |
| 833 | * @ppos: where to start |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 834 | * @format: /smack/cipso or /smack/cipso2 |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 835 | * |
| 836 | * Accepts only one cipso rule per write call. |
| 837 | * Returns number of bytes written or error code, as appropriate |
| 838 | */ |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 839 | static ssize_t smk_set_cipso(struct file *file, const char __user *buf, |
| 840 | size_t count, loff_t *ppos, int format) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 841 | { |
| 842 | struct smack_known *skp; |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 843 | struct netlbl_lsm_secattr ncats; |
| 844 | char mapcatset[SMK_CIPSOLEN]; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 845 | int maplevel; |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 846 | unsigned int cat; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 847 | int catlen; |
| 848 | ssize_t rc = -EINVAL; |
| 849 | char *data = NULL; |
| 850 | char *rule; |
| 851 | int ret; |
| 852 | int i; |
| 853 | |
| 854 | /* |
| 855 | * Must have privilege. |
| 856 | * No partial writes. |
| 857 | * Enough data must be present. |
| 858 | */ |
Casey Schaufler | 1880eff | 2012-06-05 15:28:30 -0700 | [diff] [blame] | 859 | if (!smack_privileged(CAP_MAC_ADMIN)) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 860 | return -EPERM; |
| 861 | if (*ppos != 0) |
| 862 | return -EINVAL; |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 863 | if (format == SMK_FIXED24_FMT && |
| 864 | (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX)) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 865 | return -EINVAL; |
| 866 | |
| 867 | data = kzalloc(count + 1, GFP_KERNEL); |
| 868 | if (data == NULL) |
| 869 | return -ENOMEM; |
| 870 | |
| 871 | if (copy_from_user(data, buf, count) != 0) { |
| 872 | rc = -EFAULT; |
| 873 | goto unlockedout; |
| 874 | } |
| 875 | |
| 876 | data[count] = '\0'; |
| 877 | rule = data; |
| 878 | /* |
| 879 | * Only allow one writer at a time. Writes should be |
| 880 | * quite rare and small in any case. |
| 881 | */ |
| 882 | mutex_lock(&smack_cipso_lock); |
| 883 | |
| 884 | skp = smk_import_entry(rule, 0); |
| 885 | if (skp == NULL) |
| 886 | goto out; |
| 887 | |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 888 | if (format == SMK_FIXED24_FMT) |
| 889 | rule += SMK_LABELLEN; |
| 890 | else |
Passion,Zhao | 0fcfee6 | 2013-06-03 11:42:24 +0800 | [diff] [blame] | 891 | rule += strlen(skp->smk_known) + 1; |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 892 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 893 | ret = sscanf(rule, "%d", &maplevel); |
| 894 | if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL) |
| 895 | goto out; |
| 896 | |
| 897 | rule += SMK_DIGITLEN; |
| 898 | ret = sscanf(rule, "%d", &catlen); |
| 899 | if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM) |
| 900 | goto out; |
| 901 | |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 902 | if (format == SMK_FIXED24_FMT && |
| 903 | count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 904 | goto out; |
| 905 | |
| 906 | memset(mapcatset, 0, sizeof(mapcatset)); |
| 907 | |
| 908 | for (i = 0; i < catlen; i++) { |
| 909 | rule += SMK_DIGITLEN; |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 910 | ret = sscanf(rule, "%u", &cat); |
Casey Schaufler | 677264e | 2013-06-28 13:47:07 -0700 | [diff] [blame] | 911 | if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 912 | goto out; |
| 913 | |
| 914 | smack_catset_bit(cat, mapcatset); |
| 915 | } |
| 916 | |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 917 | rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN); |
| 918 | if (rc >= 0) { |
| 919 | netlbl_secattr_catmap_free(skp->smk_netlabel.attr.mls.cat); |
| 920 | skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat; |
| 921 | skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl; |
| 922 | rc = count; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 923 | } |
| 924 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 925 | out: |
| 926 | mutex_unlock(&smack_cipso_lock); |
| 927 | unlockedout: |
| 928 | kfree(data); |
| 929 | return rc; |
| 930 | } |
| 931 | |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 932 | /** |
| 933 | * smk_write_cipso - write() for /smack/cipso |
| 934 | * @file: file pointer, not actually used |
| 935 | * @buf: where to get the data from |
| 936 | * @count: bytes sent |
| 937 | * @ppos: where to start |
| 938 | * |
| 939 | * Accepts only one cipso rule per write call. |
| 940 | * Returns number of bytes written or error code, as appropriate |
| 941 | */ |
| 942 | static ssize_t smk_write_cipso(struct file *file, const char __user *buf, |
| 943 | size_t count, loff_t *ppos) |
| 944 | { |
| 945 | return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT); |
| 946 | } |
| 947 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 948 | static const struct file_operations smk_cipso_ops = { |
| 949 | .open = smk_open_cipso, |
| 950 | .read = seq_read, |
| 951 | .llseek = seq_lseek, |
| 952 | .write = smk_write_cipso, |
| 953 | .release = seq_release, |
| 954 | }; |
| 955 | |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 956 | /* |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 957 | * Seq_file read operations for /smack/cipso2 |
| 958 | */ |
| 959 | |
| 960 | /* |
| 961 | * Print cipso labels in format: |
| 962 | * label level[/cat[,cat]] |
| 963 | */ |
| 964 | static int cipso2_seq_show(struct seq_file *s, void *v) |
| 965 | { |
| 966 | struct list_head *list = v; |
| 967 | struct smack_known *skp = |
| 968 | list_entry(list, struct smack_known, list); |
| 969 | struct netlbl_lsm_secattr_catmap *cmp = skp->smk_netlabel.attr.mls.cat; |
| 970 | char sep = '/'; |
| 971 | int i; |
| 972 | |
| 973 | seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); |
| 974 | |
| 975 | for (i = netlbl_secattr_catmap_walk(cmp, 0); i >= 0; |
| 976 | i = netlbl_secattr_catmap_walk(cmp, i + 1)) { |
| 977 | seq_printf(s, "%c%d", sep, i); |
| 978 | sep = ','; |
| 979 | } |
| 980 | |
| 981 | seq_putc(s, '\n'); |
| 982 | |
| 983 | return 0; |
| 984 | } |
| 985 | |
| 986 | static const struct seq_operations cipso2_seq_ops = { |
| 987 | .start = cipso_seq_start, |
| 988 | .next = cipso_seq_next, |
| 989 | .show = cipso2_seq_show, |
| 990 | .stop = smk_seq_stop, |
| 991 | }; |
| 992 | |
| 993 | /** |
| 994 | * smk_open_cipso2 - open() for /smack/cipso2 |
| 995 | * @inode: inode structure representing file |
| 996 | * @file: "cipso2" file pointer |
| 997 | * |
| 998 | * Connect our cipso_seq_* operations with /smack/cipso2 |
| 999 | * file_operations |
| 1000 | */ |
| 1001 | static int smk_open_cipso2(struct inode *inode, struct file *file) |
| 1002 | { |
| 1003 | return seq_open(file, &cipso2_seq_ops); |
| 1004 | } |
| 1005 | |
| 1006 | /** |
| 1007 | * smk_write_cipso2 - write() for /smack/cipso2 |
| 1008 | * @file: file pointer, not actually used |
| 1009 | * @buf: where to get the data from |
| 1010 | * @count: bytes sent |
| 1011 | * @ppos: where to start |
| 1012 | * |
| 1013 | * Accepts only one cipso rule per write call. |
| 1014 | * Returns number of bytes written or error code, as appropriate |
| 1015 | */ |
| 1016 | static ssize_t smk_write_cipso2(struct file *file, const char __user *buf, |
| 1017 | size_t count, loff_t *ppos) |
| 1018 | { |
| 1019 | return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT); |
| 1020 | } |
| 1021 | |
| 1022 | static const struct file_operations smk_cipso2_ops = { |
| 1023 | .open = smk_open_cipso2, |
| 1024 | .read = seq_read, |
| 1025 | .llseek = seq_lseek, |
| 1026 | .write = smk_write_cipso2, |
| 1027 | .release = seq_release, |
| 1028 | }; |
| 1029 | |
| 1030 | /* |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1031 | * Seq_file read operations for /smack/netlabel |
| 1032 | */ |
| 1033 | |
| 1034 | static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos) |
| 1035 | { |
Casey Schaufler | 4080956 | 2011-11-10 15:02:22 -0800 | [diff] [blame] | 1036 | return smk_seq_start(s, pos, &smk_netlbladdr_list); |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1037 | } |
| 1038 | |
| 1039 | static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos) |
| 1040 | { |
Casey Schaufler | 4080956 | 2011-11-10 15:02:22 -0800 | [diff] [blame] | 1041 | return smk_seq_next(s, v, pos, &smk_netlbladdr_list); |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1042 | } |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1043 | #define BEBITS (sizeof(__be32) * 8) |
| 1044 | |
| 1045 | /* |
| 1046 | * Print host/label pairs |
| 1047 | */ |
| 1048 | static int netlbladdr_seq_show(struct seq_file *s, void *v) |
| 1049 | { |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 1050 | struct list_head *list = v; |
| 1051 | struct smk_netlbladdr *skp = |
| 1052 | list_entry(list, struct smk_netlbladdr, list); |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1053 | unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr; |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 1054 | int maskn; |
| 1055 | u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr); |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1056 | |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 1057 | for (maskn = 0; temp_mask; temp_mask <<= 1, maskn++); |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1058 | |
| 1059 | seq_printf(s, "%u.%u.%u.%u/%d %s\n", |
| 1060 | hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label); |
| 1061 | |
| 1062 | return 0; |
| 1063 | } |
| 1064 | |
James Morris | 88e9d34 | 2009-09-22 16:43:43 -0700 | [diff] [blame] | 1065 | static const struct seq_operations netlbladdr_seq_ops = { |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1066 | .start = netlbladdr_seq_start, |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1067 | .next = netlbladdr_seq_next, |
| 1068 | .show = netlbladdr_seq_show, |
Casey Schaufler | 4080956 | 2011-11-10 15:02:22 -0800 | [diff] [blame] | 1069 | .stop = smk_seq_stop, |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1070 | }; |
| 1071 | |
| 1072 | /** |
| 1073 | * smk_open_netlbladdr - open() for /smack/netlabel |
| 1074 | * @inode: inode structure representing file |
| 1075 | * @file: "netlabel" file pointer |
| 1076 | * |
| 1077 | * Connect our netlbladdr_seq_* operations with /smack/netlabel |
| 1078 | * file_operations |
| 1079 | */ |
| 1080 | static int smk_open_netlbladdr(struct inode *inode, struct file *file) |
| 1081 | { |
| 1082 | return seq_open(file, &netlbladdr_seq_ops); |
| 1083 | } |
| 1084 | |
| 1085 | /** |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 1086 | * smk_netlbladdr_insert |
| 1087 | * @new : netlabel to insert |
| 1088 | * |
| 1089 | * This helper insert netlabel in the smack_netlbladdrs list |
| 1090 | * sorted by netmask length (longest to smallest) |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 1091 | * locked by &smk_netlbladdr_lock in smk_write_netlbladdr |
| 1092 | * |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 1093 | */ |
| 1094 | static void smk_netlbladdr_insert(struct smk_netlbladdr *new) |
| 1095 | { |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 1096 | struct smk_netlbladdr *m, *m_next; |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 1097 | |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 1098 | if (list_empty(&smk_netlbladdr_list)) { |
| 1099 | list_add_rcu(&new->list, &smk_netlbladdr_list); |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 1100 | return; |
| 1101 | } |
| 1102 | |
Jiri Pirko | 05725f7 | 2009-04-14 20:17:16 +0200 | [diff] [blame] | 1103 | m = list_entry_rcu(smk_netlbladdr_list.next, |
| 1104 | struct smk_netlbladdr, list); |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 1105 | |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 1106 | /* the comparison '>' is a bit hacky, but works */ |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 1107 | if (new->smk_mask.s_addr > m->smk_mask.s_addr) { |
| 1108 | list_add_rcu(&new->list, &smk_netlbladdr_list); |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 1109 | return; |
| 1110 | } |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 1111 | |
| 1112 | list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) { |
| 1113 | if (list_is_last(&m->list, &smk_netlbladdr_list)) { |
| 1114 | list_add_rcu(&new->list, &m->list); |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 1115 | return; |
| 1116 | } |
Jiri Pirko | 05725f7 | 2009-04-14 20:17:16 +0200 | [diff] [blame] | 1117 | m_next = list_entry_rcu(m->list.next, |
| 1118 | struct smk_netlbladdr, list); |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 1119 | if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) { |
| 1120 | list_add_rcu(&new->list, &m->list); |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 1121 | return; |
| 1122 | } |
| 1123 | } |
| 1124 | } |
| 1125 | |
| 1126 | |
| 1127 | /** |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1128 | * smk_write_netlbladdr - write() for /smack/netlabel |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 1129 | * @file: file pointer, not actually used |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1130 | * @buf: where to get the data from |
| 1131 | * @count: bytes sent |
| 1132 | * @ppos: where to start |
| 1133 | * |
| 1134 | * Accepts only one netlbladdr per write call. |
| 1135 | * Returns number of bytes written or error code, as appropriate |
| 1136 | */ |
| 1137 | static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf, |
| 1138 | size_t count, loff_t *ppos) |
| 1139 | { |
| 1140 | struct smk_netlbladdr *skp; |
| 1141 | struct sockaddr_in newname; |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1142 | char *smack; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1143 | char *sp; |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1144 | char *data; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1145 | char *host = (char *)&newname.sin_addr.s_addr; |
| 1146 | int rc; |
| 1147 | struct netlbl_audit audit_info; |
| 1148 | struct in_addr mask; |
| 1149 | unsigned int m; |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 1150 | int found; |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 1151 | u32 mask_bits = (1<<31); |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1152 | __be32 nsa; |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 1153 | u32 temp_mask; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1154 | |
| 1155 | /* |
| 1156 | * Must have privilege. |
| 1157 | * No partial writes. |
| 1158 | * Enough data must be present. |
| 1159 | * "<addr/mask, as a.b.c.d/e><space><label>" |
| 1160 | * "<addr, as a.b.c.d><space><label>" |
| 1161 | */ |
Casey Schaufler | 1880eff | 2012-06-05 15:28:30 -0700 | [diff] [blame] | 1162 | if (!smack_privileged(CAP_MAC_ADMIN)) |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1163 | return -EPERM; |
| 1164 | if (*ppos != 0) |
| 1165 | return -EINVAL; |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1166 | if (count < SMK_NETLBLADDRMIN) |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1167 | return -EINVAL; |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1168 | |
| 1169 | data = kzalloc(count + 1, GFP_KERNEL); |
| 1170 | if (data == NULL) |
| 1171 | return -ENOMEM; |
| 1172 | |
| 1173 | if (copy_from_user(data, buf, count) != 0) { |
| 1174 | rc = -EFAULT; |
| 1175 | goto free_data_out; |
| 1176 | } |
| 1177 | |
| 1178 | smack = kzalloc(count + 1, GFP_KERNEL); |
| 1179 | if (smack == NULL) { |
| 1180 | rc = -ENOMEM; |
| 1181 | goto free_data_out; |
| 1182 | } |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1183 | |
| 1184 | data[count] = '\0'; |
| 1185 | |
| 1186 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s", |
| 1187 | &host[0], &host[1], &host[2], &host[3], &m, smack); |
| 1188 | if (rc != 6) { |
| 1189 | rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s", |
| 1190 | &host[0], &host[1], &host[2], &host[3], smack); |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1191 | if (rc != 5) { |
| 1192 | rc = -EINVAL; |
| 1193 | goto free_out; |
| 1194 | } |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1195 | m = BEBITS; |
| 1196 | } |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1197 | if (m > BEBITS) { |
| 1198 | rc = -EINVAL; |
| 1199 | goto free_out; |
| 1200 | } |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1201 | |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1202 | /* |
| 1203 | * If smack begins with '-', it is an option, don't import it |
| 1204 | */ |
Etienne Basset | 4303154 | 2009-03-27 17:11:01 -0400 | [diff] [blame] | 1205 | if (smack[0] != '-') { |
| 1206 | sp = smk_import(smack, 0); |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1207 | if (sp == NULL) { |
| 1208 | rc = -EINVAL; |
| 1209 | goto free_out; |
| 1210 | } |
Etienne Basset | 4303154 | 2009-03-27 17:11:01 -0400 | [diff] [blame] | 1211 | } else { |
| 1212 | /* check known options */ |
| 1213 | if (strcmp(smack, smack_cipso_option) == 0) |
| 1214 | sp = (char *)smack_cipso_option; |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1215 | else { |
| 1216 | rc = -EINVAL; |
| 1217 | goto free_out; |
| 1218 | } |
Etienne Basset | 4303154 | 2009-03-27 17:11:01 -0400 | [diff] [blame] | 1219 | } |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1220 | |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 1221 | for (temp_mask = 0; m > 0; m--) { |
| 1222 | temp_mask |= mask_bits; |
| 1223 | mask_bits >>= 1; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1224 | } |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 1225 | mask.s_addr = cpu_to_be32(temp_mask); |
| 1226 | |
| 1227 | newname.sin_addr.s_addr &= mask.s_addr; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1228 | /* |
| 1229 | * Only allow one writer at a time. Writes should be |
| 1230 | * quite rare and small in any case. |
| 1231 | */ |
| 1232 | mutex_lock(&smk_netlbladdr_lock); |
| 1233 | |
| 1234 | nsa = newname.sin_addr.s_addr; |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 1235 | /* try to find if the prefix is already in the list */ |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 1236 | found = 0; |
| 1237 | list_for_each_entry_rcu(skp, &smk_netlbladdr_list, list) { |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1238 | if (skp->smk_host.sin_addr.s_addr == nsa && |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 1239 | skp->smk_mask.s_addr == mask.s_addr) { |
| 1240 | found = 1; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1241 | break; |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 1242 | } |
| 1243 | } |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1244 | smk_netlabel_audit_set(&audit_info); |
| 1245 | |
Etienne Basset | 7198e2e | 2009-03-24 20:53:24 +0100 | [diff] [blame] | 1246 | if (found == 0) { |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1247 | skp = kzalloc(sizeof(*skp), GFP_KERNEL); |
| 1248 | if (skp == NULL) |
| 1249 | rc = -ENOMEM; |
| 1250 | else { |
| 1251 | rc = 0; |
| 1252 | skp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr; |
| 1253 | skp->smk_mask.s_addr = mask.s_addr; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1254 | skp->smk_label = sp; |
etienne | 113a0e4 | 2009-03-04 07:33:51 +0100 | [diff] [blame] | 1255 | smk_netlbladdr_insert(skp); |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1256 | } |
| 1257 | } else { |
Etienne Basset | 4303154 | 2009-03-27 17:11:01 -0400 | [diff] [blame] | 1258 | /* we delete the unlabeled entry, only if the previous label |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1259 | * wasn't the special CIPSO option */ |
Etienne Basset | 4303154 | 2009-03-27 17:11:01 -0400 | [diff] [blame] | 1260 | if (skp->smk_label != smack_cipso_option) |
| 1261 | rc = netlbl_cfg_unlbl_static_del(&init_net, NULL, |
| 1262 | &skp->smk_host.sin_addr, &skp->smk_mask, |
| 1263 | PF_INET, &audit_info); |
| 1264 | else |
| 1265 | rc = 0; |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1266 | skp->smk_label = sp; |
| 1267 | } |
| 1268 | |
| 1269 | /* |
| 1270 | * Now tell netlabel about the single label nature of |
| 1271 | * this host so that incoming packets get labeled. |
Etienne Basset | 4303154 | 2009-03-27 17:11:01 -0400 | [diff] [blame] | 1272 | * but only if we didn't get the special CIPSO option |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1273 | */ |
Etienne Basset | 4303154 | 2009-03-27 17:11:01 -0400 | [diff] [blame] | 1274 | if (rc == 0 && sp != smack_cipso_option) |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1275 | rc = netlbl_cfg_unlbl_static_add(&init_net, NULL, |
| 1276 | &skp->smk_host.sin_addr, &skp->smk_mask, PF_INET, |
| 1277 | smack_to_secid(skp->smk_label), &audit_info); |
| 1278 | |
| 1279 | if (rc == 0) |
| 1280 | rc = count; |
| 1281 | |
| 1282 | mutex_unlock(&smk_netlbladdr_lock); |
| 1283 | |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1284 | free_out: |
| 1285 | kfree(smack); |
| 1286 | free_data_out: |
| 1287 | kfree(data); |
| 1288 | |
Casey Schaufler | 6d3dc07 | 2008-12-31 12:54:12 -0500 | [diff] [blame] | 1289 | return rc; |
| 1290 | } |
| 1291 | |
| 1292 | static const struct file_operations smk_netlbladdr_ops = { |
| 1293 | .open = smk_open_netlbladdr, |
| 1294 | .read = seq_read, |
| 1295 | .llseek = seq_lseek, |
| 1296 | .write = smk_write_netlbladdr, |
| 1297 | .release = seq_release, |
| 1298 | }; |
| 1299 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1300 | /** |
| 1301 | * smk_read_doi - read() for /smack/doi |
| 1302 | * @filp: file pointer, not actually used |
| 1303 | * @buf: where to put the result |
| 1304 | * @count: maximum to send along |
| 1305 | * @ppos: where to start |
| 1306 | * |
| 1307 | * Returns number of bytes read or error code, as appropriate |
| 1308 | */ |
| 1309 | static ssize_t smk_read_doi(struct file *filp, char __user *buf, |
| 1310 | size_t count, loff_t *ppos) |
| 1311 | { |
| 1312 | char temp[80]; |
| 1313 | ssize_t rc; |
| 1314 | |
| 1315 | if (*ppos != 0) |
| 1316 | return 0; |
| 1317 | |
| 1318 | sprintf(temp, "%d", smk_cipso_doi_value); |
| 1319 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); |
| 1320 | |
| 1321 | return rc; |
| 1322 | } |
| 1323 | |
| 1324 | /** |
| 1325 | * smk_write_doi - write() for /smack/doi |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 1326 | * @file: file pointer, not actually used |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1327 | * @buf: where to get the data from |
| 1328 | * @count: bytes sent |
| 1329 | * @ppos: where to start |
| 1330 | * |
| 1331 | * Returns number of bytes written or error code, as appropriate |
| 1332 | */ |
| 1333 | static ssize_t smk_write_doi(struct file *file, const char __user *buf, |
| 1334 | size_t count, loff_t *ppos) |
| 1335 | { |
| 1336 | char temp[80]; |
| 1337 | int i; |
| 1338 | |
Casey Schaufler | 1880eff | 2012-06-05 15:28:30 -0700 | [diff] [blame] | 1339 | if (!smack_privileged(CAP_MAC_ADMIN)) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1340 | return -EPERM; |
| 1341 | |
| 1342 | if (count >= sizeof(temp) || count == 0) |
| 1343 | return -EINVAL; |
| 1344 | |
| 1345 | if (copy_from_user(temp, buf, count) != 0) |
| 1346 | return -EFAULT; |
| 1347 | |
| 1348 | temp[count] = '\0'; |
| 1349 | |
| 1350 | if (sscanf(temp, "%d", &i) != 1) |
| 1351 | return -EINVAL; |
| 1352 | |
| 1353 | smk_cipso_doi_value = i; |
| 1354 | |
| 1355 | smk_cipso_doi(); |
| 1356 | |
| 1357 | return count; |
| 1358 | } |
| 1359 | |
| 1360 | static const struct file_operations smk_doi_ops = { |
| 1361 | .read = smk_read_doi, |
| 1362 | .write = smk_write_doi, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1363 | .llseek = default_llseek, |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1364 | }; |
| 1365 | |
| 1366 | /** |
| 1367 | * smk_read_direct - read() for /smack/direct |
| 1368 | * @filp: file pointer, not actually used |
| 1369 | * @buf: where to put the result |
| 1370 | * @count: maximum to send along |
| 1371 | * @ppos: where to start |
| 1372 | * |
| 1373 | * Returns number of bytes read or error code, as appropriate |
| 1374 | */ |
| 1375 | static ssize_t smk_read_direct(struct file *filp, char __user *buf, |
| 1376 | size_t count, loff_t *ppos) |
| 1377 | { |
| 1378 | char temp[80]; |
| 1379 | ssize_t rc; |
| 1380 | |
| 1381 | if (*ppos != 0) |
| 1382 | return 0; |
| 1383 | |
| 1384 | sprintf(temp, "%d", smack_cipso_direct); |
| 1385 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); |
| 1386 | |
| 1387 | return rc; |
| 1388 | } |
| 1389 | |
| 1390 | /** |
| 1391 | * smk_write_direct - write() for /smack/direct |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 1392 | * @file: file pointer, not actually used |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1393 | * @buf: where to get the data from |
| 1394 | * @count: bytes sent |
| 1395 | * @ppos: where to start |
| 1396 | * |
| 1397 | * Returns number of bytes written or error code, as appropriate |
| 1398 | */ |
| 1399 | static ssize_t smk_write_direct(struct file *file, const char __user *buf, |
| 1400 | size_t count, loff_t *ppos) |
| 1401 | { |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1402 | struct smack_known *skp; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1403 | char temp[80]; |
| 1404 | int i; |
| 1405 | |
Casey Schaufler | 1880eff | 2012-06-05 15:28:30 -0700 | [diff] [blame] | 1406 | if (!smack_privileged(CAP_MAC_ADMIN)) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1407 | return -EPERM; |
| 1408 | |
| 1409 | if (count >= sizeof(temp) || count == 0) |
| 1410 | return -EINVAL; |
| 1411 | |
| 1412 | if (copy_from_user(temp, buf, count) != 0) |
| 1413 | return -EFAULT; |
| 1414 | |
| 1415 | temp[count] = '\0'; |
| 1416 | |
| 1417 | if (sscanf(temp, "%d", &i) != 1) |
| 1418 | return -EINVAL; |
| 1419 | |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1420 | /* |
| 1421 | * Don't do anything if the value hasn't actually changed. |
| 1422 | * If it is changing reset the level on entries that were |
| 1423 | * set up to be direct when they were created. |
| 1424 | */ |
| 1425 | if (smack_cipso_direct != i) { |
| 1426 | mutex_lock(&smack_known_lock); |
| 1427 | list_for_each_entry_rcu(skp, &smack_known_list, list) |
| 1428 | if (skp->smk_netlabel.attr.mls.lvl == |
| 1429 | smack_cipso_direct) |
| 1430 | skp->smk_netlabel.attr.mls.lvl = i; |
| 1431 | smack_cipso_direct = i; |
| 1432 | mutex_unlock(&smack_known_lock); |
| 1433 | } |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1434 | |
| 1435 | return count; |
| 1436 | } |
| 1437 | |
| 1438 | static const struct file_operations smk_direct_ops = { |
| 1439 | .read = smk_read_direct, |
| 1440 | .write = smk_write_direct, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1441 | .llseek = default_llseek, |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1442 | }; |
| 1443 | |
| 1444 | /** |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1445 | * smk_read_mapped - read() for /smack/mapped |
| 1446 | * @filp: file pointer, not actually used |
| 1447 | * @buf: where to put the result |
| 1448 | * @count: maximum to send along |
| 1449 | * @ppos: where to start |
| 1450 | * |
| 1451 | * Returns number of bytes read or error code, as appropriate |
| 1452 | */ |
| 1453 | static ssize_t smk_read_mapped(struct file *filp, char __user *buf, |
| 1454 | size_t count, loff_t *ppos) |
| 1455 | { |
| 1456 | char temp[80]; |
| 1457 | ssize_t rc; |
| 1458 | |
| 1459 | if (*ppos != 0) |
| 1460 | return 0; |
| 1461 | |
| 1462 | sprintf(temp, "%d", smack_cipso_mapped); |
| 1463 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); |
| 1464 | |
| 1465 | return rc; |
| 1466 | } |
| 1467 | |
| 1468 | /** |
| 1469 | * smk_write_mapped - write() for /smack/mapped |
| 1470 | * @file: file pointer, not actually used |
| 1471 | * @buf: where to get the data from |
| 1472 | * @count: bytes sent |
| 1473 | * @ppos: where to start |
| 1474 | * |
| 1475 | * Returns number of bytes written or error code, as appropriate |
| 1476 | */ |
| 1477 | static ssize_t smk_write_mapped(struct file *file, const char __user *buf, |
| 1478 | size_t count, loff_t *ppos) |
| 1479 | { |
| 1480 | struct smack_known *skp; |
| 1481 | char temp[80]; |
| 1482 | int i; |
| 1483 | |
Casey Schaufler | 1880eff | 2012-06-05 15:28:30 -0700 | [diff] [blame] | 1484 | if (!smack_privileged(CAP_MAC_ADMIN)) |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1485 | return -EPERM; |
| 1486 | |
| 1487 | if (count >= sizeof(temp) || count == 0) |
| 1488 | return -EINVAL; |
| 1489 | |
| 1490 | if (copy_from_user(temp, buf, count) != 0) |
| 1491 | return -EFAULT; |
| 1492 | |
| 1493 | temp[count] = '\0'; |
| 1494 | |
| 1495 | if (sscanf(temp, "%d", &i) != 1) |
| 1496 | return -EINVAL; |
| 1497 | |
| 1498 | /* |
| 1499 | * Don't do anything if the value hasn't actually changed. |
| 1500 | * If it is changing reset the level on entries that were |
| 1501 | * set up to be mapped when they were created. |
| 1502 | */ |
| 1503 | if (smack_cipso_mapped != i) { |
| 1504 | mutex_lock(&smack_known_lock); |
| 1505 | list_for_each_entry_rcu(skp, &smack_known_list, list) |
| 1506 | if (skp->smk_netlabel.attr.mls.lvl == |
| 1507 | smack_cipso_mapped) |
| 1508 | skp->smk_netlabel.attr.mls.lvl = i; |
| 1509 | smack_cipso_mapped = i; |
| 1510 | mutex_unlock(&smack_known_lock); |
| 1511 | } |
| 1512 | |
| 1513 | return count; |
| 1514 | } |
| 1515 | |
| 1516 | static const struct file_operations smk_mapped_ops = { |
| 1517 | .read = smk_read_mapped, |
| 1518 | .write = smk_write_mapped, |
| 1519 | .llseek = default_llseek, |
| 1520 | }; |
| 1521 | |
| 1522 | /** |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1523 | * smk_read_ambient - read() for /smack/ambient |
| 1524 | * @filp: file pointer, not actually used |
| 1525 | * @buf: where to put the result |
| 1526 | * @cn: maximum to send along |
| 1527 | * @ppos: where to start |
| 1528 | * |
| 1529 | * Returns number of bytes read or error code, as appropriate |
| 1530 | */ |
| 1531 | static ssize_t smk_read_ambient(struct file *filp, char __user *buf, |
| 1532 | size_t cn, loff_t *ppos) |
| 1533 | { |
| 1534 | ssize_t rc; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1535 | int asize; |
| 1536 | |
| 1537 | if (*ppos != 0) |
| 1538 | return 0; |
| 1539 | /* |
| 1540 | * Being careful to avoid a problem in the case where |
| 1541 | * smack_net_ambient gets changed in midstream. |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1542 | */ |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 1543 | mutex_lock(&smack_ambient_lock); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1544 | |
Casey Schaufler | 2f823ff | 2013-05-22 18:43:03 -0700 | [diff] [blame] | 1545 | asize = strlen(smack_net_ambient->smk_known) + 1; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1546 | |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 1547 | if (cn >= asize) |
| 1548 | rc = simple_read_from_buffer(buf, cn, ppos, |
Casey Schaufler | 2f823ff | 2013-05-22 18:43:03 -0700 | [diff] [blame] | 1549 | smack_net_ambient->smk_known, |
| 1550 | asize); |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 1551 | else |
| 1552 | rc = -EINVAL; |
| 1553 | |
| 1554 | mutex_unlock(&smack_ambient_lock); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1555 | |
| 1556 | return rc; |
| 1557 | } |
| 1558 | |
| 1559 | /** |
| 1560 | * smk_write_ambient - write() for /smack/ambient |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 1561 | * @file: file pointer, not actually used |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1562 | * @buf: where to get the data from |
| 1563 | * @count: bytes sent |
| 1564 | * @ppos: where to start |
| 1565 | * |
| 1566 | * Returns number of bytes written or error code, as appropriate |
| 1567 | */ |
| 1568 | static ssize_t smk_write_ambient(struct file *file, const char __user *buf, |
| 1569 | size_t count, loff_t *ppos) |
| 1570 | { |
Casey Schaufler | 2f823ff | 2013-05-22 18:43:03 -0700 | [diff] [blame] | 1571 | struct smack_known *skp; |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 1572 | char *oldambient; |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1573 | char *data; |
| 1574 | int rc = count; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1575 | |
Casey Schaufler | 1880eff | 2012-06-05 15:28:30 -0700 | [diff] [blame] | 1576 | if (!smack_privileged(CAP_MAC_ADMIN)) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1577 | return -EPERM; |
| 1578 | |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1579 | data = kzalloc(count + 1, GFP_KERNEL); |
| 1580 | if (data == NULL) |
| 1581 | return -ENOMEM; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1582 | |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1583 | if (copy_from_user(data, buf, count) != 0) { |
| 1584 | rc = -EFAULT; |
| 1585 | goto out; |
| 1586 | } |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1587 | |
Casey Schaufler | 2f823ff | 2013-05-22 18:43:03 -0700 | [diff] [blame] | 1588 | skp = smk_import_entry(data, count); |
| 1589 | if (skp == NULL) { |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1590 | rc = -EINVAL; |
| 1591 | goto out; |
| 1592 | } |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1593 | |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 1594 | mutex_lock(&smack_ambient_lock); |
| 1595 | |
Casey Schaufler | 2f823ff | 2013-05-22 18:43:03 -0700 | [diff] [blame] | 1596 | oldambient = smack_net_ambient->smk_known; |
| 1597 | smack_net_ambient = skp; |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 1598 | smk_unlbl_ambient(oldambient); |
| 1599 | |
| 1600 | mutex_unlock(&smack_ambient_lock); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1601 | |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1602 | out: |
| 1603 | kfree(data); |
| 1604 | return rc; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1605 | } |
| 1606 | |
| 1607 | static const struct file_operations smk_ambient_ops = { |
| 1608 | .read = smk_read_ambient, |
| 1609 | .write = smk_write_ambient, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1610 | .llseek = default_llseek, |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1611 | }; |
| 1612 | |
Casey Schaufler | 1544623 | 2008-07-30 15:37:11 -0700 | [diff] [blame] | 1613 | /** |
Casey Schaufler | 00f84f3 | 2013-12-23 11:07:10 -0800 | [diff] [blame^] | 1614 | * smk_read_onlycap - read() for smackfs/onlycap |
Casey Schaufler | 1544623 | 2008-07-30 15:37:11 -0700 | [diff] [blame] | 1615 | * @filp: file pointer, not actually used |
| 1616 | * @buf: where to put the result |
| 1617 | * @cn: maximum to send along |
| 1618 | * @ppos: where to start |
| 1619 | * |
| 1620 | * Returns number of bytes read or error code, as appropriate |
| 1621 | */ |
| 1622 | static ssize_t smk_read_onlycap(struct file *filp, char __user *buf, |
| 1623 | size_t cn, loff_t *ppos) |
| 1624 | { |
| 1625 | char *smack = ""; |
| 1626 | ssize_t rc = -EINVAL; |
| 1627 | int asize; |
| 1628 | |
| 1629 | if (*ppos != 0) |
| 1630 | return 0; |
| 1631 | |
| 1632 | if (smack_onlycap != NULL) |
Casey Schaufler | 00f84f3 | 2013-12-23 11:07:10 -0800 | [diff] [blame^] | 1633 | smack = smack_onlycap->smk_known; |
Casey Schaufler | 1544623 | 2008-07-30 15:37:11 -0700 | [diff] [blame] | 1634 | |
| 1635 | asize = strlen(smack) + 1; |
| 1636 | |
| 1637 | if (cn >= asize) |
| 1638 | rc = simple_read_from_buffer(buf, cn, ppos, smack, asize); |
| 1639 | |
| 1640 | return rc; |
| 1641 | } |
| 1642 | |
| 1643 | /** |
Casey Schaufler | 00f84f3 | 2013-12-23 11:07:10 -0800 | [diff] [blame^] | 1644 | * smk_write_onlycap - write() for smackfs/onlycap |
Randy Dunlap | 251a2a9 | 2009-02-18 11:42:33 -0800 | [diff] [blame] | 1645 | * @file: file pointer, not actually used |
Casey Schaufler | 1544623 | 2008-07-30 15:37:11 -0700 | [diff] [blame] | 1646 | * @buf: where to get the data from |
| 1647 | * @count: bytes sent |
| 1648 | * @ppos: where to start |
| 1649 | * |
| 1650 | * Returns number of bytes written or error code, as appropriate |
| 1651 | */ |
| 1652 | static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, |
| 1653 | size_t count, loff_t *ppos) |
| 1654 | { |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1655 | char *data; |
Casey Schaufler | 2f823ff | 2013-05-22 18:43:03 -0700 | [diff] [blame] | 1656 | struct smack_known *skp = smk_of_task(current->cred->security); |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1657 | int rc = count; |
Casey Schaufler | 1544623 | 2008-07-30 15:37:11 -0700 | [diff] [blame] | 1658 | |
Casey Schaufler | 1880eff | 2012-06-05 15:28:30 -0700 | [diff] [blame] | 1659 | if (!smack_privileged(CAP_MAC_ADMIN)) |
Casey Schaufler | 1544623 | 2008-07-30 15:37:11 -0700 | [diff] [blame] | 1660 | return -EPERM; |
| 1661 | |
| 1662 | /* |
| 1663 | * This can be done using smk_access() but is done |
| 1664 | * explicitly for clarity. The smk_access() implementation |
| 1665 | * would use smk_access(smack_onlycap, MAY_WRITE) |
| 1666 | */ |
Casey Schaufler | 00f84f3 | 2013-12-23 11:07:10 -0800 | [diff] [blame^] | 1667 | if (smack_onlycap != NULL && smack_onlycap != skp) |
Casey Schaufler | 1544623 | 2008-07-30 15:37:11 -0700 | [diff] [blame] | 1668 | return -EPERM; |
| 1669 | |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1670 | data = kzalloc(count, GFP_KERNEL); |
| 1671 | if (data == NULL) |
| 1672 | return -ENOMEM; |
Casey Schaufler | 1544623 | 2008-07-30 15:37:11 -0700 | [diff] [blame] | 1673 | |
| 1674 | /* |
| 1675 | * Should the null string be passed in unset the onlycap value. |
| 1676 | * This seems like something to be careful with as usually |
| 1677 | * smk_import only expects to return NULL for errors. It |
| 1678 | * is usually the case that a nullstring or "\n" would be |
| 1679 | * bad to pass to smk_import but in fact this is useful here. |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1680 | * |
| 1681 | * smk_import will also reject a label beginning with '-', |
| 1682 | * so "-usecapabilities" will also work. |
Casey Schaufler | 1544623 | 2008-07-30 15:37:11 -0700 | [diff] [blame] | 1683 | */ |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1684 | if (copy_from_user(data, buf, count) != 0) |
| 1685 | rc = -EFAULT; |
| 1686 | else |
Casey Schaufler | 00f84f3 | 2013-12-23 11:07:10 -0800 | [diff] [blame^] | 1687 | smack_onlycap = smk_import_entry(data, count); |
Casey Schaufler | 1544623 | 2008-07-30 15:37:11 -0700 | [diff] [blame] | 1688 | |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1689 | kfree(data); |
| 1690 | return rc; |
Casey Schaufler | 1544623 | 2008-07-30 15:37:11 -0700 | [diff] [blame] | 1691 | } |
| 1692 | |
| 1693 | static const struct file_operations smk_onlycap_ops = { |
| 1694 | .read = smk_read_onlycap, |
| 1695 | .write = smk_write_onlycap, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1696 | .llseek = default_llseek, |
Casey Schaufler | 1544623 | 2008-07-30 15:37:11 -0700 | [diff] [blame] | 1697 | }; |
| 1698 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 1699 | /** |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1700 | * smk_read_logging - read() for /smack/logging |
| 1701 | * @filp: file pointer, not actually used |
| 1702 | * @buf: where to put the result |
| 1703 | * @cn: maximum to send along |
| 1704 | * @ppos: where to start |
| 1705 | * |
| 1706 | * Returns number of bytes read or error code, as appropriate |
| 1707 | */ |
| 1708 | static ssize_t smk_read_logging(struct file *filp, char __user *buf, |
| 1709 | size_t count, loff_t *ppos) |
| 1710 | { |
| 1711 | char temp[32]; |
| 1712 | ssize_t rc; |
| 1713 | |
| 1714 | if (*ppos != 0) |
| 1715 | return 0; |
| 1716 | |
| 1717 | sprintf(temp, "%d\n", log_policy); |
| 1718 | rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); |
| 1719 | return rc; |
| 1720 | } |
| 1721 | |
| 1722 | /** |
| 1723 | * smk_write_logging - write() for /smack/logging |
| 1724 | * @file: file pointer, not actually used |
| 1725 | * @buf: where to get the data from |
| 1726 | * @count: bytes sent |
| 1727 | * @ppos: where to start |
| 1728 | * |
| 1729 | * Returns number of bytes written or error code, as appropriate |
| 1730 | */ |
| 1731 | static ssize_t smk_write_logging(struct file *file, const char __user *buf, |
| 1732 | size_t count, loff_t *ppos) |
| 1733 | { |
| 1734 | char temp[32]; |
| 1735 | int i; |
| 1736 | |
Casey Schaufler | 1880eff | 2012-06-05 15:28:30 -0700 | [diff] [blame] | 1737 | if (!smack_privileged(CAP_MAC_ADMIN)) |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1738 | return -EPERM; |
| 1739 | |
| 1740 | if (count >= sizeof(temp) || count == 0) |
| 1741 | return -EINVAL; |
| 1742 | |
| 1743 | if (copy_from_user(temp, buf, count) != 0) |
| 1744 | return -EFAULT; |
| 1745 | |
| 1746 | temp[count] = '\0'; |
| 1747 | |
| 1748 | if (sscanf(temp, "%d", &i) != 1) |
| 1749 | return -EINVAL; |
| 1750 | if (i < 0 || i > 3) |
| 1751 | return -EINVAL; |
| 1752 | log_policy = i; |
| 1753 | return count; |
| 1754 | } |
| 1755 | |
| 1756 | |
| 1757 | |
| 1758 | static const struct file_operations smk_logging_ops = { |
| 1759 | .read = smk_read_logging, |
| 1760 | .write = smk_write_logging, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1761 | .llseek = default_llseek, |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 1762 | }; |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 1763 | |
| 1764 | /* |
| 1765 | * Seq_file read operations for /smack/load-self |
| 1766 | */ |
| 1767 | |
| 1768 | static void *load_self_seq_start(struct seq_file *s, loff_t *pos) |
| 1769 | { |
| 1770 | struct task_smack *tsp = current_security(); |
| 1771 | |
Casey Schaufler | 4080956 | 2011-11-10 15:02:22 -0800 | [diff] [blame] | 1772 | return smk_seq_start(s, pos, &tsp->smk_rules); |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 1773 | } |
| 1774 | |
| 1775 | static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos) |
| 1776 | { |
| 1777 | struct task_smack *tsp = current_security(); |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 1778 | |
Casey Schaufler | 4080956 | 2011-11-10 15:02:22 -0800 | [diff] [blame] | 1779 | return smk_seq_next(s, v, pos, &tsp->smk_rules); |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 1780 | } |
| 1781 | |
| 1782 | static int load_self_seq_show(struct seq_file *s, void *v) |
| 1783 | { |
| 1784 | struct list_head *list = v; |
| 1785 | struct smack_rule *srp = |
| 1786 | list_entry(list, struct smack_rule, list); |
| 1787 | |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1788 | smk_rule_show(s, srp, SMK_LABELLEN); |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 1789 | |
| 1790 | return 0; |
| 1791 | } |
| 1792 | |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 1793 | static const struct seq_operations load_self_seq_ops = { |
| 1794 | .start = load_self_seq_start, |
| 1795 | .next = load_self_seq_next, |
| 1796 | .show = load_self_seq_show, |
Casey Schaufler | 4080956 | 2011-11-10 15:02:22 -0800 | [diff] [blame] | 1797 | .stop = smk_seq_stop, |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 1798 | }; |
| 1799 | |
| 1800 | |
| 1801 | /** |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1802 | * smk_open_load_self - open() for /smack/load-self2 |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 1803 | * @inode: inode structure representing file |
| 1804 | * @file: "load" file pointer |
| 1805 | * |
| 1806 | * For reading, use load_seq_* seq_file reading operations. |
| 1807 | */ |
| 1808 | static int smk_open_load_self(struct inode *inode, struct file *file) |
| 1809 | { |
| 1810 | return seq_open(file, &load_self_seq_ops); |
| 1811 | } |
| 1812 | |
| 1813 | /** |
| 1814 | * smk_write_load_self - write() for /smack/load-self |
| 1815 | * @file: file pointer, not actually used |
| 1816 | * @buf: where to get the data from |
| 1817 | * @count: bytes sent |
| 1818 | * @ppos: where to start - must be 0 |
| 1819 | * |
| 1820 | */ |
| 1821 | static ssize_t smk_write_load_self(struct file *file, const char __user *buf, |
| 1822 | size_t count, loff_t *ppos) |
| 1823 | { |
| 1824 | struct task_smack *tsp = current_security(); |
| 1825 | |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1826 | return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, |
| 1827 | &tsp->smk_rules_lock, SMK_FIXED24_FMT); |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 1828 | } |
| 1829 | |
| 1830 | static const struct file_operations smk_load_self_ops = { |
| 1831 | .open = smk_open_load_self, |
| 1832 | .read = seq_read, |
| 1833 | .llseek = seq_lseek, |
| 1834 | .write = smk_write_load_self, |
| 1835 | .release = seq_release, |
| 1836 | }; |
Jarkko Sakkinen | 828716c | 2011-09-08 10:12:01 +0300 | [diff] [blame] | 1837 | |
| 1838 | /** |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1839 | * smk_user_access - handle access check transaction |
| 1840 | * @file: file pointer |
| 1841 | * @buf: data from user space |
| 1842 | * @count: bytes sent |
| 1843 | * @ppos: where to start - must be 0 |
| 1844 | */ |
| 1845 | static ssize_t smk_user_access(struct file *file, const char __user *buf, |
| 1846 | size_t count, loff_t *ppos, int format) |
| 1847 | { |
Rafal Krypa | e05b6f9 | 2013-01-10 19:42:00 +0100 | [diff] [blame] | 1848 | struct smack_parsed_rule rule; |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1849 | char *data; |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1850 | int res; |
| 1851 | |
| 1852 | data = simple_transaction_get(file, buf, count); |
| 1853 | if (IS_ERR(data)) |
| 1854 | return PTR_ERR(data); |
| 1855 | |
| 1856 | if (format == SMK_FIXED24_FMT) { |
| 1857 | if (count < SMK_LOADLEN) |
| 1858 | return -EINVAL; |
| 1859 | res = smk_parse_rule(data, &rule, 0); |
| 1860 | } else { |
| 1861 | /* |
Rafal Krypa | 10289b0 | 2013-08-09 11:47:07 +0200 | [diff] [blame] | 1862 | * simple_transaction_get() returns null-terminated data |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1863 | */ |
Rafal Krypa | 10289b0 | 2013-08-09 11:47:07 +0200 | [diff] [blame] | 1864 | res = smk_parse_long_rule(data, &rule, 0, 3); |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1865 | } |
| 1866 | |
Jarkko Sakkinen | 398ce07 | 2013-11-28 19:16:46 +0200 | [diff] [blame] | 1867 | if (res >= 0) |
| 1868 | res = smk_access(rule.smk_subject, rule.smk_object, |
| 1869 | rule.smk_access1, NULL); |
| 1870 | else if (res != -ENOENT) |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1871 | return -EINVAL; |
| 1872 | |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1873 | data[0] = res == 0 ? '1' : '0'; |
| 1874 | data[1] = '\0'; |
| 1875 | |
| 1876 | simple_transaction_set(file, 2); |
| 1877 | |
| 1878 | if (format == SMK_FIXED24_FMT) |
| 1879 | return SMK_LOADLEN; |
| 1880 | return count; |
| 1881 | } |
| 1882 | |
| 1883 | /** |
Jarkko Sakkinen | 828716c | 2011-09-08 10:12:01 +0300 | [diff] [blame] | 1884 | * smk_write_access - handle access check transaction |
| 1885 | * @file: file pointer |
| 1886 | * @buf: data from user space |
| 1887 | * @count: bytes sent |
| 1888 | * @ppos: where to start - must be 0 |
| 1889 | */ |
| 1890 | static ssize_t smk_write_access(struct file *file, const char __user *buf, |
| 1891 | size_t count, loff_t *ppos) |
| 1892 | { |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1893 | return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT); |
Jarkko Sakkinen | 828716c | 2011-09-08 10:12:01 +0300 | [diff] [blame] | 1894 | } |
| 1895 | |
| 1896 | static const struct file_operations smk_access_ops = { |
| 1897 | .write = smk_write_access, |
| 1898 | .read = simple_transaction_read, |
| 1899 | .release = simple_transaction_release, |
| 1900 | .llseek = generic_file_llseek, |
| 1901 | }; |
| 1902 | |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1903 | |
| 1904 | /* |
| 1905 | * Seq_file read operations for /smack/load2 |
| 1906 | */ |
| 1907 | |
| 1908 | static int load2_seq_show(struct seq_file *s, void *v) |
| 1909 | { |
| 1910 | struct list_head *list = v; |
| 1911 | struct smack_master_list *smlp = |
| 1912 | list_entry(list, struct smack_master_list, list); |
| 1913 | |
| 1914 | smk_rule_show(s, smlp->smk_rule, SMK_LONGLABEL); |
| 1915 | |
| 1916 | return 0; |
| 1917 | } |
| 1918 | |
| 1919 | static const struct seq_operations load2_seq_ops = { |
| 1920 | .start = load2_seq_start, |
| 1921 | .next = load2_seq_next, |
| 1922 | .show = load2_seq_show, |
| 1923 | .stop = smk_seq_stop, |
| 1924 | }; |
| 1925 | |
| 1926 | /** |
| 1927 | * smk_open_load2 - open() for /smack/load2 |
| 1928 | * @inode: inode structure representing file |
| 1929 | * @file: "load2" file pointer |
| 1930 | * |
| 1931 | * For reading, use load2_seq_* seq_file reading operations. |
| 1932 | */ |
| 1933 | static int smk_open_load2(struct inode *inode, struct file *file) |
| 1934 | { |
| 1935 | return seq_open(file, &load2_seq_ops); |
| 1936 | } |
| 1937 | |
| 1938 | /** |
| 1939 | * smk_write_load2 - write() for /smack/load2 |
| 1940 | * @file: file pointer, not actually used |
| 1941 | * @buf: where to get the data from |
| 1942 | * @count: bytes sent |
| 1943 | * @ppos: where to start - must be 0 |
| 1944 | * |
| 1945 | */ |
| 1946 | static ssize_t smk_write_load2(struct file *file, const char __user *buf, |
| 1947 | size_t count, loff_t *ppos) |
| 1948 | { |
| 1949 | /* |
| 1950 | * Must have privilege. |
| 1951 | */ |
Casey Schaufler | 1880eff | 2012-06-05 15:28:30 -0700 | [diff] [blame] | 1952 | if (!smack_privileged(CAP_MAC_ADMIN)) |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 1953 | return -EPERM; |
| 1954 | |
| 1955 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, |
| 1956 | SMK_LONG_FMT); |
| 1957 | } |
| 1958 | |
| 1959 | static const struct file_operations smk_load2_ops = { |
| 1960 | .open = smk_open_load2, |
| 1961 | .read = seq_read, |
| 1962 | .llseek = seq_lseek, |
| 1963 | .write = smk_write_load2, |
| 1964 | .release = seq_release, |
| 1965 | }; |
| 1966 | |
| 1967 | /* |
| 1968 | * Seq_file read operations for /smack/load-self2 |
| 1969 | */ |
| 1970 | |
| 1971 | static void *load_self2_seq_start(struct seq_file *s, loff_t *pos) |
| 1972 | { |
| 1973 | struct task_smack *tsp = current_security(); |
| 1974 | |
| 1975 | return smk_seq_start(s, pos, &tsp->smk_rules); |
| 1976 | } |
| 1977 | |
| 1978 | static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos) |
| 1979 | { |
| 1980 | struct task_smack *tsp = current_security(); |
| 1981 | |
| 1982 | return smk_seq_next(s, v, pos, &tsp->smk_rules); |
| 1983 | } |
| 1984 | |
| 1985 | static int load_self2_seq_show(struct seq_file *s, void *v) |
| 1986 | { |
| 1987 | struct list_head *list = v; |
| 1988 | struct smack_rule *srp = |
| 1989 | list_entry(list, struct smack_rule, list); |
| 1990 | |
| 1991 | smk_rule_show(s, srp, SMK_LONGLABEL); |
| 1992 | |
| 1993 | return 0; |
| 1994 | } |
| 1995 | |
| 1996 | static const struct seq_operations load_self2_seq_ops = { |
| 1997 | .start = load_self2_seq_start, |
| 1998 | .next = load_self2_seq_next, |
| 1999 | .show = load_self2_seq_show, |
| 2000 | .stop = smk_seq_stop, |
| 2001 | }; |
| 2002 | |
| 2003 | /** |
| 2004 | * smk_open_load_self2 - open() for /smack/load-self2 |
| 2005 | * @inode: inode structure representing file |
| 2006 | * @file: "load" file pointer |
| 2007 | * |
| 2008 | * For reading, use load_seq_* seq_file reading operations. |
| 2009 | */ |
| 2010 | static int smk_open_load_self2(struct inode *inode, struct file *file) |
| 2011 | { |
| 2012 | return seq_open(file, &load_self2_seq_ops); |
| 2013 | } |
| 2014 | |
| 2015 | /** |
| 2016 | * smk_write_load_self2 - write() for /smack/load-self2 |
| 2017 | * @file: file pointer, not actually used |
| 2018 | * @buf: where to get the data from |
| 2019 | * @count: bytes sent |
| 2020 | * @ppos: where to start - must be 0 |
| 2021 | * |
| 2022 | */ |
| 2023 | static ssize_t smk_write_load_self2(struct file *file, const char __user *buf, |
| 2024 | size_t count, loff_t *ppos) |
| 2025 | { |
| 2026 | struct task_smack *tsp = current_security(); |
| 2027 | |
| 2028 | return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, |
| 2029 | &tsp->smk_rules_lock, SMK_LONG_FMT); |
| 2030 | } |
| 2031 | |
| 2032 | static const struct file_operations smk_load_self2_ops = { |
| 2033 | .open = smk_open_load_self2, |
| 2034 | .read = seq_read, |
| 2035 | .llseek = seq_lseek, |
| 2036 | .write = smk_write_load_self2, |
| 2037 | .release = seq_release, |
| 2038 | }; |
| 2039 | |
| 2040 | /** |
| 2041 | * smk_write_access2 - handle access check transaction |
| 2042 | * @file: file pointer |
| 2043 | * @buf: data from user space |
| 2044 | * @count: bytes sent |
| 2045 | * @ppos: where to start - must be 0 |
| 2046 | */ |
| 2047 | static ssize_t smk_write_access2(struct file *file, const char __user *buf, |
| 2048 | size_t count, loff_t *ppos) |
| 2049 | { |
| 2050 | return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT); |
| 2051 | } |
| 2052 | |
| 2053 | static const struct file_operations smk_access2_ops = { |
| 2054 | .write = smk_write_access2, |
| 2055 | .read = simple_transaction_read, |
| 2056 | .release = simple_transaction_release, |
| 2057 | .llseek = generic_file_llseek, |
| 2058 | }; |
| 2059 | |
Etienne Basset | ecfcc53 | 2009-04-08 20:40:06 +0200 | [diff] [blame] | 2060 | /** |
Rafal Krypa | 449543b | 2012-07-11 17:49:30 +0200 | [diff] [blame] | 2061 | * smk_write_revoke_subj - write() for /smack/revoke-subject |
| 2062 | * @file: file pointer |
| 2063 | * @buf: data from user space |
| 2064 | * @count: bytes sent |
| 2065 | * @ppos: where to start - must be 0 |
| 2066 | */ |
| 2067 | static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf, |
| 2068 | size_t count, loff_t *ppos) |
| 2069 | { |
| 2070 | char *data = NULL; |
| 2071 | const char *cp = NULL; |
| 2072 | struct smack_known *skp; |
| 2073 | struct smack_rule *sp; |
| 2074 | struct list_head *rule_list; |
| 2075 | struct mutex *rule_lock; |
| 2076 | int rc = count; |
| 2077 | |
| 2078 | if (*ppos != 0) |
| 2079 | return -EINVAL; |
| 2080 | |
| 2081 | if (!smack_privileged(CAP_MAC_ADMIN)) |
| 2082 | return -EPERM; |
| 2083 | |
| 2084 | if (count == 0 || count > SMK_LONGLABEL) |
| 2085 | return -EINVAL; |
| 2086 | |
| 2087 | data = kzalloc(count, GFP_KERNEL); |
| 2088 | if (data == NULL) |
| 2089 | return -ENOMEM; |
| 2090 | |
| 2091 | if (copy_from_user(data, buf, count) != 0) { |
| 2092 | rc = -EFAULT; |
| 2093 | goto free_out; |
| 2094 | } |
| 2095 | |
| 2096 | cp = smk_parse_smack(data, count); |
| 2097 | if (cp == NULL) { |
| 2098 | rc = -EINVAL; |
| 2099 | goto free_out; |
| 2100 | } |
| 2101 | |
| 2102 | skp = smk_find_entry(cp); |
Rafal Krypa | d15d9fa | 2012-11-27 16:28:11 +0100 | [diff] [blame] | 2103 | if (skp == NULL) |
Rafal Krypa | 449543b | 2012-07-11 17:49:30 +0200 | [diff] [blame] | 2104 | goto free_out; |
Rafal Krypa | 449543b | 2012-07-11 17:49:30 +0200 | [diff] [blame] | 2105 | |
| 2106 | rule_list = &skp->smk_rules; |
| 2107 | rule_lock = &skp->smk_rules_lock; |
| 2108 | |
| 2109 | mutex_lock(rule_lock); |
| 2110 | |
| 2111 | list_for_each_entry_rcu(sp, rule_list, list) |
| 2112 | sp->smk_access = 0; |
| 2113 | |
| 2114 | mutex_unlock(rule_lock); |
| 2115 | |
| 2116 | free_out: |
| 2117 | kfree(data); |
| 2118 | kfree(cp); |
| 2119 | return rc; |
| 2120 | } |
| 2121 | |
| 2122 | static const struct file_operations smk_revoke_subj_ops = { |
| 2123 | .write = smk_write_revoke_subj, |
| 2124 | .read = simple_transaction_read, |
| 2125 | .release = simple_transaction_release, |
| 2126 | .llseek = generic_file_llseek, |
| 2127 | }; |
| 2128 | |
Casey Schaufler | e930723 | 2012-11-01 18:14:32 -0700 | [diff] [blame] | 2129 | static struct kset *smackfs_kset; |
| 2130 | /** |
| 2131 | * smk_init_sysfs - initialize /sys/fs/smackfs |
| 2132 | * |
| 2133 | */ |
| 2134 | static int smk_init_sysfs(void) |
| 2135 | { |
| 2136 | smackfs_kset = kset_create_and_add("smackfs", NULL, fs_kobj); |
| 2137 | if (!smackfs_kset) |
| 2138 | return -ENOMEM; |
| 2139 | return 0; |
| 2140 | } |
| 2141 | |
Rafal Krypa | 449543b | 2012-07-11 17:49:30 +0200 | [diff] [blame] | 2142 | /** |
Rafal Krypa | e05b6f9 | 2013-01-10 19:42:00 +0100 | [diff] [blame] | 2143 | * smk_write_change_rule - write() for /smack/change-rule |
| 2144 | * @file: file pointer |
| 2145 | * @buf: data from user space |
| 2146 | * @count: bytes sent |
| 2147 | * @ppos: where to start - must be 0 |
| 2148 | */ |
| 2149 | static ssize_t smk_write_change_rule(struct file *file, const char __user *buf, |
| 2150 | size_t count, loff_t *ppos) |
| 2151 | { |
| 2152 | /* |
| 2153 | * Must have privilege. |
| 2154 | */ |
| 2155 | if (!capable(CAP_MAC_ADMIN)) |
| 2156 | return -EPERM; |
| 2157 | |
| 2158 | return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, |
| 2159 | SMK_CHANGE_FMT); |
| 2160 | } |
| 2161 | |
| 2162 | static const struct file_operations smk_change_rule_ops = { |
| 2163 | .write = smk_write_change_rule, |
| 2164 | .read = simple_transaction_read, |
| 2165 | .release = simple_transaction_release, |
| 2166 | .llseek = generic_file_llseek, |
| 2167 | }; |
| 2168 | |
| 2169 | /** |
Casey Schaufler | 00f84f3 | 2013-12-23 11:07:10 -0800 | [diff] [blame^] | 2170 | * smk_read_syslog - read() for smackfs/syslog |
| 2171 | * @filp: file pointer, not actually used |
| 2172 | * @buf: where to put the result |
| 2173 | * @cn: maximum to send along |
| 2174 | * @ppos: where to start |
| 2175 | * |
| 2176 | * Returns number of bytes read or error code, as appropriate |
| 2177 | */ |
| 2178 | static ssize_t smk_read_syslog(struct file *filp, char __user *buf, |
| 2179 | size_t cn, loff_t *ppos) |
| 2180 | { |
| 2181 | struct smack_known *skp; |
| 2182 | ssize_t rc = -EINVAL; |
| 2183 | int asize; |
| 2184 | |
| 2185 | if (*ppos != 0) |
| 2186 | return 0; |
| 2187 | |
| 2188 | if (smack_syslog_label == NULL) |
| 2189 | skp = &smack_known_star; |
| 2190 | else |
| 2191 | skp = smack_syslog_label; |
| 2192 | |
| 2193 | asize = strlen(skp->smk_known) + 1; |
| 2194 | |
| 2195 | if (cn >= asize) |
| 2196 | rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known, |
| 2197 | asize); |
| 2198 | |
| 2199 | return rc; |
| 2200 | } |
| 2201 | |
| 2202 | /** |
| 2203 | * smk_write_syslog - write() for smackfs/syslog |
| 2204 | * @file: file pointer, not actually used |
| 2205 | * @buf: where to get the data from |
| 2206 | * @count: bytes sent |
| 2207 | * @ppos: where to start |
| 2208 | * |
| 2209 | * Returns number of bytes written or error code, as appropriate |
| 2210 | */ |
| 2211 | static ssize_t smk_write_syslog(struct file *file, const char __user *buf, |
| 2212 | size_t count, loff_t *ppos) |
| 2213 | { |
| 2214 | char *data; |
| 2215 | struct smack_known *skp; |
| 2216 | int rc = count; |
| 2217 | |
| 2218 | if (!smack_privileged(CAP_MAC_ADMIN)) |
| 2219 | return -EPERM; |
| 2220 | |
| 2221 | data = kzalloc(count, GFP_KERNEL); |
| 2222 | if (data == NULL) |
| 2223 | return -ENOMEM; |
| 2224 | |
| 2225 | if (copy_from_user(data, buf, count) != 0) |
| 2226 | rc = -EFAULT; |
| 2227 | else { |
| 2228 | skp = smk_import_entry(data, count); |
| 2229 | if (skp == NULL) |
| 2230 | rc = -EINVAL; |
| 2231 | else |
| 2232 | smack_syslog_label = smk_import_entry(data, count); |
| 2233 | } |
| 2234 | |
| 2235 | kfree(data); |
| 2236 | return rc; |
| 2237 | } |
| 2238 | |
| 2239 | static const struct file_operations smk_syslog_ops = { |
| 2240 | .read = smk_read_syslog, |
| 2241 | .write = smk_write_syslog, |
| 2242 | .llseek = default_llseek, |
| 2243 | }; |
| 2244 | |
| 2245 | |
| 2246 | /** |
| 2247 | * smk_fill_super - fill the smackfs superblock |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2248 | * @sb: the empty superblock |
| 2249 | * @data: unused |
| 2250 | * @silent: unused |
| 2251 | * |
Casey Schaufler | 00f84f3 | 2013-12-23 11:07:10 -0800 | [diff] [blame^] | 2252 | * Fill in the well known entries for the smack filesystem |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2253 | * |
| 2254 | * Returns 0 on success, an error code on failure |
| 2255 | */ |
| 2256 | static int smk_fill_super(struct super_block *sb, void *data, int silent) |
| 2257 | { |
| 2258 | int rc; |
| 2259 | struct inode *root_inode; |
| 2260 | |
| 2261 | static struct tree_descr smack_files[] = { |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 2262 | [SMK_LOAD] = { |
| 2263 | "load", &smk_load_ops, S_IRUGO|S_IWUSR}, |
| 2264 | [SMK_CIPSO] = { |
| 2265 | "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR}, |
| 2266 | [SMK_DOI] = { |
| 2267 | "doi", &smk_doi_ops, S_IRUGO|S_IWUSR}, |
| 2268 | [SMK_DIRECT] = { |
| 2269 | "direct", &smk_direct_ops, S_IRUGO|S_IWUSR}, |
| 2270 | [SMK_AMBIENT] = { |
| 2271 | "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR}, |
| 2272 | [SMK_NETLBLADDR] = { |
| 2273 | "netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR}, |
| 2274 | [SMK_ONLYCAP] = { |
| 2275 | "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR}, |
| 2276 | [SMK_LOGGING] = { |
| 2277 | "logging", &smk_logging_ops, S_IRUGO|S_IWUSR}, |
| 2278 | [SMK_LOAD_SELF] = { |
| 2279 | "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO}, |
Jarkko Sakkinen | 828716c | 2011-09-08 10:12:01 +0300 | [diff] [blame] | 2280 | [SMK_ACCESSES] = { |
Jarkko Sakkinen | 0e94ae1 | 2011-10-18 21:21:36 +0300 | [diff] [blame] | 2281 | "access", &smk_access_ops, S_IRUGO|S_IWUGO}, |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 2282 | [SMK_MAPPED] = { |
| 2283 | "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR}, |
| 2284 | [SMK_LOAD2] = { |
| 2285 | "load2", &smk_load2_ops, S_IRUGO|S_IWUSR}, |
| 2286 | [SMK_LOAD_SELF2] = { |
| 2287 | "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO}, |
| 2288 | [SMK_ACCESS2] = { |
| 2289 | "access2", &smk_access2_ops, S_IRUGO|S_IWUGO}, |
| 2290 | [SMK_CIPSO2] = { |
| 2291 | "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR}, |
Rafal Krypa | 449543b | 2012-07-11 17:49:30 +0200 | [diff] [blame] | 2292 | [SMK_REVOKE_SUBJ] = { |
| 2293 | "revoke-subject", &smk_revoke_subj_ops, |
| 2294 | S_IRUGO|S_IWUSR}, |
Rafal Krypa | e05b6f9 | 2013-01-10 19:42:00 +0100 | [diff] [blame] | 2295 | [SMK_CHANGE_RULE] = { |
| 2296 | "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR}, |
Casey Schaufler | 00f84f3 | 2013-12-23 11:07:10 -0800 | [diff] [blame^] | 2297 | [SMK_SYSLOG] = { |
| 2298 | "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR}, |
Casey Schaufler | 7898e1f | 2011-01-17 08:05:27 -0800 | [diff] [blame] | 2299 | /* last one */ |
| 2300 | {""} |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2301 | }; |
| 2302 | |
| 2303 | rc = simple_fill_super(sb, SMACK_MAGIC, smack_files); |
| 2304 | if (rc != 0) { |
| 2305 | printk(KERN_ERR "%s failed %d while creating inodes\n", |
| 2306 | __func__, rc); |
| 2307 | return rc; |
| 2308 | } |
| 2309 | |
| 2310 | root_inode = sb->s_root->d_inode; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2311 | |
| 2312 | return 0; |
| 2313 | } |
| 2314 | |
| 2315 | /** |
Al Viro | fc14f2f | 2010-07-25 01:48:30 +0400 | [diff] [blame] | 2316 | * smk_mount - get the smackfs superblock |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2317 | * @fs_type: passed along without comment |
| 2318 | * @flags: passed along without comment |
| 2319 | * @dev_name: passed along without comment |
| 2320 | * @data: passed along without comment |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2321 | * |
| 2322 | * Just passes everything along. |
| 2323 | * |
| 2324 | * Returns what the lower level code does. |
| 2325 | */ |
Al Viro | fc14f2f | 2010-07-25 01:48:30 +0400 | [diff] [blame] | 2326 | static struct dentry *smk_mount(struct file_system_type *fs_type, |
| 2327 | int flags, const char *dev_name, void *data) |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2328 | { |
Al Viro | fc14f2f | 2010-07-25 01:48:30 +0400 | [diff] [blame] | 2329 | return mount_single(fs_type, flags, data, smk_fill_super); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2330 | } |
| 2331 | |
| 2332 | static struct file_system_type smk_fs_type = { |
| 2333 | .name = "smackfs", |
Al Viro | fc14f2f | 2010-07-25 01:48:30 +0400 | [diff] [blame] | 2334 | .mount = smk_mount, |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2335 | .kill_sb = kill_litter_super, |
| 2336 | }; |
| 2337 | |
| 2338 | static struct vfsmount *smackfs_mount; |
| 2339 | |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 2340 | static int __init smk_preset_netlabel(struct smack_known *skp) |
| 2341 | { |
| 2342 | skp->smk_netlabel.domain = skp->smk_known; |
| 2343 | skp->smk_netlabel.flags = |
| 2344 | NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL; |
| 2345 | return smk_netlbl_mls(smack_cipso_direct, skp->smk_known, |
| 2346 | &skp->smk_netlabel, strlen(skp->smk_known)); |
| 2347 | } |
| 2348 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2349 | /** |
| 2350 | * init_smk_fs - get the smackfs superblock |
| 2351 | * |
| 2352 | * register the smackfs |
| 2353 | * |
Ahmed S. Darwish | 076c54c | 2008-03-06 18:09:10 +0200 | [diff] [blame] | 2354 | * Do not register smackfs if Smack wasn't enabled |
| 2355 | * on boot. We can not put this method normally under the |
| 2356 | * smack_init() code path since the security subsystem get |
| 2357 | * initialized before the vfs caches. |
| 2358 | * |
| 2359 | * Returns true if we were not chosen on boot or if |
| 2360 | * we were chosen and filesystem registration succeeded. |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2361 | */ |
| 2362 | static int __init init_smk_fs(void) |
| 2363 | { |
| 2364 | int err; |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 2365 | int rc; |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2366 | |
Ahmed S. Darwish | 076c54c | 2008-03-06 18:09:10 +0200 | [diff] [blame] | 2367 | if (!security_module_enable(&smack_ops)) |
| 2368 | return 0; |
| 2369 | |
Casey Schaufler | e930723 | 2012-11-01 18:14:32 -0700 | [diff] [blame] | 2370 | err = smk_init_sysfs(); |
| 2371 | if (err) |
| 2372 | printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n"); |
| 2373 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2374 | err = register_filesystem(&smk_fs_type); |
| 2375 | if (!err) { |
| 2376 | smackfs_mount = kern_mount(&smk_fs_type); |
| 2377 | if (IS_ERR(smackfs_mount)) { |
| 2378 | printk(KERN_ERR "smackfs: could not mount!\n"); |
| 2379 | err = PTR_ERR(smackfs_mount); |
| 2380 | smackfs_mount = NULL; |
| 2381 | } |
| 2382 | } |
| 2383 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2384 | smk_cipso_doi(); |
Casey Schaufler | 4bc87e6 | 2008-02-15 15:24:25 -0800 | [diff] [blame] | 2385 | smk_unlbl_ambient(NULL); |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2386 | |
Casey Schaufler | f7112e6 | 2012-05-06 15:22:02 -0700 | [diff] [blame] | 2387 | rc = smk_preset_netlabel(&smack_known_floor); |
| 2388 | if (err == 0 && rc < 0) |
| 2389 | err = rc; |
| 2390 | rc = smk_preset_netlabel(&smack_known_hat); |
| 2391 | if (err == 0 && rc < 0) |
| 2392 | err = rc; |
| 2393 | rc = smk_preset_netlabel(&smack_known_huh); |
| 2394 | if (err == 0 && rc < 0) |
| 2395 | err = rc; |
| 2396 | rc = smk_preset_netlabel(&smack_known_invalid); |
| 2397 | if (err == 0 && rc < 0) |
| 2398 | err = rc; |
| 2399 | rc = smk_preset_netlabel(&smack_known_star); |
| 2400 | if (err == 0 && rc < 0) |
| 2401 | err = rc; |
| 2402 | rc = smk_preset_netlabel(&smack_known_web); |
| 2403 | if (err == 0 && rc < 0) |
| 2404 | err = rc; |
| 2405 | |
Casey Schaufler | e114e47 | 2008-02-04 22:29:50 -0800 | [diff] [blame] | 2406 | return err; |
| 2407 | } |
| 2408 | |
| 2409 | __initcall(init_smk_fs); |