0001-apparmor-add-base-infastructure-for-socket-mediation.patch

   1 From 27d9aac1346ff7feb6a49bfb33510c2d79a41da7 Mon Sep 17 00:00:00 2001
   2 From: John Johansen <john.johansen@canonical.com>
   3 Date: Tue, 18 Jul 2017 23:18:33 -0700
   4 Subject: [PATCH 1/2] apparmor: add base infastructure for socket mediation
   5
   6 Provide a basic mediation of sockets. This is not a full net mediation
   7 but just whether a spcific family of socket can be used by an
   8 application, along with setting up some basic infrastructure for
   9 network mediation to follow.
  10
  11 the user space rule hav the basic form of
  12   NETWORK RULE = [ QUALIFIERS ] 'network' [ DOMAIN ]
  13                  [ TYPE | PROTOCOL ]
  14
  15   DOMAIN = ( 'inet' | 'ax25' | 'ipx' | 'appletalk' | 'netrom' |
  16              'bridge' | 'atmpvc' | 'x25' | 'inet6' | 'rose' |
  17              'netbeui' | 'security' | 'key' | 'packet' | 'ash' |
  18              'econet' | 'atmsvc' | 'sna' | 'irda' | 'pppox' |
  19              'wanpipe' | 'bluetooth' | 'netlink' | 'unix' | 'rds' |
  20              'llc' | 'can' | 'tipc' | 'iucv' | 'rxrpc' | 'isdn' |
  21              'phonet' | 'ieee802154' | 'caif' | 'alg' | 'nfc' |
  22              'vsock' | 'mpls' | 'ib' | 'kcm' ) ','
  23
  24   TYPE = ( 'stream' | 'dgram' | 'seqpacket' |  'rdm' | 'raw' |
  25            'packet' )
  26
  27   PROTOCOL = ( 'tcp' | 'udp' | 'icmp' )
  28
  29 eg.
  30   network,
  31   network inet,
  32
  33 Signed-off-by: John Johansen <john.johansen@canonical.com>
  34 Acked-by: Seth Arnold <seth.arnold@canonical.com>
  35 ---
  36  security/apparmor/.gitignore       |   1 +
  37  security/apparmor/Makefile         |  43 ++++-
  38  security/apparmor/apparmorfs.c     |   1 +
  39  security/apparmor/file.c           |  30 +++
  40  security/apparmor/include/audit.h  |  16 +-
  41  security/apparmor/include/net.h    | 114 +++++++++++
  42  security/apparmor/include/perms.h  |   5 +-
  43  security/apparmor/include/policy.h |  13 ++
  44  security/apparmor/lib.c            |   5 +-
  45  security/apparmor/lsm.c            | 387 +++++++++++++++++++++++++++++++++++++
  46  security/apparmor/net.c            | 184 ++++++++++++++++++
  47  security/apparmor/policy_unpack.c  |  47 ++++-
  48  12 files changed, 834 insertions(+), 12 deletions(-)
  49  create mode 100644 security/apparmor/include/net.h
  50  create mode 100644 security/apparmor/net.c
  51
  52 diff --git a/security/apparmor/.gitignore b/security/apparmor/.gitignore
  53 index 9cdec70d72b8..d5b291e94264 100644
  54 --- a/security/apparmor/.gitignore
  55 +++ b/security/apparmor/.gitignore
  56 @@ -1,5 +1,6 @@
  57  #
  58  # Generated include files
  59  #
  60 +net_names.h
  61  capability_names.h
  62  rlim_names.h
  63 diff --git a/security/apparmor/Makefile b/security/apparmor/Makefile
  64 index 9a6b4033d52b..e7ff2183532a 100644
  65 --- a/security/apparmor/Makefile
  66 +++ b/security/apparmor/Makefile
  67 @@ -5,11 +5,44 @@ obj-$(CONFIG_SECURITY_APPARMOR) += apparmor.o
  68
  69  apparmor-y := apparmorfs.o audit.o capability.o context.o ipc.o lib.o match.o \
  70                path.o domain.o policy.o policy_unpack.o procattr.o lsm.o \
  71 -              resource.o secid.o file.o policy_ns.o label.o mount.o
  72 +              resource.o secid.o file.o policy_ns.o label.o mount.o net.o
  73  apparmor-$(CONFIG_SECURITY_APPARMOR_HASH) += crypto.o
  74
  75 -clean-files := capability_names.h rlim_names.h
  76 +clean-files := capability_names.h rlim_names.h net_names.h
  77
  78 +# Build a lower case string table of address family names
  79 +# Transform lines from
  80 +#    #define AF_LOCAL          1       /* POSIX name for AF_UNIX       */
  81 +#    #define AF_INET           2       /* Internet IP Protocol         */
  82 +# to
  83 +#    [1] = "local",
  84 +#    [2] = "inet",
  85 +#
  86 +# and build the securityfs entries for the mapping.
  87 +# Transforms lines from
  88 +#    #define AF_INET           2       /* Internet IP Protocol         */
  89 +# to
  90 +#    #define AA_SFS_AF_MASK "local inet"
  91 +quiet_cmd_make-af = GEN     $@
  92 +cmd_make-af = echo "static const char *address_family_names[] = {" > $@ ;\
  93 +       sed $< >>$@ -r -n -e "/AF_MAX/d" -e "/AF_LOCAL/d" -e "/AF_ROUTE/d" -e \
  94 +        's/^\#define[ \t]+AF_([A-Z0-9_]+)[ \t]+([0-9]+)(.*)/[\2] = "\L\1",/p';\
  95 +       echo "};" >> $@ ;\
  96 +       printf '%s' '\#define AA_SFS_AF_MASK "' >> $@ ;\
  97 +       sed -r -n -e "/AF_MAX/d" -e "/AF_LOCAL/d" -e "/AF_ROUTE/d" -e \
  98 +        's/^\#define[ \t]+AF_([A-Z0-9_]+)[ \t]+([0-9]+)(.*)/\L\1/p'\
  99 +        $< | tr '\n' ' ' | sed -e 's/ $$/"\n/' >> $@
 100 +
 101 +# Build a lower case string table of sock type names
 102 +# Transform lines from
 103 +#    SOCK_STREAM       = 1,
 104 +# to
 105 +#    [1] = "stream",
 106 +quiet_cmd_make-sock = GEN     $@
 107 +cmd_make-sock = echo "static const char *sock_type_names[] = {" >> $@ ;\
 108 +       sed $^ >>$@ -r -n \
 109 +       -e 's/^\tSOCK_([A-Z0-9_]+)[\t]+=[ \t]+([0-9]+)(.*)/[\2] = "\L\1",/p';\
 110 +       echo "};" >> $@
 111
 112  # Build a lower case string table of capability names
 113  # Transforms lines from
 114 @@ -62,6 +95,7 @@ cmd_make-rlim = echo "static const char *const rlim_names[RLIM_NLIMITS] = {" \
 115             tr '\n' ' ' | sed -e 's/ $$/"\n/' >> $@
 116
 117  $(obj)/capability.o : $(obj)/capability_names.h
 118 +$(obj)/net.o : $(obj)/net_names.h
 119  $(obj)/resource.o : $(obj)/rlim_names.h
 120  $(obj)/capability_names.h : $(srctree)/include/uapi/linux/capability.h \
 121                             $(src)/Makefile
 122 @@ -69,3 +103,8 @@ $(obj)/capability_names.h : $(srctree)/include/uapi/linux/capability.h \
 123  $(obj)/rlim_names.h : $(srctree)/include/uapi/asm-generic/resource.h \
 124                       $(src)/Makefile
 125         $(call cmd,make-rlim)
 126 +$(obj)/net_names.h : $(srctree)/include/linux/socket.h \
 127 +                    $(srctree)/include/linux/net.h \
 128 +                    $(src)/Makefile
 129 +       $(call cmd,make-af)
 130 +       $(call cmd,make-sock)
 131 diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c
 132 index d4fa04d91439..694c4f48a975 100644
 133 --- a/security/apparmor/apparmorfs.c
 134 +++ b/security/apparmor/apparmorfs.c
 135 @@ -2202,6 +2202,7 @@ static struct aa_sfs_entry aa_sfs_entry_features[] = {
 136         AA_SFS_DIR("policy",                    aa_sfs_entry_policy),
 137         AA_SFS_DIR("domain",                    aa_sfs_entry_domain),
 138         AA_SFS_DIR("file",                      aa_sfs_entry_file),
 139 +       AA_SFS_DIR("network",                   aa_sfs_entry_network),
 140         AA_SFS_DIR("mount",                     aa_sfs_entry_mount),
 141         AA_SFS_DIR("namespaces",                aa_sfs_entry_ns),
 142         AA_SFS_FILE_U64("capability",           VFS_CAP_FLAGS_MASK),
 143 diff --git a/security/apparmor/file.c b/security/apparmor/file.c
 144 index e79bf44396a3..86d57e56fabe 100644
 145 --- a/security/apparmor/file.c
 146 +++ b/security/apparmor/file.c
 147 @@ -21,6 +21,7 @@
 148  #include "include/context.h"
 149  #include "include/file.h"
 150  #include "include/match.h"
 151 +#include "include/net.h"
 152  #include "include/path.h"
 153  #include "include/policy.h"
 154  #include "include/label.h"
 155 @@ -560,6 +561,32 @@ static int __file_path_perm(const char *op, struct aa_label *label,
 156         return error;
 157  }
 158
 159 +static int __file_sock_perm(const char *op, struct aa_label *label,
 160 +                           struct aa_label *flabel, struct file *file,
 161 +                           u32 request, u32 denied)
 162 +{
 163 +       struct socket *sock = (struct socket *) file->private_data;
 164 +       int error;
 165 +
 166 +       AA_BUG(!sock);
 167 +
 168 +       /* revalidation due to label out of date. No revocation at this time */
 169 +       if (!denied && aa_label_is_subset(flabel, label))
 170 +               return 0;
 171 +
 172 +       /* TODO: improve to skip profiles cached in flabel */
 173 +       error = aa_sock_file_perm(label, op, request, sock);
 174 +       if (denied) {
 175 +               /* TODO: improve to skip profiles checked above */
 176 +               /* check every profile in file label to is cached */
 177 +               last_error(error, aa_sock_file_perm(flabel, op, request, sock));
 178 +       }
 179 +       if (!error)
 180 +               update_file_ctx(file_ctx(file), label, request);
 181 +
 182 +       return error;
 183 +}
 184 +
 185  /**
 186   * aa_file_perm - do permission revalidation check & audit for @file
 187   * @op: operation being checked
 188 @@ -604,6 +631,9 @@ int aa_file_perm(const char *op, struct aa_label *label, struct file *file,
 189                 error = __file_path_perm(op, label, flabel, file, request,
 190                                          denied);
 191
 192 +       else if (S_ISSOCK(file_inode(file)->i_mode))
 193 +               error = __file_sock_perm(op, label, flabel, file, request,
 194 +                                        denied);
 195  done:
 196         rcu_read_unlock();
 197
 198 diff --git a/security/apparmor/include/audit.h b/security/apparmor/include/audit.h
 199 index 4ac095118717..ff4316e1068d 100644
 200 --- a/security/apparmor/include/audit.h
 201 +++ b/security/apparmor/include/audit.h
 202 @@ -123,9 +123,15 @@ struct apparmor_audit_data {
 203                         struct aa_label *peer;
 204                         union {
 205                                 struct {
 206 -                                       const char *target;
 207                                         kuid_t ouid;
 208 +                                       const char *target;
 209                                 } fs;
 210 +                               struct {
 211 +                                       int type, protocol;
 212 +                                       struct sock *peer_sk;
 213 +                                       void *addr;
 214 +                                       int addrlen;
 215 +                               } net;
 216                                 struct {
 217                                         int rlim;
 218                                         unsigned long max;
 219 diff --git a/security/apparmor/include/net.h b/security/apparmor/include/net.h
 220 new file mode 100644
 221 index 000000000000..140c8efcf364
 222 --- /dev/null
 223 +++ b/security/apparmor/include/net.h
 224 @@ -0,0 +1,114 @@
 225 +/*
 226 + * AppArmor security module
 227 + *
 228 + * This file contains AppArmor network mediation definitions.
 229 + *
 230 + * Copyright (C) 1998-2008 Novell/SUSE
 231 + * Copyright 2009-2017 Canonical Ltd.
 232 + *
 233 + * This program is free software; you can redistribute it and/or
 234 + * modify it under the terms of the GNU General Public License as
 235 + * published by the Free Software Foundation, version 2 of the
 236 + * License.
 237 + */
 238 +
 239 +#ifndef __AA_NET_H
 240 +#define __AA_NET_H
 241 +
 242 +#include <net/sock.h>
 243 +#include <linux/path.h>
 244 +
 245 +#include "apparmorfs.h"
 246 +#include "label.h"
 247 +#include "perms.h"
 248 +#include "policy.h"
 249 +
 250 +#define AA_MAY_SEND            AA_MAY_WRITE
 251 +#define AA_MAY_RECEIVE         AA_MAY_READ
 252 +
 253 +#define AA_MAY_SHUTDOWN                AA_MAY_DELETE
 254 +
 255 +#define AA_MAY_CONNECT         AA_MAY_OPEN
 256 +#define AA_MAY_ACCEPT          0x00100000
 257 +
 258 +#define AA_MAY_BIND            0x00200000
 259 +#define AA_MAY_LISTEN          0x00400000
 260 +
 261 +#define AA_MAY_SETOPT          0x01000000
 262 +#define AA_MAY_GETOPT          0x02000000
 263 +
 264 +#define NET_PERMS_MASK (AA_MAY_SEND | AA_MAY_RECEIVE | AA_MAY_CREATE |    \
 265 +                       AA_MAY_SHUTDOWN | AA_MAY_BIND | AA_MAY_LISTEN |   \
 266 +                       AA_MAY_CONNECT | AA_MAY_ACCEPT | AA_MAY_SETATTR | \
 267 +                       AA_MAY_GETATTR | AA_MAY_SETOPT | AA_MAY_GETOPT)
 268 +
 269 +#define NET_FS_PERMS (AA_MAY_SEND | AA_MAY_RECEIVE | AA_MAY_CREATE |   \
 270 +                     AA_MAY_SHUTDOWN | AA_MAY_CONNECT | AA_MAY_RENAME |\
 271 +                     AA_MAY_SETATTR | AA_MAY_GETATTR | AA_MAY_CHMOD |  \
 272 +                     AA_MAY_CHOWN | AA_MAY_CHGRP | AA_MAY_LOCK |       \
 273 +                     AA_MAY_MPROT)
 274 +
 275 +#define NET_PEER_MASK (AA_MAY_SEND | AA_MAY_RECEIVE | AA_MAY_CONNECT | \
 276 +                      AA_MAY_ACCEPT)
 277 +struct aa_sk_ctx {
 278 +       struct aa_label *label;
 279 +       struct aa_label *peer;
 280 +       struct path path;
 281 +};
 282 +
 283 +#define SK_CTX(X) ((X)->sk_security)
 284 +#define SOCK_ctx(X) SOCK_INODE(X)->i_security
 285 +#define DEFINE_AUDIT_NET(NAME, OP, SK, F, T, P)                                  \
 286 +       struct lsm_network_audit NAME ## _net = { .sk = (SK),             \
 287 +                                                 .family = (F)};         \
 288 +       DEFINE_AUDIT_DATA(NAME,                                           \
 289 +                         ((SK) && (F) != AF_UNIX) ? LSM_AUDIT_DATA_NET : \
 290 +                                                    LSM_AUDIT_DATA_NONE, \
 291 +                         OP);                                            \
 292 +       NAME.u.net = &(NAME ## _net);                                     \
 293 +       aad(&NAME)->net.type = (T);                                       \
 294 +       aad(&NAME)->net.protocol = (P)
 295 +
 296 +#define DEFINE_AUDIT_SK(NAME, OP, SK)                                  \
 297 +       DEFINE_AUDIT_NET(NAME, OP, SK, (SK)->sk_family, (SK)->sk_type,  \
 298 +                        (SK)->sk_protocol)
 299 +
 300 +/* struct aa_net - network confinement data
 301 + * @allow: basic network families permissions
 302 + * @audit: which network permissions to force audit
 303 + * @quiet: which network permissions to quiet rejects
 304 + */
 305 +struct aa_net {
 306 +       u16 allow[AF_MAX];
 307 +       u16 audit[AF_MAX];
 308 +       u16 quiet[AF_MAX];
 309 +};
 310 +
 311 +
 312 +extern struct aa_sfs_entry aa_sfs_entry_network[];
 313 +
 314 +void audit_net_cb(struct audit_buffer *ab, void *va);
 315 +int aa_profile_af_perm(struct aa_profile *profile, struct common_audit_data *sa,
 316 +                      u32 request, u16 family, int type);
 317 +int aa_af_perm(struct aa_label *label, const char *op, u32 request, u16 family,
 318 +              int type, int protocol);
 319 +static inline int aa_profile_af_sk_perm(struct aa_profile *profile,
 320 +                                       struct common_audit_data *sa,
 321 +                                       u32 request,
 322 +                                       struct sock *sk)
 323 +{
 324 +       return aa_profile_af_perm(profile, sa, request, sk->sk_family,
 325 +                                 sk->sk_type);
 326 +}
 327 +int aa_sk_perm(const char *op, u32 request, struct sock *sk);
 328 +
 329 +int aa_sock_file_perm(struct aa_label *label, const char *op, u32 request,
 330 +                     struct socket *sock);
 331 +
 332 +
 333 +static inline void aa_free_net_rules(struct aa_net *new)
 334 +{
 335 +       /* NOP */
 336 +}
 337 +
 338 +#endif /* __AA_NET_H */
 339 diff --git a/security/apparmor/include/perms.h b/security/apparmor/include/perms.h
 340 index d7b7e7115160..38aa6247d00f 100644
 341 --- a/security/apparmor/include/perms.h
 342 +++ b/security/apparmor/include/perms.h
 343 @@ -138,9 +138,10 @@ extern struct aa_perms allperms;
 344
 345
 346  void aa_perm_mask_to_str(char *str, const char *chrs, u32 mask);
 347 -void aa_audit_perm_names(struct audit_buffer *ab, const char **names, u32 mask);
 348 +void aa_audit_perm_names(struct audit_buffer *ab, const char * const *names,
 349 +                        u32 mask);
 350  void aa_audit_perm_mask(struct audit_buffer *ab, u32 mask, const char *chrs,
 351 -                       u32 chrsmask, const char **names, u32 namesmask);
 352 +                       u32 chrsmask, const char * const *names, u32 namesmask);
 353  void aa_apply_modes_to_perms(struct aa_profile *profile,
 354                              struct aa_perms *perms);
 355  void aa_compute_perms(struct aa_dfa *dfa, unsigned int state,
 356 diff --git a/security/apparmor/include/policy.h b/security/apparmor/include/policy.h
 357 index 17fe41a9cac3..4364088a0b9e 100644
 358 --- a/security/apparmor/include/policy.h
 359 +++ b/security/apparmor/include/policy.h
 360 @@ -30,6 +30,7 @@
 361  #include "file.h"
 362  #include "lib.h"
 363  #include "label.h"
 364 +#include "net.h"
 365  #include "perms.h"
 366  #include "resource.h"
 367
 368 @@ -111,6 +112,7 @@ struct aa_data {
 369   * @policy: general match rules governing policy
 370   * @file: The set of rules governing basic file access and domain transitions
 371   * @caps: capabilities for the profile
 372 + * @net: network controls for the profile
 373   * @rlimits: rlimits for the profile
 374   *
 375   * @dents: dentries for the profiles file entries in apparmorfs
 376 @@ -148,6 +150,7 @@ struct aa_profile {
 377         struct aa_policydb policy;
 378         struct aa_file_rules file;
 379         struct aa_caps caps;
 380 +       struct aa_net net;
 381         struct aa_rlimit rlimits;
 382
 383         struct aa_loaddata *rawdata;
 384 @@ -220,6 +223,16 @@ static inline unsigned int PROFILE_MEDIATES_SAFE(struct aa_profile *profile,
 385         return 0;
 386  }
 387
 388 +static inline unsigned int PROFILE_MEDIATES_AF(struct aa_profile *profile,
 389 +                                              u16 AF) {
 390 +       unsigned int state = PROFILE_MEDIATES(profile, AA_CLASS_NET);
 391 +       u16 be_af = cpu_to_be16(AF);
 392 +
 393 +       if (!state)
 394 +               return 0;
 395 +       return aa_dfa_match_len(profile->policy.dfa, state, (char *) &be_af, 2);
 396 +}
 397 +
 398  /**
 399   * aa_get_profile - increment refcount on profile @p
 400   * @p: profile  (MAYBE NULL)
 401 diff --git a/security/apparmor/lib.c b/security/apparmor/lib.c
 402 index 4d5e98e49d5e..068a9f471f77 100644
 403 --- a/security/apparmor/lib.c
 404 +++ b/security/apparmor/lib.c
 405 @@ -211,7 +211,8 @@ void aa_perm_mask_to_str(char *str, const char *chrs, u32 mask)
 406         *str = '\0';
 407  }
 408
 409 -void aa_audit_perm_names(struct audit_buffer *ab, const char **names, u32 mask)
 410 +void aa_audit_perm_names(struct audit_buffer *ab, const char * const *names,
 411 +                        u32 mask)
 412  {
 413         const char *fmt = "%s";
 414         unsigned int i, perm = 1;
 415 @@ -229,7 +230,7 @@ void aa_audit_perm_names(struct audit_buffer *ab, const char **names, u32 mask)
 416  }
 417
 418  void aa_audit_perm_mask(struct audit_buffer *ab, u32 mask, const char *chrs,
 419 -                       u32 chrsmask, const char **names, u32 namesmask)
 420 +                       u32 chrsmask, const char * const *names, u32 namesmask)
 421  {
 422         char str[33];
 423
 424 diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
 425 index 9a65eeaf7dfa..0cd717614fd0 100644
 426 --- a/security/apparmor/lsm.c
 427 +++ b/security/apparmor/lsm.c
 428 @@ -33,6 +33,7 @@
 429  #include "include/context.h"
 430  #include "include/file.h"
 431  #include "include/ipc.h"
 432 +#include "include/net.h"
 433  #include "include/path.h"
 434  #include "include/label.h"
 435  #include "include/policy.h"
 436 @@ -736,6 +737,368 @@ static int apparmor_task_kill(struct task_struct *target, struct siginfo *info,
 437         return error;
 438  }
 439
 440 +/**
 441 + * apparmor_sk_alloc_security - allocate and attach the sk_security field
 442 + */
 443 +static int apparmor_sk_alloc_security(struct sock *sk, int family, gfp_t flags)
 444 +{
 445 +       struct aa_sk_ctx *ctx;
 446 +
 447 +       ctx = kzalloc(sizeof(*ctx), flags);
 448 +       if (!ctx)
 449 +               return -ENOMEM;
 450 +
 451 +       SK_CTX(sk) = ctx;
 452 +
 453 +       return 0;
 454 +}
 455 +
 456 +/**
 457 + * apparmor_sk_free_security - free the sk_security field
 458 + */
 459 +static void apparmor_sk_free_security(struct sock *sk)
 460 +{
 461 +       struct aa_sk_ctx *ctx = SK_CTX(sk);
 462 +
 463 +       SK_CTX(sk) = NULL;
 464 +       aa_put_label(ctx->label);
 465 +       aa_put_label(ctx->peer);
 466 +       path_put(&ctx->path);
 467 +       kfree(ctx);
 468 +}
 469 +
 470 +/**
 471 + * apparmor_clone_security - clone the sk_security field
 472 + */
 473 +static void apparmor_sk_clone_security(const struct sock *sk,
 474 +                                      struct sock *newsk)
 475 +{
 476 +       struct aa_sk_ctx *ctx = SK_CTX(sk);
 477 +       struct aa_sk_ctx *new = SK_CTX(newsk);
 478 +
 479 +       new->label = aa_get_label(ctx->label);
 480 +       new->peer = aa_get_label(ctx->peer);
 481 +       new->path = ctx->path;
 482 +       path_get(&new->path);
 483 +}
 484 +
 485 +static int aa_sock_create_perm(struct aa_label *label, int family, int type,
 486 +                              int protocol)
 487 +{
 488 +       AA_BUG(!label);
 489 +       AA_BUG(in_interrupt());
 490 +
 491 +       return aa_af_perm(label, OP_CREATE, AA_MAY_CREATE, family, type,
 492 +                         protocol);
 493 +}
 494 +
 495 +
 496 +/**
 497 + * apparmor_socket_create - check perms before creating a new socket
 498 + */
 499 +static int apparmor_socket_create(int family, int type, int protocol, int kern)
 500 +{
 501 +       struct aa_label *label;
 502 +       int error = 0;
 503 +
 504 +       label = begin_current_label_crit_section();
 505 +       if (!(kern || unconfined(label)))
 506 +               error = aa_sock_create_perm(label, family, type, protocol);
 507 +       end_current_label_crit_section(label);
 508 +
 509 +       return error;
 510 +}
 511 +
 512 +/**
 513 + * apparmor_socket_post_create - setup the per-socket security struct
 514 + *
 515 + * Note:
 516 + * -   kernel sockets currently labeled unconfined but we may want to
 517 + *     move to a special kernel label
 518 + * -   socket may not have sk here if created with sock_create_lite or
 519 + *     sock_alloc. These should be accept cases which will be handled in
 520 + *     sock_graft.
 521 + */
 522 +static int apparmor_socket_post_create(struct socket *sock, int family,
 523 +                                      int type, int protocol, int kern)
 524 +{
 525 +       struct aa_label *label;
 526 +
 527 +       if (kern) {
 528 +               struct aa_ns *ns = aa_get_current_ns();
 529 +
 530 +               label = aa_get_label(ns_unconfined(ns));
 531 +               aa_put_ns(ns);
 532 +       } else
 533 +               label = aa_get_current_label();
 534 +
 535 +       if (sock->sk) {
 536 +               struct aa_sk_ctx *ctx = SK_CTX(sock->sk);
 537 +
 538 +               aa_put_label(ctx->label);
 539 +               ctx->label = aa_get_label(label);
 540 +       }
 541 +       aa_put_label(label);
 542 +
 543 +       return 0;
 544 +}
 545 +
 546 +/**
 547 + * apparmor_socket_bind - check perms before bind addr to socket
 548 + */
 549 +static int apparmor_socket_bind(struct socket *sock,
 550 +                               struct sockaddr *address, int addrlen)
 551 +{
 552 +       AA_BUG(!sock);
 553 +       AA_BUG(!sock->sk);
 554 +       AA_BUG(!address);
 555 +       AA_BUG(in_interrupt());
 556 +
 557 +       return aa_sk_perm(OP_BIND, AA_MAY_BIND, sock->sk);
 558 +}
 559 +
 560 +/**
 561 + * apparmor_socket_connect - check perms before connecting @sock to @address
 562 + */
 563 +static int apparmor_socket_connect(struct socket *sock,
 564 +                                  struct sockaddr *address, int addrlen)
 565 +{
 566 +       AA_BUG(!sock);
 567 +       AA_BUG(!sock->sk);
 568 +       AA_BUG(!address);
 569 +       AA_BUG(in_interrupt());
 570 +
 571 +       return aa_sk_perm(OP_CONNECT, AA_MAY_CONNECT, sock->sk);
 572 +}
 573 +
 574 +/**
 575 + * apparmor_socket_list - check perms before allowing listen
 576 + */
 577 +static int apparmor_socket_listen(struct socket *sock, int backlog)
 578 +{
 579 +       AA_BUG(!sock);
 580 +       AA_BUG(!sock->sk);
 581 +       AA_BUG(in_interrupt());
 582 +
 583 +       return aa_sk_perm(OP_LISTEN, AA_MAY_LISTEN, sock->sk);
 584 +}
 585 +
 586 +/**
 587 + * apparmor_socket_accept - check perms before accepting a new connection.
 588 + *
 589 + * Note: while @newsock is created and has some information, the accept
 590 + *       has not been done.
 591 + */
 592 +static int apparmor_socket_accept(struct socket *sock, struct socket *newsock)
 593 +{
 594 +       AA_BUG(!sock);
 595 +       AA_BUG(!sock->sk);
 596 +       AA_BUG(!newsock);
 597 +       AA_BUG(in_interrupt());
 598 +
 599 +       return aa_sk_perm(OP_ACCEPT, AA_MAY_ACCEPT, sock->sk);
 600 +}
 601 +
 602 +static int aa_sock_msg_perm(const char *op, u32 request, struct socket *sock,
 603 +                           struct msghdr *msg, int size)
 604 +{
 605 +       AA_BUG(!sock);
 606 +       AA_BUG(!sock->sk);
 607 +       AA_BUG(!msg);
 608 +       AA_BUG(in_interrupt());
 609 +
 610 +       return aa_sk_perm(op, request, sock->sk);
 611 +}
 612 +
 613 +/**
 614 + * apparmor_socket_sendmsg - check perms before sending msg to another socket
 615 + */
 616 +static int apparmor_socket_sendmsg(struct socket *sock,
 617 +                                  struct msghdr *msg, int size)
 618 +{
 619 +       return aa_sock_msg_perm(OP_SENDMSG, AA_MAY_SEND, sock, msg, size);
 620 +}
 621 +
 622 +/**
 623 + * apparmor_socket_recvmsg - check perms before receiving a message
 624 + */
 625 +static int apparmor_socket_recvmsg(struct socket *sock,
 626 +                                  struct msghdr *msg, int size, int flags)
 627 +{
 628 +       return aa_sock_msg_perm(OP_RECVMSG, AA_MAY_RECEIVE, sock, msg, size);
 629 +}
 630 +
 631 +/* revaliation, get/set attr, shutdown */
 632 +static int aa_sock_perm(const char *op, u32 request, struct socket *sock)
 633 +{
 634 +       AA_BUG(!sock);
 635 +       AA_BUG(!sock->sk);
 636 +       AA_BUG(in_interrupt());
 637 +
 638 +       return aa_sk_perm(op, request, sock->sk);
 639 +}
 640 +
 641 +/**
 642 + * apparmor_socket_getsockname - check perms before getting the local address
 643 + */
 644 +static int apparmor_socket_getsockname(struct socket *sock)
 645 +{
 646 +       return aa_sock_perm(OP_GETSOCKNAME, AA_MAY_GETATTR, sock);
 647 +}
 648 +
 649 +/**
 650 + * apparmor_socket_getpeername - check perms before getting remote address
 651 + */
 652 +static int apparmor_socket_getpeername(struct socket *sock)
 653 +{
 654 +       return aa_sock_perm(OP_GETPEERNAME, AA_MAY_GETATTR, sock);
 655 +}
 656 +
 657 +/* revaliation, get/set attr, opt */
 658 +static int aa_sock_opt_perm(const char *op, u32 request, struct socket *sock,
 659 +                           int level, int optname)
 660 +{
 661 +       AA_BUG(!sock);
 662 +       AA_BUG(!sock->sk);
 663 +       AA_BUG(in_interrupt());
 664 +
 665 +       return aa_sk_perm(op, request, sock->sk);
 666 +}
 667 +
 668 +/**
 669 + * apparmor_getsockopt - check perms before getting socket options
 670 + */
 671 +static int apparmor_socket_getsockopt(struct socket *sock, int level,
 672 +                                     int optname)
 673 +{
 674 +       return aa_sock_opt_perm(OP_GETSOCKOPT, AA_MAY_GETOPT, sock,
 675 +                               level, optname);
 676 +}
 677 +
 678 +/**
 679 + * apparmor_setsockopt - check perms before setting socket options
 680 + */
 681 +static int apparmor_socket_setsockopt(struct socket *sock, int level,
 682 +                                     int optname)
 683 +{
 684 +       return aa_sock_opt_perm(OP_SETSOCKOPT, AA_MAY_SETOPT, sock,
 685 +                               level, optname);
 686 +}
 687 +
 688 +/**
 689 + * apparmor_socket_shutdown - check perms before shutting down @sock conn
 690 + */
 691 +static int apparmor_socket_shutdown(struct socket *sock, int how)
 692 +{
 693 +       return aa_sock_perm(OP_SHUTDOWN, AA_MAY_SHUTDOWN, sock);
 694 +}
 695 +
 696 +/**
 697 + * apparmor_socket_sock_recv_skb - check perms before associating skb to sk
 698 + *
 699 + * Note: can not sleep may be called with locks held
 700 + *
 701 + * dont want protocol specific in __skb_recv_datagram()
 702 + * to deny an incoming connection  socket_sock_rcv_skb()
 703 + */
 704 +static int apparmor_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
 705 +{
 706 +       return 0;
 707 +}
 708 +
 709 +
 710 +static struct aa_label *sk_peer_label(struct sock *sk)
 711 +{
 712 +       struct aa_sk_ctx *ctx = SK_CTX(sk);
 713 +
 714 +       if (ctx->peer)
 715 +               return ctx->peer;
 716 +
 717 +       return ERR_PTR(-ENOPROTOOPT);
 718 +}
 719 +
 720 +/**
 721 + * apparmor_socket_getpeersec_stream - get security context of peer
 722 + *
 723 + * Note: for tcp only valid if using ipsec or cipso on lan
 724 + */
 725 +static int apparmor_socket_getpeersec_stream(struct socket *sock,
 726 +                                            char __user *optval,
 727 +                                            int __user *optlen,
 728 +                                            unsigned int len)
 729 +{
 730 +       char *name;
 731 +       int slen, error = 0;
 732 +       struct aa_label *label;
 733 +       struct aa_label *peer;
 734 +
 735 +       label = begin_current_label_crit_section();
 736 +       peer = sk_peer_label(sock->sk);
 737 +       if (IS_ERR(peer)) {
 738 +               error = PTR_ERR(peer);
 739 +               goto done;
 740 +       }
 741 +       slen = aa_label_asxprint(&name, labels_ns(label), peer,
 742 +                                FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
 743 +                                FLAG_HIDDEN_UNCONFINED, GFP_KERNEL);
 744 +       /* don't include terminating \0 in slen, it breaks some apps */
 745 +       if (slen < 0) {
 746 +               error = -ENOMEM;
 747 +       } else {
 748 +               if (slen > len) {
 749 +                       error = -ERANGE;
 750 +               } else if (copy_to_user(optval, name, slen)) {
 751 +                       error = -EFAULT;
 752 +                       goto out;
 753 +               }
 754 +               if (put_user(slen, optlen))
 755 +                       error = -EFAULT;
 756 +out:
 757 +               kfree(name);
 758 +
 759 +       }
 760 +
 761 +done:
 762 +       end_current_label_crit_section(label);
 763 +
 764 +       return error;
 765 +}
 766 +
 767 +/**
 768 + * apparmor_socket_getpeersec_dgram - get security label of packet
 769 + * @sock: the peer socket
 770 + * @skb: packet data
 771 + * @secid: pointer to where to put the secid of the packet
 772 + *
 773 + * Sets the netlabel socket state on sk from parent
 774 + */
 775 +static int apparmor_socket_getpeersec_dgram(struct socket *sock,
 776 +                                           struct sk_buff *skb, u32 *secid)
 777 +
 778 +{
 779 +       /* TODO: requires secid support */
 780 +       return -ENOPROTOOPT;
 781 +}
 782 +
 783 +/**
 784 + * apparmor_sock_graft - Initialize newly created socket
 785 + * @sk: child sock
 786 + * @parent: parent socket
 787 + *
 788 + * Note: could set off of SOCK_CTX(parent) but need to track inode and we can
 789 + *       just set sk security information off of current creating process label
 790 + *       Labeling of sk for accept case - probably should be sock based
 791 + *       instead of task, because of the case where an implicitly labeled
 792 + *       socket is shared by different tasks.
 793 + */
 794 +static void apparmor_sock_graft(struct sock *sk, struct socket *parent)
 795 +{
 796 +       struct aa_sk_ctx *ctx = SK_CTX(sk);
 797 +
 798 +       if (!ctx->label)
 799 +               ctx->label = aa_get_current_label();
 800 +}
 801 +
 802  static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = {
 803         LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check),
 804         LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme),
 805 @@ -770,6 +1133,30 @@ static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = {
 806         LSM_HOOK_INIT(getprocattr, apparmor_getprocattr),
 807         LSM_HOOK_INIT(setprocattr, apparmor_setprocattr),
 808
 809 +       LSM_HOOK_INIT(sk_alloc_security, apparmor_sk_alloc_security),
 810 +       LSM_HOOK_INIT(sk_free_security, apparmor_sk_free_security),
 811 +       LSM_HOOK_INIT(sk_clone_security, apparmor_sk_clone_security),
 812 +
 813 +       LSM_HOOK_INIT(socket_create, apparmor_socket_create),
 814 +       LSM_HOOK_INIT(socket_post_create, apparmor_socket_post_create),
 815 +       LSM_HOOK_INIT(socket_bind, apparmor_socket_bind),
 816 +       LSM_HOOK_INIT(socket_connect, apparmor_socket_connect),
 817 +       LSM_HOOK_INIT(socket_listen, apparmor_socket_listen),
 818 +       LSM_HOOK_INIT(socket_accept, apparmor_socket_accept),
 819 +       LSM_HOOK_INIT(socket_sendmsg, apparmor_socket_sendmsg),
 820 +       LSM_HOOK_INIT(socket_recvmsg, apparmor_socket_recvmsg),
 821 +       LSM_HOOK_INIT(socket_getsockname, apparmor_socket_getsockname),
 822 +       LSM_HOOK_INIT(socket_getpeername, apparmor_socket_getpeername),
 823 +       LSM_HOOK_INIT(socket_getsockopt, apparmor_socket_getsockopt),
 824 +       LSM_HOOK_INIT(socket_setsockopt, apparmor_socket_setsockopt),
 825 +       LSM_HOOK_INIT(socket_shutdown, apparmor_socket_shutdown),
 826 +       LSM_HOOK_INIT(socket_sock_rcv_skb, apparmor_socket_sock_rcv_skb),
 827 +       LSM_HOOK_INIT(socket_getpeersec_stream,
 828 +                     apparmor_socket_getpeersec_stream),
 829 +       LSM_HOOK_INIT(socket_getpeersec_dgram,
 830 +                     apparmor_socket_getpeersec_dgram),
 831 +       LSM_HOOK_INIT(sock_graft, apparmor_sock_graft),
 832 +
 833         LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank),
 834         LSM_HOOK_INIT(cred_free, apparmor_cred_free),
 835         LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare),
 836 diff --git a/security/apparmor/net.c b/security/apparmor/net.c
 837 new file mode 100644
 838 index 000000000000..33d54435f8d6
 839 --- /dev/null
 840 +++ b/security/apparmor/net.c
 841 @@ -0,0 +1,184 @@
 842 +/*
 843 + * AppArmor security module
 844 + *
 845 + * This file contains AppArmor network mediation
 846 + *
 847 + * Copyright (C) 1998-2008 Novell/SUSE
 848 + * Copyright 2009-2017 Canonical Ltd.
 849 + *
 850 + * This program is free software; you can redistribute it and/or
 851 + * modify it under the terms of the GNU General Public License as
 852 + * published by the Free Software Foundation, version 2 of the
 853 + * License.
 854 + */
 855 +
 856 +#include "include/apparmor.h"
 857 +#include "include/audit.h"
 858 +#include "include/context.h"
 859 +#include "include/label.h"
 860 +#include "include/net.h"
 861 +#include "include/policy.h"
 862 +
 863 +#include "net_names.h"
 864 +
 865 +
 866 +struct aa_sfs_entry aa_sfs_entry_network[] = {
 867 +       AA_SFS_FILE_STRING("af_mask",   AA_SFS_AF_MASK),
 868 +       { }
 869 +};
 870 +
 871 +static const char * const net_mask_names[] = {
 872 +       "unknown",
 873 +       "send",
 874 +       "receive",
 875 +       "unknown",
 876 +
 877 +       "create",
 878 +       "shutdown",
 879 +       "connect",
 880 +       "unknown",
 881 +
 882 +       "setattr",
 883 +       "getattr",
 884 +       "setcred",
 885 +       "getcred",
 886 +
 887 +       "chmod",
 888 +       "chown",
 889 +       "chgrp",
 890 +       "lock",
 891 +
 892 +       "mmap",
 893 +       "mprot",
 894 +       "unknown",
 895 +       "unknown",
 896 +
 897 +       "accept",
 898 +       "bind",
 899 +       "listen",
 900 +       "unknown",
 901 +
 902 +       "setopt",
 903 +       "getopt",
 904 +       "unknown",
 905 +       "unknown",
 906 +
 907 +       "unknown",
 908 +       "unknown",
 909 +       "unknown",
 910 +       "unknown",
 911 +};
 912 +
 913 +
 914 +/* audit callback for net specific fields */
 915 +void audit_net_cb(struct audit_buffer *ab, void *va)
 916 +{
 917 +       struct common_audit_data *sa = va;
 918 +
 919 +       audit_log_format(ab, " family=");
 920 +       if (address_family_names[sa->u.net->family])
 921 +               audit_log_string(ab, address_family_names[sa->u.net->family]);
 922 +       else
 923 +               audit_log_format(ab, "\"unknown(%d)\"", sa->u.net->family);
 924 +       audit_log_format(ab, " sock_type=");
 925 +       if (sock_type_names[aad(sa)->net.type])
 926 +               audit_log_string(ab, sock_type_names[aad(sa)->net.type]);
 927 +       else
 928 +               audit_log_format(ab, "\"unknown(%d)\"", aad(sa)->net.type);
 929 +       audit_log_format(ab, " protocol=%d", aad(sa)->net.protocol);
 930 +
 931 +       if (aad(sa)->request & NET_PERMS_MASK) {
 932 +               audit_log_format(ab, " requested_mask=");
 933 +               aa_audit_perm_mask(ab, aad(sa)->request, NULL, 0,
 934 +                                  net_mask_names, NET_PERMS_MASK);
 935 +
 936 +               if (aad(sa)->denied & NET_PERMS_MASK) {
 937 +                       audit_log_format(ab, " denied_mask=");
 938 +                       aa_audit_perm_mask(ab, aad(sa)->denied, NULL, 0,
 939 +                                          net_mask_names, NET_PERMS_MASK);
 940 +               }
 941 +       }
 942 +       if (aad(sa)->peer) {
 943 +               audit_log_format(ab, " peer=");
 944 +               aa_label_xaudit(ab, labels_ns(aad(sa)->label), aad(sa)->peer,
 945 +                               FLAGS_NONE, GFP_ATOMIC);
 946 +       }
 947 +}
 948 +
 949 +
 950 +/* Generic af perm */
 951 +int aa_profile_af_perm(struct aa_profile *profile, struct common_audit_data *sa,
 952 +                      u32 request, u16 family, int type)
 953 +{
 954 +       struct aa_perms perms = { };
 955 +
 956 +       AA_BUG(family >= AF_MAX);
 957 +       AA_BUG(type < 0 || type >= SOCK_MAX);
 958 +
 959 +       if (profile_unconfined(profile))
 960 +               return 0;
 961 +
 962 +       perms.allow = (profile->net.allow[family] & (1 << type)) ?
 963 +               ALL_PERMS_MASK : 0;
 964 +       perms.audit = (profile->net.audit[family] & (1 << type)) ?
 965 +               ALL_PERMS_MASK : 0;
 966 +       perms.quiet = (profile->net.quiet[family] & (1 << type)) ?
 967 +               ALL_PERMS_MASK : 0;
 968 +       aa_apply_modes_to_perms(profile, &perms);
 969 +
 970 +       return aa_check_perms(profile, &perms, request, sa, audit_net_cb);
 971 +}
 972 +
 973 +int aa_af_perm(struct aa_label *label, const char *op, u32 request, u16 family,
 974 +              int type, int protocol)
 975 +{
 976 +       struct aa_profile *profile;
 977 +       DEFINE_AUDIT_NET(sa, op, NULL, family, type, protocol);
 978 +
 979 +       return fn_for_each_confined(label, profile,
 980 +                       aa_profile_af_perm(profile, &sa, request, family,
 981 +                                          type));
 982 +}
 983 +
 984 +static int aa_label_sk_perm(struct aa_label *label, const char *op, u32 request,
 985 +                           struct sock *sk)
 986 +{
 987 +       struct aa_profile *profile;
 988 +       DEFINE_AUDIT_SK(sa, op, sk);
 989 +
 990 +       AA_BUG(!label);
 991 +       AA_BUG(!sk);
 992 +
 993 +       if (unconfined(label))
 994 +               return 0;
 995 +
 996 +       return fn_for_each_confined(label, profile,
 997 +                       aa_profile_af_sk_perm(profile, &sa, request, sk));
 998 +}
 999 +
1000 +int aa_sk_perm(const char *op, u32 request, struct sock *sk)
1001 +{
1002 +       struct aa_label *label;
1003 +       int error;
1004 +
1005 +       AA_BUG(!sk);
1006 +       AA_BUG(in_interrupt());
1007 +
1008 +       /* TODO: switch to begin_current_label ???? */
1009 +       label = begin_current_label_crit_section();
1010 +       error = aa_label_sk_perm(label, op, request, sk);
1011 +       end_current_label_crit_section(label);
1012 +
1013 +       return error;
1014 +}
1015 +
1016 +
1017 +int aa_sock_file_perm(struct aa_label *label, const char *op, u32 request,
1018 +                     struct socket *sock)
1019 +{
1020 +       AA_BUG(!label);
1021 +       AA_BUG(!sock);
1022 +       AA_BUG(!sock->sk);
1023 +
1024 +       return aa_label_sk_perm(label, op, request, sock->sk);
1025 +}
1026 diff --git a/security/apparmor/policy_unpack.c b/security/apparmor/policy_unpack.c
1027 index 59a1a25b7d43..68b168e8f499 100644
1028 --- a/security/apparmor/policy_unpack.c
1029 +++ b/security/apparmor/policy_unpack.c
1030 @@ -275,6 +275,19 @@ static bool unpack_nameX(struct aa_ext *e, enum aa_code code, const char *name)
1031         return 0;
1032  }
1033
1034 +static bool unpack_u16(struct aa_ext *e, u16 *data, const char *name)
1035 +{
1036 +       if (unpack_nameX(e, AA_U16, name)) {
1037 +               if (!inbounds(e, sizeof(u16)))
1038 +                       return 0;
1039 +               if (data)
1040 +                       *data = le16_to_cpu(get_unaligned((__le16 *) e->pos));
1041 +               e->pos += sizeof(u16);
1042 +               return 1;
1043 +       }
1044 +       return 0;
1045 +}
1046 +
1047  static bool unpack_u32(struct aa_ext *e, u32 *data, const char *name)
1048  {
1049         if (unpack_nameX(e, AA_U32, name)) {
1050 @@ -584,7 +597,7 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
1051         struct aa_profile *profile = NULL;
1052         const char *tmpname, *tmpns = NULL, *name = NULL;
1053         const char *info = "failed to unpack profile";
1054 -       size_t ns_len;
1055 +       size_t size = 0, ns_len;
1056         struct rhashtable_params params = { 0 };
1057         char *key = NULL;
1058         struct aa_data *data;
1059 @@ -717,6 +730,38 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
1060                 goto fail;
1061         }
1062
1063 +       size = unpack_array(e, "net_allowed_af");
1064 +       if (size) {
1065 +
1066 +               for (i = 0; i < size; i++) {
1067 +                       /* discard extraneous rules that this kernel will
1068 +                        * never request
1069 +                        */
1070 +                       if (i >= AF_MAX) {
1071 +                               u16 tmp;
1072 +
1073 +                               if (!unpack_u16(e, &tmp, NULL) ||
1074 +                                   !unpack_u16(e, &tmp, NULL) ||
1075 +                                   !unpack_u16(e, &tmp, NULL))
1076 +                                       goto fail;
1077 +                               continue;
1078 +                       }
1079 +                       if (!unpack_u16(e, &profile->net.allow[i], NULL))
1080 +                               goto fail;
1081 +                       if (!unpack_u16(e, &profile->net.audit[i], NULL))
1082 +                               goto fail;
1083 +                       if (!unpack_u16(e, &profile->net.quiet[i], NULL))
1084 +                               goto fail;
1085 +               }
1086 +               if (!unpack_nameX(e, AA_ARRAYEND, NULL))
1087 +                       goto fail;
1088 +       }
1089 +       if (VERSION_LT(e->version, v7)) {
1090 +               /* pre v7 policy always allowed these */
1091 +               profile->net.allow[AF_UNIX] = 0xffff;
1092 +               profile->net.allow[AF_NETLINK] = 0xffff;
1093 +       }
1094 +
1095         if (unpack_nameX(e, AA_STRUCT, "policydb")) {
1096                 /* generic policy dfa - optional and may be NULL */
1097                 info = "failed to unpack policydb";
1098 --
1099 2.14.1
1100