nlmsgtab.c 5.9 KB

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  1. /*
  2. * Netlink message type permission tables, for user generated messages.
  3. *
  4. * Author: James Morris <jmorris@redhat.com>
  5. *
  6. * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
  7. *
  8. * This program is free software; you can redistribute it and/or modify
  9. * it under the terms of the GNU General Public License version 2,
  10. * as published by the Free Software Foundation.
  11. */
  12. #include <linux/types.h>
  13. #include <linux/kernel.h>
  14. #include <linux/skbuff.h>
  15. #include <linux/netlink.h>
  16. #include <linux/rtnetlink.h>
  17. #include <linux/if.h>
  18. #include <linux/netfilter_ipv4/ip_queue.h>
  19. #include <linux/inet_diag.h>
  20. #include <linux/xfrm.h>
  21. #include <linux/audit.h>
  22. #include "flask.h"
  23. #include "av_permissions.h"
  24. struct nlmsg_perm
  25. {
  26. u16 nlmsg_type;
  27. u32 perm;
  28. };
  29. static struct nlmsg_perm nlmsg_route_perms[] =
  30. {
  31. { RTM_NEWLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  32. { RTM_DELLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  33. { RTM_GETLINK, NETLINK_ROUTE_SOCKET__NLMSG_READ },
  34. { RTM_SETLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  35. { RTM_NEWADDR, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  36. { RTM_DELADDR, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  37. { RTM_GETADDR, NETLINK_ROUTE_SOCKET__NLMSG_READ },
  38. { RTM_NEWROUTE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  39. { RTM_DELROUTE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  40. { RTM_GETROUTE, NETLINK_ROUTE_SOCKET__NLMSG_READ },
  41. { RTM_NEWNEIGH, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  42. { RTM_DELNEIGH, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  43. { RTM_GETNEIGH, NETLINK_ROUTE_SOCKET__NLMSG_READ },
  44. { RTM_NEWRULE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  45. { RTM_DELRULE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  46. { RTM_GETRULE, NETLINK_ROUTE_SOCKET__NLMSG_READ },
  47. { RTM_NEWQDISC, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  48. { RTM_DELQDISC, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  49. { RTM_GETQDISC, NETLINK_ROUTE_SOCKET__NLMSG_READ },
  50. { RTM_NEWTCLASS, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  51. { RTM_DELTCLASS, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  52. { RTM_GETTCLASS, NETLINK_ROUTE_SOCKET__NLMSG_READ },
  53. { RTM_NEWTFILTER, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  54. { RTM_DELTFILTER, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  55. { RTM_GETTFILTER, NETLINK_ROUTE_SOCKET__NLMSG_READ },
  56. { RTM_NEWACTION, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  57. { RTM_DELACTION, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  58. { RTM_GETACTION, NETLINK_ROUTE_SOCKET__NLMSG_READ },
  59. { RTM_NEWPREFIX, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  60. { RTM_GETMULTICAST, NETLINK_ROUTE_SOCKET__NLMSG_READ },
  61. { RTM_GETANYCAST, NETLINK_ROUTE_SOCKET__NLMSG_READ },
  62. { RTM_GETNEIGHTBL, NETLINK_ROUTE_SOCKET__NLMSG_READ },
  63. { RTM_SETNEIGHTBL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
  64. };
  65. static struct nlmsg_perm nlmsg_firewall_perms[] =
  66. {
  67. { IPQM_MODE, NETLINK_FIREWALL_SOCKET__NLMSG_WRITE },
  68. { IPQM_VERDICT, NETLINK_FIREWALL_SOCKET__NLMSG_WRITE },
  69. };
  70. static struct nlmsg_perm nlmsg_tcpdiag_perms[] =
  71. {
  72. { TCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
  73. { DCCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ },
  74. };
  75. static struct nlmsg_perm nlmsg_xfrm_perms[] =
  76. {
  77. { XFRM_MSG_NEWSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  78. { XFRM_MSG_DELSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  79. { XFRM_MSG_GETSA, NETLINK_XFRM_SOCKET__NLMSG_READ },
  80. { XFRM_MSG_NEWPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  81. { XFRM_MSG_DELPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  82. { XFRM_MSG_GETPOLICY, NETLINK_XFRM_SOCKET__NLMSG_READ },
  83. { XFRM_MSG_ALLOCSPI, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  84. { XFRM_MSG_ACQUIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  85. { XFRM_MSG_EXPIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  86. { XFRM_MSG_UPDPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  87. { XFRM_MSG_UPDSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  88. { XFRM_MSG_POLEXPIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  89. { XFRM_MSG_FLUSHSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  90. { XFRM_MSG_FLUSHPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  91. { XFRM_MSG_NEWAE, NETLINK_XFRM_SOCKET__NLMSG_WRITE },
  92. { XFRM_MSG_GETAE, NETLINK_XFRM_SOCKET__NLMSG_READ },
  93. };
  94. static struct nlmsg_perm nlmsg_audit_perms[] =
  95. {
  96. { AUDIT_GET, NETLINK_AUDIT_SOCKET__NLMSG_READ },
  97. { AUDIT_SET, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
  98. { AUDIT_LIST, NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
  99. { AUDIT_ADD, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
  100. { AUDIT_DEL, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
  101. { AUDIT_LIST_RULES, NETLINK_AUDIT_SOCKET__NLMSG_READPRIV },
  102. { AUDIT_ADD_RULE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
  103. { AUDIT_DEL_RULE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE },
  104. { AUDIT_USER, NETLINK_AUDIT_SOCKET__NLMSG_RELAY },
  105. { AUDIT_SIGNAL_INFO, NETLINK_AUDIT_SOCKET__NLMSG_READ },
  106. };
  107. static int nlmsg_perm(u16 nlmsg_type, u32 *perm, struct nlmsg_perm *tab, size_t tabsize)
  108. {
  109. int i, err = -EINVAL;
  110. for (i = 0; i < tabsize/sizeof(struct nlmsg_perm); i++)
  111. if (nlmsg_type == tab[i].nlmsg_type) {
  112. *perm = tab[i].perm;
  113. err = 0;
  114. break;
  115. }
  116. return err;
  117. }
  118. int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm)
  119. {
  120. int err = 0;
  121. switch (sclass) {
  122. case SECCLASS_NETLINK_ROUTE_SOCKET:
  123. err = nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms,
  124. sizeof(nlmsg_route_perms));
  125. break;
  126. case SECCLASS_NETLINK_FIREWALL_SOCKET:
  127. case SECCLASS_NETLINK_IP6FW_SOCKET:
  128. err = nlmsg_perm(nlmsg_type, perm, nlmsg_firewall_perms,
  129. sizeof(nlmsg_firewall_perms));
  130. break;
  131. case SECCLASS_NETLINK_TCPDIAG_SOCKET:
  132. err = nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms,
  133. sizeof(nlmsg_tcpdiag_perms));
  134. break;
  135. case SECCLASS_NETLINK_XFRM_SOCKET:
  136. err = nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms,
  137. sizeof(nlmsg_xfrm_perms));
  138. break;
  139. case SECCLASS_NETLINK_AUDIT_SOCKET:
  140. if ((nlmsg_type >= AUDIT_FIRST_USER_MSG &&
  141. nlmsg_type <= AUDIT_LAST_USER_MSG) ||
  142. (nlmsg_type >= AUDIT_FIRST_USER_MSG2 &&
  143. nlmsg_type <= AUDIT_LAST_USER_MSG2)) {
  144. *perm = NETLINK_AUDIT_SOCKET__NLMSG_RELAY;
  145. } else {
  146. err = nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms,
  147. sizeof(nlmsg_audit_perms));
  148. }
  149. break;
  150. /* No messaging from userspace, or class unknown/unhandled */
  151. default:
  152. err = -ENOENT;
  153. break;
  154. }
  155. return err;
  156. }