| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Netlink message type permission tables, for user generated messages. |
| * |
| * Author: James Morris <jmorris@redhat.com> |
| * |
| * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com> |
| */ |
| #include <linux/types.h> |
| #include <linux/kernel.h> |
| #include <linux/netlink.h> |
| #include <linux/rtnetlink.h> |
| #include <linux/if.h> |
| #include <linux/inet_diag.h> |
| #include <linux/xfrm.h> |
| #include <linux/audit.h> |
| #include <linux/sock_diag.h> |
| |
| #include "flask.h" |
| #include "av_permissions.h" |
| #include "security.h" |
| |
| struct nlmsg_perm { |
| u16 nlmsg_type; |
| u32 perm; |
| }; |
| |
| static const struct nlmsg_perm nlmsg_route_perms[] = { |
| { RTM_NEWLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_DELLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_GETLINK, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
| { RTM_SETLINK, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_NEWADDR, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_DELADDR, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_GETADDR, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
| { RTM_NEWROUTE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_DELROUTE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_GETROUTE, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
| { RTM_NEWNEIGH, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_DELNEIGH, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_GETNEIGH, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
| { RTM_NEWRULE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_DELRULE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_GETRULE, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
| { RTM_NEWQDISC, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_DELQDISC, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_GETQDISC, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
| { RTM_NEWTCLASS, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_DELTCLASS, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_GETTCLASS, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
| { RTM_NEWTFILTER, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_DELTFILTER, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_GETTFILTER, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
| { RTM_NEWACTION, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_DELACTION, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_GETACTION, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
| { RTM_NEWPREFIX, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_GETMULTICAST, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
| { RTM_GETANYCAST, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
| { RTM_GETNEIGHTBL, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
| { RTM_SETNEIGHTBL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_NEWADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_DELADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_GETADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
| { RTM_GETDCB, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
| { RTM_SETDCB, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_NEWNETCONF, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_DELNETCONF, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_GETNETCONF, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
| { RTM_NEWMDB, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_DELMDB, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_GETMDB, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
| { RTM_NEWNSID, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_DELNSID, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
| { RTM_GETNSID, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
| { RTM_NEWSTATS, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
| { RTM_GETSTATS, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
| { RTM_SETSTATS, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_NEWCACHEREPORT, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
| { RTM_NEWCHAIN, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_DELCHAIN, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_GETCHAIN, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
| { RTM_NEWNEXTHOP, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_DELNEXTHOP, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_GETNEXTHOP, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
| { RTM_NEWLINKPROP, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_DELLINKPROP, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_NEWVLAN, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_DELVLAN, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_GETVLAN, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
| { RTM_NEWNEXTHOPBUCKET, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_DELNEXTHOPBUCKET, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_GETNEXTHOPBUCKET, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
| { RTM_NEWTUNNEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_DELTUNNEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, |
| { RTM_GETTUNNEL, NETLINK_ROUTE_SOCKET__NLMSG_READ }, |
| }; |
| |
| static const struct nlmsg_perm nlmsg_tcpdiag_perms[] = { |
| { TCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ }, |
| { DCCPDIAG_GETSOCK, NETLINK_TCPDIAG_SOCKET__NLMSG_READ }, |
| { SOCK_DIAG_BY_FAMILY, NETLINK_TCPDIAG_SOCKET__NLMSG_READ }, |
| { SOCK_DESTROY, NETLINK_TCPDIAG_SOCKET__NLMSG_WRITE }, |
| }; |
| |
| static const struct nlmsg_perm nlmsg_xfrm_perms[] = { |
| { XFRM_MSG_NEWSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
| { XFRM_MSG_DELSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
| { XFRM_MSG_GETSA, NETLINK_XFRM_SOCKET__NLMSG_READ }, |
| { XFRM_MSG_NEWPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
| { XFRM_MSG_DELPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
| { XFRM_MSG_GETPOLICY, NETLINK_XFRM_SOCKET__NLMSG_READ }, |
| { XFRM_MSG_ALLOCSPI, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
| { XFRM_MSG_ACQUIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
| { XFRM_MSG_EXPIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
| { XFRM_MSG_UPDPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
| { XFRM_MSG_UPDSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
| { XFRM_MSG_POLEXPIRE, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
| { XFRM_MSG_FLUSHSA, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
| { XFRM_MSG_FLUSHPOLICY, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
| { XFRM_MSG_NEWAE, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
| { XFRM_MSG_GETAE, NETLINK_XFRM_SOCKET__NLMSG_READ }, |
| { XFRM_MSG_REPORT, NETLINK_XFRM_SOCKET__NLMSG_READ }, |
| { XFRM_MSG_MIGRATE, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
| { XFRM_MSG_NEWSADINFO, NETLINK_XFRM_SOCKET__NLMSG_READ }, |
| { XFRM_MSG_GETSADINFO, NETLINK_XFRM_SOCKET__NLMSG_READ }, |
| { XFRM_MSG_NEWSPDINFO, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
| { XFRM_MSG_GETSPDINFO, NETLINK_XFRM_SOCKET__NLMSG_READ }, |
| { XFRM_MSG_MAPPING, NETLINK_XFRM_SOCKET__NLMSG_READ }, |
| { XFRM_MSG_SETDEFAULT, NETLINK_XFRM_SOCKET__NLMSG_WRITE }, |
| { XFRM_MSG_GETDEFAULT, NETLINK_XFRM_SOCKET__NLMSG_READ }, |
| }; |
| |
| static const struct nlmsg_perm nlmsg_audit_perms[] = { |
| { AUDIT_GET, NETLINK_AUDIT_SOCKET__NLMSG_READ }, |
| { AUDIT_SET, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, |
| { AUDIT_LIST, NETLINK_AUDIT_SOCKET__NLMSG_READPRIV }, |
| { AUDIT_ADD, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, |
| { AUDIT_DEL, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, |
| { AUDIT_LIST_RULES, NETLINK_AUDIT_SOCKET__NLMSG_READPRIV }, |
| { AUDIT_ADD_RULE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, |
| { AUDIT_DEL_RULE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, |
| { AUDIT_USER, NETLINK_AUDIT_SOCKET__NLMSG_RELAY }, |
| { AUDIT_SIGNAL_INFO, NETLINK_AUDIT_SOCKET__NLMSG_READ }, |
| { AUDIT_TRIM, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, |
| { AUDIT_MAKE_EQUIV, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, |
| { AUDIT_TTY_GET, NETLINK_AUDIT_SOCKET__NLMSG_READ }, |
| { AUDIT_TTY_SET, NETLINK_AUDIT_SOCKET__NLMSG_TTY_AUDIT }, |
| { AUDIT_GET_FEATURE, NETLINK_AUDIT_SOCKET__NLMSG_READ }, |
| { AUDIT_SET_FEATURE, NETLINK_AUDIT_SOCKET__NLMSG_WRITE }, |
| }; |
| |
| static int nlmsg_perm(u16 nlmsg_type, u32 *perm, const struct nlmsg_perm *tab, |
| size_t tabsize) |
| { |
| unsigned int i; |
| int err = -EINVAL; |
| |
| for (i = 0; i < tabsize / sizeof(struct nlmsg_perm); i++) |
| if (nlmsg_type == tab[i].nlmsg_type) { |
| *perm = tab[i].perm; |
| err = 0; |
| break; |
| } |
| |
| return err; |
| } |
| |
| int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm) |
| { |
| /* While it is possible to add a similar permission to other netlink |
| * classes, note that the extended permission value is matched against |
| * the nlmsg_type field. Notably, SECCLASS_NETLINK_GENERIC_SOCKET uses |
| * dynamic values for this field, which means that it cannot be added |
| * as-is. |
| */ |
| |
| switch (sclass) { |
| case SECCLASS_NETLINK_ROUTE_SOCKET: |
| /* RTM_MAX always points to RTM_SETxxxx, ie RTM_NEWxxx + 3. |
| * If the BUILD_BUG_ON() below fails you must update the |
| * structures at the top of this file with the new mappings |
| * before updating the BUILD_BUG_ON() macro! |
| */ |
| BUILD_BUG_ON(RTM_MAX != (RTM_NEWTUNNEL + 3)); |
| |
| if (selinux_policycap_netlink_xperm()) { |
| *perm = NETLINK_ROUTE_SOCKET__NLMSG; |
| return 0; |
| } |
| return nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms, |
| sizeof(nlmsg_route_perms)); |
| break; |
| case SECCLASS_NETLINK_TCPDIAG_SOCKET: |
| if (selinux_policycap_netlink_xperm()) { |
| *perm = NETLINK_TCPDIAG_SOCKET__NLMSG; |
| return 0; |
| } |
| return nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms, |
| sizeof(nlmsg_tcpdiag_perms)); |
| break; |
| case SECCLASS_NETLINK_XFRM_SOCKET: |
| /* If the BUILD_BUG_ON() below fails you must update the |
| * structures at the top of this file with the new mappings |
| * before updating the BUILD_BUG_ON() macro! |
| */ |
| BUILD_BUG_ON(XFRM_MSG_MAX != XFRM_MSG_GETDEFAULT); |
| |
| if (selinux_policycap_netlink_xperm()) { |
| *perm = NETLINK_XFRM_SOCKET__NLMSG; |
| return 0; |
| } |
| return nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms, |
| sizeof(nlmsg_xfrm_perms)); |
| break; |
| case SECCLASS_NETLINK_AUDIT_SOCKET: |
| if (selinux_policycap_netlink_xperm()) { |
| *perm = NETLINK_AUDIT_SOCKET__NLMSG; |
| return 0; |
| } else if ((nlmsg_type >= AUDIT_FIRST_USER_MSG && |
| nlmsg_type <= AUDIT_LAST_USER_MSG) || |
| (nlmsg_type >= AUDIT_FIRST_USER_MSG2 && |
| nlmsg_type <= AUDIT_LAST_USER_MSG2)) { |
| *perm = NETLINK_AUDIT_SOCKET__NLMSG_RELAY; |
| return 0; |
| } |
| return nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms, |
| sizeof(nlmsg_audit_perms)); |
| break; |
| } |
| |
| /* No messaging from userspace, or class unknown/unhandled */ |
| return -ENOENT; |
| } |
