Release 4.10 security/selinux/nlmsgtab.c

/*
 * 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>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2,
 * as published by the Free Software Foundation.
 */
#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 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_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  },
};


static 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 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  },
};


static 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, struct nlmsg_perm *tab, size_t tabsize)
{
	int i, 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;
}

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james morris
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int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm)
{
	int err = 0;

	switch (sclass) {
	case SECCLASS_NETLINK_ROUTE_SOCKET:
		/* RTM_MAX always point to RTM_SETxxxx, ie RTM_NEWxxx + 3 */
		BUILD_BUG_ON(RTM_MAX != (RTM_NEWSTATS + 3));
		err = nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms,
				 sizeof(nlmsg_route_perms));
		break;

	case SECCLASS_NETLINK_TCPDIAG_SOCKET:
		err = nlmsg_perm(nlmsg_type, perm, nlmsg_tcpdiag_perms,
				 sizeof(nlmsg_tcpdiag_perms));
		break;

	case SECCLASS_NETLINK_XFRM_SOCKET:
		BUILD_BUG_ON(XFRM_MSG_MAX != XFRM_MSG_MAPPING);
		err = nlmsg_perm(nlmsg_type, perm, nlmsg_xfrm_perms,
				 sizeof(nlmsg_xfrm_perms));
		break;

	case SECCLASS_NETLINK_AUDIT_SOCKET:
		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;
		} else {
			err = nlmsg_perm(nlmsg_type, perm, nlmsg_audit_perms,
					 sizeof(nlmsg_audit_perms));
		}
		break;

	/* No messaging from userspace, or class unknown/unhandled */
	default:
		err = -ENOENT;
		break;
	}

	return err;
}
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james morris
james morris
117
69.64%
1
20.00%
david woodhouse
david woodhouse
20
11.90%
1
20.00%
nicolas dichtel
nicolas dichtel
18
10.71%
1
20.00%
steve grubb
steve grubb
12
7.14%
1
20.00%
roopa prabhu
roopa prabhu
1
0.60%
1
20.00%
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168
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5
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Overall Contributors
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james morris
james morris
561
64.26%
5
15.62%
nicolas dichtel
nicolas dichtel
78
8.93%
9
28.12%
jamal hadi salim
jamal hadi salim
42
4.81%
1
3.12%
eric paris
eric paris
37
4.24%
4
12.50%
americo wang
americo wang
30
3.44%
3
9.38%
david woodhouse
david woodhouse
20
2.29%
1
3.12%
amy griffis
amy griffis
18
2.06%
1
3.12%
steve grubb
steve grubb
18
2.06%
2
6.25%
michal schmidt
michal schmidt
18
2.06%
1
3.12%
roopa prabhu
roopa prabhu
13
1.49%
1
3.12%
thomas graf
thomas graf
12
1.37%
1
3.12%
miloslav trmac
miloslav trmac
11
1.26%
1
3.12%
paul moore
paul moore
9
1.03%
1
3.12%
lorenzo colitti
lorenzo colitti
6
0.69%
1
3.12%
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Directory: security/selinux

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