Release 4.11 security/selinux/ss/mls.c

/*
 * Implementation of the multi-level security (MLS) policy.
 *
 * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
 */
/*
 * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
 *
 *      Support for enhanced MLS infrastructure.
 *
 * Copyright (C) 2004-2006 Trusted Computer Solutions, Inc.
 */
/*
 * Updated: Hewlett-Packard <paul@paul-moore.com>
 *
 *      Added support to import/export the MLS label from NetLabel
 *
 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <net/netlabel.h>
#include "sidtab.h"
#include "mls.h"
#include "policydb.h"
#include "services.h"

/*
 * Return the length in bytes for the MLS fields of the
 * security context string representation of `context'.
 */


int mls_compute_context_len(struct context *context)
{
	int i, l, len, head, prev;
	char *nm;
	struct ebitmap *e;
	struct ebitmap_node *node;

	if (!policydb.mls_enabled)
		return 0;

	len = 1; /* for the beginning ":" */
	for (l = 0; l < 2; l++) {
		int index_sens = context->range.level[l].sens;
		len += strlen(sym_name(&policydb, SYM_LEVELS, index_sens - 1));

		/* categories */
		head = -2;
		prev = -2;
		e = &context->range.level[l].cat;
		ebitmap_for_each_positive_bit(e, node, i) {
			if (i - prev > 1) {
				/* one or more negative bits are skipped */
				if (head != prev) {
					nm = sym_name(&policydb, SYM_CATS, prev);
					len += strlen(nm) + 1;
				}
				nm = sym_name(&policydb, SYM_CATS, i);
				len += strlen(nm) + 1;
				head = i;
			}
			prev = i;
		}
		if (prev != head) {
			nm = sym_name(&policydb, SYM_CATS, prev);
			len += strlen(nm) + 1;
		}
		if (l == 0) {
			if (mls_level_eq(&context->range.level[0],
					 &context->range.level[1]))
				break;
			else
				len++;
		}
	}

	return len;
}

Contributors
Person
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CommitProp
KaiGai Kohei
92
34.07%
1
16.67%
Andrew Morton
71
26.30%
1
16.67%
Darrel Goeddel
67
24.81%
1
16.67%
Eric Paris
28
10.37%
1
16.67%
Stephen D. Smalley
9
3.33%
1
16.67%
Guido Trentalancia
3
1.11%
1
16.67%
Total
270
100.00%
6
100.00%

/*
 * Write the security context string representation of
 * the MLS fields of `context' into the string `*scontext'.
 * Update `*scontext' to point to the end of the MLS fields.
 */


void mls_sid_to_context(struct context *context,
			char **scontext)
{
	char *scontextp, *nm;
	int i, l, head, prev;
	struct ebitmap *e;
	struct ebitmap_node *node;

	if (!policydb.mls_enabled)
		return;

	scontextp = *scontext;

	*scontextp = ':';
	scontextp++;

	for (l = 0; l < 2; l++) {
		strcpy(scontextp, sym_name(&policydb, SYM_LEVELS,
					   context->range.level[l].sens - 1));
		scontextp += strlen(scontextp);

		/* categories */
		head = -2;
		prev = -2;
		e = &context->range.level[l].cat;
		ebitmap_for_each_positive_bit(e, node, i) {
			if (i - prev > 1) {
				/* one or more negative bits are skipped */
				if (prev != head) {
					if (prev - head > 1)
						*scontextp++ = '.';
					else
						*scontextp++ = ',';
					nm = sym_name(&policydb, SYM_CATS, prev);
					strcpy(scontextp, nm);
					scontextp += strlen(nm);
				}
				if (prev < 0)
					*scontextp++ = ':';
				else
					*scontextp++ = ',';
				nm = sym_name(&policydb, SYM_CATS, i);
				strcpy(scontextp, nm);
				scontextp += strlen(nm);
				head = i;
			}
			prev = i;
		}

		if (prev != head) {
			if (prev - head > 1)
				*scontextp++ = '.';
			else
				*scontextp++ = ',';
			nm = sym_name(&policydb, SYM_CATS, prev);
			strcpy(scontextp, nm);
			scontextp += strlen(nm);
		}

		if (l == 0) {
			if (mls_level_eq(&context->range.level[0],
					 &context->range.level[1]))
				break;
			else
				*scontextp++ = '-';
		}
	}

	*scontext = scontextp;
	return;
}

Contributors
Person
Tokens
Prop
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CommitProp
Darrel Goeddel
118
32.24%
1
16.67%
Andrew Morton
117
31.97%
1
16.67%
KaiGai Kohei
91
24.86%
1
16.67%
Eric Paris
28
7.65%
1
16.67%
Stephen D. Smalley
9
2.46%
1
16.67%
Guido Trentalancia
3
0.82%
1
16.67%
Total
366
100.00%
6
100.00%



int mls_level_isvalid(struct policydb *p, struct mls_level *l)
{
	struct level_datum *levdatum;

	if (!l->sens || l->sens > p->p_levels.nprim)
		return 0;
	levdatum = hashtab_search(p->p_levels.table,
				  sym_name(p, SYM_LEVELS, l->sens - 1));
	if (!levdatum)
		return 0;

	/*
         * Return 1 iff all the bits set in l->cat are also be set in
         * levdatum->level->cat and no bit in l->cat is larger than
         * p->p_cats.nprim.
         */
	return ebitmap_contains(&levdatum->level->cat, &l->cat,
				p->p_cats.nprim);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
67
70.53%
1
20.00%
Waiman Long
12
12.63%
1
20.00%
Stephen D. Smalley
7
7.37%
1
20.00%
Eric Paris
6
6.32%
1
20.00%
Darrel Goeddel
3
3.16%
1
20.00%
Total
95
100.00%
5
100.00%



int mls_range_isvalid(struct policydb *p, struct mls_range *r)
{
	return (mls_level_isvalid(p, &r->level[0]) &&
		mls_level_isvalid(p, &r->level[1]) &&
		mls_level_dom(&r->level[1], &r->level[0]));
}

Contributors
Person
Tokens
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CommitProp
Stephen D. Smalley
63
100.00%
1
100.00%
Total
63
100.00%
1
100.00%

/*
 * Return 1 if the MLS fields in the security context
 * structure `c' are valid.  Return 0 otherwise.
 */


int mls_context_isvalid(struct policydb *p, struct context *c)
{
	struct user_datum *usrdatum;

	if (!p->mls_enabled)
		return 1;

	if (!mls_range_isvalid(p, &c->range))
		return 0;

	if (c->role == OBJECT_R_VAL)
		return 1;

	/*
         * User must be authorized for the MLS range.
         */
	if (!c->user || c->user > p->p_users.nprim)
		return 0;
	usrdatum = p->user_val_to_struct[c->user - 1];
	if (!mls_range_contains(usrdatum->range, c->range))
		return 0; /* user may not be associated with range */

	return 1;
}

Contributors
Person
Tokens
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CommitProp
Andrew Morton
64
57.14%
1
25.00%
Stephen D. Smalley
42
37.50%
1
25.00%
Darrel Goeddel
3
2.68%
1
25.00%
Guido Trentalancia
3
2.68%
1
25.00%
Total
112
100.00%
4
100.00%

/*
 * Set the MLS fields in the security context structure
 * `context' based on the string representation in
 * the string `*scontext'.  Update `*scontext' to
 * point to the end of the string representation of
 * the MLS fields.
 *
 * This function modifies the string in place, inserting
 * NULL characters to terminate the MLS fields.
 *
 * If a def_sid is provided and no MLS field is present,
 * copy the MLS field of the associated default context.
 * Used for upgraded to MLS systems where objects may lack
 * MLS fields.
 *
 * Policy read-lock must be held for sidtab lookup.
 *
 */


int mls_context_to_sid(struct policydb *pol,
		       char oldc,
		       char **scontext,
		       struct context *context,
		       struct sidtab *s,
		       u32 def_sid)
{

	char delim;
	char *scontextp, *p, *rngptr;
	struct level_datum *levdatum;
	struct cat_datum *catdatum, *rngdatum;
	int l, rc = -EINVAL;

	if (!pol->mls_enabled) {
		if (def_sid != SECSID_NULL && oldc)
			*scontext += strlen(*scontext) + 1;
		return 0;
	}

	/*
         * No MLS component to the security context, try and map to
         * default if provided.
         */
	if (!oldc) {
		struct context *defcon;

		if (def_sid == SECSID_NULL)
			goto out;

		defcon = sidtab_search(s, def_sid);
		if (!defcon)
			goto out;

		rc = mls_context_cpy(context, defcon);
		goto out;
	}

	/* Extract low sensitivity. */
	scontextp = p = *scontext;
	while (*p && *p != ':' && *p != '-')
		p++;

	delim = *p;
	if (delim != '\0')
		*p++ = '\0';

	for (l = 0; l < 2; l++) {
		levdatum = hashtab_search(pol->p_levels.table, scontextp);
		if (!levdatum) {
			rc = -EINVAL;
			goto out;
		}

		context->range.level[l].sens = levdatum->level->sens;

		if (delim == ':') {
			/* Extract category set. */
			while (1) {
				scontextp = p;
				while (*p && *p != ',' && *p != '-')
					p++;
				delim = *p;
				if (delim != '\0')
					*p++ = '\0';

				/* Separate into range if exists */
				rngptr = strchr(scontextp, '.');
				if (rngptr != NULL) {
					/* Remove '.' */
					*rngptr++ = '\0';
				}

				catdatum = hashtab_search(pol->p_cats.table,
							  scontextp);
				if (!catdatum) {
					rc = -EINVAL;
					goto out;
				}

				rc = ebitmap_set_bit(&context->range.level[l].cat,
						     catdatum->value - 1, 1);
				if (rc)
					goto out;

				/* If range, set all categories in range */
				if (rngptr) {
					int i;

					rngdatum = hashtab_search(pol->p_cats.table, rngptr);
					if (!rngdatum) {
						rc = -EINVAL;
						goto out;
					}

					if (catdatum->value >= rngdatum->value) {
						rc = -EINVAL;
						goto out;
					}

					for (i = catdatum->value; i < rngdatum->value; i++) {
						rc = ebitmap_set_bit(&context->range.level[l].cat, i, 1);
						if (rc)
							goto out;
					}
				}

				if (delim != ',')
					break;
			}
		}
		if (delim == '-') {
			/* Extract high sensitivity. */
			scontextp = p;
			while (*p && *p != ':')
				p++;

			delim = *p;
			if (delim != '\0')
				*p++ = '\0';
		} else
			break;
	}

	if (l == 0) {
		context->range.level[1].sens = context->range.level[0].sens;
		rc = ebitmap_cpy(&context->range.level[1].cat,
				 &context->range.level[0].cat);
		if (rc)
			goto out;
	}
	*scontext = ++p;
	rc = 0;
out:
	return rc;
}

Contributors
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Andrew Morton
382
60.93%
2
18.18%
Darrel Goeddel
148
23.60%
1
9.09%
James Morris
50
7.97%
1
9.09%
Stephen D. Smalley
30
4.78%
2
18.18%
Vesa-Matti J Kari
7
1.12%
1
9.09%
Eric Paris
4
0.64%
1
9.09%
Guido Trentalancia
3
0.48%
1
9.09%
Ron Yorston
2
0.32%
1
9.09%
Venkat Yekkirala
1
0.16%
1
9.09%
Total
627
100.00%
11
100.00%

/*
 * Set the MLS fields in the security context structure
 * `context' based on the string representation in
 * the string `str'.  This function will allocate temporary memory with the
 * given constraints of gfp_mask.
 */


int mls_from_string(char *str, struct context *context, gfp_t gfp_mask)
{
	char *tmpstr, *freestr;
	int rc;

	if (!policydb.mls_enabled)
		return -EINVAL;

	/* we need freestr because mls_context_to_sid will change
           the value of tmpstr */
	tmpstr = freestr = kstrdup(str, gfp_mask);
	if (!tmpstr) {
		rc = -ENOMEM;
	} else {
		rc = mls_context_to_sid(&policydb, ':', &tmpstr, context,
					NULL, SECSID_NULL);
		kfree(freestr);
	}

	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Darrel Goeddel
86
93.48%
1
33.33%
Stephen D. Smalley
3
3.26%
1
33.33%
Guido Trentalancia
3
3.26%
1
33.33%
Total
92
100.00%
3
100.00%

/*
 * Copies the MLS range `range' into `context'.
 */


int mls_range_set(struct context *context,
				struct mls_range *range)
{
	int l, rc = 0;

	/* Copy the MLS range into the  context */
	for (l = 0; l < 2; l++) {
		context->range.level[l].sens = range->level[l].sens;
		rc = ebitmap_cpy(&context->range.level[l].cat,
				 &range->level[l].cat);
		if (rc)
			break;
	}

	return rc;
}

Contributors
Person
Tokens
Prop
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CommitProp
Darrel Goeddel
57
61.29%
1
50.00%
Andrew Morton
36
38.71%
1
50.00%
Total
93
100.00%
2
100.00%



int mls_setup_user_range(struct context *fromcon, struct user_datum *user,
			 struct context *usercon)
{
	if (policydb.mls_enabled) {
		struct mls_level *fromcon_sen = &(fromcon->range.level[0]);
		struct mls_level *fromcon_clr = &(fromcon->range.level[1]);
		struct mls_level *user_low = &(user->range.level[0]);
		struct mls_level *user_clr = &(user->range.level[1]);
		struct mls_level *user_def = &(user->dfltlevel);
		struct mls_level *usercon_sen = &(usercon->range.level[0]);
		struct mls_level *usercon_clr = &(usercon->range.level[1]);

		/* Honor the user's default level if we can */
		if (mls_level_between(user_def, fromcon_sen, fromcon_clr))
			*usercon_sen = *user_def;
		else if (mls_level_between(fromcon_sen, user_def, user_clr))
			*usercon_sen = *fromcon_sen;
		else if (mls_level_between(fromcon_clr, user_low, user_def))
			*usercon_sen = *user_low;
		else
			return -EINVAL;

		/* Lower the clearance of available contexts
                   if the clearance of "fromcon" is lower than
                   that of the user's default clearance (but
                   only if the "fromcon" clearance dominates
                   the user's computed sensitivity level) */
		if (mls_level_dom(user_clr, fromcon_clr))
			*usercon_clr = *fromcon_clr;
		else if (mls_level_dom(fromcon_clr, user_clr))
			*usercon_clr = *user_clr;
		else
			return -EINVAL;
	}

	return 0;
}

Contributors
Person
Tokens
Prop
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CommitProp
Darrel Goeddel
172
71.37%
1
25.00%
Andrew Morton
62
25.73%
1
25.00%
Stephen D. Smalley
4
1.66%
1
25.00%
Guido Trentalancia
3
1.24%
1
25.00%
Total
241
100.00%
4
100.00%

/*
 * Convert the MLS fields in the security context
 * structure `c' from the values specified in the
 * policy `oldp' to the values specified in the policy `newp'.
 */


int mls_convert_context(struct policydb *oldp,
			struct policydb *newp,
			struct context *c)
{
	struct level_datum *levdatum;
	struct cat_datum *catdatum;
	struct ebitmap bitmap;
	struct ebitmap_node *node;
	int l, i;

	if (!policydb.mls_enabled)
		return 0;

	for (l = 0; l < 2; l++) {
		levdatum = hashtab_search(newp->p_levels.table,
					  sym_name(oldp, SYM_LEVELS,
						   c->range.level[l].sens - 1));

		if (!levdatum)
			return -EINVAL;
		c->range.level[l].sens = levdatum->level->sens;

		ebitmap_init(&bitmap);
		ebitmap_for_each_positive_bit(&c->range.level[l].cat, node, i) {
			int rc;

			catdatum = hashtab_search(newp->p_cats.table,
						  sym_name(oldp, SYM_CATS, i));
			if (!catdatum)
				return -EINVAL;
			rc = ebitmap_set_bit(&bitmap, catdatum->value - 1, 1);
			if (rc)
				return rc;

			cond_resched();
		}
		ebitmap_destroy(&c->range.level[l].cat);
		c->range.level[l].cat = bitmap;
	}

	return 0;
}

Contributors
Person
Tokens
Prop
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CommitProp
Darrel Goeddel
132
57.14%
1
12.50%
Andrew Morton
65
28.14%
1
12.50%
Stephen D. Smalley
15
6.49%
2
25.00%
Eric Paris
12
5.19%
1
12.50%
Guido Trentalancia
3
1.30%
1
12.50%
Dave Jones
3
1.30%
1
12.50%
KaiGai Kohei
1
0.43%
1
12.50%
Total
231
100.00%
8
100.00%



int mls_compute_sid(struct context *scontext,
		    struct context *tcontext,
		    u16 tclass,
		    u32 specified,
		    struct context *newcontext,
		    bool sock)
{
	struct range_trans rtr;
	struct mls_range *r;
	struct class_datum *cladatum;
	int default_range = 0;

	if (!policydb.mls_enabled)
		return 0;

	switch (specified) {
	case AVTAB_TRANSITION:
		/* Look for a range transition rule. */
		rtr.source_type = scontext->type;
		rtr.target_type = tcontext->type;
		rtr.target_class = tclass;
		r = hashtab_search(policydb.range_tr, &rtr);
		if (r)
			return mls_range_set(newcontext, r);

		if (tclass && tclass <= policydb.p_classes.nprim) {
			cladatum = policydb.class_val_to_struct[tclass - 1];
			if (cladatum)
				default_range = cladatum->default_range;
		}

		switch (default_range) {
		case DEFAULT_SOURCE_LOW:
			return mls_context_cpy_low(newcontext, scontext);
		case DEFAULT_SOURCE_HIGH:
			return mls_context_cpy_high(newcontext, scontext);
		case DEFAULT_SOURCE_LOW_HIGH:
			return mls_context_cpy(newcontext, scontext);
		case DEFAULT_TARGET_LOW:
			return mls_context_cpy_low(newcontext, tcontext);
		case DEFAULT_TARGET_HIGH:
			return mls_context_cpy_high(newcontext, tcontext);
		case DEFAULT_TARGET_LOW_HIGH:
			return mls_context_cpy(newcontext, tcontext);
		}

		/* Fallthrough */
	case AVTAB_CHANGE:
		if ((tclass == policydb.process_class) || (sock == true))
			/* Use the process MLS attributes. */
			return mls_context_cpy(newcontext, scontext);
		else
			/* Use the process effective MLS attributes. */
			return mls_context_cpy_low(newcontext, scontext);
	case AVTAB_MEMBER:
		/* Use the process effective MLS attributes. */
		return mls_context_cpy_low(newcontext, scontext);

	/* fall through */
	}
	return -EINVAL;
}

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Tokens
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Eric Paris
117
42.24%
1
9.09%
Darrel Goeddel
79
28.52%
2
18.18%
Stephen D. Smalley
35
12.64%
3
27.27%
Andrew Morton
28
10.11%
1
9.09%
Harry Ciao
11
3.97%
1
9.09%
Venkat Yekkirala
3
1.08%
1
9.09%
Guido Trentalancia
3
1.08%
1
9.09%
Américo Wang
1
0.36%
1
9.09%
Total
277
100.00%
11
100.00%

#ifdef CONFIG_NETLABEL
/**
 * mls_export_netlbl_lvl - Export the MLS sensitivity levels to NetLabel
 * @context: the security context
 * @secattr: the NetLabel security attributes
 *
 * Description:
 * Given the security context copy the low MLS sensitivity level into the
 * NetLabel MLS sensitivity level field.
 *
 */


void mls_export_netlbl_lvl(struct context *context,
			   struct netlbl_lsm_secattr *secattr)
{
	if (!policydb.mls_enabled)
		return;

	secattr->attr.mls.lvl = context->range.level[0].sens - 1;
	secattr->flags |= NETLBL_SECATTR_MLS_LVL;
}

Contributors
Person
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CommitProp
Venkat Yekkirala
32
64.00%
1
25.00%
Paul Moore
15
30.00%
2
50.00%
Guido Trentalancia
3
6.00%
1
25.00%
Total
50
100.00%
4
100.00%

/**
 * mls_import_netlbl_lvl - Import the NetLabel MLS sensitivity levels
 * @context: the security context
 * @secattr: the NetLabel security attributes
 *
 * Description:
 * Given the security context and the NetLabel security attributes, copy the
 * NetLabel MLS sensitivity level into the context.
 *
 */


void mls_import_netlbl_lvl(struct context *context,
			   struct netlbl_lsm_secattr *secattr)
{
	if (!policydb.mls_enabled)
		return;

	context->range.level[0].sens = secattr->attr.mls.lvl + 1;
	context->range.level[1].sens = context->range.level[0].sens;
}

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Venkat Yekkirala
41
62.12%
1
25.00%
Paul Moore
22
33.33%
2
50.00%
Guido Trentalancia
3
4.55%
1
25.00%
Total
66
100.00%
4
100.00%

/**
 * mls_export_netlbl_cat - Export the MLS categories to NetLabel
 * @context: the security context
 * @secattr: the NetLabel security attributes
 *
 * Description:
 * Given the security context copy the low MLS categories into the NetLabel
 * MLS category field.  Returns zero on success, negative values on failure.
 *
 */


int mls_export_netlbl_cat(struct context *context,
			  struct netlbl_lsm_secattr *secattr)
{
	int rc;

	if (!policydb.mls_enabled)
		return 0;

	rc = ebitmap_netlbl_export(&context->range.level[0].cat,
				   &secattr->attr.mls.cat);
	if (rc == 0 && secattr->attr.mls.cat != NULL)
		secattr->flags |= NETLBL_SECATTR_MLS_CAT;

	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Venkat Yekkirala
49
62.03%
1
20.00%
Paul Moore
27
34.18%
3
60.00%
Guido Trentalancia
3
3.80%
1
20.00%
Total
79
100.00%
5
100.00%

/**
 * mls_import_netlbl_cat - Import the MLS categories from NetLabel
 * @context: the security context
 * @secattr: the NetLabel security attributes
 *
 * Description:
 * Copy the NetLabel security attributes into the SELinux context; since the
 * NetLabel security attribute only contains a single MLS category use it for
 * both the low and high categories of the context.  Returns zero on success,
 * negative values on failure.
 *
 */


int mls_import_netlbl_cat(struct context *context,
			  struct netlbl_lsm_secattr *secattr)
{
	int rc;

	if (!policydb.mls_enabled)
		return 0;

	rc = ebitmap_netlbl_import(&context->range.level[0].cat,
				   secattr->attr.mls.cat);
	if (rc)
		goto import_netlbl_cat_failure;
	memcpy(&context->range.level[1].cat, &context->range.level[0].cat,
	       sizeof(context->range.level[0].cat));

	return 0;

import_netlbl_cat_failure:
	ebitmap_destroy(&context->range.level[0].cat);
	return rc;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Venkat Yekkirala
97
78.23%
1
20.00%
Paul Moore
24
19.35%
3
60.00%
Guido Trentalancia
3
2.42%
1
20.00%
Total
124
100.00%
5
100.00%

#endif /* CONFIG_NETLABEL */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
914
32.26%
3
9.38%
Darrel Goeddel
871
30.74%
3
9.38%
Venkat Yekkirala
223
7.87%
2
6.25%
Stephen D. Smalley
218
7.70%
7
21.88%
Eric Paris
195
6.88%
3
9.38%
KaiGai Kohei
184
6.49%
1
3.12%
Paul Moore
102
3.60%
5
15.62%
James Morris
54
1.91%
1
3.12%
Guido Trentalancia
36
1.27%
1
3.12%
Waiman Long
12
0.42%
1
3.12%
Harry Ciao
11
0.39%
1
3.12%
Vesa-Matti J Kari
7
0.25%
1
3.12%
Dave Jones
3
0.11%
1
3.12%
Ron Yorston
2
0.07%
1
3.12%
Américo Wang
1
0.04%
1
3.12%
Total
2833
100.00%
32
100.00%
Directory: security/selinux/ss

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