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security/selinux/ss/mls.c
15.7 KB
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/* * 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. * |
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* Copyright (C) 2004-2006 Trusted Computer Solutions, Inc. |
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*/ |
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/* |
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* Updated: Hewlett-Packard <paul@paul-moore.com> |
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* |
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* Added support to import/export the MLS label from NetLabel |
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* * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 */ |
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#include <linux/kernel.h> #include <linux/slab.h> #include <linux/string.h> #include <linux/errno.h> |
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#include <net/netlabel.h> |
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#include "sidtab.h" |
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#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'. */ |
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int mls_compute_context_len(struct context *context) |
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{ |
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int i, l, len, head, prev; char *nm; struct ebitmap *e; |
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struct ebitmap_node *node; |
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|
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if (!policydb.mls_enabled) |
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return 0; len = 1; /* for the beginning ":" */ for (l = 0; l < 2; l++) { |
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int index_sens = context->range.level[l].sens; |
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len += strlen(sym_name(&policydb, SYM_LEVELS, index_sens - 1)); |
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|
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/* 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) { |
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nm = sym_name(&policydb, SYM_CATS, prev); |
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len += strlen(nm) + 1; } |
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nm = sym_name(&policydb, SYM_CATS, i); |
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len += strlen(nm) + 1; head = i; |
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} |
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prev = i; } if (prev != head) { |
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nm = sym_name(&policydb, SYM_CATS, prev); |
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len += strlen(nm) + 1; |
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} |
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if (l == 0) { if (mls_level_eq(&context->range.level[0], |
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&context->range.level[1])) |
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break; else len++; } } return len; } /* * 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, |
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char **scontext) |
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{ |
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char *scontextp, *nm; int i, l, head, prev; struct ebitmap *e; |
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struct ebitmap_node *node; |
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|
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if (!policydb.mls_enabled) |
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return; scontextp = *scontext; *scontextp = ':'; scontextp++; for (l = 0; l < 2; l++) { |
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strcpy(scontextp, sym_name(&policydb, SYM_LEVELS, context->range.level[l].sens - 1)); |
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scontextp += strlen(scontextp); |
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/* categories */ |
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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) |
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*scontextp++ = '.'; else *scontextp++ = ','; |
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nm = sym_name(&policydb, SYM_CATS, prev); |
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strcpy(scontextp, nm); scontextp += strlen(nm); |
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} |
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if (prev < 0) *scontextp++ = ':'; else *scontextp++ = ','; |
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nm = sym_name(&policydb, SYM_CATS, i); |
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strcpy(scontextp, nm); scontextp += strlen(nm); head = i; |
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} |
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prev = i; |
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} |
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if (prev != head) { if (prev - head > 1) |
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*scontextp++ = '.'; else *scontextp++ = ','; |
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nm = sym_name(&policydb, SYM_CATS, prev); |
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strcpy(scontextp, nm); scontextp += strlen(nm); |
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} if (l == 0) { if (mls_level_eq(&context->range.level[0], |
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&context->range.level[1])) |
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break; |
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else *scontextp++ = '-'; |
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} } *scontext = scontextp; return; } |
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int mls_level_isvalid(struct policydb *p, struct mls_level *l) { struct level_datum *levdatum; |
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if (!l->sens || l->sens > p->p_levels.nprim) return 0; levdatum = hashtab_search(p->p_levels.table, |
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sym_name(p, SYM_LEVELS, l->sens - 1)); |
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if (!levdatum) return 0; |
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/* * 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); |
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} 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])); } |
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/* * 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) { |
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struct user_datum *usrdatum; |
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|
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if (!p->mls_enabled) |
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return 1; |
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if (!mls_range_isvalid(p, &c->range)) |
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return 0; |
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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; } /* * 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. |
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* * 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. * |
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*/ |
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int mls_context_to_sid(struct policydb *pol, char oldc, |
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char **scontext, |
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struct context *context, struct sidtab *s, u32 def_sid) |
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{ char delim; char *scontextp, *p, *rngptr; struct level_datum *levdatum; struct cat_datum *catdatum, *rngdatum; int l, rc = -EINVAL; |
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if (!pol->mls_enabled) { |
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if (def_sid != SECSID_NULL && oldc) |
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*scontext += strlen(*scontext) + 1; |
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return 0; |
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} |
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|
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/* * 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; |
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rc = mls_context_cpy(context, defcon); |
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goto out; |
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} |
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/* Extract low sensitivity. */ scontextp = p = *scontext; while (*p && *p != ':' && *p != '-') p++; delim = *p; |
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if (delim != '\0') *p++ = '\0'; |
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for (l = 0; l < 2; l++) { |
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levdatum = hashtab_search(pol->p_levels.table, scontextp); |
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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; |
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if (delim != '\0') *p++ = '\0'; |
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/* Separate into range if exists */ |
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rngptr = strchr(scontextp, '.'); if (rngptr != NULL) { |
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/* Remove '.' */ |
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*rngptr++ = '\0'; |
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} |
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catdatum = hashtab_search(pol->p_cats.table, |
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scontextp); |
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if (!catdatum) { rc = -EINVAL; goto out; } rc = ebitmap_set_bit(&context->range.level[l].cat, |
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catdatum->value - 1, 1); |
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if (rc) goto out; /* If range, set all categories in range */ if (rngptr) { int i; |
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rngdatum = hashtab_search(pol->p_cats.table, rngptr); |
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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; |
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if (delim != '\0') *p++ = '\0'; |
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} 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; } /* |
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* 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; |
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if (!policydb.mls_enabled) |
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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 { |
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rc = mls_context_to_sid(&policydb, ':', &tmpstr, context, |
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NULL, SECSID_NULL); |
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kfree(freestr); } return rc; } /* |
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* Copies the MLS range `range' into `context'. */ |
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int mls_range_set(struct context *context, |
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struct mls_range *range) |
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{ 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; } int mls_setup_user_range(struct context *fromcon, struct user_datum *user, |
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struct context *usercon) |
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{ |
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if (policydb.mls_enabled) { |
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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 */ |
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if (mls_level_between(user_def, fromcon_sen, fromcon_clr)) |
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*usercon_sen = *user_def; |
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else if (mls_level_between(fromcon_sen, user_def, user_clr)) |
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*usercon_sen = *fromcon_sen; |
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else if (mls_level_between(fromcon_clr, user_low, user_def)) |
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*usercon_sen = *user_low; |
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else |
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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) */ |
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if (mls_level_dom(user_clr, fromcon_clr)) |
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*usercon_clr = *fromcon_clr; |
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else if (mls_level_dom(fromcon_clr, user_clr)) |
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*usercon_clr = *user_clr; |
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else |
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return -EINVAL; } return 0; } /* * 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; |
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struct ebitmap_node *node; |
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int l, i; |
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if (!policydb.mls_enabled) |
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return 0; for (l = 0; l < 2; l++) { levdatum = hashtab_search(newp->p_levels.table, |
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sym_name(oldp, SYM_LEVELS, c->range.level[l].sens - 1)); |
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if (!levdatum) return -EINVAL; c->range.level[l].sens = levdatum->level->sens; ebitmap_init(&bitmap); |
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ebitmap_for_each_positive_bit(&c->range.level[l].cat, node, i) { int rc; catdatum = hashtab_search(newp->p_cats.table, |
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sym_name(oldp, SYM_CATS, i)); |
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if (!catdatum) return -EINVAL; rc = ebitmap_set_bit(&bitmap, catdatum->value - 1, 1); if (rc) return rc; |
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cond_resched(); |
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} ebitmap_destroy(&c->range.level[l].cat); c->range.level[l].cat = bitmap; } return 0; } int mls_compute_sid(struct context *scontext, struct context *tcontext, u16 tclass, u32 specified, |
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struct context *newcontext, bool sock) |
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{ |
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struct range_trans rtr; struct mls_range *r; |
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struct class_datum *cladatum; int default_range = 0; |
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|
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if (!policydb.mls_enabled) |
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return 0; switch (specified) { case AVTAB_TRANSITION: |
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/* Look for a range transition rule. */ |
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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); |
aa893269d SELinux: allow de... |
517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 |
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); } |
1da177e4c Linux-2.6.12-rc2 |
538 539 |
/* Fallthrough */ case AVTAB_CHANGE: |
6f5317e73 SELinux: Socket r... |
540 |
if ((tclass == policydb.process_class) || (sock == true)) |
1da177e4c Linux-2.6.12-rc2 |
541 |
/* Use the process MLS attributes. */ |
0efc61eae selinux: Delete m... |
542 |
return mls_context_cpy(newcontext, scontext); |
1da177e4c Linux-2.6.12-rc2 |
543 544 |
else /* Use the process effective MLS attributes. */ |
0efc61eae selinux: Delete m... |
545 |
return mls_context_cpy_low(newcontext, scontext); |
1da177e4c Linux-2.6.12-rc2 |
546 |
case AVTAB_MEMBER: |
2e08c0c1c selinux: make mls... |
547 548 |
/* Use the process effective MLS attributes. */ return mls_context_cpy_low(newcontext, scontext); |
08e3daff2 selinux: remove a... |
549 550 |
/* fall through */ |
1da177e4c Linux-2.6.12-rc2 |
551 552 553 |
} return -EINVAL; } |
027527603 NetLabel: convert... |
554 |
#ifdef CONFIG_NETLABEL |
7420ed23a [NetLabel]: SELin... |
555 |
/** |
027527603 NetLabel: convert... |
556 |
* mls_export_netlbl_lvl - Export the MLS sensitivity levels to NetLabel |
7420ed23a [NetLabel]: SELin... |
557 |
* @context: the security context |
027527603 NetLabel: convert... |
558 |
* @secattr: the NetLabel security attributes |
7420ed23a [NetLabel]: SELin... |
559 560 |
* * Description: |
027527603 NetLabel: convert... |
561 562 |
* Given the security context copy the low MLS sensitivity level into the * NetLabel MLS sensitivity level field. |
7420ed23a [NetLabel]: SELin... |
563 564 |
* */ |
027527603 NetLabel: convert... |
565 566 |
void mls_export_netlbl_lvl(struct context *context, struct netlbl_lsm_secattr *secattr) |
7420ed23a [NetLabel]: SELin... |
567 |
{ |
0719aaf5e selinux: allow ML... |
568 |
if (!policydb.mls_enabled) |
7420ed23a [NetLabel]: SELin... |
569 |
return; |
16efd4543 NetLabel: Add sec... |
570 |
secattr->attr.mls.lvl = context->range.level[0].sens - 1; |
027527603 NetLabel: convert... |
571 |
secattr->flags |= NETLBL_SECATTR_MLS_LVL; |
7420ed23a [NetLabel]: SELin... |
572 573 574 |
} /** |
027527603 NetLabel: convert... |
575 |
* mls_import_netlbl_lvl - Import the NetLabel MLS sensitivity levels |
7420ed23a [NetLabel]: SELin... |
576 |
* @context: the security context |
027527603 NetLabel: convert... |
577 |
* @secattr: the NetLabel security attributes |
7420ed23a [NetLabel]: SELin... |
578 579 |
* * Description: |
027527603 NetLabel: convert... |
580 581 |
* Given the security context and the NetLabel security attributes, copy the * NetLabel MLS sensitivity level into the context. |
7420ed23a [NetLabel]: SELin... |
582 583 |
* */ |
027527603 NetLabel: convert... |
584 585 |
void mls_import_netlbl_lvl(struct context *context, struct netlbl_lsm_secattr *secattr) |
7420ed23a [NetLabel]: SELin... |
586 |
{ |
0719aaf5e selinux: allow ML... |
587 |
if (!policydb.mls_enabled) |
7420ed23a [NetLabel]: SELin... |
588 |
return; |
16efd4543 NetLabel: Add sec... |
589 |
context->range.level[0].sens = secattr->attr.mls.lvl + 1; |
027527603 NetLabel: convert... |
590 |
context->range.level[1].sens = context->range.level[0].sens; |
7420ed23a [NetLabel]: SELin... |
591 592 593 |
} /** |
027527603 NetLabel: convert... |
594 |
* mls_export_netlbl_cat - Export the MLS categories to NetLabel |
7420ed23a [NetLabel]: SELin... |
595 |
* @context: the security context |
027527603 NetLabel: convert... |
596 |
* @secattr: the NetLabel security attributes |
7420ed23a [NetLabel]: SELin... |
597 598 |
* * Description: |
027527603 NetLabel: convert... |
599 600 |
* Given the security context copy the low MLS categories into the NetLabel * MLS category field. Returns zero on success, negative values on failure. |
7420ed23a [NetLabel]: SELin... |
601 602 |
* */ |
027527603 NetLabel: convert... |
603 604 |
int mls_export_netlbl_cat(struct context *context, struct netlbl_lsm_secattr *secattr) |
7420ed23a [NetLabel]: SELin... |
605 |
{ |
027527603 NetLabel: convert... |
606 |
int rc; |
7420ed23a [NetLabel]: SELin... |
607 |
|
0719aaf5e selinux: allow ML... |
608 |
if (!policydb.mls_enabled) |
7420ed23a [NetLabel]: SELin... |
609 |
return 0; |
027527603 NetLabel: convert... |
610 |
rc = ebitmap_netlbl_export(&context->range.level[0].cat, |
16efd4543 NetLabel: Add sec... |
611 612 |
&secattr->attr.mls.cat); if (rc == 0 && secattr->attr.mls.cat != NULL) |
027527603 NetLabel: convert... |
613 |
secattr->flags |= NETLBL_SECATTR_MLS_CAT; |
7420ed23a [NetLabel]: SELin... |
614 |
|
7420ed23a [NetLabel]: SELin... |
615 616 617 618 |
return rc; } /** |
027527603 NetLabel: convert... |
619 |
* mls_import_netlbl_cat - Import the MLS categories from NetLabel |
7420ed23a [NetLabel]: SELin... |
620 |
* @context: the security context |
027527603 NetLabel: convert... |
621 |
* @secattr: the NetLabel security attributes |
7420ed23a [NetLabel]: SELin... |
622 623 |
* * Description: |
027527603 NetLabel: convert... |
624 625 626 627 |
* 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. |
7420ed23a [NetLabel]: SELin... |
628 629 |
* */ |
027527603 NetLabel: convert... |
630 631 |
int mls_import_netlbl_cat(struct context *context, struct netlbl_lsm_secattr *secattr) |
7420ed23a [NetLabel]: SELin... |
632 |
{ |
027527603 NetLabel: convert... |
633 |
int rc; |
7420ed23a [NetLabel]: SELin... |
634 |
|
0719aaf5e selinux: allow ML... |
635 |
if (!policydb.mls_enabled) |
7420ed23a [NetLabel]: SELin... |
636 |
return 0; |
027527603 NetLabel: convert... |
637 |
rc = ebitmap_netlbl_import(&context->range.level[0].cat, |
16efd4543 NetLabel: Add sec... |
638 |
secattr->attr.mls.cat); |
da8026fa0 selinux: reconcil... |
639 |
if (rc) |
027527603 NetLabel: convert... |
640 |
goto import_netlbl_cat_failure; |
da8026fa0 selinux: reconcil... |
641 642 |
memcpy(&context->range.level[1].cat, &context->range.level[0].cat, sizeof(context->range.level[0].cat)); |
7420ed23a [NetLabel]: SELin... |
643 644 |
return 0; |
027527603 NetLabel: convert... |
645 |
import_netlbl_cat_failure: |
7420ed23a [NetLabel]: SELin... |
646 |
ebitmap_destroy(&context->range.level[0].cat); |
7420ed23a [NetLabel]: SELin... |
647 648 |
return rc; } |
027527603 NetLabel: convert... |
649 |
#endif /* CONFIG_NETLABEL */ |