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Diffstat (limited to 'sys/contrib/lomac/kernel_mediate.c')
| -rw-r--r-- | sys/contrib/lomac/kernel_mediate.c | 280 |
1 files changed, 0 insertions, 280 deletions
diff --git a/sys/contrib/lomac/kernel_mediate.c b/sys/contrib/lomac/kernel_mediate.c deleted file mode 100644 index c13fa74..0000000 --- a/sys/contrib/lomac/kernel_mediate.c +++ /dev/null @@ -1,280 +0,0 @@ -/*- - * Copyright (c) 2001 Networks Associates Technology, Inc. - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * $FreeBSD$ - */ - -/* - * This file contains functions that make access control decisions - * concerning wether or not given system calls should be allowed - * or denied. This activity is called "mediation". These functions - * generally consider both the parameters passed to a system call - * and the current internal state of LOMAC in the course of making - * a decision. However, they do not modify these parameters or - * LOMAC's internal state. Functions for modifying LOMAC's internal - * state can be found in lomac_monitor.c. - * - */ - -#include "kernel_interface.h" -#include "kernel_mediate.h" -#if 0 -#include "lomac_plm.h" -#endif -#include "kernel_log.h" - -/* mediate_subject_level_subject() - * - * in: op_s - name of operation to mediate - * p_subject_one - subject one (for informational purposes only) - * level_one - already-known level of the first subject - * p_subject_two - subject two - * out: nothing - * return: value condition - * ----- --------- - * 0 caller should deny operation - * 1 caller should allow operation - * - * This function returns 1 if `p_subject_one's level is at least - * as great as `p_subject_two's level. Otherwise, it logs a permission - * failure on operation `op_s' and returns 0. - * - * This function is used to mediate pgrp changes. - * - */ - -int -mediate_subject_level_subject(const char *op_s, - const lomac_subject_t *p_subject_one, level_t level_one, - lomac_subject_t *p_subject_two) { - - lattr_t lattr_two; /* lattr of `p_subject_two' */ - int ret_val; /* result to return to caller */ - -#ifdef NO_MEDIATION - ret_val = 1; /* no denials, just logging */ -#else - ret_val = 0; /* pessimistically assume deny */ -#endif - - get_subject_lattr(p_subject_two, &lattr_two); - - if (lattr_two.level <= level_one) { - ret_val = 1; /* OK, allow */ - } else if (lomac_verbose_demote_deny) { - lomac_log_t *logmsg = log_start(); - - log_append_string(logmsg, "LOMAC: denied level-"); - log_append_int(logmsg, level_one); - log_append_string(logmsg, " proc "); - log_append_subject_id(logmsg, p_subject_one); - log_append_string(logmsg, " "); - log_append_string(logmsg, op_s); - log_append_string(logmsg, " to level-"); - log_append_int(logmsg, lattr_two.level); - log_append_string(logmsg, " proc "); - log_append_subject_id(logmsg, p_subject_two); - log_print(logmsg); - } - return (ret_val); -} /* mediate_subject_subject() */ - -/* mediate_subject_object() - * - * in: op_s - string describing operation, like "write" or "writev" - * p_subject - subject trying to operate on `p_object'. - * p_object - object that `p_subject' is trying to operate on. - * out: nothing - * return: value condition - * ----- --------- - * 0 Caller should prevent operation - * 1 Caller should permit operation - * - * This function returns 1 if the level of `p_object' is less than or - * equal to the level of `p_subject'. Otherwise, it returns 0 and - * logs a permission denial on `op_s'. - * - * This function allows LOMAC to mediate write and writev system calls. - * - */ - -int -mediate_subject_object(const char *op_s, lomac_subject_t *p_subject, - const lomac_object_t *p_object) { - lattr_t subject_lattr; /* lattr of `p_subject' */ - lattr_t object_lattr; /* lattr of `p_object' */ - int ret_val; /* value to return to caller */ - -#ifdef NO_MEDIATION - ret_val = 1; /* allow operation regardless of decision */ -#else - ret_val = 0; /* pessimistically assume deny */ -#endif - - /* Get the lattrs of `p_subject' and `p_object' so we can compare them. */ - get_subject_lattr(p_subject, &subject_lattr); - get_object_lattr(p_object, &object_lattr); - - /* - * If `p_subject's level is less than `p_object's level, - * we indicate that the operation must not be allowed. - */ - - if (!lomac_must_deny(&subject_lattr, &object_lattr) || - object_lattr.flags & LOMAC_ATTR_LOWWRITE) { - ret_val = 1; /* allow operation */ - } else if (lomac_verbose_demote_deny) { - lomac_log_t *logmsg = log_start(); - log_append_string(logmsg, "LOMAC: level-"); - log_append_int(logmsg, subject_lattr.level); - log_append_string(logmsg, " proc "); - log_append_subject_id(logmsg, p_subject); - log_append_string(logmsg, " denied "); - log_append_string(logmsg, op_s); - log_append_string(logmsg, " to level-"); - log_append_int(logmsg, object_lattr.level); - log_append_string(logmsg, " object "); - log_append_object_id(logmsg, p_object); - log_append_string(logmsg, "\n"); - log_print(logmsg); - } - return (ret_val); -} /* mediate_subject_object() */ - - -/* mediate_subject_object_open() - * - * in: p_subject - subject trying to operate on `p_object'. - * p_object - object that `p_subject' is trying to operate on. - * out: nothing - * return: value condition - * ----- --------- - * 0 Caller should prevent operation - * 1 Caller should permit operation - * - * This function returns 1 if the level of `p_object' is less than or - * equal to the level of `p_subject'. Otherwise, it returns 0 and - * logs a permission denial on `op_s'. - * - * This function allows LOMAC to mediate open system calls. - * - */ - -int -mediate_subject_object_open(lomac_subject_t *p_subject, - const lomac_object_t *p_object) { - lattr_t subject_lattr; /* lattr of `p_subject' */ - lattr_t object_lattr; /* lattr of `p_object' */ - int ret_val; /* value to return to caller */ - -#ifdef NO_MEDIATION - ret_val = 1; /* allow operation regardless of decision */ -#else - ret_val = 0; /* pessimistically assume deny */ -#endif - - /* Get the lattrs of `p_subject' and `p_object' so we can compare them. */ - get_subject_lattr(p_subject, &subject_lattr); - get_object_lattr(p_object, &object_lattr); - - /* - * If `p_subject's level is less than `p_object's level, - * we must indicate that the operation should not be allowed. - */ - if (lomac_must_deny(&subject_lattr, &object_lattr) && - object_lattr.flags & LOMAC_ATTR_LOWNOOPEN) { - if (lomac_verbose_demote_deny) { - lomac_log_t *logmsg = log_start(); - - log_append_string(logmsg, "LOMAC: level-"); - log_append_int(logmsg, subject_lattr.level); - log_append_string(logmsg, " proc "); - log_append_subject_id(logmsg, p_subject); - log_append_string(logmsg, " denied open to level-"); - log_append_int(logmsg, object_lattr.level); - log_append_string(logmsg, " object "); - log_append_object_id(logmsg, p_object); - log_append_string(logmsg, "\n"); - log_print(logmsg); - } - } else { - ret_val = 1; /* allow operation */ - } /* if/else allow/deny */ - return (ret_val); -} /* mediate_subject_object() */ - - -/* mediate_subject_at_level() - * - * in: op_s - name of operation being mediated - * p_subject - subject whose level we want to check - * target_level - level to compare to `p_subject's level - * - * out: nothing - * return: value condition - * ----- --------- - * 0 `p_subject' is not at `target_level' - * 1 `p_subject' is at `target_level' - * - * This function provides a predicate for determining whether or not - * `p_subject' is at the level specified by `target_level'. This - * function compares `p_subject's level to `target_level'. If the - * levels match, it retruns 1. Otherwise, it logs a permission denial - * on `op_s' and returns 0. - * - */ - -int -mediate_subject_at_level(const char *op_s, lomac_subject_t *p_subject, - const level_t target_level) { - lattr_t subject_lattr; /* lattr of `p_subject' */ - int ret_val; /* value returned to caller */ - -#ifdef NO_MEDIATION - ret_val = 1; /* allow operation regardless of decision */ -#else - ret_val = 0; /* pessimistically assume deny */ -#endif - - /* Make `subject_lattr' the lattr of `p_subject'. */ - get_subject_lattr(p_subject, &subject_lattr); - - /* compare with `target_lattr */ - if (subject_lattr.level == target_level) { - ret_val = 1; /* allow operation */ - } else if (lomac_verbose_demote_deny) { - lomac_log_t *logmsg = log_start(); - - log_append_string(logmsg, "LOMAC: denied level-"); - log_append_int(logmsg, subject_lattr.level); - log_append_string(logmsg, " proc "); - log_append_subject_id(logmsg, p_subject); - log_append_string(logmsg, "'s "); - log_append_string(logmsg, op_s); - log_append_string(logmsg, ".\n"); - log_print(logmsg); - } - return (ret_val); -} /* mediate_subject_at_level() */ |
