From a879a4610dac03b814ad40800f408416d250c6be Mon Sep 17 00:00:00 2001 From: Andrew Bartlett Date: Sat, 18 Sep 2010 12:55:31 +1000 Subject: libcli/auth Merge source4/libcli/security and util_sid.c into the common code This should ensure we only have one copy of these core functions in the tree. Andrew Bartlett Signed-off-by: Andrew Tridgell --- source4/libcli/security/access_check.c | 316 --------------------------------- 1 file changed, 316 deletions(-) delete mode 100644 source4/libcli/security/access_check.c (limited to 'source4/libcli/security/access_check.c') diff --git a/source4/libcli/security/access_check.c b/source4/libcli/security/access_check.c deleted file mode 100644 index 5ae318be43..0000000000 --- a/source4/libcli/security/access_check.c +++ /dev/null @@ -1,316 +0,0 @@ -/* - Unix SMB/CIFS implementation. - - security access checking routines - - Copyright (C) Andrew Tridgell 2004 - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 3 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program. If not, see . -*/ - -#include "includes.h" -#include "libcli/security/security.h" - -/* - perform a SEC_FLAG_MAXIMUM_ALLOWED access check -*/ -static uint32_t access_check_max_allowed(const struct security_descriptor *sd, - const struct security_token *token) -{ - uint32_t denied = 0, granted = 0; - uint32_t i; - - if (security_token_has_sid(token, sd->owner_sid)) { - granted |= SEC_STD_WRITE_DAC | SEC_STD_READ_CONTROL | SEC_STD_DELETE; - } else if (security_token_has_privilege(token, SEC_PRIV_RESTORE)) { - granted |= SEC_STD_DELETE; - } - - if (sd->dacl == NULL) { - return granted & ~denied; - } - - for (i = 0;idacl->num_aces; i++) { - struct security_ace *ace = &sd->dacl->aces[i]; - - if (ace->flags & SEC_ACE_FLAG_INHERIT_ONLY) { - continue; - } - - if (!security_token_has_sid(token, &ace->trustee)) { - continue; - } - - switch (ace->type) { - case SEC_ACE_TYPE_ACCESS_ALLOWED: - granted |= ace->access_mask; - break; - case SEC_ACE_TYPE_ACCESS_DENIED: - case SEC_ACE_TYPE_ACCESS_DENIED_OBJECT: - denied |= ace->access_mask; - break; - default: /* Other ACE types not handled/supported */ - break; - } - } - - return granted & ~denied; -} - -static const struct GUID *get_ace_object_type(struct security_ace *ace) -{ - struct GUID *type; - - if (ace->object.object.flags & SEC_ACE_OBJECT_TYPE_PRESENT) - type = &ace->object.object.type.type; - else if (ace->object.object.flags & SEC_ACE_INHERITED_OBJECT_TYPE_PRESENT) - type = &ace->object.object.inherited_type.inherited_type; /* This doesn't look right. Is something wrong with the IDL? */ - else - type = NULL; - - return type; - -} - -/* - The main entry point for access checking. If returning ACCESS_DENIED - this function returns the denied bits in the uint32_t pointed - to by the access_granted pointer. -*/ -NTSTATUS se_access_check(const struct security_descriptor *sd, - const struct security_token *token, - uint32_t access_desired, - uint32_t *access_granted) -{ - uint32_t i; - uint32_t bits_remaining; - - *access_granted = access_desired; - bits_remaining = access_desired; - - /* handle the maximum allowed flag */ - if (access_desired & SEC_FLAG_MAXIMUM_ALLOWED) { - uint32_t orig_access_desired = access_desired; - - access_desired |= access_check_max_allowed(sd, token); - access_desired &= ~SEC_FLAG_MAXIMUM_ALLOWED; - *access_granted = access_desired; - bits_remaining = access_desired & ~SEC_STD_DELETE; - - DEBUG(10,("se_access_check: MAX desired = 0x%x, granted = 0x%x, remaining = 0x%x\n", - orig_access_desired, - *access_granted, - bits_remaining)); - } - - if (access_desired & SEC_FLAG_SYSTEM_SECURITY) { - if (security_token_has_privilege(token, SEC_PRIV_SECURITY)) { - bits_remaining &= ~SEC_FLAG_SYSTEM_SECURITY; - } else { - return NT_STATUS_PRIVILEGE_NOT_HELD; - } - } - - /* a NULL dacl allows access */ - if ((sd->type & SEC_DESC_DACL_PRESENT) && sd->dacl == NULL) { - *access_granted = access_desired; - return NT_STATUS_OK; - } - - /* the owner always gets SEC_STD_WRITE_DAC, SEC_STD_READ_CONTROL and SEC_STD_DELETE */ - if ((bits_remaining & (SEC_STD_WRITE_DAC|SEC_STD_READ_CONTROL|SEC_STD_DELETE)) && - security_token_has_sid(token, sd->owner_sid)) { - bits_remaining &= ~(SEC_STD_WRITE_DAC|SEC_STD_READ_CONTROL|SEC_STD_DELETE); - } - if ((bits_remaining & SEC_STD_DELETE) && - (security_token_has_privilege(token, SEC_PRIV_RESTORE))) { - bits_remaining &= ~SEC_STD_DELETE; - } - if ((bits_remaining & SEC_RIGHTS_PRIV_RESTORE) && - security_token_has_privilege(token, SEC_PRIV_RESTORE)) { - bits_remaining &= ~(SEC_RIGHTS_PRIV_RESTORE); - } - if ((bits_remaining & SEC_RIGHTS_PRIV_BACKUP) && - security_token_has_privilege(token, SEC_PRIV_BACKUP)) { - bits_remaining &= ~(SEC_RIGHTS_PRIV_BACKUP); - } - - if (sd->dacl == NULL) { - goto done; - } - - /* check each ace in turn. */ - for (i=0; bits_remaining && i < sd->dacl->num_aces; i++) { - struct security_ace *ace = &sd->dacl->aces[i]; - - if (ace->flags & SEC_ACE_FLAG_INHERIT_ONLY) { - continue; - } - - if (!security_token_has_sid(token, &ace->trustee)) { - continue; - } - - switch (ace->type) { - case SEC_ACE_TYPE_ACCESS_ALLOWED: - bits_remaining &= ~ace->access_mask; - break; - case SEC_ACE_TYPE_ACCESS_DENIED: - case SEC_ACE_TYPE_ACCESS_DENIED_OBJECT: - if (bits_remaining & ace->access_mask) { - return NT_STATUS_ACCESS_DENIED; - } - break; - default: /* Other ACE types not handled/supported */ - break; - } - } - -done: - if (bits_remaining != 0) { - *access_granted = bits_remaining; - return NT_STATUS_ACCESS_DENIED; - } - - return NT_STATUS_OK; -} - -/* modified access check for the purposes of DS security - * Lots of code duplication, it will ve united in just one - * function eventually */ - -NTSTATUS sec_access_check_ds(const struct security_descriptor *sd, - const struct security_token *token, - uint32_t access_desired, - uint32_t *access_granted, - struct object_tree *tree, - struct dom_sid *replace_sid) -{ - uint32_t i; - uint32_t bits_remaining; - struct object_tree *node; - const struct GUID *type; - struct dom_sid *ps_sid = dom_sid_parse_talloc(NULL, SID_NT_SELF); - - *access_granted = access_desired; - bits_remaining = access_desired; - - /* handle the maximum allowed flag */ - if (access_desired & SEC_FLAG_MAXIMUM_ALLOWED) { - access_desired |= access_check_max_allowed(sd, token); - access_desired &= ~SEC_FLAG_MAXIMUM_ALLOWED; - *access_granted = access_desired; - bits_remaining = access_desired & ~SEC_STD_DELETE; - } - - if (access_desired & SEC_FLAG_SYSTEM_SECURITY) { - if (security_token_has_privilege(token, SEC_PRIV_SECURITY)) { - bits_remaining &= ~SEC_FLAG_SYSTEM_SECURITY; - } else { - return NT_STATUS_PRIVILEGE_NOT_HELD; - } - } - - /* a NULL dacl allows access */ - if ((sd->type & SEC_DESC_DACL_PRESENT) && sd->dacl == NULL) { - *access_granted = access_desired; - return NT_STATUS_OK; - } - - /* the owner always gets SEC_STD_WRITE_DAC, SEC_STD_READ_CONTROL and SEC_STD_DELETE */ - if ((bits_remaining & (SEC_STD_WRITE_DAC|SEC_STD_READ_CONTROL|SEC_STD_DELETE)) && - security_token_has_sid(token, sd->owner_sid)) { - bits_remaining &= ~(SEC_STD_WRITE_DAC|SEC_STD_READ_CONTROL|SEC_STD_DELETE); - } - if ((bits_remaining & SEC_STD_DELETE) && - security_token_has_privilege(token, SEC_PRIV_RESTORE)) { - bits_remaining &= ~SEC_STD_DELETE; - } - - if (sd->dacl == NULL) { - goto done; - } - - /* check each ace in turn. */ - for (i=0; bits_remaining && i < sd->dacl->num_aces; i++) { - struct dom_sid *trustee; - struct security_ace *ace = &sd->dacl->aces[i]; - - if (ace->flags & SEC_ACE_FLAG_INHERIT_ONLY) { - continue; - } - if (dom_sid_equal(&ace->trustee, ps_sid) && replace_sid) { - trustee = replace_sid; - } - else - { - trustee = &ace->trustee; - } - if (!security_token_has_sid(token, trustee)) { - continue; - } - - switch (ace->type) { - case SEC_ACE_TYPE_ACCESS_ALLOWED: - if (tree) - object_tree_modify_access(tree, ace->access_mask); - - bits_remaining &= ~ace->access_mask; - break; - case SEC_ACE_TYPE_ACCESS_DENIED: - if (bits_remaining & ace->access_mask) { - return NT_STATUS_ACCESS_DENIED; - } - break; - case SEC_ACE_TYPE_ACCESS_DENIED_OBJECT: - case SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT: - /* check only in case we have provided a tree, - * the ACE has an object type and that type - * is in the tree */ - type = get_ace_object_type(ace); - - if (!tree) - continue; - - if (!type) - node = tree; - else - if (!(node = get_object_tree_by_GUID(tree, type))) - continue; - - if (ace->type == SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT) { - object_tree_modify_access(node, ace->access_mask); - if (node->remaining_access == 0) { - return NT_STATUS_OK; - } - } - else { - if (node->remaining_access & ace->access_mask){ - return NT_STATUS_ACCESS_DENIED; - } - } - break; - default: /* Other ACE types not handled/supported */ - break; - } - } - -done: - if (bits_remaining != 0) { - return NT_STATUS_ACCESS_DENIED; - } - - return NT_STATUS_OK; -} - -- cgit