2 files changed, 316 insertions, 0 deletions
diff --git a/source4/libcli/security/config.mk b/source4/libcli/security/config.mk
index d7492038d3..7faecaf5f2 100644
--- a/source4/libcli/security/config.mk
+++ b/source4/libcli/security/config.mk
@@ -22,6 +22,7 @@ ADD_OBJ_FILES = security_token.o \
 		dom_sid.o \
 		access_check.o \
 		privilege.o \
+		sddl.o \
 		../../librpc/ndr/ndr_sec.o
 REQUIRED_SUBSYSTEMS = LIB_SECURITY_NDR
 # End SUBSYSTEM LIB_SECURITY
diff --git a/source4/libcli/security/sddl.c b/source4/libcli/security/sddl.c
new file mode 100644
index 0000000000..17df393de4
--- /dev/null
+++ b/source4/libcli/security/sddl.c
@@ -0,0 +1,315 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   security descriptor description language functions
+
+   Copyright (C) Andrew Tridgell 		2005
+      
+   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 2 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, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+#include "system/iconv.h"
+#include "librpc/gen_ndr/ndr_security.h"
+
+struct flag_map {
+	const char *name;
+	uint32_t flag;
+};
+
+/*
+  map a series of letter codes into a uint32_t
+*/
+static BOOL sddl_map_flags(const struct flag_map *map, const char *str, 
+			   uint32_t *flags, size_t *len)
+{
+	if (len) *len = 0;
+	*flags = 0;
+	while (str[0] && isupper(str[0])) {
+		int i;
+		for (i=0;map[i].name;i++) {
+			size_t l = strlen(map[i].name);
+			if (strncmp(map[i].name, str, l) == 0) {
+				*flags |= map[i].flag;
+				str += l;
+				if (len) *len += l;
+				break;
+			}
+		}
+		if (map[i].name == NULL) {
+			DEBUG(2, ("Unknown flag - %s\n", str));
+			return False;
+		}
+	}
+	return True;
+}
+
+/*
+  a mapping between the 2 letter SID codes and sid strings
+*/
+static const struct {
+	const char *code;
+	const char *sid;
+} sid_codes[] = {
+	{ "AO", SID_BUILTIN_ACCOUNT_OPERATORS },
+};
+
+/*
+  decode a SID
+  It can either be a special 2 letter code, or in S-* format
+*/
+static struct dom_sid *sddl_decode_sid(TALLOC_CTX *mem_ctx, const char **sddlp)
+{
+	const char *sddl = (*sddlp);
+	int i;
+
+	/* see if its in the numeric format */
+	if (strncmp(sddl, "S-", 2) == 0) {
+		size_t len = strspn(sddl+2, "-0123456789");
+		(*sddlp) += len+2;
+		return dom_sid_parse_talloc(mem_ctx, sddl);
+	}
+
+	/* now check for one of the special codes */
+	for (i=0;i<ARRAY_SIZE(sid_codes);i++) {
+		if (strncmp(sid_codes[i].code, sddl, 2)) break;
+	}
+	if (i == ARRAY_SIZE(sid_codes)) {
+		DEBUG(2,("Unknown sddl sid code '%2.2s'\n", sddl));
+		return NULL;
+	}
+
+	(*sddlp) += 2;
+	return dom_sid_parse_talloc(mem_ctx, sid_codes[i].sid);
+}
+
+static const struct flag_map ace_types[] = {
+	{ "A",  SEC_ACE_TYPE_ACCESS_ALLOWED },
+	{ "D",  SEC_ACE_TYPE_ACCESS_DENIED },
+	{ "AU", SEC_ACE_TYPE_SYSTEM_AUDIT },
+	{ "AL", SEC_ACE_TYPE_SYSTEM_ALARM },
+	{ "OA", SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT },
+	{ "OD", SEC_ACE_TYPE_ACCESS_DENIED_OBJECT },
+	{ "OU", SEC_ACE_TYPE_SYSTEM_AUDIT_OBJECT },
+	{ "OL", SEC_ACE_TYPE_SYSTEM_ALARM_OBJECT },
+	{ NULL, 0 }
+};
+
+static const struct flag_map ace_flags[] = {
+	{ "OI", SEC_ACE_FLAG_OBJECT_INHERIT },
+	{ "CI", SEC_ACE_FLAG_CONTAINER_INHERIT },
+	{ "NP", SEC_ACE_FLAG_NO_PROPAGATE_INHERIT },
+	{ "IO", SEC_ACE_FLAG_INHERIT_ONLY },
+	{ "ID", SEC_ACE_FLAG_INHERITED_ACE },
+	{ "SA", SEC_ACE_FLAG_SUCCESSFUL_ACCESS },
+	{ "FA", SEC_ACE_FLAG_FAILED_ACCESS },
+	{ NULL, 0 },
+};
+
+static const struct flag_map ace_access_mask[] = {
+	{ "RC", SEC_STD_READ_CONTROL },
+	{ "RP", SEC_ADS_READ_PROP },
+	{ "WP", SEC_ADS_WRITE_PROP },
+	{ "CR", SEC_ADS_CONTROL_ACCESS },
+	{ "CC", SEC_ADS_CREATE_CHILD },
+	{ "DC", SEC_ADS_DELETE_CHILD },
+	{ "LC", SEC_ADS_LIST },
+	{ "LO", SEC_ADS_LIST_OBJECT },
+	{ "WO", SEC_STD_WRITE_OWNER },
+	{ "WD", SEC_STD_WRITE_DAC },
+	{ "SD", SEC_STD_DELETE },
+	{ "DT", SEC_ADS_DELETE_TREE },
+	{ "SW", SEC_ADS_SELF_WRITE },
+	{ NULL, 0 }
+};
+
+/*
+  decode an ACE
+  return True on success, False on failure
+  note that this routine modifies the string
+*/
+static BOOL sddl_decode_ace(TALLOC_CTX *mem_ctx, struct security_ace *ace, char *str)
+{
+	ZERO_STRUCTP(ace);
+	const char *tok[6];
+	const char *s;
+	int i;
+	uint32_t v;
+	struct dom_sid *sid;
+
+	/* parse out the 6 tokens */
+	tok[0] = str;
+	for (i=0;i<5;i++) {
+		char *ptr = strchr(str, ';');
+		if (ptr == NULL) return False;
+		*ptr = 0;
+		str = ptr+1;
+		tok[i+1] = str;
+	}
+
+	/* parse ace type */
+	if (!sddl_map_flags(ace_types, tok[0], &v, NULL)) {
+		return False;
+	}
+	ace->type = v;
+
+	/* ace flags */
+	if (!sddl_map_flags(ace_flags, tok[1], &v, NULL)) {
+		return False;
+	}
+	ace->flags = v;
+	
+	/* access mask */
+	if (strncmp(tok[2], "0x", 2) == 0) {
+		ace->access_mask = strtol(tok[2], NULL, 16);
+	} else {
+		if (!sddl_map_flags(ace_access_mask, tok[2], &v, NULL)) {
+			return False;
+		}
+		ace->access_mask = v;
+	}
+
+	/* object */
+	if (tok[3][0] != 0) {
+		/* TODO: add object parsing ... */
+		return False;
+	}
+
+	/* inherit object */
+	if (tok[4][0] != 0) {
+		/* TODO: add object parsing ... */
+		return False;
+	}
+
+	/* trustee */
+	s = tok[5];
+	sid = sddl_decode_sid(mem_ctx, &s);
+	if (sid == NULL) {
+		return False;
+	}
+	ace->trustee = *sid;
+	talloc_steal(mem_ctx, sid->sub_auths);
+	talloc_free(sid);
+
+	return True;
+}
+
+static const struct flag_map acl_flags[] = {
+	{ "P", SEC_DESC_DACL_PROTECTED },
+	{ "AR", SEC_DESC_DACL_AUTO_INHERIT_REQ },
+	{ "AI", SEC_DESC_DACL_AUTO_INHERITED },
+	{ NULL, 0 }
+};
+
+/*
+  decode an ACL
+*/
+static struct security_acl *sddl_decode_acl(struct security_descriptor *sd, 
+					    const char **sddlp, uint32_t *flags)
+{
+	const char *sddl = *sddlp;
+	struct security_acl *acl;
+	size_t len;
+
+	acl = talloc_zero(sd, struct security_acl);
+	if (acl == NULL) return NULL;
+	acl->revision = SECURITY_ACL_REVISION_NT4;
+
+	/* work out the ACL flags */
+	if (!sddl_map_flags(acl_flags, sddl, flags, &len)) {
+		talloc_free(acl);
+		return NULL;
+	}
+	sddl += len;
+
+	/* now the ACEs */
+	while (*sddl == '(') {
+		len = strcspn(sddl+1, ")");
+		char *astr = talloc_strndup(acl, sddl+1, len);
+		if (astr == NULL || sddl[len+1] != ')') {
+			talloc_free(acl);
+			return NULL;
+		}
+		acl->aces = talloc_realloc(acl, acl->aces, struct security_ace, 
+					   acl->num_aces+1);
+		if (acl->aces == NULL) {
+			talloc_free(acl);
+			return NULL;
+		}
+		if (!sddl_decode_ace(acl->aces, &acl->aces[acl->num_aces], astr)) {
+			talloc_free(acl);
+			return NULL;
+		}
+		talloc_free(astr);
+		sddl += len+2;
+		acl->num_aces++;
+	}
+
+	(*sddlp) = sddl;
+	return acl;
+}
+
+/*
+  decode a security descriptor in SDDL format
+*/
+struct security_descriptor *sddl_decode(TALLOC_CTX *mem_ctx, const char *sddl)
+{
+	struct security_descriptor *sd;
+	sd = talloc_zero(mem_ctx, struct security_descriptor);
+
+	sd->revision = SECURITY_DESCRIPTOR_REVISION_1;
+	sd->type     = SEC_DESC_SELF_RELATIVE;
+	
+	while (*sddl) {
+		uint32_t flags;
+		char c = sddl[0];
+		if (sddl[1] != ':') goto failed;
+
+		sddl += 2;
+		switch (c) {
+		case 'D':
+			if (sd->dacl != NULL) goto failed;
+			sd->dacl = sddl_decode_acl(sd, &sddl, &flags);
+			if (sd->dacl == NULL) goto failed;
+			sd->type |= flags | SEC_DESC_DACL_PRESENT;
+			break;
+		case 'S':
+			if (sd->sacl != NULL) goto failed;
+			sd->sacl = sddl_decode_acl(sd, &sddl, &flags);
+			if (sd->sacl == NULL) goto failed;
+			/* this relies on the SEC_DESC_SACL_* flags being
+			   1 bit shifted from the SEC_DESC_DACL_* flags */
+			sd->type |= (flags<<1) | SEC_DESC_SACL_PRESENT;
+			break;
+		case 'O':
+			if (sd->owner_sid != NULL) goto failed;
+			sd->owner_sid = sddl_decode_sid(sd, &sddl);
+			if (sd->owner_sid == NULL) goto failed;
+			break;
+		case 'G':
+			if (sd->group_sid != NULL) goto failed;
+			sd->group_sid = sddl_decode_sid(sd, &sddl);
+			if (sd->group_sid == NULL) goto failed;
+			break;
+		}
+	}
+
+	return sd;
+
+failed:
+	DEBUG(2,("Badly formatted SDDL '%s'\n", sddl));
+	talloc_free(sd);
+	return NULL;
+}