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|
/*
ldb database library
Copyright (C) Simo Sorce 2005
** NOTE! The following LGPL license applies to the ldb
** library. This does NOT imply that all of Samba is released
** under the LGPL
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Name: ldb
*
* Component: ldb dn explode and utility functions
*
* Description: - explode a dn into it's own basic elements
* and put them in a structure
* - manipulate ldb_dn structures
*
* Author: Simo Sorce
*/
#include "includes.h"
#include "ldb/include/ldb.h"
#include "ldb/include/ldb_private.h"
#include <ctype.h>
#define LDB_DN_NULL_FAILED(x) if (!(x)) goto failed
#define LDB_SPECIAL "@SPECIAL"
int ldb_dn_is_special(const struct ldb_dn *dn)
{
if (dn == NULL || dn->comp_num != 1) return 0;
return ! strcmp(dn->components[0].name, LDB_SPECIAL);
}
int ldb_dn_check_special(const struct ldb_dn *dn, const char *check)
{
if (dn == NULL || dn->comp_num != 1) return 0;
return ! strcmp((char *)dn->components[0].value.data, check);
}
static int ldb_dn_is_valid_attribute_name(const char *name)
{
if (name == NULL) return 0;
while (*name) {
if (! isascii(*name)) {
return 0;
}
if (! (isalnum((unsigned char)*name) || *name == '-')) {
return 0;
}
name++;
}
return 1;
}
char *ldb_dn_escape_value(void *mem_ctx, struct ldb_val value)
{
const char *p, *s, *src;
char *d, *dst;
int len;
if (!value.length)
return NULL;
p = s = src = (const char *)value.data;
len = value.length;
/* allocate destination string, it will be at most 3 times the source */
dst = d = talloc_array(mem_ctx, char, len * 3 + 1);
LDB_DN_NULL_FAILED(dst);
while (p - src < len) {
p += strcspn(p, ",=\n+<>#;\\\"");
if (p - src == len) /* found no escapable chars */
break;
memcpy(d, s, p - s); /* copy the part of the string before the stop */
d += (p - s); /* move to current position */
if (*p) { /* it is a normal escapable character */
*d++ = '\\';
*d++ = *p++;
} else { /* we have a zero byte in the string */
strncpy(d, "\00", 3); /* escape the zero */
d = d + 3;
p++; /* skip the zero */
}
s = p; /* move forward */
}
/* copy the last part (with zero) and return */
memcpy(d, s, &src[len] - s + 1);
return dst;
failed:
talloc_free(dst);
return NULL;
}
static struct ldb_val ldb_dn_unescape_value(void *mem_ctx, const char *src)
{
struct ldb_val value;
unsigned x;
char *p, *dst = NULL, *end;
memset(&value, 0, sizeof(value));
LDB_DN_NULL_FAILED(src);
dst = p = talloc_memdup(mem_ctx, src, strlen(src) + 1);
LDB_DN_NULL_FAILED(dst);
end = &dst[strlen(dst)];
while (*p) {
p += strcspn(p, ",=\n+<>#;\\\"");
if (*p == '\\') {
if (strchr(",=\n+<>#;\\\"", p[1])) {
memmove(p, p + 1, end - (p + 1) + 1);
end--;
p++;
continue;
}
if (sscanf(p + 1, "%02x", &x) == 1) {
*p = (unsigned char)x;
memmove(p + 1, p + 3, end - (p + 3) + 1);
end -= 2;
p++;
continue;
}
}
/* a string with not escaped specials is invalid (tested) */
if (*p != '\0') {
goto failed;
}
}
value.length = end - dst;
value.data = (uint8_t *)dst;
return value;
failed:
talloc_free(dst);
return value;
}
/* check if the string contains quotes
* skips leading and trailing spaces
* - returns 0 if no quotes found
* - returns 1 if quotes are found and put their position
* in *quote_start and *quote_end parameters
* - return -1 if there are open quotes
*/
static int get_quotes_position(const char *source, int *quote_start, int *quote_end)
{
const char *p;
if (source == NULL || quote_start == NULL || quote_end == NULL) return -1;
p = source;
/* check if there are quotes surrounding the value */
p += strspn(p, " \n"); /* skip white spaces */
if (*p == '\"') {
*quote_start = p - source;
p++;
while (*p != '\"') {
p = strchr(p, '\"');
LDB_DN_NULL_FAILED(p);
if (*(p - 1) == '\\')
p++;
}
*quote_end = p - source;
return 1;
}
return 0;
failed:
return -1;
}
static char *seek_to_separator(char *string, const char *separators)
{
char *p;
int ret, qs, qe;
if (string == NULL || separators == NULL) return NULL;
p = strchr(string, '=');
LDB_DN_NULL_FAILED(p);
p++;
/* check if there are quotes surrounding the value */
ret = get_quotes_position(p, &qs, &qe);
if (ret == -1)
return NULL;
if (ret == 1) { /* quotes found */
p += qe; /* positioning after quotes */
p += strspn(p, " \n"); /* skip white spaces after the quote */
if (strcspn(p, separators) != 0) /* if there are characters between quotes */
return NULL; /* and separators, the dn is invalid */
return p; /* return on the separator */
}
/* no quotes found seek to separators */
ret = strcspn(p, separators);
if (ret == 0) /* no separators ?! bail out */
return NULL;
return p + ret;
failed:
return NULL;
}
static char *ldb_dn_trim_string(char *string, const char *edge)
{
char *s, *p;
/* seek out edge from start of string */
s = string + strspn(string, edge);
/* backwards skip from end of string */
p = &s[strlen(s) - 1];
while (p > s && strchr(edge, *p)) {
*p = '\0';
p--;
}
return s;
}
/* we choosed to not support multpile valued components */
static struct ldb_dn_component ldb_dn_explode_component(void *mem_ctx, char *raw_component)
{
struct ldb_dn_component dc;
char *p;
int ret, qs, qe;
memset(&dc, 0, sizeof(dc));
if (raw_component == NULL) {
return dc;
}
/* find attribute type/value separator */
p = strchr(raw_component, '=');
LDB_DN_NULL_FAILED(p);
*p++ = '\0'; /* terminate name and point to value */
/* copy and trim name in the component */
dc.name = talloc_strdup(mem_ctx, ldb_dn_trim_string(raw_component, " \n"));
if (!dc.name)
return dc;
if (! ldb_dn_is_valid_attribute_name(dc.name)) {
goto failed;
}
ret = get_quotes_position(p, &qs, &qe);
switch (ret) {
case 0: /* no quotes trim the string */
p = ldb_dn_trim_string(p, " \n");
dc.value = ldb_dn_unescape_value(mem_ctx, p);
break;
case 1: /* quotes found get the unquoted string */
p[qe] = '\0';
p = p + qs + 1;
dc.value.length = strlen(p);
dc.value.data = talloc_memdup(mem_ctx, p, dc.value.length + 1);
break;
default: /* mismatched quotes ot other error, bail out */
goto failed;
}
if (dc.value.length == 0) {
goto failed;
}
return dc;
failed:
talloc_free(dc.name);
dc.name = NULL;
return dc;
}
struct ldb_dn *ldb_dn_new(void *mem_ctx)
{
struct ldb_dn *edn;
edn = talloc(mem_ctx, struct ldb_dn);
LDB_DN_NULL_FAILED(edn);
/* Initially there are no components */
edn->comp_num = 0;
edn->components = NULL;
return edn;
failed:
return NULL;
}
struct ldb_dn *ldb_dn_explode(void *mem_ctx, const char *dn)
{
struct ldb_dn *edn; /* the exploded dn */
char *pdn, *p;
if (dn == NULL) return NULL;
/* Allocate a structure to hold the exploded DN */
edn = ldb_dn_new(mem_ctx);
pdn = NULL;
/* Empty DNs */
if (dn[0] == '\0') {
return edn;
}
/* Special DNs case */
if (dn[0] == '@') {
edn->comp_num = 1;
edn->components = talloc(edn, struct ldb_dn_component);
if (edn->components == NULL) goto failed;
edn->components[0].name = talloc_strdup(edn->components, LDB_SPECIAL);
if (edn->components[0].name == NULL) goto failed;
edn->components[0].value.data = (uint8_t *)talloc_strdup(edn->components, dn);
if (edn->components[0].value.data== NULL) goto failed;
edn->components[0].value.length = strlen(dn);
return edn;
}
pdn = p = talloc_strdup(edn, dn);
LDB_DN_NULL_FAILED(pdn);
/* get the components */
do {
char *t;
/* terminate the current component and return pointer to the next one */
t = seek_to_separator(p, ",;");
LDB_DN_NULL_FAILED(t);
if (*t) { /* here there is a separator */
*t = '\0'; /*terminate */
t++; /* a separtor means another component follows */
}
/* allocate space to hold the dn component */
edn->components = talloc_realloc(edn, edn->components,
struct ldb_dn_component,
edn->comp_num + 1);
if (edn->components == NULL)
goto failed;
/* store the exploded component in the main structure */
edn->components[edn->comp_num] = ldb_dn_explode_component(edn, p);
LDB_DN_NULL_FAILED(edn->components[edn->comp_num].name);
edn->comp_num++;
/* jump to the next component if any */
p = t;
} while(*p);
talloc_free(pdn);
return edn;
failed:
talloc_free(pdn);
talloc_free(edn);
return NULL;
}
char *ldb_dn_linearize(void *mem_ctx, const struct ldb_dn *edn)
{
char *dn, *value;
int i;
if (edn == NULL) return NULL;
/* Special DNs */
if (ldb_dn_is_special(edn)) {
dn = talloc_strdup(mem_ctx, (char *)edn->components[0].value.data);
return dn;
}
dn = talloc_strdup(mem_ctx, "");
LDB_DN_NULL_FAILED(dn);
for (i = 0; i < edn->comp_num; i++) {
value = ldb_dn_escape_value(dn, edn->components[i].value);
LDB_DN_NULL_FAILED(value);
if (i == 0) {
dn = talloc_asprintf_append(dn, "%s=%s", edn->components[i].name, value);
} else {
dn = talloc_asprintf_append(dn, ",%s=%s", edn->components[i].name, value);
}
LDB_DN_NULL_FAILED(dn);
talloc_free(value);
}
return dn;
failed:
talloc_free(dn);
return NULL;
}
/* compare DNs using casefolding compare functions */
int ldb_dn_compare_base(struct ldb_context *ldb,
const struct ldb_dn *base,
const struct ldb_dn *dn)
{
int ret;
int n0, n1;
if (base->comp_num > dn->comp_num) {
return (dn->comp_num - base->comp_num);
}
if (base == NULL || base->comp_num == 0) return 0;
if (dn == NULL || dn->comp_num == 0) return -1;
if (base->comp_num > dn->comp_num) return -1;
/* if the number of components doesn't match they differ */
n0 = base->comp_num - 1;
n1 = dn->comp_num - 1;
while (n0 >= 0 && n1 >= 0) {
const struct ldb_attrib_handler *h;
/* compare names (attribute names are guaranteed to be ASCII only) */
ret = ldb_caseless_cmp(base->components[n0].name,
dn->components[n1].name);
if (ret) {
return ret;
}
/* names match, compare values */
h = ldb_attrib_handler(ldb, base->components[n0].name);
ret = h->comparison_fn(ldb, ldb, &(base->components[n0].value),
&(dn->components[n1].value));
if (ret) {
return ret;
}
n1--;
n0--;
}
return 0;
}
int ldb_dn_compare(struct ldb_context *ldb,
const struct ldb_dn *edn0,
const struct ldb_dn *edn1)
{
if (edn0 == NULL || edn1 == NULL) return edn1 - edn0;
if (edn0->comp_num != edn1->comp_num)
return (edn1->comp_num - edn0->comp_num);
return ldb_dn_compare_base(ldb, edn0, edn1);
}
int ldb_dn_cmp(struct ldb_context *ldb, const char *dn0, const char *dn1)
{
struct ldb_dn *edn0;
struct ldb_dn *edn1;
int ret;
if (dn0 == NULL || dn1 == NULL) return dn1 - dn0;
edn0 = ldb_dn_explode_casefold(ldb, dn0);
if (edn0 == NULL) return 1;
edn1 = ldb_dn_explode_casefold(ldb, dn1);
if (edn1 == NULL) {
talloc_free(edn0);
return -1;
}
ret = ldb_dn_compare(ldb, edn0, edn1);
talloc_free(edn0);
talloc_free(edn1);
return ret;
}
/*
casefold a dn. We need to casefold the attribute names, and canonicalize
attribute values of case insensitive attributes.
*/
struct ldb_dn *ldb_dn_casefold(struct ldb_context *ldb, const struct ldb_dn *edn)
{
struct ldb_dn *cedn;
int i;
if (edn == NULL) return NULL;
cedn = ldb_dn_new(ldb);
LDB_DN_NULL_FAILED(cedn);
cedn->comp_num = edn->comp_num;
cedn->components = talloc_array(cedn, struct ldb_dn_component, edn->comp_num);
LDB_DN_NULL_FAILED(cedn->components);
for (i = 0; i < edn->comp_num; i++) {
struct ldb_dn_component dc;
const struct ldb_attrib_handler *h;
dc.name = ldb_casefold(cedn, edn->components[i].name);
LDB_DN_NULL_FAILED(dc.name);
h = ldb_attrib_handler(ldb, dc.name);
if (h->canonicalise_fn(ldb, cedn, &(edn->components[i].value), &(dc.value)) != 0) {
goto failed;
}
cedn->components[i] = dc;
}
return cedn;
failed:
talloc_free(cedn);
return NULL;
}
struct ldb_dn *ldb_dn_explode_casefold(struct ldb_context *ldb, const char *dn)
{
struct ldb_dn *edn, *cdn;
if (dn == NULL) return NULL;
edn = ldb_dn_explode(ldb, dn);
if (edn == NULL) return NULL;
cdn = ldb_dn_casefold(ldb, edn);
talloc_free(edn);
return cdn;
}
char *ldb_dn_linearize_casefold(struct ldb_context *ldb, const struct ldb_dn *edn)
{
struct ldb_dn *cdn;
char *dn;
if (edn == NULL) return NULL;
/* Special DNs */
if (ldb_dn_is_special(edn)) {
dn = talloc_strdup(ldb, (char *)edn->components[0].value.data);
return dn;
}
cdn = ldb_dn_casefold(ldb, edn);
if (cdn == NULL) return NULL;
dn = ldb_dn_linearize(ldb, cdn);
if (dn == NULL) {
talloc_free(cdn);
return NULL;
}
talloc_free(cdn);
return dn;
}
static struct ldb_dn_component ldb_dn_copy_component(void *mem_ctx, struct ldb_dn_component *src)
{
struct ldb_dn_component dst;
memset(&dst, 0, sizeof(dst));
if (src == NULL) {
return dst;
}
dst.value = ldb_val_dup(mem_ctx, &(src->value));
if (dst.value.data == NULL) {
return dst;
}
dst.name = talloc_strdup(mem_ctx, src->name);
if (dst.name == NULL) {
talloc_free(dst.value.data);
}
return dst;
}
/* copy specified number of elements of a dn into a new one
element are copied from top level up to the unique rdn
num_el may be greater then dn->comp_num (see ldb_dn_make_child)
*/
struct ldb_dn *ldb_dn_copy_partial(void *mem_ctx, const struct ldb_dn *dn, int num_el)
{
struct ldb_dn *new;
int i, n, e;
if (dn == NULL) return NULL;
if (num_el <= 0) return NULL;
new = ldb_dn_new(mem_ctx);
LDB_DN_NULL_FAILED(new);
new->comp_num = num_el;
n = new->comp_num - 1;
new->components = talloc_array(new, struct ldb_dn_component, new->comp_num);
if (dn->comp_num == 0) return new;
e = dn->comp_num - 1;
for (i = 0; i < new->comp_num; i++) {
new->components[n - i] = ldb_dn_copy_component(new->components,
&(dn->components[e - i]));
if ((e - i) == 0) {
return new;
}
}
return new;
failed:
talloc_free(new);
return NULL;
}
struct ldb_dn *ldb_dn_copy(void *mem_ctx, const struct ldb_dn *dn)
{
if (dn == NULL) return NULL;
return ldb_dn_copy_partial(mem_ctx, dn, dn->comp_num);
}
struct ldb_dn *ldb_dn_get_parent(void *mem_ctx, const struct ldb_dn *dn)
{
if (dn == NULL) return NULL;
return ldb_dn_copy_partial(mem_ctx, dn, dn->comp_num - 1);
}
struct ldb_dn_component *ldb_dn_build_component(void *mem_ctx, const char *attr,
const char *val)
{
struct ldb_dn_component *dc;
if (attr == NULL || val == NULL) return NULL;
dc = talloc(mem_ctx, struct ldb_dn_component);
if (dc == NULL) return NULL;
dc->name = talloc_strdup(dc, attr);
if (dc->name == NULL) {
talloc_free(dc);
return NULL;
}
dc->value.data = (uint8_t *)talloc_strdup(dc, val);
if (dc->value.data == NULL) {
talloc_free(dc);
return NULL;
}
dc->value.length = strlen(val);
return dc;
}
struct ldb_dn *ldb_dn_build_child(void *mem_ctx, const char *attr,
const char * value,
const struct ldb_dn *base)
{
struct ldb_dn *new;
if (! ldb_dn_is_valid_attribute_name(attr)) return NULL;
if (value == NULL || value == '\0') return NULL;
if (base != NULL) {
new = ldb_dn_copy_partial(mem_ctx, base, base->comp_num + 1);
LDB_DN_NULL_FAILED(new);
} else {
new = ldb_dn_new(mem_ctx);
LDB_DN_NULL_FAILED(new);
new->comp_num = 1;
new->components = talloc_array(new, struct ldb_dn_component, new->comp_num);
}
new->components[0].name = talloc_strdup(new->components, attr);
LDB_DN_NULL_FAILED(new->components[0].name);
new->components[0].value.data = (uint8_t *)talloc_strdup(new->components, value);
LDB_DN_NULL_FAILED(new->components[0].value.data);
new->components[0].value.length = strlen((char *)new->components[0].value.data);
return new;
failed:
talloc_free(new);
return NULL;
}
struct ldb_dn *ldb_dn_make_child(void *mem_ctx, const struct ldb_dn_component *component,
const struct ldb_dn *base)
{
if (component == NULL) return NULL;
return ldb_dn_build_child(mem_ctx, component->name,
(char *)component->value.data, base);
}
struct ldb_dn *ldb_dn_compose(void *mem_ctx, const struct ldb_dn *dn1, const struct ldb_dn *dn2)
{
int i;
struct ldb_dn *new;
if (dn2 == NULL && dn1 == NULL) {
return NULL;
}
if (dn2 == NULL) {
new = ldb_dn_new(mem_ctx);
LDB_DN_NULL_FAILED(new);
new->comp_num = dn1->comp_num;
new->components = talloc_array(new, struct ldb_dn_component, new->comp_num);
} else {
int comp_num = dn2->comp_num;
if (dn1 != NULL) comp_num += dn1->comp_num;
new = ldb_dn_copy_partial(mem_ctx, dn2, comp_num);
}
if (dn1 == NULL) {
return new;
}
for (i = 0; i < dn1->comp_num; i++) {
new->components[i] = ldb_dn_copy_component(new->components,
&(dn1->components[i]));
}
return new;
failed:
talloc_free(new);
return NULL;
}
struct ldb_dn *ldb_dn_string_compose(void *mem_ctx, const struct ldb_dn *base, const char *child_fmt, ...)
{
struct ldb_dn *dn;
char *child_str;
va_list ap;
int ret;
if (child_fmt == NULL) return NULL;
va_start(ap, child_fmt);
ret = vasprintf(&child_str, child_fmt, ap);
va_end(ap);
if (ret <= 0) return NULL;
dn = ldb_dn_compose(mem_ctx, ldb_dn_explode(mem_ctx, child_str), base);
free(child_str);
return dn;
}
struct ldb_dn_component *ldb_dn_get_rdn(void *mem_ctx, const struct ldb_dn *dn)
{
struct ldb_dn_component *rdn;
if (dn == NULL) return NULL;
if (dn->comp_num < 1) {
return NULL;
}
rdn = talloc(mem_ctx, struct ldb_dn_component);
if (rdn == NULL) return NULL;
*rdn = ldb_dn_copy_component(mem_ctx, &dn->components[0]);
if (rdn->name == NULL) {
talloc_free(rdn);
return NULL;
}
return rdn;
}
static char *ldb_dn_canonical(void *mem_ctx, const struct ldb_dn *dn, int ex_format) {
int i;
char *cracked = NULL;
for (i = dn->comp_num - 1 ; i >= 0; i--) {
if (strcasecmp(dn->components[i].name, "dc") != 0) {
break;
}
if (cracked) {
cracked = talloc_asprintf(mem_ctx, "%s.%s", dn->components[i].value.data,
cracked);
} else {
cracked = talloc_strdup(mem_ctx, dn->components[i].value.data);
}
if (!cracked) {
return NULL;
}
}
/* Only domain components */
if (i < 0) {
if (ex_format) {
cracked = talloc_asprintf(mem_ctx, "%s\n", cracked);
} else {
cracked = talloc_asprintf(mem_ctx, "%s/", cracked);
}
return cracked;
}
for (; i > 0; i--) {
cracked = talloc_asprintf(mem_ctx, "%s/%s", cracked,
dn->components[i].value.data);
if (!cracked) {
return NULL;
}
}
/* Last one */
if (ex_format) {
cracked = talloc_asprintf(mem_ctx, "%s\n%s", cracked,
dn->components[i].value.data);
} else {
cracked = talloc_asprintf(mem_ctx, "%s/%s", cracked,
dn->components[i].value.data);
}
return cracked;
}
char *ldb_dn_canonical_string(void *mem_ctx, const struct ldb_dn *dn) {
return ldb_dn_canonical(mem_ctx, dn, 0);
}
char *ldb_dn_canonical_ex_string(void *mem_ctx, const struct ldb_dn *dn) {
return ldb_dn_canonical(mem_ctx, dn, 1);
}
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