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-rw-r--r--source3/lib/tldap.c714
1 files changed, 600 insertions, 114 deletions
diff --git a/source3/lib/tldap.c b/source3/lib/tldap.c
index fa56763a33..3b256c4a42 100644
--- a/source3/lib/tldap.c
+++ b/source3/lib/tldap.c
@@ -956,175 +956,654 @@ int tldap_simple_bind(struct tldap_context *ld, const char *dn,
/*****************************************************************************/
-/*
- * This piece has a dependency on ldb, the ldb_parse_tree() function is used.
- * In case we want to separate out tldap, we need to copy or rewrite it.
+/* can't use isalpha() as only a strict set is valid for LDAP */
+#define TLDAP_IS_ALPHA(c) ((((c) >= 'a') && ((c) <= 'z')) || \
+ (((c) >= 'A') && ((c) <= 'Z')))
+
+#define TLDAP_IS_ADH(c) (TLDAP_IS_ALPHA(c) || isdigit(c) || (c) == '-')
+
+#define TLDAP_FILTER_AND ASN1_CONTEXT(0)
+#define TLDAP_FILTER_OR ASN1_CONTEXT(1)
+#define TLDAP_FILTER_NOT ASN1_CONTEXT(2)
+#define TLDAP_FILTER_EQ ASN1_CONTEXT(3)
+#define TLDAP_FILTER_SUB ASN1_CONTEXT(4)
+#define TLDAP_FILTER_LE ASN1_CONTEXT(5)
+#define TLDAP_FILTER_GE ASN1_CONTEXT(6)
+#define TLDAP_FILTER_PRES ASN1_CONTEXT_SIMPLE(7)
+#define TLDAP_FILTER_APX ASN1_CONTEXT(8)
+#define TLDAP_FILTER_EXT ASN1_CONTEXT(9)
+
+#define TLDAP_SUB_INI ASN1_CONTEXT_SIMPLE(0)
+#define TLDAP_SUB_ANY ASN1_CONTEXT_SIMPLE(1)
+#define TLDAP_SUB_FIN ASN1_CONTEXT_SIMPLE(2)
+
+
+/* oid's should be numerical only in theory,
+ * but apparently some broken servers may have alphanum aliases instead.
+ * Do like openldap libraries and allow alphanum aliases for oids, but
+ * do not allow Tagging options in that case.
*/
+static bool tldap_is_attrdesc(const char *s, int len, bool no_tagopts)
+{
+ bool is_oid = false;
+ bool dot = false;
+ int i;
+
+ /* first char has stricter rules */
+ if (isdigit(*s)) {
+ is_oid = true;
+ } else if (!TLDAP_IS_ALPHA(*s)) {
+ /* bad first char */
+ return false;
+ }
+
+ for (i = 1; i < len; i++) {
+
+ if (is_oid) {
+ if (isdigit(s[i])) {
+ dot = false;
+ continue;
+ }
+ if (s[i] == '.') {
+ if (dot) {
+ /* malformed */
+ return false;
+ }
+ dot = true;
+ continue;
+ }
+ } else {
+ if (TLDAP_IS_ADH(s[i])) {
+ continue;
+ }
+ }
+
+ if (s[i] == ';') {
+ if (no_tagopts) {
+ /* no tagging options */
+ return false;
+ }
+ if (dot) {
+ /* malformed */
+ return false;
+ }
+ if ((i + 1) == len) {
+ /* malformed */
+ return false;
+ }
-#include "lib/ldb/include/ldb.h"
-#include "lib/ldb/include/ldb_errors.h"
+ is_oid = false;
+ continue;
+ }
+ }
-static bool ldap_push_filter(struct asn1_data *data,
- struct ldb_parse_tree *tree)
+ if (dot) {
+ /* malformed */
+ return false;
+ }
+
+ return true;
+}
+
+/* this function copies the value until the closing parenthesis is found. */
+static char *tldap_get_val(TALLOC_CTX *memctx,
+ const char *value, const char **_s)
{
- int i;
+ const char *s = value;
- switch (tree->operation) {
- case LDB_OP_AND:
- case LDB_OP_OR:
- asn1_push_tag(data,
- ASN1_CONTEXT(tree->operation==LDB_OP_AND?0:1));
- for (i=0; i<tree->u.list.num_elements; i++) {
- if (!ldap_push_filter(data,
- tree->u.list.elements[i])) {
+ /* find terminator */
+ while (*s) {
+ s = strchr(s, ')');
+ if (s && (*(s - 1) == '\\')) {
+ continue;
+ }
+ break;
+ }
+ if (!s || !(*s == ')')) {
+ /* malformed filter */
+ return NULL;
+ }
+
+ *_s = s;
+
+ return talloc_strndup(memctx, value, s - value);
+}
+
+static int tldap_hex2char(const char *x)
+{
+ if (isxdigit(x[0]) && isxdigit(x[1])) {
+ const char h1 = x[0], h2 = x[1];
+ int c;
+
+ if (h1 >= 'a') c = h1 - (int)'a' + 10;
+ else if (h1 >= 'A') c = h1 - (int)'A' + 10;
+ else if (h1 >= '0') c = h1 - (int)'0';
+ c = c << 4;
+ if (h2 >= 'a') c += h2 - (int)'a' + 10;
+ else if (h1 >= 'A') c += h2 - (int)'A' + 10;
+ else if (h1 >= '0') c += h2 - (int)'0';
+
+ return c;
+ }
+
+ return -1;
+}
+
+static bool tldap_find_first_star(const char *val, const char **star)
+{
+ const char *s;
+
+ for (s = val; *s; s++) {
+ switch (*s) {
+ case '\\':
+ if (isxdigit(s[1]) && isxdigit(s[2])) {
+ s += 2;
+ break;
+ }
+ /* not hex based escape, check older syntax */
+ switch (s[1]) {
+ case '(':
+ case ')':
+ case '*':
+ case '\\':
+ s++;
+ break;
+ default:
+ /* invalid escape sequence */
return false;
}
+ break;
+ case ')':
+ /* end of val, nothing found */
+ *star = s;
+ return true;
+
+ case '*':
+ *star = s;
+ return true;
}
- asn1_pop_tag(data);
+ }
+
+ /* string ended without closing parenthesis, filter is malformed */
+ return false;
+}
+
+static bool tldap_unescape_inplace(char *value, size_t *val_len)
+{
+ int c, i, p;
+
+ for (i = 0,p = 0; i < *val_len; i++) {
+
+ switch (value[i]) {
+ case '(':
+ case ')':
+ case '*':
+ /* these must be escaped */
+ return false;
+
+ case '\\':
+ if (!value[i + 1]) {
+ /* invalid EOL */
+ return false;
+ }
+ i++;
+
+ c = tldap_hex2char(&value[i]);
+ if (c >= 0 && c < 256) {
+ value[p] = c;
+ i++;
+ p++;
+ break;
+ }
+
+ switch (value[i]) {
+ case '(':
+ case ')':
+ case '*':
+ case '\\':
+ value[p] = value[i];
+ p++;
+ default:
+ /* invalid */
+ return false;
+ }
+ break;
+
+ default:
+ value[p] = value[i];
+ p++;
+ }
+ }
+ value[p] = '\0';
+ *val_len = p;
+ return true;
+}
+
+static bool tldap_push_filter_basic(struct tldap_context *ld,
+ struct asn1_data *data,
+ const char **_s);
+static bool tldap_push_filter_substring(struct tldap_context *ld,
+ struct asn1_data *data,
+ const char *val,
+ const char **_s);
+static bool tldap_push_filter_int(struct tldap_context *ld,
+ struct asn1_data *data,
+ const char **_s)
+{
+ const char *s = *_s;
+ bool ret;
+
+ if (*s != '(') {
+ tldap_debug(ld, TLDAP_DEBUG_ERROR,
+ "Incomplete or malformed filter\n");
+ return false;
+ }
+ s++;
+
+ /* we are right after a parenthesis,
+ * find out what op we have at hand */
+ switch (*s) {
+ case '&':
+ tldap_debug(ld, TLDAP_DEBUG_TRACE, "Filter op: AND\n");
+ asn1_push_tag(data, TLDAP_FILTER_AND);
+ s++;
break;
- case LDB_OP_NOT:
- asn1_push_tag(data, ASN1_CONTEXT(2));
- if (!ldap_push_filter(data, tree->u.isnot.child)) {
+ case '|':
+ tldap_debug(ld, TLDAP_DEBUG_TRACE, "Filter op: OR\n");
+ asn1_push_tag(data, TLDAP_FILTER_OR);
+ s++;
+ break;
+
+ case '!':
+ tldap_debug(ld, TLDAP_DEBUG_TRACE, "Filter op: NOT\n");
+ asn1_push_tag(data, TLDAP_FILTER_NOT);
+ s++;
+ ret = tldap_push_filter_int(ld, data, &s);
+ if (!ret) {
return false;
}
asn1_pop_tag(data);
- break;
+ goto done;
+
+ case '(':
+ case ')':
+ tldap_debug(ld, TLDAP_DEBUG_ERROR,
+ "Invalid parenthesis '%c'\n", *s);
+ return false;
+
+ case '\0':
+ tldap_debug(ld, TLDAP_DEBUG_ERROR,
+ "Invalid filter termination\n");
+ return false;
- case LDB_OP_EQUALITY:
- /* equality test */
- asn1_push_tag(data, ASN1_CONTEXT(3));
- asn1_write_OctetString(data, tree->u.equality.attr,
- strlen(tree->u.equality.attr));
- asn1_write_OctetString(data, tree->u.equality.value.data,
- tree->u.equality.value.length);
+ default:
+ ret = tldap_push_filter_basic(ld, data, &s);
+ if (!ret) {
+ return false;
+ }
+ goto done;
+ }
+
+ /* only and/or filters get here.
+ * go through the list of filters */
+
+ if (*s == ')') {
+ /* RFC 4526: empty and/or */
asn1_pop_tag(data);
- break;
+ goto done;
+ }
- case LDB_OP_SUBSTRING:
- /*
- SubstringFilter ::= SEQUENCE {
- type AttributeDescription,
- -- at least one must be present
- substrings SEQUENCE OF CHOICE {
- initial [0] LDAPString,
- any [1] LDAPString,
- final [2] LDAPString } }
- */
- asn1_push_tag(data, ASN1_CONTEXT(4));
- asn1_write_OctetString(data, tree->u.substring.attr,
- strlen(tree->u.substring.attr));
- asn1_push_tag(data, ASN1_SEQUENCE(0));
- i = 0;
- if (!tree->u.substring.start_with_wildcard) {
- asn1_push_tag(data, ASN1_CONTEXT_SIMPLE(0));
- asn1_write_DATA_BLOB_LDAPString(
- data, tree->u.substring.chunks[i]);
- asn1_pop_tag(data);
- i++;
+ while (*s) {
+ ret = tldap_push_filter_int(ld, data, &s);
+ if (!ret) {
+ return false;
}
- while (tree->u.substring.chunks[i]) {
- int ctx;
- if ((!tree->u.substring.chunks[i + 1]) &&
- (tree->u.substring.end_with_wildcard == 0)) {
- ctx = 2;
- } else {
- ctx = 1;
- }
- asn1_push_tag(data, ASN1_CONTEXT_SIMPLE(ctx));
- asn1_write_DATA_BLOB_LDAPString(
- data, tree->u.substring.chunks[i]);
+ if (*s == ')') {
+ /* end of list, return */
asn1_pop_tag(data);
- i++;
+ break;
}
- asn1_pop_tag(data);
- asn1_pop_tag(data);
- break;
+ }
- case LDB_OP_GREATER:
- /* greaterOrEqual test */
- asn1_push_tag(data, ASN1_CONTEXT(5));
- asn1_write_OctetString(data, tree->u.comparison.attr,
- strlen(tree->u.comparison.attr));
- asn1_write_OctetString(data, tree->u.comparison.value.data,
- tree->u.comparison.value.length);
- asn1_pop_tag(data);
+done:
+ if (*s != ')') {
+ tldap_debug(ld, TLDAP_DEBUG_ERROR,
+ "Incomplete or malformed filter\n");
+ return false;
+ }
+ s++;
+
+ if (data->has_error) {
+ return false;
+ }
+
+ *_s = s;
+ return true;
+}
+
+
+static bool tldap_push_filter_basic(struct tldap_context *ld,
+ struct asn1_data *data,
+ const char **_s)
+{
+ TALLOC_CTX *tmpctx = talloc_tos();
+ const char *s = *_s;
+ const char *e;
+ const char *eq;
+ const char *val;
+ const char *type;
+ const char *dn;
+ const char *rule;
+ const char *star;
+ size_t type_len;
+ char *uval;
+ size_t uval_len;
+ bool write_octect = true;
+ bool ret;
+
+ eq = strchr(s, '=');
+ if (!eq) {
+ tldap_debug(ld, TLDAP_DEBUG_ERROR,
+ "Invalid filter, missing equal sign\n");
+ return false;
+ }
+
+ val = eq + 1;
+ e = eq - 1;
+
+ switch (*e) {
+ case '<':
+ asn1_push_tag(data, TLDAP_FILTER_LE);
break;
- case LDB_OP_LESS:
- /* lessOrEqual test */
- asn1_push_tag(data, ASN1_CONTEXT(6));
- asn1_write_OctetString(data, tree->u.comparison.attr,
- strlen(tree->u.comparison.attr));
- asn1_write_OctetString(data, tree->u.comparison.value.data,
- tree->u.comparison.value.length);
- asn1_pop_tag(data);
+ case '>':
+ asn1_push_tag(data, TLDAP_FILTER_GE);
break;
- case LDB_OP_PRESENT:
- /* present test */
- asn1_push_tag(data, ASN1_CONTEXT_SIMPLE(7));
- asn1_write_LDAPString(data, tree->u.present.attr);
- asn1_pop_tag(data);
- return !data->has_error;
-
- case LDB_OP_APPROX:
- /* approx test */
- asn1_push_tag(data, ASN1_CONTEXT(8));
- asn1_write_OctetString(data, tree->u.comparison.attr,
- strlen(tree->u.comparison.attr));
- asn1_write_OctetString(data, tree->u.comparison.value.data,
- tree->u.comparison.value.length);
- asn1_pop_tag(data);
+ case '~':
+ asn1_push_tag(data, TLDAP_FILTER_APX);
break;
- case LDB_OP_EXTENDED:
+ case ':':
+ asn1_push_tag(data, TLDAP_FILTER_EXT);
+ write_octect = false;
+
+ type = NULL;
+ dn = NULL;
+ rule = NULL;
+
+ if (*s == ':') { /* [:dn]:rule:= value */
+ if (s == e) {
+ /* malformed filter */
+ return false;
+ }
+ dn = s;
+ } else { /* type[:dn][:rule]:= value */
+ type = s;
+ dn = strchr(s, ':');
+ type_len = dn - type;
+ if (dn == e) { /* type:= value */
+ dn = NULL;
+ }
+ }
+ if (dn) {
+ dn++;
+
+ rule = strchr(dn, ':');
+ if ((rule == dn + 1) || rule + 1 == e) {
+ /* malformed filter, contains "::" */
+ return false;
+ }
+
+ if (StrnCaseCmp(dn, "dn:", 3) != 0) {
+ if (rule == e) {
+ rule = dn;
+ dn = NULL;
+ } else {
+ /* malformed filter. With two
+ * optionals, the first must be "dn"
+ */
+ return false;
+ }
+ } else {
+ if (rule == e) {
+ rule = NULL;
+ } else {
+ rule++;
+ }
+ }
+ }
+
+ if (!type && !dn && !rule) {
+ /* malformed filter, there must be at least one */
+ return false;
+ }
+
/*
MatchingRuleAssertion ::= SEQUENCE {
matchingRule [1] MatchingRuleID OPTIONAL,
- type [2] AttributeDescription OPTIONAL,
+ type [2] AttributeDescription OPTIONAL,
matchValue [3] AssertionValue,
dnAttributes [4] BOOLEAN DEFAULT FALSE
}
*/
- asn1_push_tag(data, ASN1_CONTEXT(9));
- if (tree->u.extended.rule_id) {
+
+ /* check and add rule */
+ if (rule) {
+ ret = tldap_is_attrdesc(rule, e - rule, true);
+ if (!ret) {
+ return false;
+ }
asn1_push_tag(data, ASN1_CONTEXT_SIMPLE(1));
- asn1_write_LDAPString(data, tree->u.extended.rule_id);
+ asn1_write(data, rule, e - rule);
asn1_pop_tag(data);
}
- if (tree->u.extended.attr) {
+
+ /* check and add type */
+ if (type) {
+ ret = tldap_is_attrdesc(type, type_len, false);
+ if (!ret) {
+ return false;
+ }
asn1_push_tag(data, ASN1_CONTEXT_SIMPLE(2));
- asn1_write_LDAPString(data, tree->u.extended.attr);
+ asn1_write(data, type, type_len);
asn1_pop_tag(data);
}
+
+ uval = tldap_get_val(tmpctx, val, _s);
+ if (!uval) {
+ return false;
+ }
+ uval_len = *_s - val;
+ ret = tldap_unescape_inplace(uval, &uval_len);
+ if (!ret) {
+ return false;
+ }
+
asn1_push_tag(data, ASN1_CONTEXT_SIMPLE(3));
- asn1_write_DATA_BLOB_LDAPString(data, &tree->u.extended.value);
+ asn1_write(data, uval, uval_len);
asn1_pop_tag(data);
+
asn1_push_tag(data, ASN1_CONTEXT_SIMPLE(4));
- asn1_write_uint8(data, tree->u.extended.dnAttributes);
- asn1_pop_tag(data);
+ asn1_write_uint8(data, dn?1:0);
asn1_pop_tag(data);
break;
default:
+ e = eq;
+
+ ret = tldap_is_attrdesc(s, e - s, false);
+ if (!ret) {
+ return false;
+ }
+
+ if (strncmp(val, "*)", 2) == 0) {
+ /* presence */
+ asn1_push_tag(data, TLDAP_FILTER_PRES);
+ asn1_write(data, s, e - s);
+ *_s = val + 1;
+ write_octect = false;
+ break;
+ }
+
+ ret = tldap_find_first_star(val, &star);
+ if (!ret) {
+ return false;
+ }
+ if (*star == '*') {
+ /* substring */
+ asn1_push_tag(data, TLDAP_FILTER_SUB);
+ asn1_write_OctetString(data, s, e - s);
+ ret = tldap_push_filter_substring(ld, data, val, &s);
+ if (!ret) {
+ return false;
+ }
+ *_s = s;
+ write_octect = false;
+ break;
+ }
+
+ /* if nothing else, then it is just equality */
+ asn1_push_tag(data, TLDAP_FILTER_EQ);
+ write_octect = true;
+ break;
+ }
+
+ if (write_octect) {
+ uval = tldap_get_val(tmpctx, val, _s);
+ if (!uval) {
+ return false;
+ }
+ uval_len = *_s - val;
+ ret = tldap_unescape_inplace(uval, &uval_len);
+ if (!ret) {
+ return false;
+ }
+
+ asn1_write_OctetString(data, s, e - s);
+ asn1_write_OctetString(data, uval, uval_len);
+ }
+
+ if (data->has_error) {
return false;
}
- return !data->has_error;
+ asn1_pop_tag(data);
+ return true;
+}
+
+static bool tldap_push_filter_substring(struct tldap_context *ld,
+ struct asn1_data *data,
+ const char *val,
+ const char **_s)
+{
+ TALLOC_CTX *tmpctx = talloc_tos();
+ bool initial = true;
+ const char *star;
+ char *chunk;
+ size_t chunk_len;
+ bool ret;
+
+ /*
+ SubstringFilter ::= SEQUENCE {
+ type AttributeDescription,
+ -- at least one must be present
+ substrings SEQUENCE OF CHOICE {
+ initial [0] LDAPString,
+ any [1] LDAPString,
+ final [2] LDAPString } }
+ */
+ asn1_push_tag(data, ASN1_SEQUENCE(0));
+
+ do {
+ ret = tldap_find_first_star(val, &star);
+ if (!ret) {
+ return false;
+ }
+ chunk_len = star - val;
+
+ switch (*star) {
+ case '*':
+ if (!initial && chunk_len == 0) {
+ /* found '**', which is illegal */
+ return false;
+ }
+ break;
+ case ')':
+ if (initial) {
+ /* no stars ?? */
+ return false;
+ }
+ /* we are done */
+ break;
+ default:
+ /* ?? */
+ return false;
+ }
+
+ if (initial && chunk_len == 0) {
+ val = star + 1;
+ initial = false;
+ continue;
+ }
+
+ chunk = talloc_strndup(tmpctx, val, chunk_len);
+ if (!chunk) {
+ return false;
+ }
+ ret = tldap_unescape_inplace(chunk, &chunk_len);
+ if (!ret) {
+ return false;
+ }
+ switch (*star) {
+ case '*':
+ if (initial) {
+ asn1_push_tag(data, TLDAP_SUB_INI);
+ initial = false;
+ } else {
+ asn1_push_tag(data, TLDAP_SUB_ANY);
+ }
+ break;
+ case ')':
+ asn1_push_tag(data, TLDAP_SUB_FIN);
+ break;
+ default:
+ /* ?? */
+ return false;
+ }
+ asn1_write(data, chunk, chunk_len);
+ asn1_pop_tag(data);
+
+ val = star + 1;
+
+ } while (*star == '*');
+
+ *_s = star;
+
+ /* end of sequence */
+ asn1_pop_tag(data);
+ return true;
}
-static bool tldap_push_filter(struct asn1_data *data, const char *filter)
+/* NOTE: although openldap libraries allow for spaces in some places, mosly
+ * around parenthesis, we do not allow any spaces (except in values of
+ * course) as I couldn't fine any place in RFC 4512 or RFC 4515 where
+ * leading or trailing spaces where allowed.
+ */
+static bool tldap_push_filter(struct tldap_context *ld,
+ struct asn1_data *data,
+ const char *filter)
{
- struct ldb_parse_tree *tree;
+ const char *s = filter;
bool ret;
- tree = ldb_parse_tree(talloc_tos(), filter);
- if (tree == NULL) {
+ ret = tldap_push_filter_int(ld, data, &s);
+ if (ret && *s) {
+ tldap_debug(ld, TLDAP_DEBUG_ERROR,
+ "Incomplete or malformed filter\n");
return false;
}
- ret = ldap_push_filter(data, tree);
- TALLOC_FREE(tree);
return ret;
}
@@ -1165,7 +1644,7 @@ struct tevent_req *tldap_search_send(TALLOC_CTX *mem_ctx,
asn1_write_Integer(state->out, timelimit);
asn1_write_BOOLEAN(state->out, attrsonly);
- if (!tldap_push_filter(state->out, filter)) {
+ if (!tldap_push_filter(ld, state->out, filter)) {
goto encoding_error;
}
@@ -1344,6 +1823,13 @@ int tldap_search(struct tldap_context *ld,
tevent_req_set_callback(req, tldap_search_cb, &state);
+ if (!tevent_req_is_in_progress(req)) {
+ /* an error happend before sending */
+ if (tevent_req_is_ldap_error(req, &state.rc)) {
+ goto fail;
+ }
+ }
+
while (tevent_req_is_in_progress(req)
&& (state.rc == TLDAP_SUCCESS)) {
if (tevent_loop_once(ev) == -1) {
generated by cgit (git 2.34.1) at 2024-11-24 04:48:34 +0000