From 7f5ac2097be424a55248e391c6b40635d01b1fa6 Mon Sep 17 00:00:00 2001
From: Pierre Rogier <progier@redhat.com>
Date: Wed, 17 Apr 2024 18:18:04 +0200
Subject: [PATCH] CVE-2024-3657-7.9
---
ldap/servers/slapd/back-ldbm/index.c | 111 ++++++++++++++-------------
1 file changed, 59 insertions(+), 52 deletions(-)
diff --git a/ldap/servers/slapd/back-ldbm/index.c b/ldap/servers/slapd/back-ldbm/index.c
index f0b969ff4..53a041ad1 100644
--- a/ldap/servers/slapd/back-ldbm/index.c
+++ b/ldap/servers/slapd/back-ldbm/index.c
@@ -71,6 +71,32 @@ typedef struct _index_buffer_handle index_buffer_handle;
#define INDEX_BUFFER_FLAG_SERIALIZE 1
#define INDEX_BUFFER_FLAG_STATS 2
+/*
+ * space needed to encode a byte:
+ * 0x00-0x31 and 0x7f-0xff requires 3 bytes: \xx
+ * 0x22 and 0x5C requires 2 bytes: \" and \\
+ * other requires 1 byte: c
+ */
+static char encode_size[] = {
+ /* 0x00 */ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+ /* 0x10 */ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+ /* 0x20 */ 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ /* 0x30 */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ /* 0x40 */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ /* 0x50 */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1,
+ /* 0x60 */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ /* 0x70 */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3,
+ /* 0x80 */ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+ /* 0x90 */ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+ /* 0xA0 */ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+ /* 0xB0 */ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+ /* 0xC0 */ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+ /* 0xD0 */ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+ /* 0xE0 */ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+ /* 0xF0 */ 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+};
+
+
/* Index buffering functions */
static int
@@ -800,65 +826,46 @@ index_add_mods(
/*
* Convert a 'struct berval' into a displayable ASCII string
+ * returns the printable string
*/
-
-#define SPECIAL(c) (c < 32 || c > 126 || c == '\\' || c == '"')
-
const char *
encode(const struct berval *data, char buf[BUFSIZ])
{
- char *s;
- char *last;
- if (data == NULL || data->bv_len == 0)
- return "";
- last = data->bv_val + data->bv_len - 1;
- for (s = data->bv_val; s < last; ++s) {
- if (SPECIAL(*s)) {
- char *first = data->bv_val;
- char *bufNext = buf;
- size_t bufSpace = BUFSIZ - 4;
- while (1) {
- /* printf ("%lu bytes ASCII\n", (unsigned long)(s - first)); */
- if (bufSpace < (size_t)(s - first))
- s = first + bufSpace - 1;
- if (s != first) {
- memcpy(bufNext, first, s - first);
- bufNext += (s - first);
- bufSpace -= (s - first);
- }
- do {
- if (bufSpace) {
- *bufNext++ = '\\';
- --bufSpace;
- }
- if (bufSpace < 2) {
- memcpy(bufNext, "..", 2);
- bufNext += 2;
- goto bail;
- }
- if (*s == '\\' || *s == '"') {
- *bufNext++ = *s;
- --bufSpace;
- } else {
- sprintf(bufNext, "%02x", (unsigned)*(unsigned char *)s);
- bufNext += 2;
- bufSpace -= 2;
- }
- } while (++s <= last && SPECIAL(*s));
- if (s > last)
- break;
- first = s;
- while (!SPECIAL(*s) && s <= last)
- ++s;
- }
- bail:
- *bufNext = '\0';
- /* printf ("%lu chars in buffer\n", (unsigned long)(bufNext - buf)); */
+ if (!data || !data->bv_val) {
+ strcpy(buf, "<NULL>");
+ return buf;
+ }
+ char *endbuff = &buf[BUFSIZ-4]; /* Reserve space to append "...\0" */
+ char *ptout = buf;
+ unsigned char *ptin = (unsigned char*) data->bv_val;
+ unsigned char *endptin = ptin+data->bv_len;
+
+ while (ptin < endptin) {
+ if (ptout >= endbuff) {
+ /*
+ * BUFSIZ(8K) > SLAPI_LOG_BUFSIZ(2K) so the error log message will be
+ * truncated anyway. So there is no real interrest to test if the original
+ * data contains no special characters and return it as is.
+ */
+ strcpy(endbuff, "...");
return buf;
}
+ switch (encode_size[*ptin]) {
+ case 1:
+ *ptout++ = *ptin++;
+ break;
+ case 2:
+ *ptout++ = '\\';
+ *ptout++ = *ptin++;
+ break;
+ case 3:
+ sprintf(ptout, "\\%02x", *ptin++);
+ ptout += 3;
+ break;
+ }
}
- /* printf ("%lu bytes, all ASCII\n", (unsigned long)(s - data->bv_val)); */
- return data->bv_val;
+ *ptout = 0;
+ return buf;
}
static const char *
--
2.41.0