[libmicrohttpd] 02/02: Fixed wrong usage of maximum client nonce size as maximum size of server nonce

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karlson2k pushed a commit to branch master
in repository libmicrohttpd.

commit abe138ee3aaadea496fbdddd23d79fbe40113171
Author: Evgeny Grin (Karlson2k) <k2k@narod.ru>
AuthorDate: Tue Jun 7 20:23:18 2022 +0300

    Fixed wrong usage of maximum client nonce size as maximum size of server 
nonce
    
    This also saves some RAM for nonce-nc map array
---
 src/microhttpd/digestauth.c |  8 ++++----
 src/microhttpd/internal.h   | 12 ++++++++++--
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/src/microhttpd/digestauth.c b/src/microhttpd/digestauth.c
index c3717d47..890fc129 100644
--- a/src/microhttpd/digestauth.c
+++ b/src/microhttpd/digestauth.c
@@ -751,7 +751,7 @@ check_nonce_nc (struct MHD_Connection *connection,
   mhd_assert (0 != noncelen);
   mhd_assert (strlen (nonce) == noncelen);
   mhd_assert (0 != nc);
-  if (MAX_NONCE_LENGTH < noncelen)
+  if (MAX_DIGEST_NONCE_LENGTH < noncelen)
     return MHD_CHECK_NONCENC_WRONG; /* This should be impossible, but static 
analysis
                       tools have a hard time with it *and* this also
                       protects against unsafe modifications that may
@@ -1010,7 +1010,7 @@ is_slot_available (const struct MHD_NonceNc *const nn,
   uint64_t timestamp;
   bool timestamp_valid;
   mhd_assert (new_nonce_len <= NONCE_STD_LEN (MAX_DIGEST));
-  mhd_assert (NONCE_STD_LEN (MAX_DIGEST) < MAX_NONCE_LENGTH);
+  mhd_assert (NONCE_STD_LEN (MAX_DIGEST) <= MAX_DIGEST_NONCE_LENGTH);
   if (0 == nn->nonce[0])
     return true; /* The slot is empty */
 
@@ -1071,7 +1071,7 @@ calculate_add_nonce (struct MHD_Connection *const 
connection,
   const size_t nonce_size = NONCE_STD_LEN (digest_get_size (da));
   bool ret;
 
-  mhd_assert (MAX_NONCE_LENGTH >= nonce_size);
+  mhd_assert (MAX_DIGEST_NONCE_LENGTH >= nonce_size);
   mhd_assert (0 != nonce_size);
 
   calculate_nonce (timestamp,
@@ -1427,7 +1427,7 @@ digest_auth_check_all (struct MHD_Connection *connection,
                        unsigned int nonce_timeout)
 {
   struct MHD_Daemon *daemon = MHD_get_master (connection->daemon);
-  char cnonce[MAX_NONCE_LENGTH];
+  char cnonce[MAX_CLIENT_NONCE_LENGTH];
   const unsigned int digest_size = digest_get_size (da);
   char ha1[VLA_ARRAY_LEN_DIGEST (digest_size) * 2 + 1];
   char qop[15]; /* auth,auth-int */
diff --git a/src/microhttpd/internal.h b/src/microhttpd/internal.h
index 4f03b8fc..92fa932b 100644
--- a/src/microhttpd/internal.h
+++ b/src/microhttpd/internal.h
@@ -240,8 +240,16 @@ enum MHD_ConnectionEventLoopInfo
  * (already) takes more (see Mantis #1633), so we've increased the
  * value to support something longer...
  */
-#define MAX_NONCE_LENGTH 129
+#define MAX_CLIENT_NONCE_LENGTH 129
 
+/**
+ * The maximum size of MHD-generated nonce when printed with hexadecimal chars.
+ *
+ * This is equal to "(32 bytes for SHA-256 nonce plus 6 bytes for timestamp)
+ * multiplied by two hex chars per byte".
+ * Please keep it in sync with digestauth.c
+ */
+#define MAX_DIGEST_NONCE_LENGTH ((32 + 6) * 2)
 
 /**
  * A structure representing the internal holder of the
@@ -269,7 +277,7 @@ struct MHD_NonceNc
   /**
    * Nonce value:
    */
-  char nonce[MAX_NONCE_LENGTH + 1];
+  char nonce[MAX_DIGEST_NONCE_LENGTH + 1];
 
 };
 

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