BUG/MINOR: spoe: add missing key length check before checking key names

The spoe parser fails to check that the decoded key length is large
enough to match a given key but it uses the returned length in memcmp().
So returning "ver" could match "version" for example. In addition this
makes clang 10's ASAN complain because the second argument to memcmp()
is the static key which is shorter than the decoded buffer size, which
in practice has no impact.

I'm still not 100% sure the parser is entirely correct because even
with this fix it cannot parse a key whose name matches the beginning
of another one, but in practice this does not happen. Ideally a
preliminary length check before the comparison would be safer.

This needs to be backported as far as 1.7.

diff --git a/src/flt_spoe.c b/src/flt_spoe.c
index 6302fc83e05ad9b08136c1d16ae5d64eb0368437..49d7466ae7d8088268b12bb647a12a93eb8bddca 100644 (file)
--- a/src/flt_spoe.c
+++ b/src/flt_spoe.c
@@ -682,7 +682,7 @@ spoe_handle_agenthello_frame(struct appctx *appctx, char *frame, size_t size)
                }
 
                /* Check "version" K/V item */
-               if (!memcmp(str, VERSION_KEY, sz)) {
+               if (sz >= strlen(VERSION_KEY) && !memcmp(str, VERSION_KEY, strlen(VERSION_KEY))) {
                        int i, type = *p++;
 
                        /* The value must be a string */
@@ -711,7 +711,7 @@ spoe_handle_agenthello_frame(struct appctx *appctx, char *frame, size_t size)
                        }
                }
                /* Check "max-frame-size" K/V item */
-               else if (!memcmp(str, MAX_FRAME_SIZE_KEY, sz)) {
+               else if (sz >= strlen(MAX_FRAME_SIZE_KEY) && !memcmp(str, MAX_FRAME_SIZE_KEY, strlen(MAX_FRAME_SIZE_KEY))) {
                        int type = *p++;
 
                        /* The value must be integer */
@@ -734,7 +734,7 @@ spoe_handle_agenthello_frame(struct appctx *appctx, char *frame, size_t size)
                        max_frame_size = sz;
                }
                /* Check "capabilities" K/V item */
-               else if (!memcmp(str, CAPABILITIES_KEY, sz)) {
+               else if (sz >= strlen(CAPABILITIES_KEY) && !memcmp(str, CAPABILITIES_KEY, strlen(CAPABILITIES_KEY))) {
                        int type = *p++;
 
                        /* The value must be a string */
@@ -868,7 +868,7 @@ spoe_handle_agentdiscon_frame(struct appctx *appctx, char *frame, size_t size)
                }
 
                /* Check "status-code" K/V item */
-               if (!memcmp(str, STATUS_CODE_KEY, sz)) {
+               if (sz >= strlen(STATUS_CODE_KEY) && !memcmp(str, STATUS_CODE_KEY, strlen(STATUS_CODE_KEY))) {
                        int type = *p++;
 
                        /* The value must be an integer */
@@ -887,7 +887,7 @@ spoe_handle_agentdiscon_frame(struct appctx *appctx, char *frame, size_t size)
                }
 
                /* Check "message" K/V item */
-               else if (!memcmp(str, MSG_KEY, sz)) {
+               else if (sz >= strlen(MSG_KEY) && !memcmp(str, MSG_KEY, strlen(MSG_KEY))) {
                        int type = *p++;
 
                        /* The value must be a string */