rgw: calc md5 and compare if user provided appropriate header

Fixes: #8436
Backport: firefly

This was broken in ddc2e1a8e39a5c6b9b224c3eebd1c0e762ca5782. The fix
resurrects and old check that was dropped.

Signed-off-by: Yehuda Sadeh <yehuda@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
(cherry picked from commit 9c56c86bdac6bcb8e76c3f04e7d393e4eaadd721)

diff --git a/src/rgw/rgw_op.cc b/src/rgw/rgw_op.cc
index 990a14d571cb47593f0f04846999df34c4405934..53a72ef37b7d7b1aedb5529c6d312df3a930a6b0 100644 (file)
--- a/src/rgw/rgw_op.cc
+++ b/src/rgw/rgw_op.cc
@@ -1571,6 +1571,8 @@ void RGWPutObj::execute()
     goto done;
 
   if (supplied_md5_b64) {
+    need_calc_md5 = true;
+
     ldout(s->cct, 15) << "supplied_md5_b64=" << supplied_md5_b64 << dendl;
     ret = ceph_unarmor(supplied_md5_bin, &supplied_md5_bin[CEPH_CRYPTO_MD5_DIGESTSIZE + 1],
                        supplied_md5_b64, supplied_md5_b64 + strlen(supplied_md5_b64));
@@ -1650,6 +1652,11 @@ void RGWPutObj::execute()
 
     buf_to_hex(m, CEPH_CRYPTO_MD5_DIGESTSIZE, calc_md5);
     etag = calc_md5;
+
+    if (supplied_md5_b64 && strcmp(calc_md5, supplied_md5)) {
+      ret = -ERR_BAD_DIGEST;
+      goto done;
+    }
   }
 
   policy.encode(aclbl);