kerneltime commented on PR #3531:
URL: https://github.com/apache/ozone/pull/3531#issuecomment-1181366640

   > > There is one complication when adding a separate auth failure audit log. 
S3 gateway only validates if the auth signature is well-formed. The actual 
check for credentials occurs at OM. We would need to peek into the exception to 
know if this is related to auth or a different issue if we want to log it as an 
AUTH exception entry in the audit log.
   > 
   > Thanks for the clarification. I introduced the new AUTH marker just 
because at the time of validating signature, we don't know if the operation is 
either `READ` or `WRITE` yet. These action/classification is determined 
manually on-by-one at the endpoint handlers, 
[e.g.](https://github.com/duongnguyen0/ozone/blob/fcf8aae1fc510e399ffde7013d6649712bc06424/hadoop-ozone/s3gateway/src/main/java/org/apache/hadoop/ozone/s3/endpoint/BucketEndpoint.java#L250-L250).
   > 
   > Yet, as you mentioned, if we're to do that, need to do that consistently 
for the actual credentials check as well.
   > 
   > If we don't do that, we can probably infer READ/WRITE base on the web 
context (e.g. if method is GET/HEAD then READ). However, this is also prone for 
inconsistence.
   > 
   > Also, the logged action is another complication is the logged action, 
which is also [manually put at the endpoint 
handler](https://github.com/duongnguyen0/ozone/blob/fcf8aae1fc510e399ffde7013d6649712bc06424/hadoop-ozone/s3gateway/src/main/java/org/apache/hadoop/ozone/s3/endpoint/BucketEndpoint.java#L246-L246).
 So, if the adit log is issued at in the handler, it appears as
   > 
   > ```
   > INFO | S3GAudit | op=CREATE_BUCKET  {bucket=myBucket} | Some failure 
inside the handler
   > ```
   > 
   > But at the time of validating signature, the best we can do is:
   > 
   > ```
   > INFO | S3GAudit | op=PUT /bucket/myBucket  {bucket=myBucket} | Error 
parsing signature...
   > ```
   > 
   > I guess it depends on how consistent we want to introduce in the AUDIT 
log. Another refactor would be needed to make audit logging a consistent 
mechanism in S3G.
   
   I agree, I think it would be best to not expand the current PR to fix all 
the issue but to do incrementally and keep the parent Jira open and add tasks 
as identified.  For now, the scope of the changes here look good and it is more 
important to get the customer initiated logging off the S3G logs first.


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