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The Lounge What is on Your Mind? Denial Of Service Attack Update Post 303036021 by Neo on Wednesday 12th of June 2019 04:48:43 PM
Old 06-12-2019
Denial Of Service Attack Update

Dear All,

We were hit with a denial of service (DOS) attack today beginning around June 12th 2019 @ 01:27:51 PM from an IP address registered to "RACKWEB-NET" in Bulgaria.

I was notified about this around June 12th 2019 @ 03:05 PM and did some log file analysis and discovered how the attack was happening and wrote some code to mitigate against the attack.

I think the site was down for about 1 hour and 19 minutes because of the attack.

The code I wrote will filter against these kinds of DOS attacks in the future.

Thank you for your support,

Neo

EDIT: In addition to the PHP changes, I made some changes to the DB configuration as well to help insure this kind of attack cannot succeed in the future.
These 9 Users Gave Thanks to Neo For This Post:
 
sasl_client_new(21 June 2001)											     sasl_client_new(21 June 2001)

NAME
sasl_client_new - Create a new client authentication object SYNOPSIS
#include <sasl/sasl.h> int sasl_client_new(const char *service, const char *serverFQDN, const char *iplocalport, const char *ipremoteport, const sasl_callback_t *prompt_supp, unsigned secflags, sasl_conn_t ** pconn); DESCRIPTION
sasl_client_new() creates a new SASL context. This context will be used for all SASL calls for one connection. It handles both authentica- tion and integrity/encyption layers after authentication. service is the registered name of the service (usually the protocol name) using SASL (e.g. "imap"). serverFQDN is the fully qualified domain name of the server (e.g. "serverhost.cmu.edu"). iplocalport is the IP and port of the local side of the connection, or NULL. If iplocalport is NULL it will disable mechanisms that require IP address information. This strings must be in one of the following formats: "a.b.c.d;port" (IPv4), "e:f:g:h:i:j:k:l;port" (IPv6), or "e:f:g:h:i:j:a.b.c.d;port" (IPv6) ipremoteport is the IP and port of the remote side of the connection, or NULL (see iplocalport) prompt_supp is a list of client interactions supported that is unique to this connection. If this parameter is NULL the global callbacks (specified in sasl_client_init) will be used. See sasl_callback for more information. secflags are security flags (see below) pconn is the conection context allocated by the library. This structure will be used for all future SASL calls for this connection. Security Flags Security flags that may be passed to sasl_server_new() include SASL_SEC_NOPLAINTEXT Don't permit mechanisms susceptible to simple passive attack (e.g., PLAIN, LOGIN) SASL_SEC_NOACTIVE Protection from active (non-dictionary) attacks during authentication exchange. Authenticates server. SASL_SEC_NODICTIONARY Don't permit mechanisms susceptible to passive dictionary attack SASL_SEC_FORWARD_SECURITY Require forward secrecy between sessions. (breaking one won't help break next) SASL_SEC_NOANONYMOUS Don't permit mechanisms that allow anonymous login SASL_SEC_PASS_CREDENTIALS Require mechanisms which pass client credentials, and allow mechanisms which can pass credentials to do so. SASL_SEC_MAXIMUM All of the above. RETURN VALUE
sasl_client_new returns an integer which corresponds to one of the following codes. SASL_OK is the only one that indicates success. All others indicate errors and should either be handled or the authentication session should be quit. ERRORS
SASL_OK Success SASL_BADPARAM Error in config file or passed parameters SASL_NOMECH No mechanism meets requested properties SASL_NOMEM Not enough memory to complete operation CONFORMING TO
RFC 2222 SEE ALSO
sasl(3), sasl_client_init(3), sasl_client_start(3), sasl_client_step(3), sasl_setprop(3) SASL man pages SASL sasl_client_new(21 June 2001)
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