PKP/Bug Fixes/SPF

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Introduction

To combat spam and email phishing a new email system called the "Sender Policy Framework" (SPF) is being adopted world wide by academic institutions and others. This is a very recent development and therefore OJS systems must be retroactively configured to support SPF. This wiki page documents these efforts at Stellenbosch University Library.

What is the SPF?

https://en.wikipedia.org/wiki/Sender_Policy_Framework

From Wikipedia (retrieved 2016/05/17);

"Sender Policy Framework (SPF) is a simple email-validation system designed to detect email spoofing by providing a mechanism to allow receiving mail exchangers to check that incoming mail from a domain comes from a host authorized by that domain's administrators.[1] The list of authorized sending hosts for a domain is published in the Domain Name System (DNS) records for that domain in the form of a specially formatted TXT record. Email spam and phishing often use forged "from" addresses, so publishing and checking SPF records can be considered anti-spam techniques."

How does the SPF work?

To determine if there is an SPF record for a sending domain, use the "dig" command as per example below in a terminal; 

dig txt sun.ac.za

See:http://stackoverflow.com/questions/4082935/using-dig-to-search-for-spf-records

As can be seen from the sample records below the implementation per institution differs, but the point is that each domain is now SPF enabled and therefore OJS must adapt.

Sample output for "sun.ac.za" 


; <<>> DiG 9.10.3-P4-Ubuntu <<>> txt sun.ac.za
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 50092
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4000
;; QUESTION SECTION:
;sun.ac.za.			IN	TXT

;; ANSWER SECTION:
sun.ac.za.		25238	IN	TXT	"University of Stellenbosch, South Africa"
sun.ac.za.		25238	IN	TXT	"ydW1uk2ljPYuIuijeNP29VqLY1fH/1BYzJ8XkvuCmpe7b1pltGc4EaZcvw7V1PTKi5JkCgzH95fQNDdjOALHwQ=="
sun.ac.za.		25238	IN	TXT	"v=spf1 ip4:146.232.64.12 ip4:146.232.64.13 ip4:146.232.64.14 include:spf.protection.outlook.com -all"
sun.ac.za.		25238	IN	TXT	"Google Domain Verification 07082014"

;; Query time: 0 msec
;; SERVER: 127.0.1.1#53(127.0.1.1)
;; WHEN: Tue May 17 11:44:35 SAST 2016
;; MSG SIZE  rcvd: 353

Sample output for "uct.ac.za" 


; <<>> DiG 9.10.3-P4-Ubuntu <<>> txt uct.ac.za
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 62084
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4000
;; QUESTION SECTION:
;uct.ac.za.			IN	TXT

;; ANSWER SECTION:
uct.ac.za.		3600	IN	TXT	"Ox1qfakkMKmET7grQG8BzAU0BFKkXZlwIZLm68SBnlYXFefU2YK8lhbZCzevz88UNYx5QNheElQe6z5u/uApjQ=="
uct.ac.za.		3600	IN	TXT	"v=spf1 ip4:137.158.153.103 ip4:137.158.153.104 ip4:137.158.154.116 ip4:137.158.154.166 ip4:137.158.154.117 ip4:137.158.154.165 a include:_netblocks.mimecast.com include:spf.protection.outlook.com ~all"
uct.ac.za.		3600	IN	TXT	"MS=ms97433074"

;; Query time: 11 msec
;; SERVER: 127.0.1.1#53(127.0.1.1)
;; WHEN: Tue May 17 11:48:43 SAST 2016
;; MSG SIZE  rcvd: 378

Sample output for "up.ac.za" 


; <<>> DiG 9.10.3-P4-Ubuntu <<>> txt up.ac.za
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 51005
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4000
;; QUESTION SECTION:
;up.ac.za.			IN	TXT

;; ANSWER SECTION:
up.ac.za.		3600	IN	TXT	"google-site-verification=uZeP8pM4K0sBZNWCE4gAo8-gK4_WzH-nFuMRUlk4408"
up.ac.za.		3600	IN	TXT	"MS=ms60833582"
up.ac.za.		3600	IN	TXT	"v=spf1 ip4:137.215.0.0/16 mx ?all"

;; Query time: 22 msec
;; SERVER: 127.0.1.1#53(127.0.1.1)
;; WHEN: Tue May 17 11:50:04 SAST 2016
;; MSG SIZE  rcvd: 190

Normal Federated System

Step 1

To enable SPF for your federated domain you must FIRST add an "MX" record to your domain, so that the internet DNS servers know that your domain can receive email.

Step 2

For system mail to be managed, a no-reply system account needs to be created per federated system.

For example, for the "journals.ac.za" domain a "no-reply" email alias is created to deliver the "no-reply" email to the OJS system administrator, if needed.

See sample /etc/aliases file below; 

# See man 5 aliases for format
postmaster:    root
no-reply:      hgibson@sun.ac.za

See sample OJS config below; 

; Allow envelope sender to be specified
; (may not be possible with some server configurations)
allow_envelope_sender = On 

; Default envelope sender to use if none is specified elsewhere
default_envelope_sender = no-reply@journals.ac.za

; Force the default envelope sender (if present)
; This is useful if setting up a site-wide noreply address
; The reply-to field will be set with the reply-to or from address.
force_default_envelope_sender = On 

; Enable attachments in the various "Send Email" pages.
; (Disabling here will not disable attachments on features that
; require them, e.g. attachment-based reviews)
enable_attachments = On

Step 3

For each journal created, a local account must be created, so that email can be sent by the OJS system using this local account.

To add an account, follow the instructions below in a terminal; 

adduser xxxx

Where xxxx is the acronym or abbreviation of the journal hosted... this is the "path" refered to in the OJS documentation.

So for the journal: http://www.journals.ac.za/index.php/sajev we type the following; 

adduser sajev

Single Instance System

References

Retrieved from "http://wiki.lib.sun.ac.za/index.php?title=PKP/Bug_Fixes/SPF&oldid=42272"