Exhibit 5

ALLSTATE LIFE INSURANCE COMPANY

LAW AND REGULATION DEPARTMENT

2775 Sanders Road, Suite A2E

Northbrook, Illinois 60062

Direct Dial Number (847) 402-9365

Angela K. Fontana

Director, Vice President,

General Counsel and Secretary

November 3, 2017

TO:	ALLSTATE LIFE INSURANCE COMPANY NORTHBROOK, ILLINOIS 60062
FROM:	ANGELA K. FONTANA DIRECTOR, VICE PRESIDENT, GENERAL COUNSEL AND SECRETARY
RE:	FORM S-3 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 FILE NO. 333-220836

With reference to the Registration Statement on Form S-3 filed by Allstate Life Insurance Company (the “Company”) with the Securities and Exchange Commission covering the Flexible Premium Deferred Variable Annuity Contracts, known as STI Classic (the “Contracts”), I have examined such documents and such law as I have considered necessary and appropriate, and on the basis of such examination, it is my opinion that:

1. The Company is duly organized and existing under the laws of the State of Illinois and has been duly authorized to do business by the Director of Insurance of the State of Illinois.

2. The securities registered by the above Registration Statement when issued will be valid, legal and binding obligations of the Company.

I hereby consent to the filing of this opinion as an exhibit to the above referenced Registration Statement.

Sincerely,

/s/ Angela K. Fontana

Director, Vice President,

General Counsel and Secretary