According to the Art 76, Attorney General is the highest law officer in the country

Appointment:

Appointed by the President during his pleasure

Qualifications:

As to that of a judge of SC
(including an eminent jurist in the opinion of the President)

Duties and functions:

• To advise GoI on legal matters and to appear for the GoI in SC and High Courts
• To discharge other legal duties assigned by the President

Rights:

• He has the right to audience in any court
• He has the right to speak and take part in the proceedings of both the houses (With no voting rights)
• He enjoys all the privileges and immunities available to an MP
• He is not a full time counsel for the Govt and does not fall under the category of govt servant.
• He is not debarred from private legal practice.
• However, in case of defending accused in criminal prosecution, he is not allowed without prior permission.  

Solicitor General(s) of India:
To assist Attorney General, but there is no mention of them in the Constitution.