Sentencing Reform and Corrections Act of 2017 This bill amends various provisions of law and sets forth new provisions: to reduce mandatory minimum prison terms for certain nonviolent repeat drug offenses; to establish a mandatory sentencing enhancement for a drug offense involving heroin or fentanyl; to broaden the existing safety valve to permit a sentence below the mandatory minimum for certain nonviolent, cooperative drug offenders with a limited criminal history; to create a new safety valve for certain nonviolent, cooperative defendants convicted of a high-level first-time or low-level repeat drug offense; to create new mandatory minimum prison terms, including for interstate domestic violence that results in a victim's death and for providing goods or services to terrorists; to make the Fair Sentencing Act of 2010 retroactive to permit resentencing of a convicted crack cocaine offender sentenced before August 3, 2010; to require the Bureau of Prisons to expand recidivism reduction programs and productive activities to all eligible prisoners; to lengthen prerelease custody for prisoners who successfully complete such programs; to develop the Post-Sentencing Risk and Needs Assessment System; to create reentry demonstration projects in judicial districts; to require presentence investigation reports to include certain information such as substance abuse history, military service, and veteran status; to permit a court to reduce a life prison term imposed on a defendant convicted as an adult for an offense committed as a juvenile; to establish a process to seal and expunge certain records of juvenile nonviolent offenses; to prohibit juvenile solitary confinement, except in limited circumstances; to make permanent and modify eligibility for an elderly offender early release pilot program; and to establish the National Criminal Justice Commission.