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Upgrade SSLContext Minimum Version


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HighMerge Without ReviewNo

This codemod replaces all unsafe and/or deprecated SSL/TLS versions when used to set the ssl.SSLContext.minimum_version attribute. It uses ssl.TLSVersion.TLSv1_2 instead, which ensures a safe default minimum TLS version.

Our change involves modifying the minimum_version attribute of ssl.SSLContext instances to use ssl.TLSVersion.TLSv1_2.

  import ssl
context = ssl.SSLContext(protocol=PROTOCOL_TLS_CLIENT)
- context.minimum_version = ssl.TLSVersion.SSLv3
+ context.minimum_version = ssl.TLSVersion.TLSv1_2

There is no functional difference between the unsafe and safe versions, and all modern servers offer TLSv1.2.

If you have feedback on this codemod, please let us know!


Why is this codemod marked as Merge Without Review?

This codemod updates the minimum supported version of TLS. Since this is an important security fix and since all modern servers offer TLSv1.2, we believe this change can be safely merged without review.

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