Skip trailing newlines in pin-source files #610
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Text editors usually append '\n' to the last line when saving a text file. Also 'echo "mypin" > ~/pinfile.txt' appends a newline. It's therefore likely we encounter PIN files where the PIN is delimited with '\n'. Currently, PIN validation would fail in such a case since libp11 passes on the newline to PKCS#11 modules as if it was part of the PIN. We now ignore trailing newlines. There's no specification mandating this, but since PINs are meant for interactive input it seems safe to assume PINs will never be allowed to contain a trailing newline. Further, the pkcs11-provider project is doing the same in their src/util.c:get_pin_file. The change is backwards compatible. PIN files without trailing newline will work as well.
mtrojnar
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Jul 16, 2025
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Text editors usually append
'\n'to the last line when saving a text file. Alsoecho "mypin" > ~/pinfile.txtappends a newline. It's therefore likely we encounter PIN files where the PIN is delimited with'\n'. Currently, PIN validation would fail in such a case since libp11 passes on the newline to PKCS#11 modules as if it was part of the PIN.We now ignore trailing newlines. There's no specification mandating this, but since PINs are meant for interactive input it seems safe to assume PINs will never be allowed to contain a trailing newline. Further, the pkcs11-provider project is doing the same in their src/util.c:get_pin_file.
The change is backwards compatible. PIN files without trailing newline will work as well.