Auth0 Token Vault handles secure token storage, exchange, and refresh for external providers so you don't have to build it yourself.
Rolling your own OAuth token storage can be a security liability. Token Vault securely stores access and refresh tokens from federated providers and handles exchange and renewal automatically. Connected accounts, refresh exchange, and privileged worker flows included.
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/usr/bin/passwd offers a "safe way" for root to edit /etc/passwd (or shadow). If setuid it allows regular users to change passwd without asking root to do changes for them.
(note: does have learning curve on args to choose)
gnupasswd - gnu change user password
gnugpasswd - gnu change group password
gnupasswd(1) has a goal to work with older login.c/linux and some newer too, also "getpwent" (any glibc). or help convert.
gnupassd does pass only: leaves all else alone (compat). ...