Encontrei este trecho neste tópico intitulado: Vincule a portas com menos de 1024 sem acesso root .
trecho
I dimly remember a library called "authbind" that does what you need, by wrapping the
bind()
system call (via aLD_PRELOAD
library), and, if a privileged port is requested, spawning a setuid root program that receives a copy of the file descriptor, then verifies the application is indeed permitted to bind to the port, performs thebind()
and exits.