ldap_password_func.c

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/*-------------------------------------------------------------------------
 *
 * Copyright (c) 2022, PostgreSQL Global Development Group
 *
 * ldap_password_func.c
 *
 * Loadable PostgreSQL module to mutate the ldapbindpasswd. This
 * implementation just hands back the configured password rot13'd.
 *
 *-------------------------------------------------------------------------
 */
 
#include "postgres.h"
 
#include <float.h>
#include <stdio.h>
 
#include "libpq/libpq.h"
#include "libpq/libpq-be.h"
#include "libpq/auth.h"
#include "utils/guc.h"
 
PG_MODULE_MAGIC;
 
void        _PG_init(void);
void        _PG_fini(void);
 
/* hook function */
static char *rot13_passphrase(char *password);
 
/*
 * Module load callback
 */
void
_PG_init(void)
{
    ldap_password_hook = rot13_passphrase;
}
 
void
_PG_fini(void)
{
    /* do  nothing yet */
}
 
static char *
rot13_passphrase(char *pw)
{
    size_t      size = strlen(pw) + 1;
 
    char       *new_pw = (char *) palloc(size);
 
    strlcpy(new_pw, pw, size);
    for (char *p = new_pw; *p; p++)
    {
        char        c = *p;
 
        if ((c >= 'a' && c <= 'm') || (c >= 'A' && c <= 'M'))
            *p = c + 13;
        else if ((c >= 'n' && c <= 'z') || (c >= 'N' && c <= 'Z'))
            *p = c - 13;
    }
 
    return new_pw;
}