prosody-modules: mod_auth_pam/mod_auth

mod_auth_pam: Initial commit of simple PAM authentication module

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-:b6280e8886f4
+:b8762c9fb270
+-- PAM authentication for Prosody
+-- Copyright (C) 2013 Kim Alvefur
+--
+-- Requires https://github.com/devurandom/lua-pam
+-- and LuaPosix
+local posix = require "posix";
+local pam = require "pam";
+local new_sasl = require "util.sasl".new;
+function user_exists(username)
+	return not not posix.getpasswd(username);
+end
+function test_password(username, password)
+	local h, err = pam.start("xmpp", username, {
+		function (t)
+			if #t == 1 and t[1][1] == pam.PAM_PROMPT_ECHO_OFF then
+				return { { password, 0} };
+			end
+		end
+	});
+	if h and h:authenticate() and h:endx(pam.PAM_SUCCESS) then
+		return true, true;
+	end
+	return nil, true;
+end
+function get_sasl_handler()
+	return new_sasl(module.host, {
+		plain_test = function(sasl, ...)
+			return test_password(...)
+		end
+	});
+end
+module:provides"auth";

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