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Diffstat (limited to 'plugin/auth_examples/qa_auth_client.c')
-rw-r--r-- | plugin/auth_examples/qa_auth_client.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/plugin/auth_examples/qa_auth_client.c b/plugin/auth_examples/qa_auth_client.c new file mode 100644 index 00000000..a915306e --- /dev/null +++ b/plugin/auth_examples/qa_auth_client.c @@ -0,0 +1,117 @@ +/* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved. + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; version 2 of the + License. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */ + +#include <my_global.h> +#include <mysql/plugin_auth.h> +#include <mysql/client_plugin.h> +#include <string.h> +#include <stdio.h> +#include <stdlib.h> + +/********************* CLIENT SIDE ***************************************/ +/* + client plugin used for testing the plugin API +*/ +#include <mysql.h> + +/** + The main function of the test plugin. + + Reads the prompt, check if the handshake is done and if the prompt is a + password request and returns the password. Otherwise return error. + + @note + 1. this plugin shows how a client authentication plugin + may read a MySQL protocol OK packet internally - which is important + where a number of packets is not known in advance. + 2. the first byte of the prompt is special. it is not + shown to the user, but signals whether it is the last question + (prompt[0] & 1 == 1) or not last (prompt[0] & 1 == 0), + and whether the input is a password (not echoed). + 3. the prompt is expected to be sent zero-terminated +*/ +static int test_plugin_client(MYSQL_PLUGIN_VIO *vio, MYSQL *mysql) +{ + unsigned char *pkt, cmd= 0; + int pkt_len, res; + char *reply; + + do + { + /* read the prompt */ + pkt_len= vio->read_packet(vio, &pkt); + if (pkt_len < 0) + return CR_ERROR; + + if (pkt == 0) + { + /* + in mysql_change_user() the client sends the first packet, so + the first vio->read_packet() does nothing (pkt == 0). + + We send the "password", assuming the client knows what its doing. + (in other words, the dialog plugin should be only set as a default + authentication plugin on the client if the first question + asks for a password - which will be sent in cleat text, by the way) + */ + reply= mysql->passwd; + } + else + { + cmd= *pkt++; + + /* is it MySQL protocol (0=OK or 254=need old password) packet ? */ + if (cmd == 0 || cmd == 254) + return CR_OK_HANDSHAKE_COMPLETE; /* yes. we're done */ + + /* + asking for a password with an empty prompt means mysql->password + otherwise return an error + */ + if ((cmd == LAST_PASSWORD[0] || cmd == PASSWORD_QUESTION[0]) && *pkt == 0) + reply= mysql->passwd; + else + return CR_ERROR; + } + if (!reply) + return CR_ERROR; + /* send the reply to the server */ + res= vio->write_packet(vio, (const unsigned char *) reply, + (int)strlen(reply) + 1); + + if (res) + return CR_ERROR; + + /* repeat unless it was the last question */ + } while (cmd != LAST_QUESTION[0] && cmd != PASSWORD_QUESTION[0]); + + /* the job of reading the ok/error packet is left to the server */ + return CR_OK; +} + + +mysql_declare_client_plugin(AUTHENTICATION) + "qa_auth_client", + "Horst Hunger", + "Dialog Client Authentication Plugin", + {0,1,0}, + "GPL", + NULL, + NULL, + NULL, + NULL, + test_plugin_client +mysql_end_client_plugin; |