src/lib-sasl/mech-login.c

/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */

#include "lib.h"
#include "str.h"
#include "dsasl-client-private.h"

enum login_state {
    STATE_INIT = 0,
    STATE_USER,
    STATE_PASS
};

struct login_dsasl_client {
    struct dsasl_client client;
    enum login_state state;
};

static int
mech_login_input(struct dsasl_client *_client,
         const unsigned char *input ATTR_UNUSED,
         size_t input_len ATTR_UNUSED,
         const char **error_r)
{
    struct login_dsasl_client *client =
        (struct login_dsasl_client *)_client;

    if (client->state == STATE_PASS) {
        *error_r = "Server didn't finish authentication";
        return -1;
    }
    client->state++;
    return 0;
}

static int
mech_login_output(struct dsasl_client *_client,
          const unsigned char **output_r, size_t *output_len_r,
          const char **error_r)
{
    struct login_dsasl_client *client =
        (struct login_dsasl_client *)_client;

    if (_client->set.authid == NULL) {
        *error_r = "authid not set";
        return -1;
    }
    if (_client->password == NULL) {
        *error_r = "password not set";
        return -1;
    }

    switch (client->state) {
    case STATE_INIT:
        *output_r = uchar_empty_ptr;
        *output_len_r = 0;
        return 0;
    case STATE_USER:
        *output_r = (const unsigned char *)_client->set.authid;
        *output_len_r = strlen(_client->set.authid);
        return 0;
    case STATE_PASS:
        *output_r = (const unsigned char *)_client->set.password;
        *output_len_r = strlen(_client->set.password);
        return 0;
    }
    i_unreached();
}

const struct dsasl_client_mech dsasl_client_mech_login = {
    .name = "LOGIN",
    .struct_size = sizeof(struct login_dsasl_client),

    .input = mech_login_input,
    .output = mech_login_output
};