src/lib-sasl/mech-plain.c

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

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

struct plain_dsasl_client {
    struct dsasl_client client;
    bool output_sent;
};

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

    if (!client->output_sent) {
        if (input_len > 0) {
            *error_r = "Server sent non-empty initial response";
            return -1;
        }
    } else {
        *error_r = "Server didn't finish authentication";
        return -1;
    }
    return 0;
}

static int
mech_plain_output(struct dsasl_client *_client,
          const unsigned char **output_r, size_t *output_len_r,
          const char **error_r)
{
    struct plain_dsasl_client *client =
        (struct plain_dsasl_client *)_client;
    string_t *str;

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

    str = str_new(_client->pool, 64);
    if (_client->set.authzid != NULL)
        str_append(str, _client->set.authzid);
    str_append_c(str, '\0');
    str_append(str, _client->set.authid);
    str_append_c(str, '\0');
    str_append(str, _client->password);

    *output_r = str_data(str);
    *output_len_r = str_len(str);
    client->output_sent = TRUE;
    return 0;
}

const struct dsasl_client_mech dsasl_client_mech_plain = {
    .name = "PLAIN",
    .struct_size = sizeof(struct plain_dsasl_client),

    .input = mech_plain_input,
    .output = mech_plain_output
};