src/lib-sasl/mech-external.c

/* Copyright (c) 2016-2018 Dovecot authors, see the included COPYING file */

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

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

static int
mech_external_input(struct dsasl_client *_client,
            const unsigned char *input ATTR_UNUSED, size_t input_len,
            const char **error_r)
{
    struct external_dsasl_client *client =
        (struct external_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_external_output(struct dsasl_client *_client,
             const unsigned char **output_r, size_t *output_len_r,
             const char **error_r ATTR_UNUSED)
{
    struct external_dsasl_client *client =
        (struct external_dsasl_client *)_client;
    const char *username;

    if (_client->set.authzid != NULL)
        username = _client->set.authzid;
    else if (_client->set.authid != NULL)
        username = _client->set.authid;
    else
        username = "";

    *output_r = (const void *)username;
    *output_len_r = strlen(username);
    client->output_sent = TRUE;
    return 0;
}

const struct dsasl_client_mech dsasl_client_mech_external = {
    .name = "EXTERNAL",
    .struct_size = sizeof(struct external_dsasl_client),

    .input = mech_external_input,
    .output = mech_external_output
};