108 lines
2.5 KiB
C
108 lines
2.5 KiB
C
/*
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* ssh.c: SSH service detection plugin
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*
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* Copyright (c) 2014, Přemysl Janouch <p@janouch.name>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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*/
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#include "config.h"
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#include "../liberty/liberty.c"
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#include "../plugin-api.h"
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// --- Service detection -------------------------------------------------------
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static struct plugin_data
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{
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void *ctx; ///< Application context
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struct plugin_api *api; ///< Plugin API vtable
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}
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g_data;
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struct scan_data
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{
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struct unit *u; ///< Scan unit
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struct str input; ///< Input buffer
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};
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static void *
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scan_init (struct service *service, struct unit *u)
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{
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(void) service;
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struct scan_data *scan = xcalloc (1, sizeof *scan);
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scan->input = str_make ();
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scan->u = u;
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return scan;
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}
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static void
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scan_free (void *handle)
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{
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struct scan_data *scan = handle;
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str_free (&scan->input);
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free (scan);
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}
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static void
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on_data (void *handle, const void *data, size_t len)
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{
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// See RFC 4253 -- we check for a valid SSH banner
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struct scan_data *scan = handle;
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if (scan->input.len + len > 255)
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goto end_scan;
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str_append_data (&scan->input, data, len);
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char *input = scan->input.str;
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char *nl = strstr (input, "\r\n");
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if (!nl)
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return;
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if (strncmp (input, "SSH-", 4))
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goto end_scan;
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*nl = '\0';
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g_data.api->unit_add_info (scan->u, input);
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g_data.api->unit_set_success (scan->u, true);
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end_scan:
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g_data.api->unit_stop (scan->u);
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}
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static struct service g_ssh_service =
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{
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.name = "SSH",
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.flags = 0,
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.scan_init = scan_init,
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.scan_free = scan_free,
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.on_data = on_data,
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.on_eof = NULL,
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.on_error = NULL,
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.on_stopped = NULL
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};
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static bool
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initialize (void *ctx, struct plugin_api *api)
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{
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g_data = (struct plugin_data) { .ctx = ctx, .api = api };
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api->register_service (ctx, &g_ssh_service);
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return true;
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}
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struct plugin_info ponymap_plugin_info =
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{
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.api_version = API_VERSION,
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.initialize = initialize
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};
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