Mercurial > dropbear
view dbutil.h @ 994:5c5ade336926
Prefer stronger algorithms in algorithm negotiation.
Prefer diffie-hellman-group14-sha1 (2048 bit) over
diffie-hellman-group1-sha1 (1024 bit).
Due to meet-in-the-middle attacks the effective key length of
three key 3DES is 112 bits. AES is stronger and faster then 3DES.
Prefer to delay the start of compression until after authentication
has completed. This avoids exposing compression code to attacks
from unauthenticated users.
(github pull request #9)
author | Fedor Brunner <fedor.brunner@azet.sk> |
---|---|
date | Fri, 23 Jan 2015 23:00:25 +0800 |
parents | f92eb625c48d |
children | 6fb4c010c448 |
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/* * Dropbear - a SSH2 server * * Copyright (c) 2002,2003 Matt Johnston * All rights reserved. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #ifndef _DBUTIL_H_ #define _DBUTIL_H_ #include "includes.h" #include "buffer.h" #ifndef DISABLE_SYSLOG void startsyslog(); #endif #ifdef __GNUC__ #define ATTRIB_PRINTF(fmt,args) __attribute__((format(printf, fmt, args))) #define ATTRIB_NORETURN __attribute__((noreturn)) #define ATTRIB_SENTINEL __attribute__((sentinel)) #else #define ATTRIB_PRINTF(fmt,args) #define ATTRIB_NORETURN #define ATTRIB_SENTINEL #endif extern void (*_dropbear_exit)(int exitcode, const char* format, va_list param) ATTRIB_NORETURN; extern void (*_dropbear_log)(int priority, const char* format, va_list param); void dropbear_exit(const char* format, ...) ATTRIB_PRINTF(1,2) ATTRIB_NORETURN; void dropbear_close(const char* format, ...) ATTRIB_PRINTF(1,2) ; void dropbear_log(int priority, const char* format, ...) ATTRIB_PRINTF(2,3) ; void fail_assert(const char* expr, const char* file, int line) ATTRIB_NORETURN; #ifdef DEBUG_TRACE void dropbear_trace(const char* format, ...) ATTRIB_PRINTF(1,2); void dropbear_trace2(const char* format, ...) ATTRIB_PRINTF(1,2); void printhex(const char * label, const unsigned char * buf, int len); void printmpint(const char *label, mp_int *mp); extern int debug_trace; #endif enum dropbear_prio { DROPBEAR_PRIO_DEFAULT = 10, DROPBEAR_PRIO_LOWDELAY = 11, DROPBEAR_PRIO_BULK = 12, }; char * stripcontrol(const char * text); void get_socket_address(int fd, char **local_host, char **local_port, char **remote_host, char **remote_port, int host_lookup); void getaddrstring(struct sockaddr_storage* addr, char **ret_host, char **ret_port, int host_lookup); void set_sock_nodelay(int sock); void set_sock_priority(int sock, enum dropbear_prio prio); int dropbear_listen(const char* address, const char* port, int *socks, unsigned int sockcount, char **errstring, int *maxfd); int spawn_command(void(*exec_fn)(void *user_data), void *exec_data, int *writefd, int *readfd, int *errfd, pid_t *pid); void run_shell_command(const char* cmd, unsigned int maxfd, char* usershell); #ifdef ENABLE_CONNECT_UNIX int connect_unix(const char* addr); #endif int connect_remote(const char* remotehost, const char* remoteport, int nonblocking, char ** errstring); int buf_readfile(buffer* buf, const char* filename); int buf_getline(buffer * line, FILE * authfile); void m_close(int fd); void * m_malloc(size_t size); void * m_strdup(const char * str); void * m_realloc(void* ptr, size_t size); #define m_free(X) free(X); (X) = NULL; void m_burn(void* data, unsigned int len); void setnonblocking(int fd); void disallow_core(); int m_str_to_uint(const char* str, unsigned int *val); /* Used to force mp_ints to be initialised */ #define DEF_MP_INT(X) mp_int X = {0, 0, 0, NULL} /* Dropbear assertion */ #define dropbear_assert(X) do { if (!(X)) { fail_assert(#X, __FILE__, __LINE__); } } while (0) /* Returns 0 if a and b have the same contents */ int constant_time_memcmp(const void* a, const void *b, size_t n); /* Returns a time in seconds that doesn't go backwards - does not correspond to a real-world clock */ time_t monotonic_now(); #endif /* _DBUTIL_H_ */