Mercurial > dropbear

annotate channel.h @ 1861:2b3a8026a6ce

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Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Jan 2022 10:14:56 +0800
parents 1d86a58fb52d
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 #ifndef DROPBEAR_CHANNEL_H_
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26 #define DROPBEAR_CHANNEL_H_
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28 #include "includes.h"
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29 #include "buffer.h"
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30 #include "circbuffer.h"
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31 #include "netio.h"
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33 #define SSH_OPEN_ADMINISTRATIVELY_PROHIBITED 1
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34 #define SSH_OPEN_CONNECT_FAILED 2
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35 #define SSH_OPEN_UNKNOWN_CHANNEL_TYPE 3
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36 #define SSH_OPEN_RESOURCE_SHORTAGE 4
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38 /* Not a real type */
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39 #define SSH_OPEN_IN_PROGRESS 99
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41 #define CHAN_EXTEND_SIZE 3 /* how many extra slots to add when we need more */
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42
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43 struct ChanType;
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44
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45 struct Channel {
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46
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47 unsigned int index; /* the local channel index */
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48 unsigned int remotechan;
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49 unsigned int recvwindow, transwindow;
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50 unsigned int recvdonelen;
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51 unsigned int recvmaxpacket, transmaxpacket;
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52 void* typedata; /* a pointer to type specific data */
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53 int writefd; /* read from wire, written to insecure side */
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54 int readfd; /* read from insecure side, written to wire */
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55 int errfd; /* used like writefd or readfd, depending if it's client or server.
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56 Doesn't exactly belong here, but is cleaner here */
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57 int bidir_fd; /* a boolean indicating that writefd/readfd are the same
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58 file descriptor (bidirectional), such as a network socket or PTY.
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59 That is handled differently when closing FDs */
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60 circbuffer *writebuf; /* data from the wire, for local consumption. Can be
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61 initially NULL */
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62 circbuffer *extrabuf; /* extended-data for the program - used like writebuf
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63 but for stderr */
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65 /* whether close/eof messages have been exchanged */
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66 int sent_close, recv_close;
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67 int recv_eof, sent_eof;
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68 /* once flushing is set, readfd will close once no more data is available
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69 (not waiting for EOF) */
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70 int flushing;
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71
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72 struct dropbear_progress_connection *conn_pending;
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73 int initconn; /* used for TCP forwarding, whether the channel has been
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74 fully initialised */
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76 int await_open; /* flag indicating whether we've sent an open request
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77 for this channel (and are awaiting a confirmation
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78 or failure). */
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79
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80 /* Used by client chansession to handle ~ escaping, NULL ignored otherwise */
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81 void (*read_mangler)(const struct Channel*, const unsigned char* bytes, int *len);
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82
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83 const struct ChanType* type;
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84
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85 enum dropbear_prio prio;
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86 };
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87
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88 struct ChanType {
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89
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90 const char *name;
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91 /* Sets up the channel */
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92 int (*inithandler)(struct Channel*);
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93 /* Called to check whether a channel should close, separately from the FD being EOF.
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94 Used for noticing process exiting */
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95 int (*check_close)(struct Channel*);
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96 /* Handler for ssh_msg_channel_request */
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97 void (*reqhandler)(struct Channel*);
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98 /* Called prior to sending ssh_msg_channel_close, used for sending exit status */
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99 void (*closehandler)(const struct Channel*);
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100 /* Frees resources, called just prior to channel being removed */
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101 void (*cleanup)(const struct Channel*);
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102 };
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103
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104 /* Callback for connect_remote. errstring may be NULL if result == DROPBEAR_SUCCESS */
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105 void channel_connect_done(int result, int sock, void* user_data, const char* errstring);
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107 void chaninitialise(const struct ChanType *chantypes[]);
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108 void chancleanup(void);
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109 void setchannelfds(fd_set *readfds, fd_set *writefds, int allow_reads);
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110 void channelio(const fd_set *readfd, const fd_set *writefd);
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111 struct Channel* getchannel(void);
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112 /* Returns an arbitrary channel that is in a ready state - not
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113 being initialised and no EOF in either direction. NULL if none. */
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114 struct Channel* get_any_ready_channel(void);
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116 void recv_msg_channel_open(void);
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117 void recv_msg_channel_request(void);
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118 void send_msg_channel_failure(const struct Channel *channel);
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119 void send_msg_channel_success(const struct Channel *channel);
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120 void recv_msg_channel_data(void);
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121 void recv_msg_channel_extended_data(void);
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122 void recv_msg_channel_window_adjust(void);
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123 void recv_msg_channel_close(void);
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124 void recv_msg_channel_eof(void);
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126 void common_recv_msg_channel_data(struct Channel *channel, int fd,
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127 circbuffer * buf);
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128
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129 #if DROPBEAR_CLIENT
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130 extern const struct ChanType clichansess;
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131 #endif
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132
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133 #if DROPBEAR_LISTENERS || DROPBEAR_CLIENT
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134 int send_msg_channel_open_init(int fd, const struct ChanType *type);
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135 void recv_msg_channel_open_confirmation(void);
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136 void recv_msg_channel_open_failure(void);
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137 #endif
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138 void start_send_channel_request(const struct Channel *channel, const char *type);
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9169e4e7cbee fix empty C prototypes
Francois Perrad <francois.perrad@gadz.org>
parents: 1097
diff changeset
140 void send_msg_request_success(void);
9169e4e7cbee fix empty C prototypes
Francois Perrad <francois.perrad@gadz.org>
parents: 1097
diff changeset
141 void send_msg_request_failure(void);
937
4ad38e223ccd Send a failure response if a client receives a global request
Matt Johnston <matt@ucc.asn.au>
parents: 722
diff changeset
142
970
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 941
diff changeset
143
1036
deed0571cacc DROPBEAR_ prefix for include guards to avoid collisions
Thorsten Horstmann <thorsten.horstmann@web.de>
parents: 970
diff changeset
144 #endif /* DROPBEAR_CHANNEL_H_ */