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annotate sshpty.c @ 1659:d32bcb5c557d

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Add Ed25519 support (#91) * Add support for Ed25519 as a public key type Ed25519 is a elliptic curve signature scheme that offers better security than ECDSA and DSA and good performance. It may be used for both user and host keys. OpenSSH key import and fuzzer are not supported yet. Initially inspired by Peter Szabo. * Add curve25519 and ed25519 fuzzers * Add import and export of Ed25519 keys
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Wed, 11 Mar 2020 21:09:45 +0500
parents 523be406edc4
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copied from OpenSSH-3.5p1 source, modified by Matt Johnston 2003
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5 *
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6 * Author: Tatu Ylonen <[email protected]>
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7 * Copyright (c) 1995 Tatu Ylonen <[email protected]>, Espoo, Finland
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8 * All rights reserved
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9 * Allocating a pseudo-terminal, and making it the controlling tty.
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10 *
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11 * As far as I am concerned, the code I have written for this software
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12 * can be used freely for any purpose. Any derived versions of this
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13 * software must be clearly marked as such, and if the derived work is
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14 * incompatible with the protocol description in the RFC file, it must be
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15 * called by a name other than "ssh" or "Secure Shell".
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16 */
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17
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18 /*RCSID("OpenBSD: sshpty.c,v 1.7 2002/06/24 17:57:20 deraadt Exp ");*/
4
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19
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20 #include "includes.h"
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21 #include "dbutil.h"
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22 #include "errno.h"
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23 #include "sshpty.h"
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24
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25 /* Pty allocated with _getpty gets broken if we do I_PUSH:es to it. */
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26 #if defined(HAVE__GETPTY) || defined(HAVE_OPENPTY)
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27 #undef HAVE_DEV_PTMX
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28 #endif
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29
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30 #ifdef HAVE_PTY_H
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31 # include <pty.h>
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32 #endif
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33 #if defined(USE_DEV_PTMX) && defined(HAVE_STROPTS_H)
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34 # include <stropts.h>
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35 #endif
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36
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37 #ifndef O_NOCTTY
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38 #define O_NOCTTY 0
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39 #endif
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40
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41 /*
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42 * Allocates and opens a pty. Returns 0 if no pty could be allocated, or
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43 * nonzero if a pty was successfully allocated. On success, open file
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44 * descriptors for the pty and tty sides and the name of the tty side are
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45 * returned (the buffer must be able to hold at least 64 characters).
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46 */
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47
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48 int
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49 pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen)
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50 {
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51 #if defined(HAVE_OPENPTY)
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52 /* exists in recent (4.4) BSDs and OSF/1 */
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53 char *name;
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54 int i;
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55
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56 i = openpty(ptyfd, ttyfd, NULL, NULL, NULL);
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57 if (i < 0) {
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58 dropbear_log(LOG_WARNING,
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59 "pty_allocate: openpty: %.100s", strerror(errno));
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60 return 0;
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61 }
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62 name = ttyname(*ttyfd);
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63 if (!name) {
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64 dropbear_exit("ttyname fails for openpty device");
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65 }
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66
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67 strlcpy(namebuf, name, namebuflen); /* possible truncation */
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68 return 1;
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69 #else /* HAVE_OPENPTY */
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70 #ifdef HAVE__GETPTY
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71 /*
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72 * _getpty(3) exists in SGI Irix 4.x, 5.x & 6.x -- it generates more
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73 * pty's automagically when needed
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74 */
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75 char *slave;
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76
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77 slave = _getpty(ptyfd, O_RDWR, 0622, 0);
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78 if (slave == NULL) {
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79 dropbear_log(LOG_WARNING,
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80 "pty_allocate: _getpty: %.100s", strerror(errno));
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81 return 0;
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82 }
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83 strlcpy(namebuf, slave, namebuflen);
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84 /* Open the slave side. */
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85 *ttyfd = open(namebuf, O_RDWR | O_NOCTTY);
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86 if (*ttyfd < 0) {
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87 dropbear_log(LOG_WARNING,
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88 "pty_allocate error: ttyftd open error");
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89 close(*ptyfd);
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90 return 0;
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91 }
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92 return 1;
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93 #else /* HAVE__GETPTY */
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94 #if defined(USE_DEV_PTMX)
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95 /*
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96 * This code is used e.g. on Solaris 2.x. (Note that Solaris 2.3
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97 * also has bsd-style ptys, but they simply do not work.)
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98 *
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99 * Linux systems may have the /dev/ptmx device, but this code won't work.
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100 */
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101 int ptm;
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102 char *pts;
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103
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104 ptm = open("/dev/ptmx", O_RDWR | O_NOCTTY);
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105 if (ptm < 0) {
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106 dropbear_log(LOG_WARNING,
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107 "pty_allocate: /dev/ptmx: %.100s", strerror(errno));
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108 return 0;
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109 }
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110 if (grantpt(ptm) < 0) {
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111 dropbear_log(LOG_WARNING,
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112 "grantpt: %.100s", strerror(errno));
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113 return 0;
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114 }
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115 if (unlockpt(ptm) < 0) {
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116 dropbear_log(LOG_WARNING,
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117 "unlockpt: %.100s", strerror(errno));
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118 return 0;
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119 }
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120 pts = ptsname(ptm);
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121 if (pts == NULL) {
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122 dropbear_log(LOG_WARNING,
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123 "Slave pty side name could not be obtained.");
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124 }
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125 strlcpy(namebuf, pts, namebuflen);
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126 *ptyfd = ptm;
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127
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128 /* Open the slave side. */
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129 *ttyfd = open(namebuf, O_RDWR | O_NOCTTY);
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130 if (*ttyfd < 0) {
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131 dropbear_log(LOG_ERR,
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132 "error opening pts %.100s: %.100s", namebuf, strerror(errno));
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133 close(*ptyfd);
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134 return 0;
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135 }
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136 #if !defined(HAVE_CYGWIN) && defined(I_PUSH)
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137 /*
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138 * Push the appropriate streams modules, as described in Solaris pts(7).
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139 * HP-UX pts(7) doesn't have ttcompat module.
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140 */
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141 if (ioctl(*ttyfd, I_PUSH, "ptem") < 0) {
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142 dropbear_log(LOG_WARNING,
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143 "ioctl I_PUSH ptem: %.100s", strerror(errno));
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144 }
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145 if (ioctl(*ttyfd, I_PUSH, "ldterm") < 0) {
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146 dropbear_log(LOG_WARNING,
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147 "ioctl I_PUSH ldterm: %.100s", strerror(errno));
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148 }
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149 #ifndef __hpux
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150 if (ioctl(*ttyfd, I_PUSH, "ttcompat") < 0) {
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151 dropbear_log(LOG_WARNING,
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152 "ioctl I_PUSH ttcompat: %.100s", strerror(errno));
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153 }
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154 #endif
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155 #endif
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156 return 1;
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157 #else /* USE_DEV_PTMX */
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158 #ifdef HAVE_DEV_PTS_AND_PTC
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159 /* AIX-style pty code. */
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160 const char *name;
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161
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162 *ptyfd = open("/dev/ptc", O_RDWR | O_NOCTTY);
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163 if (*ptyfd < 0) {
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164 dropbear_log(LOG_ERR,
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165 "Could not open /dev/ptc: %.100s", strerror(errno));
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166 return 0;
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167 }
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168 name = ttyname(*ptyfd);
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169 if (!name) {
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170 dropbear_exit("ttyname fails for /dev/ptc device");
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171 }
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172 strlcpy(namebuf, name, namebuflen);
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173 *ttyfd = open(name, O_RDWR | O_NOCTTY);
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174 if (*ttyfd < 0) {
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175 dropbear_log(LOG_ERR,
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176 "Could not open pty slave side %.100s: %.100s",
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177 name, strerror(errno));
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178 close(*ptyfd);
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179 return 0;
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180 }
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181 return 1;
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182 #else /* HAVE_DEV_PTS_AND_PTC */
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183
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184 /* BSD-style pty code. */
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185 char buf[64];
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186 int i;
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187 const char *ptymajors = "pqrstuvwxyzabcdefghijklmnoABCDEFGHIJKLMNOPQRSTUVWXYZ";
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188 const char *ptyminors = "0123456789abcdef";
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189 int num_minors = strlen(ptyminors);
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190 int num_ptys = strlen(ptymajors) * num_minors;
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191 struct termios tio;
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192
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193 for (i = 0; i < num_ptys; i++) {
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194 snprintf(buf, sizeof buf, "/dev/pty%c%c", ptymajors[i / num_minors],
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195 ptyminors[i % num_minors]);
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196 snprintf(namebuf, namebuflen, "/dev/tty%c%c",
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197 ptymajors[i / num_minors], ptyminors[i % num_minors]);
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198
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199 *ptyfd = open(buf, O_RDWR | O_NOCTTY);
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200 if (*ptyfd < 0) {
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201 /* Try SCO style naming */
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202 snprintf(buf, sizeof buf, "/dev/ptyp%d", i);
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203 snprintf(namebuf, namebuflen, "/dev/ttyp%d", i);
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204 *ptyfd = open(buf, O_RDWR | O_NOCTTY);
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205 if (*ptyfd < 0) {
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206 continue;
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207 }
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208 }
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209
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210 /* Open the slave side. */
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211 *ttyfd = open(namebuf, O_RDWR | O_NOCTTY);
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212 if (*ttyfd < 0) {
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213 dropbear_log(LOG_ERR,
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214 "pty_allocate: %.100s: %.100s", namebuf, strerror(errno));
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215 close(*ptyfd);
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216 return 0;
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217 }
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218 /* set tty modes to a sane state for broken clients */
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219 if (tcgetattr(*ptyfd, &tio) < 0) {
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220 dropbear_log(LOG_WARNING,
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221 "ptyallocate: tty modes failed: %.100s", strerror(errno));
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222 } else {
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223 tio.c_lflag |= (ECHO | ISIG | ICANON);
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224 tio.c_oflag |= (OPOST | ONLCR);
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225 tio.c_iflag |= ICRNL;
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226
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227 /* Set the new modes for the terminal. */
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228 if (tcsetattr(*ptyfd, TCSANOW, &tio) < 0) {
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229 dropbear_log(LOG_WARNING,
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230 "Setting tty modes for pty failed: %.100s",
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231 strerror(errno));
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232 }
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233 }
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234
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235 return 1;
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236 }
594
a98a2138364a Improve capitalisation for all logged strings
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parents: 38
diff changeset
237 dropbear_log(LOG_WARNING, "Failed to open any /dev/pty?? devices");
4
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238 return 0;
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239 #endif /* HAVE_DEV_PTS_AND_PTC */
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240 #endif /* USE_DEV_PTMX */
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241 #endif /* HAVE__GETPTY */
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242 #endif /* HAVE_OPENPTY */
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243 }
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244
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245 /* Releases the tty. Its ownership is returned to root, and permissions to 0666. */
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246
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247 void
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248 pty_release(const char *tty_name)
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249 {
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250 if (chown(tty_name, (uid_t) 0, (gid_t) 0) < 0
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parents:
diff changeset
251 && (errno != ENOENT)) {
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252 dropbear_log(LOG_ERR,
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253 "chown %.100s 0 0 failed: %.100s", tty_name, strerror(errno));
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254 }
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255 if (chmod(tty_name, (mode_t) 0666) < 0
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parents:
diff changeset
256 && (errno != ENOENT)) {
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257 dropbear_log(LOG_ERR,
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258 "chmod %.100s 0666 failed: %.100s", tty_name, strerror(errno));
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259 }
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260 }
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261
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diff changeset
262 /* Makes the tty the processes controlling tty and sets it to sane modes. */
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263
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264 void
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265 pty_make_controlling_tty(int *ttyfd, const char *tty_name)
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266 {
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267 int fd;
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268 #ifdef USE_VHANGUP
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269 void *old;
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270 #endif /* USE_VHANGUP */
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271
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diff changeset
272 /* Solaris has a problem with TIOCNOTTY for a bg process, so
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273 * we disable the signal which would STOP the process - matt */
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274 signal(SIGTTOU, SIG_IGN);
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275
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276 /* First disconnect from the old controlling tty. */
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277 #ifdef TIOCNOTTY
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278 fd = open(_PATH_TTY, O_RDWR | O_NOCTTY);
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279 if (fd >= 0) {
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280 (void) ioctl(fd, TIOCNOTTY, NULL);
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281 close(fd);
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282 }
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283 #endif /* TIOCNOTTY */
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diff changeset
284 if (setsid() < 0) {
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285 dropbear_log(LOG_ERR,
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diff changeset
286 "setsid: %.100s", strerror(errno));
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287 }
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288
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289 /*
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290 * Verify that we are successfully disconnected from the controlling
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291 * tty.
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292 */
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293 fd = open(_PATH_TTY, O_RDWR | O_NOCTTY);
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diff changeset
294 if (fd >= 0) {
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295 dropbear_log(LOG_ERR,
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296 "Failed to disconnect from controlling tty.\n");
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297 close(fd);
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298 }
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diff changeset
299 /* Make it our controlling tty. */
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diff changeset
300 #ifdef TIOCSCTTY
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parents:
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301 if (ioctl(*ttyfd, TIOCSCTTY, NULL) < 0) {
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diff changeset
302 dropbear_log(LOG_ERR,
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303 "ioctl(TIOCSCTTY): %.100s", strerror(errno));
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304 }
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305 #endif /* TIOCSCTTY */
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306 #ifdef HAVE_NEWS4
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307 if (setpgrp(0,0) < 0) {
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308 dropbear_log(LOG_ERR,
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309 error("SETPGRP %s",strerror(errno)));
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310 }
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311 #endif /* HAVE_NEWS4 */
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312 #ifdef USE_VHANGUP
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313 old = mysignal(SIGHUP, SIG_IGN);
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314 vhangup();
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315 mysignal(SIGHUP, old);
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316 #endif /* USE_VHANGUP */
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317 fd = open(tty_name, O_RDWR);
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318 if (fd < 0) {
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319 dropbear_log(LOG_ERR,
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320 "%.100s: %.100s", tty_name, strerror(errno));
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321 } else {
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322 #ifdef USE_VHANGUP
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323 close(*ttyfd);
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324 *ttyfd = fd;
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325 #else /* USE_VHANGUP */
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326 close(fd);
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327 #endif /* USE_VHANGUP */
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328 }
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329 /* Verify that we now have a controlling tty. */
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330 fd = open(_PATH_TTY, O_WRONLY);
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331 if (fd < 0) {
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332 dropbear_log(LOG_ERR,
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333 "open /dev/tty failed - could not set controlling tty: %.100s",
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334 strerror(errno));
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335 } else {
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336 close(fd);
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337 }
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338 }
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339
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340 /* Changes the window size associated with the pty. */
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341
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342 void
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343 pty_change_window_size(int ptyfd, int row, int col,
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344 int xpixel, int ypixel)
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345 {
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346 struct winsize w;
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347
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348 w.ws_row = row;
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349 w.ws_col = col;
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350 w.ws_xpixel = xpixel;
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351 w.ws_ypixel = ypixel;
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352 (void) ioctl(ptyfd, TIOCSWINSZ, &w);
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353 }
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354
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355 void
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356 pty_setowner(struct passwd *pw, const char *tty_name)
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357 {
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358 struct group *grp;
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359 gid_t gid;
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360 mode_t mode;
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361 struct stat st;
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362
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363 /* Determine the group to make the owner of the tty. */
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364 grp = getgrnam("tty");
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365 if (grp) {
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366 gid = grp->gr_gid;
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367 mode = S_IRUSR | S_IWUSR | S_IWGRP;
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368 } else {
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369 gid = pw->pw_gid;
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370 mode = S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH;
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371 }
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372
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373 /*
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374 * Change owner and mode of the tty as required.
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375 * Warn but continue if filesystem is read-only and the uids match/
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376 * tty is owned by root.
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377 */
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378 if (stat(tty_name, &st)) {
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379 dropbear_exit("pty_setowner: stat(%.101s) failed: %.100s",
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380 tty_name, strerror(errno));
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381 }
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382
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383 if (st.st_uid != pw->pw_uid || st.st_gid != gid) {
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diff changeset
384 if (chown(tty_name, pw->pw_uid, gid) < 0) {
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diff changeset
385 if (errno == EROFS &&
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386 (st.st_uid == pw->pw_uid || st.st_uid == 0)) {
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diff changeset
387 dropbear_log(LOG_ERR,
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388 "chown(%.100s, %u, %u) failed: %.100s",
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389 tty_name, (unsigned int)pw->pw_uid, (unsigned int)gid,
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diff changeset
390 strerror(errno));
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parents:
diff changeset
391 } else {
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392 dropbear_exit("chown(%.100s, %u, %u) failed: %.100s",
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diff changeset
393 tty_name, (unsigned int)pw->pw_uid, (unsigned int)gid,
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parents:
diff changeset
394 strerror(errno));
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parents:
diff changeset
395 }
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parents:
diff changeset
396 }
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parents:
diff changeset
397 }
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398
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diff changeset
399 if ((st.st_mode & (S_IRWXU|S_IRWXG|S_IRWXO)) != mode) {
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parents:
diff changeset
400 if (chmod(tty_name, mode) < 0) {
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parents:
diff changeset
401 if (errno == EROFS &&
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parents:
diff changeset
402 (st.st_mode & (S_IRGRP | S_IROTH)) == 0) {
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parents:
diff changeset
403 dropbear_log(LOG_ERR,
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parents:
diff changeset
404 "chmod(%.100s, 0%o) failed: %.100s",
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parents:
diff changeset
405 tty_name, mode, strerror(errno));
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parents:
diff changeset
406 } else {
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parents:
diff changeset
407 dropbear_exit("chmod(%.100s, 0%o) failed: %.100s",
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parents:
diff changeset
408 tty_name, mode, strerror(errno));
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parents:
diff changeset
409 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
410 }
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
411 }
fe6bca95afa7 Makefile.in contains updated files required
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parents:
diff changeset
412 }