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annotate sshpty.c @ 1630:9579377b5f8b

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use strlcpy & strlcat (#74) * refactor checkpubkeyperms() with safe BSD functions fix gcc8 warnings ``` svr-authpubkey.c: In function 'checkpubkeyperms': svr-authpubkey.c:427:2: warning: 'strncat' specified bound 5 equals source length [-Wstringop-overflow=] strncat(filename, "/.ssh", 5); /* strlen("/.ssh") == 5 */ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ svr-authpubkey.c:433:2: warning: 'strncat' specified bound 16 equals source length [-Wstringop-overflow=] strncat(filename, "/authorized_keys", 16); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ``` see https://www.sudo.ws/todd/papers/strlcpy.html * restore strlcpy in xstrdup see original https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/xmalloc.c?rev=1.16
author François Perrad <francois.perrad@gadz.org>
date Wed, 20 Mar 2019 15:09:19 +0100
parents 523be406edc4
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 * 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
38
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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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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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diff changeset
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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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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301 if (ioctl(*ttyfd, TIOCSCTTY, NULL) < 0) {
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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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384 if (chown(tty_name, pw->pw_uid, gid) < 0) {
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385 if (errno == EROFS &&
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386 (st.st_uid == pw->pw_uid || st.st_uid == 0)) {
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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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390 strerror(errno));
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391 } else {
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392 dropbear_exit("chown(%.100s, %u, %u) failed: %.100s",
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393 tty_name, (unsigned int)pw->pw_uid, (unsigned int)gid,
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394 strerror(errno));
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395 }
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396 }
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397 }
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398
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399 if ((st.st_mode & (S_IRWXU|S_IRWXG|S_IRWXO)) != mode) {
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400 if (chmod(tty_name, mode) < 0) {
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diff changeset
401 if (errno == EROFS &&
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402 (st.st_mode & (S_IRGRP | S_IROTH)) == 0) {
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diff changeset
403 dropbear_log(LOG_ERR,
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diff changeset
404 "chmod(%.100s, 0%o) failed: %.100s",
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405 tty_name, mode, strerror(errno));
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406 } else {
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407 dropbear_exit("chmod(%.100s, 0%o) failed: %.100s",
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408 tty_name, mode, strerror(errno));
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409 }
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410 }
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411 }
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412 }