1 | /* |
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2 | * Copyright (c) 1983, 1993, 1994 |
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3 | * The Regents of the University of California. All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * 1. Redistributions of source code must retain the above copyright |
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9 | * notice, this list of conditions and the following disclaimer. |
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10 | * 2. Redistributions in binary form must reproduce the above copyright |
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11 | * notice, this list of conditions and the following disclaimer in the |
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12 | * documentation and/or other materials provided with the distribution. |
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13 | * 3. All advertising materials mentioning features or use of this software |
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14 | * must display the following acknowledgement: |
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15 | * This product includes software developed by the University of |
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16 | * California, Berkeley and its contributors. |
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17 | * 4. Neither the name of the University nor the names of its contributors |
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18 | * may be used to endorse or promote products derived from this software |
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19 | * without specific prior written permission. |
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20 | * |
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21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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31 | * SUCH DAMAGE. |
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32 | * |
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33 | * $Id$ |
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34 | */ |
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35 | |
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36 | #if defined(LIBC_SCCS) && !defined(lint) |
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37 | static char sccsid[] = "@(#)rcmd.c 8.3 (Berkeley) 3/26/94"; |
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38 | #endif /* LIBC_SCCS and not lint */ |
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39 | |
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40 | #include <sys/param.h> |
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41 | #include <sys/socket.h> |
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42 | #include <sys/stat.h> |
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43 | |
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44 | #include <netinet/in.h> |
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45 | #include <arpa/inet.h> |
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46 | |
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47 | #include <signal.h> |
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48 | #include <fcntl.h> |
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49 | #include <netdb.h> |
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50 | #include <unistd.h> |
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51 | #include <pwd.h> |
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52 | #include <errno.h> |
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53 | #include <stdio.h> |
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54 | #include <ctype.h> |
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55 | #include <string.h> |
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56 | #ifdef YP |
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57 | #include <rpc/rpc.h> |
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58 | #include <rpcsvc/yp_prot.h> |
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59 | #include <rpcsvc/ypclnt.h> |
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60 | #endif |
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61 | |
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62 | #include <sys/select.h> |
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63 | |
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64 | |
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65 | #define max(a, b) ((a > b) ? a : b) |
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66 | |
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67 | #ifdef __rtems__ |
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68 | int rresvport(); |
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69 | #define bzero(a,s) memset((a),0,(s)) |
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70 | #define bcmp memcmp |
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71 | #define bcopy(s,d,i) memcpy(d,s,i) |
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72 | int bindresvport(int, struct sockaddr_in *); |
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73 | #else /* __rtems__ */ |
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74 | |
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75 | extern int innetgr __P(( const char *, const char *, const char *, const char * )); |
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76 | |
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77 | int __ivaliduser __P((FILE *, u_long, const char *, const char *)); |
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78 | static int __icheckhost __P((u_long, char *)); |
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79 | |
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80 | #endif |
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81 | |
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82 | int |
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83 | rcmd(ahost, rport, locuser, remuser, cmd, fd2p) |
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84 | char **ahost; |
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85 | u_short rport; |
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86 | const char *locuser, *remuser, *cmd; |
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87 | int *fd2p; |
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88 | { |
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89 | struct hostent *hp; |
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90 | struct sockaddr_in sin, from; |
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91 | fd_set reads; |
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92 | #ifndef __rtems__ |
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93 | long oldmask; |
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94 | #endif |
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95 | pid_t pid; |
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96 | int s, lport, timo; |
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97 | char c; |
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98 | |
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99 | pid = getpid(); |
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100 | hp = gethostbyname(*ahost); |
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101 | if (hp == NULL) { |
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102 | herror(*ahost); |
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103 | return (-1); |
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104 | } |
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105 | *ahost = hp->h_name; |
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106 | #ifndef __rtems__ |
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107 | oldmask = sigblock(sigmask(SIGURG)); |
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108 | #endif |
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109 | for (timo = 1, lport = IPPORT_RESERVED - 1;;) { |
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110 | s = rresvport(&lport); |
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111 | if (s < 0) { |
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112 | if (errno == EAGAIN) |
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113 | (void)fprintf(stderr, |
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114 | "rcmd: socket: All ports in use\n"); |
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115 | else |
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116 | (void)fprintf(stderr, "rcmd: socket: %s\n", |
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117 | strerror(errno)); |
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118 | #ifndef __rtems__ |
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119 | sigsetmask(oldmask); |
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120 | #endif |
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121 | return (-1); |
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122 | } |
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123 | fcntl(s, F_SETOWN, pid); |
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124 | bzero(&sin, sizeof sin); |
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125 | sin.sin_len = sizeof(struct sockaddr_in); |
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126 | sin.sin_family = hp->h_addrtype; |
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127 | sin.sin_port = rport; |
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128 | bcopy(hp->h_addr_list[0], &sin.sin_addr, MIN(hp->h_length, sizeof sin.sin_addr)); |
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129 | if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0) |
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130 | break; |
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131 | (void)close(s); |
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132 | if (errno == EADDRINUSE) { |
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133 | lport--; |
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134 | continue; |
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135 | } |
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136 | if (errno == ECONNREFUSED && timo <= 16) { |
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137 | (void)sleep(timo); |
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138 | timo *= 2; |
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139 | continue; |
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140 | } |
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141 | if (hp->h_addr_list[1] != NULL) { |
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142 | int oerrno = errno; |
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143 | |
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144 | (void)fprintf(stderr, "connect to address %s: ", |
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145 | inet_ntoa(sin.sin_addr)); |
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146 | errno = oerrno; |
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147 | perror(0); |
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148 | hp->h_addr_list++; |
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149 | bcopy(hp->h_addr_list[0], &sin.sin_addr, MIN(hp->h_length, sizeof sin.sin_addr)); |
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150 | (void)fprintf(stderr, "Trying %s...\n", |
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151 | inet_ntoa(sin.sin_addr)); |
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152 | continue; |
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153 | } |
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154 | (void)fprintf(stderr, "%s: %s\n", hp->h_name, strerror(errno)); |
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155 | #ifndef __rtems__ |
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156 | sigsetmask(oldmask); |
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157 | #endif |
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158 | return (-1); |
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159 | } |
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160 | lport--; |
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161 | if (fd2p == 0) { |
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162 | write(s, "", 1); |
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163 | lport = 0; |
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164 | } else { |
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165 | char num[8]; |
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166 | int s2 = rresvport(&lport), s3; |
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167 | int len = sizeof(from); |
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168 | int nfds; |
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169 | |
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170 | if (s2 < 0) |
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171 | goto bad; |
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172 | listen(s2, 1); |
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173 | (void)snprintf(num, sizeof(num), "%d", lport); |
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174 | if (write(s, num, strlen(num)+1) != strlen(num)+1) { |
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175 | (void)fprintf(stderr, |
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176 | "rcmd: write (setting up stderr): %s\n", |
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177 | strerror(errno)); |
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178 | (void)close(s2); |
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179 | goto bad; |
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180 | } |
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181 | nfds = max(s, s2)+1; |
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182 | if(nfds > FD_SETSIZE) { |
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183 | fprintf(stderr, "rcmd: too many files\n"); |
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184 | (void)close(s2); |
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185 | goto bad; |
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186 | } |
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187 | again: |
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188 | FD_ZERO(&reads); |
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189 | FD_SET(s, &reads); |
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190 | FD_SET(s2, &reads); |
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191 | errno = 0; |
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192 | if (select(nfds, &reads, 0, 0, 0) < 1 || !FD_ISSET(s2, &reads)){ |
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193 | if (errno != 0) |
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194 | (void)fprintf(stderr, |
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195 | "rcmd: select (setting up stderr): %s\n", |
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196 | strerror(errno)); |
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197 | else |
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198 | (void)fprintf(stderr, |
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199 | "select: protocol failure in circuit setup\n"); |
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200 | (void)close(s2); |
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201 | goto bad; |
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202 | } |
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203 | s3 = accept(s2, (struct sockaddr *)&from, &len); |
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204 | /* |
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205 | * XXX careful for ftp bounce attacks. If discovered, shut them |
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206 | * down and check for the real auxiliary channel to connect. |
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207 | */ |
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208 | if (from.sin_family == AF_INET && from.sin_port == htons(20)) { |
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209 | close(s3); |
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210 | goto again; |
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211 | } |
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212 | (void)close(s2); |
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213 | if (s3 < 0) { |
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214 | (void)fprintf(stderr, |
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215 | "rcmd: accept: %s\n", strerror(errno)); |
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216 | lport = 0; |
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217 | goto bad; |
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218 | } |
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219 | *fd2p = s3; |
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220 | from.sin_port = ntohs((u_short)from.sin_port); |
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221 | if (from.sin_family != AF_INET || |
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222 | from.sin_port >= IPPORT_RESERVED || |
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223 | from.sin_port < IPPORT_RESERVED / 2) { |
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224 | (void)fprintf(stderr, |
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225 | "socket: protocol failure in circuit setup.\n"); |
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226 | goto bad2; |
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227 | } |
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228 | } |
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229 | (void)write(s, locuser, strlen(locuser)+1); |
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230 | (void)write(s, remuser, strlen(remuser)+1); |
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231 | (void)write(s, cmd, strlen(cmd)+1); |
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232 | if (read(s, &c, 1) != 1) { |
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233 | (void)fprintf(stderr, |
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234 | "rcmd: %s: %s\n", *ahost, strerror(errno)); |
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235 | goto bad2; |
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236 | } |
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237 | if (c != 0) { |
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238 | while (read(s, &c, 1) == 1) { |
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239 | (void)write(STDERR_FILENO, &c, 1); |
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240 | if (c == '\n') |
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241 | break; |
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242 | } |
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243 | goto bad2; |
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244 | } |
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245 | #ifndef __rtems__ |
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246 | sigsetmask(oldmask); |
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247 | #endif |
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248 | return (s); |
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249 | bad2: |
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250 | if (lport) |
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251 | (void)close(*fd2p); |
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252 | bad: |
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253 | (void)close(s); |
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254 | #ifndef __rtems__ |
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255 | sigsetmask(oldmask); |
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256 | #endif |
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257 | return (-1); |
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258 | } |
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259 | |
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260 | int |
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261 | rresvport(alport) |
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262 | int *alport; |
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263 | { |
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264 | struct sockaddr_in sin; |
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265 | int s; |
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266 | |
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267 | bzero(&sin, sizeof sin); |
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268 | sin.sin_len = sizeof(struct sockaddr_in); |
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269 | sin.sin_family = AF_INET; |
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270 | sin.sin_addr.s_addr = INADDR_ANY; |
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271 | s = socket(AF_INET, SOCK_STREAM, 0); |
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272 | if (s < 0) |
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273 | return (-1); |
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274 | #if 0 /* compat_exact_traditional_rresvport_semantics */ |
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275 | sin.sin_port = htons((u_short)*alport); |
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276 | if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0) |
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277 | return (s); |
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278 | if (errno != EADDRINUSE) { |
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279 | (void)close(s); |
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280 | return (-1); |
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281 | } |
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282 | #endif |
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283 | sin.sin_port = 0; |
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284 | if (bindresvport(s, &sin) == -1) { |
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285 | (void)close(s); |
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286 | return (-1); |
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287 | } |
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288 | *alport = (int)ntohs(sin.sin_port); |
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289 | return (s); |
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290 | } |
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291 | |
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292 | #ifndef __rtems__ |
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293 | int __check_rhosts_file = 1; |
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294 | char *__rcmd_errstr; |
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295 | |
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296 | int |
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297 | ruserok(rhost, superuser, ruser, luser) |
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298 | const char *rhost, *ruser, *luser; |
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299 | int superuser; |
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300 | { |
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301 | struct hostent *hp; |
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302 | u_long addr; |
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303 | char **ap; |
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304 | |
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305 | if ((hp = gethostbyname(rhost)) == NULL) |
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306 | return (-1); |
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307 | for (ap = hp->h_addr_list; *ap; ++ap) { |
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308 | bcopy(*ap, &addr, sizeof(addr)); |
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309 | if (iruserok(addr, superuser, ruser, luser) == 0) |
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310 | return (0); |
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311 | } |
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312 | return (-1); |
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313 | } |
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314 | |
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315 | /* |
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316 | * New .rhosts strategy: We are passed an ip address. We spin through |
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317 | * hosts.equiv and .rhosts looking for a match. When the .rhosts only |
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318 | * has ip addresses, we don't have to trust a nameserver. When it |
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319 | * contains hostnames, we spin through the list of addresses the nameserver |
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320 | * gives us and look for a match. |
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321 | * |
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322 | * Returns 0 if ok, -1 if not ok. |
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323 | */ |
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324 | int |
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325 | iruserok(raddr, superuser, ruser, luser) |
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326 | u_long raddr; |
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327 | int superuser; |
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328 | const char *ruser, *luser; |
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329 | { |
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330 | register char *cp; |
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331 | struct stat sbuf; |
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332 | struct passwd *pwd; |
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333 | FILE *hostf; |
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334 | uid_t uid; |
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335 | int first; |
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336 | char pbuf[MAXPATHLEN]; |
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337 | |
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338 | first = 1; |
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339 | hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r"); |
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340 | again: |
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341 | if (hostf) { |
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342 | if (__ivaliduser(hostf, raddr, luser, ruser) == 0) { |
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343 | (void)fclose(hostf); |
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344 | return (0); |
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345 | } |
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346 | (void)fclose(hostf); |
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347 | } |
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348 | if (first == 1 && (__check_rhosts_file || superuser)) { |
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349 | first = 0; |
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350 | if ((pwd = getpwnam(luser)) == NULL) |
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351 | return (-1); |
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352 | (void)strcpy(pbuf, pwd->pw_dir); |
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353 | (void)strcat(pbuf, "/.rhosts"); |
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354 | |
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355 | /* |
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356 | * Change effective uid while opening .rhosts. If root and |
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357 | * reading an NFS mounted file system, can't read files that |
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358 | * are protected read/write owner only. |
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359 | */ |
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360 | uid = geteuid(); |
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361 | (void)seteuid(pwd->pw_uid); |
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362 | hostf = fopen(pbuf, "r"); |
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363 | (void)seteuid(uid); |
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364 | |
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365 | if (hostf == NULL) |
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366 | return (-1); |
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367 | /* |
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368 | * If not a regular file, or is owned by someone other than |
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369 | * user or root or if writeable by anyone but the owner, quit. |
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370 | */ |
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371 | cp = NULL; |
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372 | if (lstat(pbuf, &sbuf) < 0) |
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373 | cp = ".rhosts lstat failed"; |
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374 | else if (!S_ISREG(sbuf.st_mode)) |
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375 | cp = ".rhosts not regular file"; |
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376 | else if (fstat(fileno(hostf), &sbuf) < 0) |
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377 | cp = ".rhosts fstat failed"; |
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378 | else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid) |
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379 | cp = "bad .rhosts owner"; |
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380 | else if (sbuf.st_mode & (S_IWGRP|S_IWOTH)) |
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381 | cp = ".rhosts writeable by other than owner"; |
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382 | /* If there were any problems, quit. */ |
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383 | if (cp) { |
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384 | __rcmd_errstr = cp; |
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385 | (void)fclose(hostf); |
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386 | return (-1); |
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387 | } |
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388 | goto again; |
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389 | } |
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390 | return (-1); |
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391 | } |
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392 | |
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393 | /* |
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394 | * XXX |
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395 | * Don't make static, used by lpd(8). |
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396 | * |
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397 | * Returns 0 if ok, -1 if not ok. |
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398 | */ |
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399 | int |
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400 | __ivaliduser(hostf, raddr, luser, ruser) |
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401 | FILE *hostf; |
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402 | u_long raddr; |
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403 | const char *luser, *ruser; |
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404 | { |
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405 | register char *user, *p; |
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406 | int ch; |
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407 | char buf[MAXHOSTNAMELEN + 128]; /* host + login */ |
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408 | char hname[MAXHOSTNAMELEN]; |
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409 | struct hostent *hp; |
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410 | /* Presumed guilty until proven innocent. */ |
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411 | int userok = 0, hostok = 0; |
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412 | #ifdef YP |
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413 | char *ypdomain; |
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414 | |
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415 | if (yp_get_default_domain(&ypdomain)) |
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416 | ypdomain = NULL; |
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417 | #else |
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418 | #define ypdomain NULL |
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419 | #endif |
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420 | /* We need to get the damn hostname back for netgroup matching. */ |
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421 | if ((hp = gethostbyaddr((char *)&raddr, sizeof(u_long), |
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422 | AF_INET)) == NULL) |
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423 | return (-1); |
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424 | strncpy(hname, hp->h_name, sizeof(hname)); |
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425 | hname[sizeof(hname) - 1] = '\0'; |
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426 | |
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427 | while (fgets(buf, sizeof(buf), hostf)) { |
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428 | p = buf; |
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429 | /* Skip lines that are too long. */ |
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430 | if (strchr(p, '\n') == NULL) { |
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431 | while ((ch = getc(hostf)) != '\n' && ch != EOF); |
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432 | continue; |
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433 | } |
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434 | if (*p == '\n' || *p == '#') { |
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435 | /* comment... */ |
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436 | continue; |
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437 | } |
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438 | while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') { |
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439 | *p = isupper(*p) ? tolower(*p) : *p; |
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440 | p++; |
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441 | } |
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442 | if (*p == ' ' || *p == '\t') { |
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443 | *p++ = '\0'; |
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444 | while (*p == ' ' || *p == '\t') |
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445 | p++; |
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446 | user = p; |
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447 | while (*p != '\n' && *p != ' ' && |
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448 | *p != '\t' && *p != '\0') |
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449 | p++; |
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450 | } else |
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451 | user = p; |
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452 | *p = '\0'; |
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453 | /* |
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454 | * Do +/- and +@/-@ checking. This looks really nasty, |
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455 | * but it matches SunOS's behavior so far as I can tell. |
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456 | */ |
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457 | switch(buf[0]) { |
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458 | case '+': |
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459 | if (!buf[1]) { /* '+' matches all hosts */ |
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460 | hostok = 1; |
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461 | break; |
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462 | } |
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463 | if (buf[1] == '@') /* match a host by netgroup */ |
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464 | hostok = innetgr((char *)&buf[2], |
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465 | (char *)&hname, NULL, ypdomain); |
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466 | else /* match a host by addr */ |
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467 | hostok = __icheckhost(raddr,(char *)&buf[1]); |
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468 | break; |
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469 | case '-': /* reject '-' hosts and all their users */ |
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470 | if (buf[1] == '@') { |
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471 | if (innetgr((char *)&buf[2], |
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472 | (char *)&hname, NULL, ypdomain)) |
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473 | return(-1); |
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474 | } else { |
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475 | if (__icheckhost(raddr,(char *)&buf[1])) |
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476 | return(-1); |
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477 | } |
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478 | break; |
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479 | default: /* if no '+' or '-', do a simple match */ |
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480 | hostok = __icheckhost(raddr, buf); |
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481 | break; |
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482 | } |
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483 | switch(*user) { |
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484 | case '+': |
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485 | if (!*(user+1)) { /* '+' matches all users */ |
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486 | userok = 1; |
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487 | break; |
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488 | } |
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489 | if (*(user+1) == '@') /* match a user by netgroup */ |
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490 | userok = innetgr(user+2, NULL, ruser, ypdomain); |
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491 | else /* match a user by direct specification */ |
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492 | userok = !(strcmp(ruser, user+1)); |
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493 | break; |
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494 | case '-': /* if we matched a hostname, */ |
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495 | if (hostok) { /* check for user field rejections */ |
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496 | if (!*(user+1)) |
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497 | return(-1); |
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498 | if (*(user+1) == '@') { |
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499 | if (innetgr(user+2, NULL, |
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500 | ruser, ypdomain)) |
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501 | return(-1); |
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502 | } else { |
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503 | if (!strcmp(ruser, user+1)) |
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504 | return(-1); |
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505 | } |
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506 | } |
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507 | break; |
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508 | default: /* no rejections: try to match the user */ |
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509 | if (hostok) |
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510 | userok = !(strcmp(ruser,*user ? user : luser)); |
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511 | break; |
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512 | } |
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513 | if (hostok && userok) |
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514 | return(0); |
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515 | } |
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516 | return (-1); |
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517 | } |
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518 | |
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519 | /* |
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520 | * Returns "true" if match, 0 if no match. |
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521 | */ |
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522 | static int |
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523 | __icheckhost(raddr, lhost) |
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524 | u_long raddr; |
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525 | register char *lhost; |
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526 | { |
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527 | register struct hostent *hp; |
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528 | register u_long laddr; |
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529 | register char **pp; |
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530 | |
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531 | /* Try for raw ip address first. */ |
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532 | if (isdigit(*lhost) && (long)(laddr = inet_addr(lhost)) != -1) |
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533 | return (raddr == laddr); |
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534 | |
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535 | /* Better be a hostname. */ |
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536 | if ((hp = gethostbyname(lhost)) == NULL) |
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537 | return (0); |
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538 | |
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539 | /* Spin through ip addresses. */ |
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540 | for (pp = hp->h_addr_list; *pp; ++pp) |
---|
541 | if (!bcmp(&raddr, *pp, sizeof(u_long))) |
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542 | return (1); |
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543 | |
---|
544 | /* No match. */ |
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545 | return (0); |
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546 | } |
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547 | #endif |
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