1 | /* This source code was modified by Martin Hedenfalk <mhe@stacken.kth.se> for
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2 | * use in Curl. His latest changes were done 2000-09-18.
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3 | *
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4 | * It has since been patched and modified a lot by Daniel Stenberg
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5 | * <daniel@haxx.se> to make it better applied to curl conditions, and to make
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6 | * it not use globals, pollute name space and more. This source code awaits a
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7 | * rewrite to work around the paragraph 2 in the BSD licenses as explained
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8 | * below.
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9 | *
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10 | * Copyright (c) 1998, 1999 Kungliga Tekniska Högskolan
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11 | * (Royal Institute of Technology, Stockholm, Sweden).
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12 | *
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13 | * Copyright (C) 2001 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
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14 | *
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15 | * All rights reserved.
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16 | *
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17 | * Redistribution and use in source and binary forms, with or without
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18 | * modification, are permitted provided that the following conditions
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19 | * are met:
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20 | *
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21 | * 1. Redistributions of source code must retain the above copyright
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22 | * notice, this list of conditions and the following disclaimer.
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23 | *
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24 | * 2. Redistributions in binary form must reproduce the above copyright
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25 | * notice, this list of conditions and the following disclaimer in the
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26 | * documentation and/or other materials provided with the distribution.
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27 | *
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28 | * 3. Neither the name of the Institute nor the names of its contributors
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29 | * may be used to endorse or promote products derived from this software
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30 | * without specific prior written permission.
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31 | *
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32 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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33 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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34 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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35 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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36 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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37 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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38 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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39 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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40 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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41 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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42 | * SUCH DAMAGE. */
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43 |
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44 | #include "curl_setup.h"
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45 |
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46 | #ifndef CURL_DISABLE_FTP
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47 | #ifdef HAVE_GSSAPI
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48 |
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49 | #ifdef HAVE_NETDB_H
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50 | #include <netdb.h>
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51 | #endif
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52 |
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53 | #ifdef HAVE_LIMITS_H
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54 | #include <limits.h>
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55 | #endif
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56 |
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57 | #include "urldata.h"
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58 | #include "curl_base64.h"
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59 | #include "curl_memory.h"
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60 | #include "curl_sec.h"
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61 | #include "ftp.h"
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62 | #include "sendf.h"
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63 | #include "rawstr.h"
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64 | #include "warnless.h"
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65 |
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66 | /* The last #include file should be: */
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67 | #include "memdebug.h"
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68 |
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69 | static const struct {
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70 | enum protection_level level;
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71 | const char *name;
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72 | } level_names[] = {
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73 | { PROT_CLEAR, "clear" },
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74 | { PROT_SAFE, "safe" },
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75 | { PROT_CONFIDENTIAL, "confidential" },
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76 | { PROT_PRIVATE, "private" }
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77 | };
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78 |
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79 | static enum protection_level
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80 | name_to_level(const char *name)
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81 | {
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82 | int i;
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83 | for(i = 0; i < (int)sizeof(level_names)/(int)sizeof(level_names[0]); i++)
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84 | if(checkprefix(name, level_names[i].name))
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85 | return level_names[i].level;
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86 | return PROT_NONE;
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87 | }
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88 |
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89 | /* Convert a protocol |level| to its char representation.
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90 | We take an int to catch programming mistakes. */
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91 | static char level_to_char(int level) {
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92 | switch(level) {
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93 | case PROT_CLEAR:
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94 | return 'C';
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95 | case PROT_SAFE:
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96 | return 'S';
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97 | case PROT_CONFIDENTIAL:
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98 | return 'E';
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99 | case PROT_PRIVATE:
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100 | return 'P';
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101 | case PROT_CMD:
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102 | /* Fall through */
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103 | default:
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104 | /* Those 2 cases should not be reached! */
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105 | break;
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106 | }
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107 | DEBUGASSERT(0);
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108 | /* Default to the most secure alternative. */
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109 | return 'P';
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110 | }
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111 |
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112 | /* Send an FTP command defined by |message| and the optional arguments. The
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113 | function returns the ftp_code. If an error occurs, -1 is returned. */
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114 | static int ftp_send_command(struct connectdata *conn, const char *message, ...)
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115 | {
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116 | int ftp_code;
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117 | ssize_t nread=0;
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118 | va_list args;
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119 | char print_buffer[50];
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120 |
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121 | va_start(args, message);
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122 | vsnprintf(print_buffer, sizeof(print_buffer), message, args);
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123 | va_end(args);
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124 |
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125 | if(Curl_ftpsendf(conn, print_buffer)) {
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126 | ftp_code = -1;
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127 | }
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128 | else {
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129 | if(Curl_GetFTPResponse(&nread, conn, &ftp_code))
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130 | ftp_code = -1;
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131 | }
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132 |
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133 | (void)nread; /* Unused */
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134 | return ftp_code;
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135 | }
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136 |
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137 | /* Read |len| from the socket |fd| and store it in |to|. Return a CURLcode
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138 | saying whether an error occurred or CURLE_OK if |len| was read. */
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139 | static CURLcode
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140 | socket_read(curl_socket_t fd, void *to, size_t len)
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141 | {
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142 | char *to_p = to;
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143 | CURLcode result;
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144 | ssize_t nread;
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145 |
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146 | while(len > 0) {
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147 | result = Curl_read_plain(fd, to_p, len, &nread);
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148 | if(!result) {
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149 | len -= nread;
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150 | to_p += nread;
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151 | }
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152 | else {
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153 | /* FIXME: We are doing a busy wait */
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154 | if(result == CURLE_AGAIN)
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155 | continue;
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156 | return result;
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157 | }
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158 | }
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159 | return CURLE_OK;
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160 | }
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161 |
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162 |
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163 | /* Write |len| bytes from the buffer |to| to the socket |fd|. Return a
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164 | CURLcode saying whether an error occurred or CURLE_OK if |len| was
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165 | written. */
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166 | static CURLcode
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167 | socket_write(struct connectdata *conn, curl_socket_t fd, const void *to,
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168 | size_t len)
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169 | {
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170 | const char *to_p = to;
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171 | CURLcode result;
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172 | ssize_t written;
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173 |
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174 | while(len > 0) {
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175 | result = Curl_write_plain(conn, fd, to_p, len, &written);
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176 | if(!result) {
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177 | len -= written;
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178 | to_p += written;
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179 | }
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180 | else {
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181 | /* FIXME: We are doing a busy wait */
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182 | if(result == CURLE_AGAIN)
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183 | continue;
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184 | return result;
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185 | }
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186 | }
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187 | return CURLE_OK;
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188 | }
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189 |
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190 | static CURLcode read_data(struct connectdata *conn,
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191 | curl_socket_t fd,
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192 | struct krb5buffer *buf)
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193 | {
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194 | int len;
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195 | void* tmp;
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196 | CURLcode result;
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197 |
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198 | result = socket_read(fd, &len, sizeof(len));
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199 | if(result)
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200 | return result;
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201 |
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202 | len = ntohl(len);
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203 | tmp = realloc(buf->data, len);
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204 | if(tmp == NULL)
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205 | return CURLE_OUT_OF_MEMORY;
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206 |
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207 | buf->data = tmp;
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208 | result = socket_read(fd, buf->data, len);
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209 | if(result)
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210 | return result;
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211 | buf->size = conn->mech->decode(conn->app_data, buf->data, len,
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212 | conn->data_prot, conn);
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213 | buf->index = 0;
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214 | return CURLE_OK;
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215 | }
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216 |
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217 | static size_t
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218 | buffer_read(struct krb5buffer *buf, void *data, size_t len)
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219 | {
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220 | if(buf->size - buf->index < len)
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221 | len = buf->size - buf->index;
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222 | memcpy(data, (char*)buf->data + buf->index, len);
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223 | buf->index += len;
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224 | return len;
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225 | }
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226 |
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227 | /* Matches Curl_recv signature */
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228 | static ssize_t sec_recv(struct connectdata *conn, int sockindex,
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229 | char *buffer, size_t len, CURLcode *err)
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230 | {
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231 | size_t bytes_read;
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232 | size_t total_read = 0;
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233 | curl_socket_t fd = conn->sock[sockindex];
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234 |
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235 | *err = CURLE_OK;
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236 |
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237 | /* Handle clear text response. */
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238 | if(conn->sec_complete == 0 || conn->data_prot == PROT_CLEAR)
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239 | return read(fd, buffer, len);
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240 |
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241 | if(conn->in_buffer.eof_flag) {
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242 | conn->in_buffer.eof_flag = 0;
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243 | return 0;
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244 | }
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245 |
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246 | bytes_read = buffer_read(&conn->in_buffer, buffer, len);
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247 | len -= bytes_read;
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248 | total_read += bytes_read;
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249 | buffer += bytes_read;
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250 |
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251 | while(len > 0) {
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252 | if(read_data(conn, fd, &conn->in_buffer))
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253 | return -1;
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254 | if(conn->in_buffer.size == 0) {
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255 | if(bytes_read > 0)
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256 | conn->in_buffer.eof_flag = 1;
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257 | return bytes_read;
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258 | }
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259 | bytes_read = buffer_read(&conn->in_buffer, buffer, len);
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260 | len -= bytes_read;
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261 | total_read += bytes_read;
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262 | buffer += bytes_read;
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263 | }
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264 | /* FIXME: Check for overflow */
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265 | return total_read;
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266 | }
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267 |
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268 | /* Send |length| bytes from |from| to the |fd| socket taking care of encoding
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269 | and negociating with the server. |from| can be NULL. */
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270 | /* FIXME: We don't check for errors nor report any! */
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271 | static void do_sec_send(struct connectdata *conn, curl_socket_t fd,
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272 | const char *from, int length)
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273 | {
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274 | int bytes, htonl_bytes; /* 32-bit integers for htonl */
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275 | char *buffer = NULL;
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276 | char *cmd_buffer;
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277 | size_t cmd_size = 0;
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278 | CURLcode error;
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279 | enum protection_level prot_level = conn->data_prot;
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280 | bool iscmd = (prot_level == PROT_CMD)?TRUE:FALSE;
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281 |
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282 | DEBUGASSERT(prot_level > PROT_NONE && prot_level < PROT_LAST);
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283 |
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284 | if(iscmd) {
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285 | if(!strncmp(from, "PASS ", 5) || !strncmp(from, "ACCT ", 5))
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286 | prot_level = PROT_PRIVATE;
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287 | else
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288 | prot_level = conn->command_prot;
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289 | }
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290 | bytes = conn->mech->encode(conn->app_data, from, length, prot_level,
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291 | (void**)&buffer);
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292 | if(!buffer || bytes <= 0)
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293 | return; /* error */
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294 |
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295 | if(iscmd) {
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296 | error = Curl_base64_encode(conn->data, buffer, curlx_sitouz(bytes),
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297 | &cmd_buffer, &cmd_size);
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298 | if(error) {
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299 | free(buffer);
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300 | return; /* error */
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301 | }
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302 | if(cmd_size > 0) {
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303 | static const char *enc = "ENC ";
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304 | static const char *mic = "MIC ";
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305 | if(prot_level == PROT_PRIVATE)
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306 | socket_write(conn, fd, enc, 4);
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307 | else
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308 | socket_write(conn, fd, mic, 4);
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309 |
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310 | socket_write(conn, fd, cmd_buffer, cmd_size);
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311 | socket_write(conn, fd, "\r\n", 2);
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312 | infof(conn->data, "Send: %s%s\n", prot_level == PROT_PRIVATE?enc:mic,
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313 | cmd_buffer);
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314 | free(cmd_buffer);
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315 | }
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316 | }
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317 | else {
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318 | htonl_bytes = htonl(bytes);
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319 | socket_write(conn, fd, &htonl_bytes, sizeof(htonl_bytes));
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320 | socket_write(conn, fd, buffer, curlx_sitouz(bytes));
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321 | }
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322 | free(buffer);
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323 | }
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324 |
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325 | static ssize_t sec_write(struct connectdata *conn, curl_socket_t fd,
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326 | const char *buffer, size_t length)
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327 | {
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328 | ssize_t tx = 0, len = conn->buffer_size;
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329 |
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330 | len -= conn->mech->overhead(conn->app_data, conn->data_prot,
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331 | curlx_sztosi(len));
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332 | if(len <= 0)
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333 | len = length;
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334 | while(length) {
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335 | if(length < (size_t)len)
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336 | len = length;
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337 |
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338 | do_sec_send(conn, fd, buffer, curlx_sztosi(len));
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339 | length -= len;
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340 | buffer += len;
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341 | tx += len;
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342 | }
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343 | return tx;
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344 | }
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345 |
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346 | /* Matches Curl_send signature */
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347 | static ssize_t sec_send(struct connectdata *conn, int sockindex,
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348 | const void *buffer, size_t len, CURLcode *err)
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349 | {
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350 | curl_socket_t fd = conn->sock[sockindex];
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351 | *err = CURLE_OK;
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352 | return sec_write(conn, fd, buffer, len);
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353 | }
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354 |
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355 | int Curl_sec_read_msg(struct connectdata *conn, char *buffer,
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356 | enum protection_level level)
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357 | {
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358 | /* decoded_len should be size_t or ssize_t but conn->mech->decode returns an
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359 | int */
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360 | int decoded_len;
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361 | char *buf;
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362 | int ret_code = 0;
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363 | size_t decoded_sz = 0;
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364 | CURLcode error;
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365 |
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366 | DEBUGASSERT(level > PROT_NONE && level < PROT_LAST);
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367 |
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368 | error = Curl_base64_decode(buffer + 4, (unsigned char **)&buf, &decoded_sz);
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369 | if(error || decoded_sz == 0)
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370 | return -1;
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371 |
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372 | if(decoded_sz > (size_t)INT_MAX) {
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373 | free(buf);
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374 | return -1;
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375 | }
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376 | decoded_len = curlx_uztosi(decoded_sz);
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377 |
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378 | decoded_len = conn->mech->decode(conn->app_data, buf, decoded_len,
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379 | level, conn);
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380 | if(decoded_len <= 0) {
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381 | free(buf);
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382 | return -1;
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383 | }
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384 |
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385 | if(conn->data->set.verbose) {
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386 | buf[decoded_len] = '\n';
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387 | Curl_debug(conn->data, CURLINFO_HEADER_IN, buf, decoded_len + 1, conn);
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388 | }
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389 |
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390 | buf[decoded_len] = '\0';
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391 | if(decoded_len <= 3)
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392 | /* suspiciously short */
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393 | return 0;
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394 |
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395 | if(buf[3] != '-')
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396 | /* safe to ignore return code */
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397 | (void)sscanf(buf, "%d", &ret_code);
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398 |
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399 | if(buf[decoded_len - 1] == '\n')
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400 | buf[decoded_len - 1] = '\0';
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401 | /* FIXME: Is |buffer| length always greater than |decoded_len|? */
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402 | strcpy(buffer, buf);
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403 | free(buf);
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404 | return ret_code;
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405 | }
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406 |
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407 | /* FIXME: The error code returned here is never checked. */
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408 | static int sec_set_protection_level(struct connectdata *conn)
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409 | {
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410 | int code;
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411 | char* pbsz;
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412 | static unsigned int buffer_size = 1 << 20; /* 1048576 */
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413 | enum protection_level level = conn->request_data_prot;
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414 |
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415 | DEBUGASSERT(level > PROT_NONE && level < PROT_LAST);
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416 |
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417 | if(!conn->sec_complete) {
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418 | infof(conn->data, "Trying to change the protection level after the"
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419 | "completion of the data exchange.\n");
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420 | return -1;
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421 | }
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422 |
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423 | /* Bail out if we try to set up the same level */
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424 | if(conn->data_prot == level)
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425 | return 0;
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426 |
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427 | if(level) {
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428 | code = ftp_send_command(conn, "PBSZ %u", buffer_size);
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429 | if(code < 0)
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430 | return -1;
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431 |
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432 | if(code/100 != 2) {
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433 | failf(conn->data, "Failed to set the protection's buffer size.");
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434 | return -1;
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435 | }
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436 | conn->buffer_size = buffer_size;
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437 |
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438 | pbsz = strstr(conn->data->state.buffer, "PBSZ=");
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439 | if(pbsz) {
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440 | /* ignore return code, use default value if it fails */
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441 | (void)sscanf(pbsz, "PBSZ=%u", &buffer_size);
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442 | if(buffer_size < conn->buffer_size)
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443 | conn->buffer_size = buffer_size;
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444 | }
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445 | }
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446 |
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447 | /* Now try to negiociate the protection level. */
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448 | code = ftp_send_command(conn, "PROT %c", level_to_char(level));
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449 |
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450 | if(code < 0)
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451 | return -1;
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452 |
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453 | if(code/100 != 2) {
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454 | failf(conn->data, "Failed to set the protection level.");
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455 | return -1;
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456 | }
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457 |
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458 | conn->data_prot = level;
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459 | if(level == PROT_PRIVATE)
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460 | conn->command_prot = level;
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461 |
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462 | return 0;
|
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463 | }
|
---|
464 |
|
---|
465 | int
|
---|
466 | Curl_sec_request_prot(struct connectdata *conn, const char *level)
|
---|
467 | {
|
---|
468 | enum protection_level l = name_to_level(level);
|
---|
469 | if(l == PROT_NONE)
|
---|
470 | return -1;
|
---|
471 | DEBUGASSERT(l > PROT_NONE && l < PROT_LAST);
|
---|
472 | conn->request_data_prot = l;
|
---|
473 | return 0;
|
---|
474 | }
|
---|
475 |
|
---|
476 | static CURLcode choose_mech(struct connectdata *conn)
|
---|
477 | {
|
---|
478 | int ret;
|
---|
479 | struct SessionHandle *data = conn->data;
|
---|
480 | void *tmp_allocation;
|
---|
481 | const struct Curl_sec_client_mech *mech = &Curl_krb5_client_mech;
|
---|
482 |
|
---|
483 | tmp_allocation = realloc(conn->app_data, mech->size);
|
---|
484 | if(tmp_allocation == NULL) {
|
---|
485 | failf(data, "Failed realloc of size %u", mech->size);
|
---|
486 | mech = NULL;
|
---|
487 | return CURLE_OUT_OF_MEMORY;
|
---|
488 | }
|
---|
489 | conn->app_data = tmp_allocation;
|
---|
490 |
|
---|
491 | if(mech->init) {
|
---|
492 | ret = mech->init(conn->app_data);
|
---|
493 | if(ret) {
|
---|
494 | infof(data, "Failed initialization for %s. Skipping it.\n",
|
---|
495 | mech->name);
|
---|
496 | return CURLE_FAILED_INIT;
|
---|
497 | }
|
---|
498 | }
|
---|
499 |
|
---|
500 | infof(data, "Trying mechanism %s...\n", mech->name);
|
---|
501 | ret = ftp_send_command(conn, "AUTH %s", mech->name);
|
---|
502 | if(ret < 0)
|
---|
503 | /* FIXME: This error is too generic but it is OK for now. */
|
---|
504 | return CURLE_COULDNT_CONNECT;
|
---|
505 |
|
---|
506 | if(ret/100 != 3) {
|
---|
507 | switch(ret) {
|
---|
508 | case 504:
|
---|
509 | infof(data, "Mechanism %s is not supported by the server (server "
|
---|
510 | "returned ftp code: 504).\n", mech->name);
|
---|
511 | break;
|
---|
512 | case 534:
|
---|
513 | infof(data, "Mechanism %s was rejected by the server (server returned "
|
---|
514 | "ftp code: 534).\n", mech->name);
|
---|
515 | break;
|
---|
516 | default:
|
---|
517 | if(ret/100 == 5) {
|
---|
518 | infof(data, "server does not support the security extensions\n");
|
---|
519 | return CURLE_USE_SSL_FAILED;
|
---|
520 | }
|
---|
521 | break;
|
---|
522 | }
|
---|
523 | return CURLE_LOGIN_DENIED;
|
---|
524 | }
|
---|
525 |
|
---|
526 | /* Authenticate */
|
---|
527 | ret = mech->auth(conn->app_data, conn);
|
---|
528 |
|
---|
529 | if(ret != AUTH_CONTINUE) {
|
---|
530 | if(ret != AUTH_OK) {
|
---|
531 | /* Mechanism has dumped the error to stderr, don't error here. */
|
---|
532 | return -1;
|
---|
533 | }
|
---|
534 | DEBUGASSERT(ret == AUTH_OK);
|
---|
535 |
|
---|
536 | conn->mech = mech;
|
---|
537 | conn->sec_complete = 1;
|
---|
538 | conn->recv[FIRSTSOCKET] = sec_recv;
|
---|
539 | conn->send[FIRSTSOCKET] = sec_send;
|
---|
540 | conn->recv[SECONDARYSOCKET] = sec_recv;
|
---|
541 | conn->send[SECONDARYSOCKET] = sec_send;
|
---|
542 | conn->command_prot = PROT_SAFE;
|
---|
543 | /* Set the requested protection level */
|
---|
544 | /* BLOCKING */
|
---|
545 | (void)sec_set_protection_level(conn);
|
---|
546 | }
|
---|
547 |
|
---|
548 | return CURLE_OK;
|
---|
549 | }
|
---|
550 |
|
---|
551 | CURLcode
|
---|
552 | Curl_sec_login(struct connectdata *conn)
|
---|
553 | {
|
---|
554 | return choose_mech(conn);
|
---|
555 | }
|
---|
556 |
|
---|
557 |
|
---|
558 | void
|
---|
559 | Curl_sec_end(struct connectdata *conn)
|
---|
560 | {
|
---|
561 | if(conn->mech != NULL && conn->mech->end)
|
---|
562 | conn->mech->end(conn->app_data);
|
---|
563 | free(conn->app_data);
|
---|
564 | conn->app_data = NULL;
|
---|
565 | if(conn->in_buffer.data) {
|
---|
566 | free(conn->in_buffer.data);
|
---|
567 | conn->in_buffer.data = NULL;
|
---|
568 | conn->in_buffer.size = 0;
|
---|
569 | conn->in_buffer.index = 0;
|
---|
570 | /* FIXME: Is this really needed? */
|
---|
571 | conn->in_buffer.eof_flag = 0;
|
---|
572 | }
|
---|
573 | conn->sec_complete = 0;
|
---|
574 | conn->data_prot = PROT_CLEAR;
|
---|
575 | conn->mech = NULL;
|
---|
576 | }
|
---|
577 |
|
---|
578 | #endif /* HAVE_GSSAPI */
|
---|
579 |
|
---|
580 | #endif /* CURL_DISABLE_FTP */
|
---|