1 | /** |
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2 | * Copyright 2004-2005 Paul Querna |
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3 | * Copyright 2008 Nikos Mavrogiannopoulos |
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4 | * Copyright 2011 Dash Shendy |
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5 | * |
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6 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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7 | * you may not use this file except in compliance with the License. |
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8 | * You may obtain a copy of the License at |
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9 | * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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11 | * |
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12 | * Unless required by applicable law or agreed to in writing, software |
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13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 | * See the License for the specific language governing permissions and |
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16 | * limitations under the License. |
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17 | * |
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18 | */ |
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19 | |
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20 | #include "mod_gnutls.h" |
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21 | |
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22 | /** |
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23 | * Describe how the GnuTLS Filter system works here |
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24 | * - Basicly the same as what mod_ssl does with OpenSSL. |
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25 | * |
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26 | */ |
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27 | |
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28 | #define HTTP_ON_HTTPS_PORT \ |
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29 | "GET /" CRLF |
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30 | |
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31 | #define HTTP_ON_HTTPS_PORT_BUCKET(alloc) \ |
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32 | apr_bucket_immortal_create(HTTP_ON_HTTPS_PORT, \ |
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33 | sizeof(HTTP_ON_HTTPS_PORT) - 1, \ |
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34 | alloc) |
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35 | |
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36 | static apr_status_t gnutls_io_filter_error(ap_filter_t * f, |
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37 | apr_bucket_brigade * bb, |
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38 | apr_status_t status) { |
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39 | mgs_handle_t *ctxt = (mgs_handle_t *) f->ctx; |
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40 | apr_bucket *bucket; |
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41 | |
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42 | switch (status) { |
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43 | case HTTP_BAD_REQUEST: |
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44 | /* log the situation */ |
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45 | ap_log_error(APLOG_MARK, APLOG_INFO, 0, |
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46 | f->c->base_server, |
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47 | "GnuTLS handshake failed: HTTP spoken on HTTPS port; " |
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48 | "trying to send HTML error page"); |
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49 | |
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50 | ctxt->status = -1; |
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51 | ctxt->non_ssl_request = 1; |
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52 | |
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53 | /* fake the request line */ |
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54 | bucket = HTTP_ON_HTTPS_PORT_BUCKET(f->c->bucket_alloc); |
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55 | break; |
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56 | |
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57 | default: |
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58 | return status; |
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59 | } |
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60 | |
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61 | APR_BRIGADE_INSERT_TAIL(bb, bucket); |
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62 | bucket = apr_bucket_eos_create(f->c->bucket_alloc); |
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63 | APR_BRIGADE_INSERT_TAIL(bb, bucket); |
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64 | |
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65 | return APR_SUCCESS; |
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66 | } |
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67 | |
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68 | static int char_buffer_read(mgs_char_buffer_t * buffer, char *in, int inl) { |
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69 | if (!buffer->length) { |
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70 | return 0; |
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71 | } |
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72 | |
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73 | if (buffer->length > inl) { |
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74 | /* we have have enough to fill the caller's buffer */ |
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75 | memmove(in, buffer->value, inl); |
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76 | buffer->value += inl; |
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77 | buffer->length -= inl; |
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78 | } else { |
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79 | /* swallow remainder of the buffer */ |
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80 | memmove(in, buffer->value, buffer->length); |
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81 | inl = buffer->length; |
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82 | buffer->value = NULL; |
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83 | buffer->length = 0; |
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84 | } |
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85 | |
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86 | return inl; |
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87 | } |
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88 | |
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89 | static int char_buffer_write(mgs_char_buffer_t * buffer, char *in, int inl) { |
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90 | buffer->value = in; |
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91 | buffer->length = inl; |
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92 | return inl; |
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93 | } |
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94 | |
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95 | /** |
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96 | * From mod_ssl / ssl_engine_io.c |
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97 | * This function will read from a brigade and discard the read buckets as it |
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98 | * proceeds. It will read at most *len bytes. |
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99 | */ |
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100 | static apr_status_t brigade_consume(apr_bucket_brigade * bb, |
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101 | apr_read_type_e block, |
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102 | char *c, apr_size_t * len) { |
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103 | apr_size_t actual = 0; |
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104 | apr_status_t status = APR_SUCCESS; |
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105 | |
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106 | while (!APR_BRIGADE_EMPTY(bb)) { |
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107 | apr_bucket *b = APR_BRIGADE_FIRST(bb); |
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108 | const char *str; |
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109 | apr_size_t str_len; |
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110 | apr_size_t consume; |
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111 | |
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112 | /* Justin points out this is an http-ism that might |
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113 | * not fit if brigade_consume is added to APR. Perhaps |
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114 | * apr_bucket_read(eos_bucket) should return APR_EOF? |
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115 | * Then this becomes mainline instead of a one-off. |
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116 | */ |
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117 | if (APR_BUCKET_IS_EOS(b)) { |
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118 | status = APR_EOF; |
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119 | break; |
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120 | } |
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121 | |
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122 | /* The reason I'm not offering brigade_consume yet |
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123 | * across to apr-util is that the following call |
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124 | * illustrates how borked that API really is. For |
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125 | * this sort of case (caller provided buffer) it |
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126 | * would be much more trivial for apr_bucket_consume |
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127 | * to do all the work that follows, based on the |
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128 | * particular characteristics of the bucket we are |
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129 | * consuming here. |
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130 | */ |
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131 | status = apr_bucket_read(b, &str, &str_len, block); |
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132 | |
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133 | if (status != APR_SUCCESS) { |
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134 | if (APR_STATUS_IS_EOF(status)) { |
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135 | /* This stream bucket was consumed */ |
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136 | apr_bucket_delete(b); |
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137 | continue; |
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138 | } |
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139 | break; |
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140 | } |
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141 | |
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142 | if (str_len > 0) { |
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143 | /* Do not block once some data has been consumed */ |
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144 | block = APR_NONBLOCK_READ; |
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145 | |
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146 | /* Assure we don't overflow. */ |
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147 | consume = |
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148 | (str_len + actual > |
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149 | *len) ? *len - actual : str_len; |
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150 | |
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151 | memcpy(c, str, consume); |
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152 | |
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153 | c += consume; |
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154 | actual += consume; |
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155 | |
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156 | if (consume >= b->length) { |
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157 | /* This physical bucket was consumed */ |
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158 | apr_bucket_delete(b); |
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159 | } else { |
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160 | /* Only part of this physical bucket was consumed */ |
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161 | b->start += consume; |
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162 | b->length -= consume; |
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163 | } |
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164 | } else if (b->length == 0) { |
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165 | apr_bucket_delete(b); |
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166 | } |
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167 | |
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168 | /* This could probably be actual == *len, but be safe from stray |
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169 | * photons. */ |
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170 | if (actual >= *len) { |
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171 | break; |
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172 | } |
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173 | } |
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174 | |
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175 | *len = actual; |
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176 | return status; |
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177 | } |
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178 | |
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179 | static apr_status_t gnutls_io_input_read(mgs_handle_t * ctxt, |
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180 | char *buf, apr_size_t * len) { |
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181 | apr_size_t wanted = *len; |
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182 | apr_size_t bytes = 0; |
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183 | int rc; |
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184 | |
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185 | *len = 0; |
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186 | |
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187 | /* If we have something leftover from last time, try that first. */ |
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188 | if ((bytes = char_buffer_read(&ctxt->input_cbuf, buf, wanted))) { |
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189 | *len = bytes; |
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190 | if (ctxt->input_mode == AP_MODE_SPECULATIVE) { |
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191 | /* We want to rollback this read. */ |
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192 | if (ctxt->input_cbuf.length > 0) { |
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193 | ctxt->input_cbuf.value -= bytes; |
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194 | ctxt->input_cbuf.length += bytes; |
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195 | } else { |
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196 | char_buffer_write(&ctxt->input_cbuf, buf, |
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197 | (int) bytes); |
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198 | } |
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199 | return APR_SUCCESS; |
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200 | } |
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201 | /* This could probably be *len == wanted, but be safe from stray |
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202 | * photons. |
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203 | */ |
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204 | if (*len >= wanted) { |
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205 | return APR_SUCCESS; |
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206 | } |
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207 | if (ctxt->input_mode == AP_MODE_GETLINE) { |
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208 | if (memchr(buf, APR_ASCII_LF, *len)) { |
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209 | return APR_SUCCESS; |
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210 | } |
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211 | } else { |
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212 | /* Down to a nonblock pattern as we have some data already |
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213 | */ |
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214 | ctxt->input_block = APR_NONBLOCK_READ; |
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215 | } |
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216 | } |
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217 | |
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218 | if (ctxt->session == NULL) { |
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219 | return APR_EGENERAL; |
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220 | } |
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221 | |
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222 | while (1) { |
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223 | |
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224 | rc = gnutls_record_recv(ctxt->session, buf + bytes, |
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225 | wanted - bytes); |
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226 | |
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227 | if (rc > 0) { |
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228 | *len += rc; |
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229 | if (ctxt->input_mode == AP_MODE_SPECULATIVE) { |
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230 | /* We want to rollback this read. */ |
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231 | char_buffer_write(&ctxt->input_cbuf, buf, |
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232 | rc); |
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233 | } |
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234 | return ctxt->input_rc; |
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235 | } else if (rc == 0) { |
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236 | /* If EAGAIN, we will loop given a blocking read, |
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237 | * otherwise consider ourselves at EOF. |
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238 | */ |
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239 | if (APR_STATUS_IS_EAGAIN(ctxt->input_rc) |
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240 | || APR_STATUS_IS_EINTR(ctxt->input_rc)) { |
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241 | /* Already read something, return APR_SUCCESS instead. |
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242 | * On win32 in particular, but perhaps on other kernels, |
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243 | * a blocking call isn't 'always' blocking. |
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244 | */ |
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245 | if (*len > 0) { |
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246 | ctxt->input_rc = APR_SUCCESS; |
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247 | break; |
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248 | } |
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249 | if (ctxt->input_block == APR_NONBLOCK_READ) { |
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250 | break; |
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251 | } |
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252 | } else { |
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253 | if (*len > 0) { |
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254 | ctxt->input_rc = APR_SUCCESS; |
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255 | } else { |
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256 | ctxt->input_rc = APR_EOF; |
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257 | } |
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258 | break; |
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259 | } |
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260 | } else { /* (rc < 0) */ |
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261 | |
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262 | if (rc == GNUTLS_E_REHANDSHAKE) { |
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263 | /* A client has asked for a new Hankshake. Currently, we don't do it */ |
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264 | ap_log_error(APLOG_MARK, APLOG_INFO, |
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265 | ctxt->input_rc, |
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266 | ctxt->c->base_server, |
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267 | "GnuTLS: Error reading data. Client Requested a New Handshake." |
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268 | " (%d) '%s'", rc, |
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269 | gnutls_strerror(rc)); |
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270 | } else if (rc == GNUTLS_E_WARNING_ALERT_RECEIVED) { |
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271 | rc = gnutls_alert_get(ctxt->session); |
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272 | ap_log_error(APLOG_MARK, APLOG_INFO, |
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273 | ctxt->input_rc, |
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274 | ctxt->c->base_server, |
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275 | "GnuTLS: Warning Alert From Client: " |
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276 | " (%d) '%s'", rc, |
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277 | gnutls_alert_get_name(rc)); |
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278 | } else if (rc == GNUTLS_E_FATAL_ALERT_RECEIVED) { |
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279 | rc = gnutls_alert_get(ctxt->session); |
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280 | ap_log_error(APLOG_MARK, APLOG_INFO, |
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281 | ctxt->input_rc, |
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282 | ctxt->c->base_server, |
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283 | "GnuTLS: Fatal Alert From Client: " |
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284 | "(%d) '%s'", rc, |
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285 | gnutls_alert_get_name(rc)); |
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286 | ctxt->input_rc = APR_EGENERAL; |
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287 | break; |
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288 | } else { |
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289 | /* Some Other Error. Report it. Die. */ |
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290 | if (gnutls_error_is_fatal(rc)) { |
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291 | ap_log_error(APLOG_MARK, |
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292 | APLOG_INFO, |
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293 | ctxt->input_rc, |
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294 | ctxt->c->base_server, |
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295 | "GnuTLS: Error reading data. (%d) '%s'", |
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296 | rc, |
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297 | gnutls_strerror(rc)); |
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298 | } else if (*len > 0) { |
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299 | ctxt->input_rc = APR_SUCCESS; |
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300 | break; |
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301 | } |
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302 | } |
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303 | |
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304 | if (ctxt->input_rc == APR_SUCCESS) { |
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305 | ctxt->input_rc = APR_EGENERAL; |
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306 | } |
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307 | break; |
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308 | } |
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309 | } |
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310 | return ctxt->input_rc; |
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311 | } |
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312 | |
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313 | static apr_status_t gnutls_io_input_getline(mgs_handle_t * ctxt, |
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314 | char *buf, apr_size_t * len) { |
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315 | const char *pos = NULL; |
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316 | apr_status_t status; |
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317 | apr_size_t tmplen = *len, buflen = *len, offset = 0; |
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318 | |
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319 | *len = 0; |
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320 | |
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321 | while (tmplen > 0) { |
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322 | status = gnutls_io_input_read(ctxt, buf + offset, &tmplen); |
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323 | |
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324 | if (status != APR_SUCCESS) { |
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325 | return status; |
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326 | } |
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327 | |
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328 | *len += tmplen; |
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329 | |
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330 | if ((pos = memchr(buf, APR_ASCII_LF, *len))) { |
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331 | break; |
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332 | } |
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333 | |
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334 | offset += tmplen; |
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335 | tmplen = buflen - offset; |
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336 | } |
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337 | |
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338 | if (pos) { |
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339 | char *value; |
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340 | int length; |
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341 | apr_size_t bytes = pos - buf; |
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342 | |
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343 | bytes += 1; |
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344 | value = buf + bytes; |
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345 | length = *len - bytes; |
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346 | |
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347 | char_buffer_write(&ctxt->input_cbuf, value, length); |
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348 | |
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349 | *len = bytes; |
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350 | } |
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351 | |
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352 | return APR_SUCCESS; |
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353 | } |
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354 | |
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355 | #define HANDSHAKE_MAX_TRIES 1024 |
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356 | |
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357 | static int gnutls_do_handshake(mgs_handle_t * ctxt) { |
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358 | int ret; |
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359 | int errcode; |
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360 | int maxtries = HANDSHAKE_MAX_TRIES; |
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361 | |
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362 | if (ctxt->status != 0 || ctxt->session == NULL) { |
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363 | return -1; |
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364 | } |
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365 | |
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366 | tryagain: |
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367 | do { |
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368 | ret = gnutls_handshake(ctxt->session); |
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369 | maxtries--; |
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370 | } while ((ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN) |
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371 | && maxtries > 0); |
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372 | |
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373 | if (maxtries < 1) { |
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374 | ctxt->status = -1; |
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375 | #if USING_2_1_RECENT |
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376 | ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, ctxt->c, |
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377 | "GnuTLS: Handshake Failed. Hit Maximum Attempts"); |
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378 | #else |
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379 | ap_log_error(APLOG_MARK, APLOG_ERR, 0, |
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380 | ctxt->c->base_server, |
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381 | "GnuTLS: Handshake Failed. Hit Maximum Attempts"); |
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382 | #endif |
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383 | if (ctxt->session) { |
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384 | gnutls_alert_send(ctxt->session, GNUTLS_AL_FATAL, |
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385 | gnutls_error_to_alert |
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386 | (GNUTLS_E_INTERNAL_ERROR, NULL)); |
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387 | gnutls_deinit(ctxt->session); |
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388 | } |
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389 | ctxt->session = NULL; |
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390 | return -1; |
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391 | } |
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392 | |
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393 | if (ret < 0) { |
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394 | if (ret == GNUTLS_E_WARNING_ALERT_RECEIVED |
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395 | || ret == GNUTLS_E_FATAL_ALERT_RECEIVED) { |
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396 | errcode = gnutls_alert_get(ctxt->session); |
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397 | ap_log_error(APLOG_MARK, APLOG_INFO, 0, |
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398 | ctxt->c->base_server, |
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399 | "GnuTLS: Hanshake Alert (%d) '%s'.", |
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400 | errcode, |
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401 | gnutls_alert_get_name(errcode)); |
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402 | } |
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403 | |
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404 | if (!gnutls_error_is_fatal(ret)) { |
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405 | ap_log_error(APLOG_MARK, APLOG_INFO, 0, |
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406 | ctxt->c->base_server, |
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407 | "GnuTLS: Non-Fatal Handshake Error: (%d) '%s'", |
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408 | ret, gnutls_strerror(ret)); |
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409 | goto tryagain; |
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410 | } |
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411 | #if USING_2_1_RECENT |
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412 | ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, ctxt->c, |
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413 | "GnuTLS: Handshake Failed (%d) '%s'", ret, |
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414 | gnutls_strerror(ret)); |
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415 | #else |
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416 | ap_log_error(APLOG_MARK, APLOG_INFO, 0, |
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417 | ctxt->c->base_server, |
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418 | "GnuTLS: Handshake Failed (%d) '%s'", ret, |
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419 | gnutls_strerror(ret)); |
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420 | #endif |
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421 | ctxt->status = -1; |
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422 | if (ctxt->session) { |
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423 | gnutls_alert_send(ctxt->session, GNUTLS_AL_FATAL, |
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424 | gnutls_error_to_alert(ret, |
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425 | NULL)); |
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426 | gnutls_deinit(ctxt->session); |
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427 | } |
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428 | ctxt->session = NULL; |
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429 | return ret; |
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430 | } else { |
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431 | /* all done with the handshake */ |
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432 | ctxt->status = 1; |
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433 | /* If the session was resumed, we did not set the correct |
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434 | * server_rec in ctxt->sc. Go Find it. (ick!) |
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435 | */ |
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436 | if (gnutls_session_is_resumed(ctxt->session)) { |
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437 | mgs_srvconf_rec *sc; |
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438 | sc = mgs_find_sni_server(ctxt->session); |
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439 | if (sc) { |
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440 | ctxt->sc = sc; |
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441 | } |
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442 | } |
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443 | return 0; |
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444 | } |
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445 | } |
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446 | |
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447 | int mgs_rehandshake(mgs_handle_t * ctxt) { |
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448 | int rv; |
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449 | |
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450 | if (ctxt->session == NULL) |
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451 | return -1; |
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452 | |
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453 | rv = gnutls_rehandshake(ctxt->session); |
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454 | |
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455 | if (rv != 0) { |
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456 | /* the client did not want to rehandshake. goodbye */ |
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457 | ap_log_error(APLOG_MARK, APLOG_WARNING, 0, |
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458 | ctxt->c->base_server, |
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459 | "GnuTLS: Client Refused Rehandshake request."); |
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460 | return -1; |
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461 | } |
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462 | |
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463 | ctxt->status = 0; |
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464 | |
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465 | rv = gnutls_do_handshake(ctxt); |
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466 | |
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467 | return rv; |
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468 | } |
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469 | |
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470 | apr_status_t mgs_filter_input(ap_filter_t * f, |
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471 | apr_bucket_brigade * bb, |
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472 | ap_input_mode_t mode, |
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473 | apr_read_type_e block, apr_off_t readbytes) { |
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474 | apr_status_t status = APR_SUCCESS; |
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475 | mgs_handle_t *ctxt = (mgs_handle_t *) f->ctx; |
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476 | apr_size_t len = sizeof (ctxt->input_buffer); |
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477 | |
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478 | if (f->c->aborted) { |
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479 | apr_bucket *bucket = |
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480 | apr_bucket_eos_create(f->c->bucket_alloc); |
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481 | APR_BRIGADE_INSERT_TAIL(bb, bucket); |
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482 | return APR_ECONNABORTED; |
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483 | } |
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484 | |
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485 | if (ctxt->status == 0) { |
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486 | gnutls_do_handshake(ctxt); |
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487 | } |
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488 | |
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489 | if (ctxt->status < 0) { |
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490 | return ap_get_brigade(f->next, bb, mode, block, readbytes); |
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491 | } |
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492 | |
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493 | /* XXX: we don't currently support anything other than these modes. */ |
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494 | if (mode != AP_MODE_READBYTES && mode != AP_MODE_GETLINE && |
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495 | mode != AP_MODE_SPECULATIVE && mode != AP_MODE_INIT) { |
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496 | return APR_ENOTIMPL; |
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497 | } |
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498 | |
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499 | ctxt->input_mode = mode; |
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500 | ctxt->input_block = block; |
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501 | |
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502 | if (ctxt->input_mode == AP_MODE_READBYTES || |
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503 | ctxt->input_mode == AP_MODE_SPECULATIVE) { |
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504 | /* Err. This is bad. readbytes *can* be a 64bit int! len.. is NOT */ |
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505 | if (readbytes < len) { |
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506 | len = (apr_size_t) readbytes; |
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507 | } |
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508 | status = |
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509 | gnutls_io_input_read(ctxt, ctxt->input_buffer, &len); |
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510 | } else if (ctxt->input_mode == AP_MODE_GETLINE) { |
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511 | status = |
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512 | gnutls_io_input_getline(ctxt, ctxt->input_buffer, |
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513 | &len); |
---|
514 | } else { |
---|
515 | /* We have no idea what you are talking about, so return an error. */ |
---|
516 | return APR_ENOTIMPL; |
---|
517 | } |
---|
518 | |
---|
519 | if (status != APR_SUCCESS) { |
---|
520 | return gnutls_io_filter_error(f, bb, status); |
---|
521 | } |
---|
522 | |
---|
523 | /* Create a transient bucket out of the decrypted data. */ |
---|
524 | if (len > 0) { |
---|
525 | apr_bucket *bucket = |
---|
526 | apr_bucket_transient_create(ctxt->input_buffer, len, |
---|
527 | f->c->bucket_alloc); |
---|
528 | APR_BRIGADE_INSERT_TAIL(bb, bucket); |
---|
529 | } |
---|
530 | |
---|
531 | return status; |
---|
532 | } |
---|
533 | |
---|
534 | static ssize_t write_flush(mgs_handle_t * ctxt) { |
---|
535 | apr_bucket *e; |
---|
536 | |
---|
537 | if (!(ctxt->output_blen || ctxt->output_length)) { |
---|
538 | ctxt->output_rc = APR_SUCCESS; |
---|
539 | return 1; |
---|
540 | } |
---|
541 | |
---|
542 | if (ctxt->output_blen) { |
---|
543 | e = apr_bucket_transient_create(ctxt->output_buffer, |
---|
544 | ctxt->output_blen, |
---|
545 | ctxt->output_bb-> |
---|
546 | bucket_alloc); |
---|
547 | /* we filled this buffer first so add it to the |
---|
548 | * * head of the brigade |
---|
549 | * */ |
---|
550 | APR_BRIGADE_INSERT_HEAD(ctxt->output_bb, e); |
---|
551 | ctxt->output_blen = 0; |
---|
552 | } |
---|
553 | |
---|
554 | ctxt->output_length = 0; |
---|
555 | e = apr_bucket_flush_create(ctxt->output_bb->bucket_alloc); |
---|
556 | APR_BRIGADE_INSERT_TAIL(ctxt->output_bb, e); |
---|
557 | |
---|
558 | ctxt->output_rc = ap_pass_brigade(ctxt->output_filter->next, |
---|
559 | ctxt->output_bb); |
---|
560 | /* clear the brigade to be ready for next time */ |
---|
561 | apr_brigade_cleanup(ctxt->output_bb); |
---|
562 | |
---|
563 | return (ctxt->output_rc == APR_SUCCESS) ? 1 : -1; |
---|
564 | } |
---|
565 | |
---|
566 | apr_status_t mgs_filter_output(ap_filter_t * f, apr_bucket_brigade * bb) { |
---|
567 | apr_size_t ret; |
---|
568 | mgs_handle_t *ctxt = (mgs_handle_t *) f->ctx; |
---|
569 | apr_status_t status = APR_SUCCESS; |
---|
570 | apr_read_type_e rblock = APR_NONBLOCK_READ; |
---|
571 | |
---|
572 | if (f->c->aborted) { |
---|
573 | apr_brigade_cleanup(bb); |
---|
574 | return APR_ECONNABORTED; |
---|
575 | } |
---|
576 | |
---|
577 | if (ctxt->status == 0) { |
---|
578 | gnutls_do_handshake(ctxt); |
---|
579 | } |
---|
580 | |
---|
581 | if (ctxt->status < 0) { |
---|
582 | return ap_pass_brigade(f->next, bb); |
---|
583 | } |
---|
584 | |
---|
585 | while (!APR_BRIGADE_EMPTY(bb)) { |
---|
586 | apr_bucket *bucket = APR_BRIGADE_FIRST(bb); |
---|
587 | |
---|
588 | if (APR_BUCKET_IS_EOS(bucket)) { |
---|
589 | return ap_pass_brigade(f->next, bb); |
---|
590 | } else if (APR_BUCKET_IS_FLUSH(bucket)) { |
---|
591 | /* Try Flush */ |
---|
592 | if (write_flush(ctxt) < 0) { |
---|
593 | /* Flush Error */ |
---|
594 | return ctxt->output_rc; |
---|
595 | } |
---|
596 | /* cleanup! */ |
---|
597 | apr_bucket_delete(bucket); |
---|
598 | } else if (AP_BUCKET_IS_EOC(bucket)) { |
---|
599 | /* End Of Connection */ |
---|
600 | if (ctxt->session != NULL) { |
---|
601 | /* Try A Clean Shutdown */ |
---|
602 | do { |
---|
603 | ret = gnutls_bye(ctxt->session, GNUTLS_SHUT_WR); |
---|
604 | } while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN); |
---|
605 | /* De-Initialize Session */ |
---|
606 | gnutls_deinit(ctxt->session); |
---|
607 | ctxt->session = NULL; |
---|
608 | } |
---|
609 | /* cleanup! */ |
---|
610 | apr_bucket_delete(bucket); |
---|
611 | /* Pass next brigade! */ |
---|
612 | return ap_pass_brigade(f->next, bb); |
---|
613 | } else { |
---|
614 | /* filter output */ |
---|
615 | const char *data; |
---|
616 | apr_size_t len; |
---|
617 | |
---|
618 | status = apr_bucket_read(bucket, &data, &len, rblock); |
---|
619 | |
---|
620 | if (APR_STATUS_IS_EAGAIN(status)) { |
---|
621 | /* No data available so Flush! */ |
---|
622 | if (write_flush(ctxt) < 0) { |
---|
623 | return ctxt->output_rc; |
---|
624 | } |
---|
625 | /* Try again with a blocking read. */ |
---|
626 | rblock = APR_BLOCK_READ; |
---|
627 | continue; |
---|
628 | } |
---|
629 | |
---|
630 | rblock = APR_NONBLOCK_READ; |
---|
631 | |
---|
632 | if (!APR_STATUS_IS_EOF(status) |
---|
633 | && (status != APR_SUCCESS)) { |
---|
634 | return status; |
---|
635 | } |
---|
636 | |
---|
637 | if (len > 0) { |
---|
638 | |
---|
639 | if (ctxt->session == NULL) { |
---|
640 | ret = GNUTLS_E_INVALID_REQUEST; |
---|
641 | } else { |
---|
642 | do { |
---|
643 | ret = |
---|
644 | gnutls_record_send |
---|
645 | (ctxt->session, data, |
---|
646 | len); |
---|
647 | } while (ret == GNUTLS_E_INTERRUPTED |
---|
648 | || ret == GNUTLS_E_AGAIN); |
---|
649 | } |
---|
650 | |
---|
651 | if (ret < 0) { |
---|
652 | /* error sending output */ |
---|
653 | ap_log_error(APLOG_MARK, |
---|
654 | APLOG_INFO, |
---|
655 | ctxt->output_rc, |
---|
656 | ctxt->c->base_server, |
---|
657 | "GnuTLS: Error writing data." |
---|
658 | " (%d) '%s'", |
---|
659 | (int) ret, |
---|
660 | gnutls_strerror(ret)); |
---|
661 | if (ctxt->output_rc == APR_SUCCESS) { |
---|
662 | ctxt->output_rc = |
---|
663 | APR_EGENERAL; |
---|
664 | return ctxt->output_rc; |
---|
665 | } |
---|
666 | } else if (ret != len) { |
---|
667 | /* Not able to send the entire bucket, |
---|
668 | split it and send it again. */ |
---|
669 | apr_bucket_split(bucket, ret); |
---|
670 | } |
---|
671 | } |
---|
672 | |
---|
673 | apr_bucket_delete(bucket); |
---|
674 | } |
---|
675 | } |
---|
676 | |
---|
677 | return status; |
---|
678 | } |
---|
679 | |
---|
680 | ssize_t mgs_transport_read(gnutls_transport_ptr_t ptr, |
---|
681 | void *buffer, size_t len) { |
---|
682 | mgs_handle_t *ctxt = ptr; |
---|
683 | apr_status_t rc; |
---|
684 | apr_size_t in = len; |
---|
685 | apr_read_type_e block = ctxt->input_block; |
---|
686 | |
---|
687 | ctxt->input_rc = APR_SUCCESS; |
---|
688 | |
---|
689 | /* If Len = 0, we don't do anything. */ |
---|
690 | if (!len || buffer == NULL) { |
---|
691 | return 0; |
---|
692 | } |
---|
693 | if (!ctxt->input_bb) { |
---|
694 | ctxt->input_rc = APR_EOF; |
---|
695 | return -1; |
---|
696 | } |
---|
697 | |
---|
698 | if (APR_BRIGADE_EMPTY(ctxt->input_bb)) { |
---|
699 | |
---|
700 | rc = ap_get_brigade(ctxt->input_filter->next, |
---|
701 | ctxt->input_bb, AP_MODE_READBYTES, |
---|
702 | ctxt->input_block, in); |
---|
703 | |
---|
704 | /* Not a problem, there was simply no data ready yet. |
---|
705 | */ |
---|
706 | if (APR_STATUS_IS_EAGAIN(rc) || APR_STATUS_IS_EINTR(rc) |
---|
707 | || (rc == APR_SUCCESS |
---|
708 | && APR_BRIGADE_EMPTY(ctxt->input_bb))) { |
---|
709 | |
---|
710 | if (APR_STATUS_IS_EOF(ctxt->input_rc)) { |
---|
711 | return 0; |
---|
712 | } else { |
---|
713 | if (ctxt->session) |
---|
714 | gnutls_transport_set_errno(ctxt-> |
---|
715 | session, |
---|
716 | EINTR); |
---|
717 | return -1; |
---|
718 | } |
---|
719 | } |
---|
720 | |
---|
721 | |
---|
722 | if (rc != APR_SUCCESS) { |
---|
723 | /* Unexpected errors discard the brigade */ |
---|
724 | apr_brigade_cleanup(ctxt->input_bb); |
---|
725 | ctxt->input_bb = NULL; |
---|
726 | return -1; |
---|
727 | } |
---|
728 | } |
---|
729 | |
---|
730 | ctxt->input_rc = |
---|
731 | brigade_consume(ctxt->input_bb, block, buffer, &len); |
---|
732 | |
---|
733 | if (ctxt->input_rc == APR_SUCCESS) { |
---|
734 | return (ssize_t) len; |
---|
735 | } |
---|
736 | |
---|
737 | if (APR_STATUS_IS_EAGAIN(ctxt->input_rc) |
---|
738 | || APR_STATUS_IS_EINTR(ctxt->input_rc)) { |
---|
739 | if (len == 0) { |
---|
740 | if (ctxt->session) |
---|
741 | gnutls_transport_set_errno(ctxt->session, |
---|
742 | EINTR); |
---|
743 | return -1; |
---|
744 | } |
---|
745 | |
---|
746 | return (ssize_t) len; |
---|
747 | } |
---|
748 | |
---|
749 | /* Unexpected errors and APR_EOF clean out the brigade. |
---|
750 | * Subsequent calls will return APR_EOF. |
---|
751 | */ |
---|
752 | apr_brigade_cleanup(ctxt->input_bb); |
---|
753 | ctxt->input_bb = NULL; |
---|
754 | |
---|
755 | if (APR_STATUS_IS_EOF(ctxt->input_rc) && len) { |
---|
756 | /* Provide the results of this read pass, |
---|
757 | * without resetting the BIO retry_read flag |
---|
758 | */ |
---|
759 | return (ssize_t) len; |
---|
760 | } |
---|
761 | |
---|
762 | return -1; |
---|
763 | } |
---|
764 | |
---|
765 | ssize_t mgs_transport_write(gnutls_transport_ptr_t ptr, |
---|
766 | const void *buffer, size_t len) { |
---|
767 | mgs_handle_t *ctxt = ptr; |
---|
768 | |
---|
769 | /* pass along the encrypted data |
---|
770 | * need to flush since we're using SSL's malloc-ed buffer |
---|
771 | * which will be overwritten once we leave here |
---|
772 | */ |
---|
773 | apr_bucket *bucket = apr_bucket_transient_create(buffer, len, |
---|
774 | ctxt->output_bb-> |
---|
775 | bucket_alloc); |
---|
776 | ctxt->output_length += len; |
---|
777 | APR_BRIGADE_INSERT_TAIL(ctxt->output_bb, bucket); |
---|
778 | |
---|
779 | if (write_flush(ctxt) < 0) { |
---|
780 | return -1; |
---|
781 | } |
---|
782 | return len; |
---|
783 | } |
---|