src/server/safs/cgi.c

Thu, 21 Apr 2022 17:16:49 +0200

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Thu, 21 Apr 2022 17:16:49 +0200
branch
webdav
changeset 305
4db64fe30588
parent 254
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child 359
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permissions
-rw-r--r--

change pg_resolve_path signature to be useable without VFS

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2016 Olaf Wintermann. All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 #include "cgi.h"
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30
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31 #include <stdio.h>
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32 #include <stdlib.h>
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33 #include <unistd.h>
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34
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35 #include <sys/types.h>
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36 #include <signal.h>
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37 #include <sys/wait.h>
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38
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39 #include <ucx/string.h>
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40
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41 #include "../util/util.h"
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42 #include "../util/pblock.h"
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43 #include "../daemon/netsite.h"
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44 #include "../util/io.h"
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45
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46 #include "cgiutils.h"
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47
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48 #define CGI_VARS 32
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49
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50 #define CGI_RESPONSE_PARSER_BUFLEN 2048
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51 #define CGI_RESPONSE_MAX_LINE_LENGTH 512
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52
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53 int send_cgi(pblock *pb, Session *sn, Request *rq) {
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54 char *path = pblock_findkeyval(pb_key_path, rq->vars);
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55 char *ctlen = pblock_findkeyval(pb_key_content_length, rq->headers);
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56 int64_t content_length = 0;
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57
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58 if(ctlen) {
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59 if(!util_strtoint(ctlen, &content_length)) {
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60 log_ereport(
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61 LOG_FAILURE,
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62 "send-cgi: content-length header is not an integer");
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63 protocol_status(sn, rq, 400, NULL);
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64 return REQ_ABORTED;
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65 }
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66 }
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67
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68 struct stat s;
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69 if(stat(path, &s)) {
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70 int statuscode = util_errno2status(errno);
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71 protocol_status(sn, rq, statuscode, NULL);
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72 return REQ_ABORTED;
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73 }
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74 if(S_ISDIR(s.st_mode)) {
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75 protocol_status(sn, rq, 403, NULL);
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76 return REQ_ABORTED;
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77 }
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78
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79 param_free(pblock_remove("content-type", rq->srvhdrs));
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80
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81 const char *args = pblock_findval("query", rq->reqpb);
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82 char **argv = cgi_create_argv(path, NULL, args);
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83
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84 char **env = http_hdrs2env(rq->headers);
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85 env = cgi_common_vars(sn, rq, env);
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86 env = cgi_specific_vars(sn, rq, args, env, 1);
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87
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88 CGIProcess cgip;
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89 int ret = cgi_start(&cgip, path, argv, env);
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90 if(ret != REQ_PROCEED) {
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91 util_env_free(env);
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92 cgi_free_argv(argv);
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93 return ret;
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94 }
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96 util_env_free(env);
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97 cgi_free_argv(argv);
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98
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99 char buf[4096]; // I/O buffer
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100 ssize_t r;
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101
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102 if(content_length > 0) {
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103 ssize_t n = 0;
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104 while(n < content_length) {
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105 r = netbuf_getbytes(sn->inbuf, buf, 4096);
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106 if(r <= 0) {
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107 // TODO: handle error
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108 log_ereport(
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109 LOG_FAILURE,
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110 "send-cgi: script: %s: cannot read request body",
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111 path);
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112 kill(cgip.pid, SIGTERM);
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113 cgi_close(&cgip);
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114 return REQ_ABORTED;
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115 }
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116 ssize_t w = write(cgip.in[1], buf, r);
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117 if(w <= 0) {
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118 // TODO: handle error
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119 log_ereport(
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120 LOG_FAILURE,
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121 "send-cgi: script: %s: cannot send request body to cgi process",
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122 path);
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123 kill(cgip.pid, SIGKILL);
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124 cgi_close(&cgip);
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125 return REQ_ABORTED;
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126 }
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127 n += r;
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128 }
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129 }
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130 system_close(cgip.in[1]);
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131 cgip.in[1] = -1;
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132
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133 // read from child
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134 CGIResponseParser *parser = cgi_parser_new(sn, rq);
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135 WSBool cgiheader = TRUE;
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136 ssize_t wr = 0;
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137 int result = REQ_PROCEED;
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138 size_t response_length = 0;
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139 while((r = read(cgip.out[0], buf, 4096)) > 0) {
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140 if(cgiheader) {
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141 size_t pos;
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142 ret = cgi_parse_response(parser, buf, r, &pos);
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143 if(ret == -1) {
162
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diff changeset
144 log_ereport(
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parents: 161
diff changeset
145 LOG_FAILURE,
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diff changeset
146 "broken cgi script response: path: %s", path);
118
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147 protocol_status(sn, rq, 500, NULL);
125
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diff changeset
148 result = REQ_ABORTED;
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diff changeset
149 break;
118
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150 } else if(ret == 1) {
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151 cgiheader = FALSE;
124
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diff changeset
152 if(parser->status > 0) {
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diff changeset
153 protocol_status(sn, rq, parser->status, parser->msg);
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diff changeset
154 }
118
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155 http_start_response(sn, rq);
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156 if(pos < r) {
162
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diff changeset
157 response_length += r-pos;
125
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diff changeset
158 wr = net_write(sn->csd, &buf[pos], r-pos);
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diff changeset
159 if(wr <= 0) {
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diff changeset
160 result = REQ_ABORTED;
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diff changeset
161 break;
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diff changeset
162 }
118
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163 }
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parents:
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164 }
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parents:
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165 } else {
164
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diff changeset
166 response_length += r;
125
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diff changeset
167 wr = net_write(sn->csd, buf, r);
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diff changeset
168 if(wr <= 0) {
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diff changeset
169 result = REQ_ABORTED;
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diff changeset
170 break;
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diff changeset
171 }
118
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172 }
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173 }
144
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diff changeset
174
162
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diff changeset
175 char *ctlen_header = pblock_findkeyval(pb_key_content_length, rq->srvhdrs);
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176 if(ctlen_header) {
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177 int64_t ctlenhdr;
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diff changeset
178 if(util_strtoint(ctlen_header, &ctlenhdr)) {
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diff changeset
179 if(ctlenhdr != response_length) {
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diff changeset
180 log_ereport(
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diff changeset
181 LOG_FAILURE,
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diff changeset
182 "cgi-send: script: %s: content length mismatch",
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parents: 161
diff changeset
183 path);
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diff changeset
184 rq->rq_attr.keep_alive = 0;
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diff changeset
185 result = REQ_ABORTED;
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diff changeset
186 }
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parents: 161
diff changeset
187 }
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parents: 161
diff changeset
188 }
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diff changeset
189
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parents: 161
diff changeset
190 if(result == REQ_ABORTED) {
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diff changeset
191 log_ereport(LOG_FAILURE, "cgi-send: kill script: %s", path);
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parents: 161
diff changeset
192 kill(cgip.pid, SIGKILL);
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diff changeset
193 }
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diff changeset
194 cgi_close(&cgip); // TODO: check return value
126
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diff changeset
195
124
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diff changeset
196 cgi_parser_free(parser);
125
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diff changeset
197 return result;
118
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198 }
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199
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200 int cgi_start(CGIProcess *p, char *path, char *const argv[], char *const envp[]) {
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201 if(pipe(p->in) || pipe(p->out)) {
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parents:
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202 log_ereport(
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diff changeset
203 LOG_FAILURE,
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parents:
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204 "send-cgi: cannot create pipe: %s",
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205 strerror(errno));
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206 return REQ_ABORTED;
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207 }
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208
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209 p->pid = fork();
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210 if(p->pid == 0) {
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211 // child
120
d2eb5fd97df0 adds chdir before cgi execution
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diff changeset
212
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diff changeset
213 // get script directory and script name
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diff changeset
214 sstr_t script = sstr(path);
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diff changeset
215 sstr_t parent;
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diff changeset
216 int len = strlen(path);
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diff changeset
217 for(int i=len-1;i>=0;i--) {
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diff changeset
218 if(path[i] == '/') {
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diff changeset
219 script = sstrn(path + i + 1, len - i);
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diff changeset
220 parent = sstrdup(sstrn(path, i));
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parents: 119
diff changeset
221 if(chdir(parent.ptr)) {
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diff changeset
222 perror("cgi_start: chdir");
d2eb5fd97df0 adds chdir before cgi execution
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diff changeset
223 free(parent.ptr);
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diff changeset
224 exit(-1);
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diff changeset
225 }
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parents: 119
diff changeset
226 free(parent.ptr);
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diff changeset
227 break;
d2eb5fd97df0 adds chdir before cgi execution
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diff changeset
228 }
d2eb5fd97df0 adds chdir before cgi execution
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parents: 119
diff changeset
229 }
d2eb5fd97df0 adds chdir before cgi execution
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parents: 119
diff changeset
230
118
38bf6dd8f4e7 adds minimal cgi implementation
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231 if(dup2(p->in[0], STDIN_FILENO) == -1) {
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parents:
diff changeset
232 perror("cgi_start: dup2");
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diff changeset
233 exit(EXIT_FAILURE);
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parents:
diff changeset
234 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
235 if(dup2(p->out[1], STDOUT_FILENO) == -1) {
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diff changeset
236 perror("cgi_start: dup2");
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237 exit(EXIT_FAILURE);
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parents:
diff changeset
238 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
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239
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
240 // we need to close this unused pipe
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diff changeset
241 // otherwise stdin cannot reach EOF
171
af7e2d80dee6 adds wrapper for close syscall with error handling
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parents: 164
diff changeset
242 system_close(p->in[1]);
118
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parents:
diff changeset
243
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
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244 // execute program
120
d2eb5fd97df0 adds chdir before cgi execution
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parents: 119
diff changeset
245 exit(execve(script.ptr, argv, envp));
118
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parents:
diff changeset
246 } else {
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247 // parent
171
af7e2d80dee6 adds wrapper for close syscall with error handling
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parents: 164
diff changeset
248 system_close(p->out[1]);
144
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diff changeset
249 p->out[1] = -1;
118
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diff changeset
250 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
251
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
252 return REQ_PROCEED;
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parents:
diff changeset
253 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
254
162
b169992137a8 improves cgi error handling and allows requests with empty headers
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parents: 161
diff changeset
255 int cgi_close(CGIProcess *p) {
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parents: 161
diff changeset
256 int status = -1;
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diff changeset
257 waitpid(p->pid, &status, 0);
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parents: 161
diff changeset
258
144
4b546c4f25ed fixes cgi fd leak
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parents: 133
diff changeset
259 if(p->in[0] != -1) {
171
af7e2d80dee6 adds wrapper for close syscall with error handling
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parents: 164
diff changeset
260 system_close(p->in[0]);
144
4b546c4f25ed fixes cgi fd leak
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diff changeset
261 }
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parents: 133
diff changeset
262 if(p->in[1] != -1) {
171
af7e2d80dee6 adds wrapper for close syscall with error handling
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parents: 164
diff changeset
263 system_close(p->in[1]);
144
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diff changeset
264 }
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parents: 133
diff changeset
265 if(p->out[0] != -1) {
171
af7e2d80dee6 adds wrapper for close syscall with error handling
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parents: 164
diff changeset
266 system_close(p->out[0]);
144
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diff changeset
267 }
4b546c4f25ed fixes cgi fd leak
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parents: 133
diff changeset
268 if(p->out[1] != -1) {
171
af7e2d80dee6 adds wrapper for close syscall with error handling
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parents: 164
diff changeset
269 system_close(p->out[1]);
144
4b546c4f25ed fixes cgi fd leak
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parents: 133
diff changeset
270 }
162
b169992137a8 improves cgi error handling and allows requests with empty headers
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parents: 161
diff changeset
271
b169992137a8 improves cgi error handling and allows requests with empty headers
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diff changeset
272 return 0;
144
4b546c4f25ed fixes cgi fd leak
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parents: 133
diff changeset
273 }
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parents: 133
diff changeset
274
118
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275 CGIResponseParser* cgi_parser_new(Session *sn, Request *rq) {
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parents:
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276 CGIResponseParser* parser = pool_malloc(sn->pool, sizeof(CGIResponseParser));
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parents:
diff changeset
277 parser->sn = sn;
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diff changeset
278 parser->rq = rq;
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diff changeset
279 parser->tmp = ucx_buffer_new(NULL, 64, UCX_BUFFER_AUTOEXTEND);
124
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parents: 123
diff changeset
280 parser->status = 0;
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diff changeset
281 parser->msg = NULL;
118
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282 return parser;
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parents:
diff changeset
283 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
284
124
85985e88f63b using the status code from cgi output now
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parents: 123
diff changeset
285 void cgi_parser_free(CGIResponseParser *parser) {
85985e88f63b using the status code from cgi output now
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parents: 123
diff changeset
286 if(parser->tmp) {
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diff changeset
287 ucx_buffer_free(parser->tmp);
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diff changeset
288 }
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289 pool_free(parser->sn->pool, parser);
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290 }
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291
118
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292 /*
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293 * parses a cgi response line and adds the response header to rq->srvhdrs
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294 * returns 0: incomplete line
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295 * 1: successfully parsed lines
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296 * 2: cgi response header complete (empty line)
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297 * -1: error
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298 */
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299 static int parse_lines(CGIResponseParser *parser, char *buf, size_t len, int *pos) {
145
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300 UcxAllocator a = util_pool_allocator(parser->sn->pool);
118
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301 sstr_t name;
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302 sstr_t value;
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303 WSBool space = TRUE;
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304 int i;
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305
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306 int line_begin = 0;
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307 int value_begin = 0;
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308 for(i=0;i<len;i++) {
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309 char c = buf[i];
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310 if(value_begin == line_begin && c == ':') {
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311 name = sstrn(buf + line_begin, i - line_begin);
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312 value_begin = i + 1;
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313 } else if(c == '\n') {
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314 if(value_begin == line_begin) {
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315 if(space) {
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316 *pos = i + 1;
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317 return 2;
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318 } else {
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319 // line ends with content but without ':' -> error
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320 return -1;
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321 }
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322 }
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323 value = sstrn(buf + value_begin, i - value_begin);
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324
145
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325 name = sstrlower_a(&a, sstrtrim(name));
118
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326 value = sstrtrim(value);
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327
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328 if(name.length == 0 || value.length == 0) {
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329 return -1;
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330 }
124
85985e88f63b using the status code from cgi output now
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diff changeset
331
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diff changeset
332 if(!sstrcmp(name, S("status"))) {
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333 sstr_t codestr = value;
133
87b405d61f64 improves event handler and ssl error handling
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diff changeset
334 int j;
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335 for(j=0;j<codestr.length;j++) {
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336 if(!isdigit(codestr.ptr[j])) {
124
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337 break;
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338 }
133
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339 if(j > 2) {
124
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340 break;
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341 }
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342 }
133
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343 codestr.ptr[j] = '\0';
124
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344
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diff changeset
345 int64_t s = 0;
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346 util_strtoint(codestr.ptr, &s);
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347 parser->status = (int)s;
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348
133
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349 sstr_t msg = sstrtrim(sstrsubs(value, j + 1));
124
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350
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351 if(msg.length > 0) {
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352 parser->msg = sstrdup_pool(parser->sn->pool, msg).ptr;
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353 }
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354 } else {
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diff changeset
355 pblock_nvlinsert(
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356 name.ptr,
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diff changeset
357 name.length,
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diff changeset
358 value.ptr,
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diff changeset
359 value.length,
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360 parser->rq->srvhdrs);
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361 }
118
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362
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363 line_begin = i+1;
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364 value_begin = line_begin;
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365 space = TRUE;
121
a881dc866e23 adds more CGI stuff
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diff changeset
366 } else if(!isspace(c)) {
118
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367 space = FALSE;
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368 }
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parents:
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369 }
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parents:
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370
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371 if(i < len) {
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372 *pos = i;
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373 return 0;
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parents:
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374 }
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parents:
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375 return 1;
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parents:
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376 }
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parents:
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377
38bf6dd8f4e7 adds minimal cgi implementation
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378 /*
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parents:
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379 * returns -1: error
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parents:
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380 * 0: response header incomplete
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381 * 1: complete
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diff changeset
382 */
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parents:
diff changeset
383 int cgi_parse_response(CGIResponseParser *parser, char *buf, size_t len, size_t *bpos) {
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parents:
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384 *bpos = 0;
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parents:
diff changeset
385 int pos = 0;
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parents:
diff changeset
386 if(parser->tmp->pos > 0) {
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parents:
diff changeset
387 // the tmp buffer contains an unfinished line
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388 // fill up the buffer until the line is complete
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389 WSBool nb = FALSE;
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parents:
diff changeset
390 for(pos=0;pos<len;pos++) {
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parents:
diff changeset
391 if(buf[pos] == '\n') {
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392 nb = TRUE;
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parents:
diff changeset
393 break;
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parents:
diff changeset
394 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
395 }
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parents:
diff changeset
396 ucx_buffer_write(buf, 1, pos, parser->tmp);
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parents:
diff changeset
397
38bf6dd8f4e7 adds minimal cgi implementation
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diff changeset
398 if(nb) {
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parents:
diff changeset
399 // line complete
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parents:
diff changeset
400 int npos;
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parents:
diff changeset
401 int r = parse_lines(parser, parser->tmp->space, parser->tmp->pos, &npos);
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parents:
diff changeset
402 switch(r) {
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parents:
diff changeset
403 case -1: return -1;
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
404 case 0: return -1;
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
405 case 1: break;
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parents:
diff changeset
406 case 2: {
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parents:
diff changeset
407 *bpos = pos + 1;
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parents:
diff changeset
408 return 1;
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
409 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
410 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
411 // reset tmp buffer
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parents:
diff changeset
412 parser->tmp->pos = 0;
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parents:
diff changeset
413 } else {
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
414 if(parser->tmp->pos > CGI_RESPONSE_MAX_LINE_LENGTH) {
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parents:
diff changeset
415 return -1;
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
416 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
417 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
418 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
419
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
420 int npos = 0;
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parents:
diff changeset
421 int r = parse_lines(parser, buf + pos, len - pos, &npos);
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parents:
diff changeset
422 switch(r) {
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
423 default: return -1;
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
424 case 0:
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
425 case 1: {
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
426 int newlen = len - npos;
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parents:
diff changeset
427 if(npos > 0) {
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parents:
diff changeset
428 ucx_buffer_write(buf + npos, 1, newlen, parser->tmp);
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parents:
diff changeset
429 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
430 return 0;
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
431 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
432 case 2: {
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parents:
diff changeset
433 *bpos = pos + npos;
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parents:
diff changeset
434 return 1;
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
diff changeset
435 }
38bf6dd8f4e7 adds minimal cgi implementation
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parents:
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436 }
171
af7e2d80dee6 adds wrapper for close syscall with error handling
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parents: 164
diff changeset
437 }

mercurial