1 aac8053c 2021-08-12 xhr /*
  2 aac8053c 2021-08-12 xhr  * Copyright (c) 2021 Matthias Schmidt <xhr@giessen.ccc.de>
  3 aac8053c 2021-08-12 xhr  *
  4 aac8053c 2021-08-12 xhr  * Permission to use, copy, modify, and distribute this software for any
  5 aac8053c 2021-08-12 xhr  * purpose with or without fee is hereby granted, provided that the above
  6 aac8053c 2021-08-12 xhr  * copyright notice and this permission notice appear in all copies.
  7 aac8053c 2021-08-12 xhr  *
  8 aac8053c 2021-08-12 xhr  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9 aac8053c 2021-08-12 xhr  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10 aac8053c 2021-08-12 xhr  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11 aac8053c 2021-08-12 xhr  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12 aac8053c 2021-08-12 xhr  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13 aac8053c 2021-08-12 xhr  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14 aac8053c 2021-08-12 xhr  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15 aac8053c 2021-08-12 xhr  */
 16 aac8053c 2021-08-12 xhr 
 17 0f9df5ff 2021-08-06 xhr #include <sys/socket.h>
 18 edc334c2 2021-08-05 xhr #include <sys/stat.h>
 19 edc334c2 2021-08-05 xhr 
 20 edc334c2 2021-08-05 xhr #include <err.h>
 21 edc334c2 2021-08-05 xhr #include <errno.h>
 22 edc334c2 2021-08-05 xhr #include <fcntl.h>
 23 edc334c2 2021-08-05 xhr #include <stdio.h>
 24 edc334c2 2021-08-05 xhr #include <string.h>
 25 edc334c2 2021-08-05 xhr #include <unistd.h>
 26 edc334c2 2021-08-05 xhr 
 27 0f9df5ff 2021-08-06 xhr #include "log.h"
 28 0f9df5ff 2021-08-06 xhr #include "twind.h"
 29 edc334c2 2021-08-05 xhr 
 30 edc334c2 2021-08-05 xhr static void
 31 8c443bed 2021-08-10 xhr generate_meta(int status_code, char *meta_response_string, const char *mime)
 32 edc334c2 2021-08-05 xhr {
 33 edc334c2 2021-08-05 xhr 	switch(status_code) {
 34 0f9df5ff 2021-08-06 xhr 		case STATUS_INPUT:
 35 0f9df5ff 2021-08-06 xhr 			snprintf(meta_response_string, 1024, "%d Present input\r\n", status_code);
 36 edc334c2 2021-08-05 xhr 			break;
 37 edc334c2 2021-08-05 xhr 		case STATUS_SENSITIVE_INPUT:
 38 0f5f93fa 2021-08-12 xhr 			snprintf(meta_response_string, 1024, "%d Present sensitive input\r\n",
 39 0f5f93fa 2021-08-12 xhr 				status_code);
 40 edc334c2 2021-08-05 xhr 			break;
 41 edc334c2 2021-08-05 xhr 		case STATUS_SUCCESS:
 42 774afac7 2021-08-15 xhr 			if (mime == NULL)
 43 774afac7 2021-08-15 xhr 				/* Could not deducte mime type, so send text/gemini as default */
 44 774afac7 2021-08-15 xhr 				snprintf(meta_response_string, 1024, "%d text/gemini\r\n", status_code);
 45 774afac7 2021-08-15 xhr 			else
 46 774afac7 2021-08-15 xhr 				snprintf(meta_response_string, 1024, "%d %s\r\n", status_code, mime);
 47 edc334c2 2021-08-05 xhr 			break;
 48 edc334c2 2021-08-05 xhr 		case STATUS_REDIRECT_TEMP:
 49 0f5f93fa 2021-08-12 xhr 			snprintf(meta_response_string, 1024, "%d Temporary redirect\r\n",
 50 0f5f93fa 2021-08-12 xhr 				status_code);
 51 edc334c2 2021-08-05 xhr 			break;
 52 edc334c2 2021-08-05 xhr 		case STATUS_REDIRECT_PERM:
 53 0f5f93fa 2021-08-12 xhr 			snprintf(meta_response_string, 1024, "%d Permanent redirect\r\n",
 54 0f5f93fa 2021-08-12 xhr 				status_code);
 55 edc334c2 2021-08-05 xhr 			break;
 56 edc334c2 2021-08-05 xhr 		case STATUS_TEMP_UNAVAILABLE:
 57 0f5f93fa 2021-08-12 xhr 			snprintf(meta_response_string, 1024, "%d Temporary failure\r\n",
 58 0f5f93fa 2021-08-12 xhr 				status_code);
 59 edc334c2 2021-08-05 xhr 			break;
 60 edc334c2 2021-08-05 xhr 		case STATUS_SERVER_UNAVAILABLE:
 61 0f5f93fa 2021-08-12 xhr 			snprintf(meta_response_string, 1024, "%d Server unavailable\r\n",
 62 0f5f93fa 2021-08-12 xhr 				status_code);
 63 edc334c2 2021-08-05 xhr 			break;
 64 edc334c2 2021-08-05 xhr 		case STATUS_CGI_ERROR:
 65 0f9df5ff 2021-08-06 xhr 			snprintf(meta_response_string, 1024, "%d CGI Error\r\n", status_code);
 66 edc334c2 2021-08-05 xhr 			break;
 67 edc334c2 2021-08-05 xhr 		case STATUS_PROXY_ERROR:
 68 0f9df5ff 2021-08-06 xhr 			snprintf(meta_response_string, 1024, "%d Proxy error\r\n", status_code);
 69 edc334c2 2021-08-05 xhr 			break;
 70 edc334c2 2021-08-05 xhr 		case STATUS_SLOW_DOWN:
 71 0f9df5ff 2021-08-06 xhr 			snprintf(meta_response_string, 1024, "%d Slow down\r\n", status_code);
 72 edc334c2 2021-08-05 xhr 			break;
 73 edc334c2 2021-08-05 xhr 		case STATUS_PERM_FAILURE:
 74 0f9df5ff 2021-08-06 xhr 			snprintf(meta_response_string, 1024, "%d Permanent failure\r\n", status_code);
 75 edc334c2 2021-08-05 xhr 			break;
 76 edc334c2 2021-08-05 xhr 		case STATUS_NOT_FOUND:
 77 0f5f93fa 2021-08-12 xhr 			snprintf(meta_response_string, 1024, "%d Resource not found\r\n",
 78 0f5f93fa 2021-08-12 xhr 				status_code);
 79 edc334c2 2021-08-05 xhr 			break;
 80 edc334c2 2021-08-05 xhr 		case STATUS_GONE:
 81 0f9df5ff 2021-08-06 xhr 			snprintf(meta_response_string, 1024, "%d Resource is gone\r\n", status_code);
 82 edc334c2 2021-08-05 xhr 			break;
 83 edc334c2 2021-08-05 xhr 		case STATUS_PROXY_REQUEST_REFUSED:
 84 0f5f93fa 2021-08-12 xhr 			snprintf(meta_response_string, 1024, "%d Proxy request refused\r\n",
 85 0f5f93fa 2021-08-12 xhr 				status_code);
 86 edc334c2 2021-08-05 xhr 			break;
 87 edc334c2 2021-08-05 xhr 		case STATUS_BAD_REQUEST:
 88 0f9df5ff 2021-08-06 xhr 			snprintf(meta_response_string, 1024, "%d Bad Request\r\n", status_code);
 89 edc334c2 2021-08-05 xhr 			break;
 90 edc334c2 2021-08-05 xhr 		case STATUS_CLIENT_CERT_REQUIRED:
 91 0f5f93fa 2021-08-12 xhr 			snprintf(meta_response_string, 1024, "%d Client Certificate Required\r\n",
 92 0f5f93fa 2021-08-12 xhr 				status_code);
 93 edc334c2 2021-08-05 xhr 			break;
 94 edc334c2 2021-08-05 xhr 		case STATUS_CERT_NOT_AUTHORIZED:
 95 0f5f93fa 2021-08-12 xhr 			snprintf(meta_response_string, 1024, "%d Certificate not authorized\r\n",
 96 0f5f93fa 2021-08-12 xhr 				status_code);
 97 edc334c2 2021-08-05 xhr 			break;
 98 edc334c2 2021-08-05 xhr 		case STATUS_CERT_NOT_VALID:
 99 0f5f93fa 2021-08-12 xhr 			snprintf(meta_response_string, 1024, "%d Certificate not valid\r\n",
100 0f5f93fa 2021-08-12 xhr 				status_code);
101 edc334c2 2021-08-05 xhr 			break;
102 0f5f93fa 2021-08-12 xhr 		default:
103 0f5f93fa 2021-08-12 xhr 			snprintf(meta_response_string, 1024, "%d Unkown status code\r\n",
104 0f5f93fa 2021-08-12 xhr 				status_code);
105 edc334c2 2021-08-05 xhr 			break;
106 edc334c2 2021-08-05 xhr 	}
107 edc334c2 2021-08-05 xhr }
108 edc334c2 2021-08-05 xhr 
109 edc334c2 2021-08-05 xhr int
110 ab99638a 2021-08-08 xhr send_non_success_response(SSL *ssl_peer, int status_code)
111 0f9df5ff 2021-08-06 xhr {
112 0f9df5ff 2021-08-06 xhr 	char meta[1024];
113 0f9df5ff 2021-08-06 xhr 
114 0f9df5ff 2021-08-06 xhr 	memset(meta, 0, sizeof(meta));
115 0f9df5ff 2021-08-06 xhr 
116 8c443bed 2021-08-10 xhr 	generate_meta(status_code, meta, NULL);
117 0f9df5ff 2021-08-06 xhr 
118 0f9df5ff 2021-08-06 xhr 	log_debug("Send non success response to client: %s", meta);
119 0f9df5ff 2021-08-06 xhr 
120 84033a53 2021-08-08 xhr 	if (SSL_write(ssl_peer, meta, strlen(meta)) <= 0) {
121 84033a53 2021-08-08 xhr 		log_warn("Could not send response to client");
122 0f9df5ff 2021-08-06 xhr 		return -1;
123 0f9df5ff 2021-08-06 xhr 	}
124 0f9df5ff 2021-08-06 xhr 
125 0f9df5ff 2021-08-06 xhr 	return 0;
126 0f9df5ff 2021-08-06 xhr }
127 0f9df5ff 2021-08-06 xhr 
128 0f9df5ff 2021-08-06 xhr int
129 0f5f93fa 2021-08-12 xhr send_response(SSL *ssl_peer, int status_code, const char *gemini_file_path,
130 0f5f93fa 2021-08-12 xhr 	const char *mime)
131 edc334c2 2021-08-05 xhr {
132 edc334c2 2021-08-05 xhr 	char meta[1024];
133 edc334c2 2021-08-05 xhr 	char buffer[1024];
134 78e56b5d 2021-08-12 xhr 	int fd = -1, len;
135 edc334c2 2021-08-05 xhr 
136 edc334c2 2021-08-05 xhr 	// <STATUS><SPACE><META><CR><LF>
137 edc334c2 2021-08-05 xhr 
138 edc334c2 2021-08-05 xhr 	memset(meta, 0, sizeof(meta));
139 edc334c2 2021-08-05 xhr 	memset(buffer, 0, sizeof(buffer));
140 edc334c2 2021-08-05 xhr 
141 8c443bed 2021-08-10 xhr 	generate_meta(status_code, meta, mime);
142 edc334c2 2021-08-05 xhr 
143 84033a53 2021-08-08 xhr 	if (SSL_write(ssl_peer, meta, strlen(meta)) <= 0) {
144 84033a53 2021-08-08 xhr 		log_warn("Could not send response to client");
145 bf09eac4 2021-08-06 xhr 		return -1;
146 bf09eac4 2021-08-06 xhr 	}
147 edc334c2 2021-08-05 xhr 
148 edc334c2 2021-08-05 xhr 	/* Close connection and do not send a response if status code is not
149 edc334c2 2021-08-05 xhr 	 * a SUCCESS code
150 edc334c2 2021-08-05 xhr 	 */
151 edc334c2 2021-08-05 xhr 	if (status_code < 30 && status_code >= 20) {
152 edc334c2 2021-08-05 xhr 		fd = open(gemini_file_path, O_RDONLY);
153 edc334c2 2021-08-05 xhr 		if (fd == -1) {
154 d034a409 2021-08-13 xhr 			log_warn("Cannot open requested file");
155 edc334c2 2021-08-05 xhr 			goto out;
156 edc334c2 2021-08-05 xhr 		}
157 edc334c2 2021-08-05 xhr 
158 edc334c2 2021-08-05 xhr 		while ((len = read(fd, buffer, sizeof(buffer)-1)) > 0) {
159 b8ccf1a1 2021-08-08 xhr 			if (SSL_write(ssl_peer, buffer, len) <= 0) {
160 84033a53 2021-08-08 xhr 				log_warn("Could not send response to client");
161 bf09eac4 2021-08-06 xhr 				return -1;
162 bf09eac4 2021-08-06 xhr 			}
163 edc334c2 2021-08-05 xhr 		}
164 edc334c2 2021-08-05 xhr 	}
165 edc334c2 2021-08-05 xhr 
166 edc334c2 2021-08-05 xhr out:
167 4b19570b 2021-08-12 xhr 	close(fd);
168 edc334c2 2021-08-05 xhr 
169 edc334c2 2021-08-05 xhr 	return 0;
170 edc334c2 2021-08-05 xhr }
171 edc334c2 2021-08-05 xhr 
172 7a5ce97f 2021-08-06 xhr int
173 edc334c2 2021-08-05 xhr check_gemini_file(const char *gemini_file_path)
174 edc334c2 2021-08-05 xhr {
175 edc334c2 2021-08-05 xhr 	struct stat sb;
176 edc334c2 2021-08-05 xhr 
177 edc334c2 2021-08-05 xhr 	if (stat(gemini_file_path, &sb) == -1) {
178 d034a409 2021-08-13 xhr 		log_warn("Cannot open requested file");
179 edc334c2 2021-08-05 xhr 		return -1;
180 edc334c2 2021-08-05 xhr 	}
181 edc334c2 2021-08-05 xhr 
182 edc334c2 2021-08-05 xhr 	if ((sb.st_mode & (S_IRUSR | S_IRGRP | S_IROTH)) == 0) {
183 d034a409 2021-08-13 xhr 		log_warn("Cannot read requested file");
184 edc334c2 2021-08-05 xhr 		return -1;
185 edc334c2 2021-08-05 xhr 	}
186 edc334c2 2021-08-05 xhr 
187 5bbe30c9 2021-08-11 xhr 	if ((sb.st_mode & S_IFMT) == S_IFDIR)
188 5bbe30c9 2021-08-11 xhr 		return 1;
189 5bbe30c9 2021-08-11 xhr 
190 edc334c2 2021-08-05 xhr 	return 0;
191 edc334c2 2021-08-05 xhr }