/src/curl/lib/vtls/keylog.c
Line | Count | Source |
1 | | /*************************************************************************** |
2 | | * _ _ ____ _ |
3 | | * Project ___| | | | _ \| | |
4 | | * / __| | | | |_) | | |
5 | | * | (__| |_| | _ <| |___ |
6 | | * \___|\___/|_| \_\_____| |
7 | | * |
8 | | * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. |
9 | | * |
10 | | * This software is licensed as described in the file COPYING, which |
11 | | * you should have received as part of this distribution. The terms |
12 | | * are also available at https://curl.se/docs/copyright.html. |
13 | | * |
14 | | * You may opt to use, copy, modify, merge, publish, distribute and/or sell |
15 | | * copies of the Software, and permit persons to whom the Software is |
16 | | * furnished to do so, under the terms of the COPYING file. |
17 | | * |
18 | | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY |
19 | | * KIND, either express or implied. |
20 | | * |
21 | | * SPDX-License-Identifier: curl |
22 | | * |
23 | | ***************************************************************************/ |
24 | | #include "../curl_setup.h" |
25 | | |
26 | | #if defined(USE_OPENSSL) || \ |
27 | | defined(USE_GNUTLS) || \ |
28 | | defined(USE_WOLFSSL) || \ |
29 | | (defined(USE_NGTCP2) && defined(USE_NGHTTP3)) || \ |
30 | | defined(USE_QUICHE) || \ |
31 | | defined(USE_RUSTLS) |
32 | | |
33 | | #include "keylog.h" |
34 | | #include <curl/curl.h> |
35 | | #include "../escape.h" |
36 | | #include "../curlx/fopen.h" |
37 | | |
38 | | /* The last #include files should be: */ |
39 | | #include "../curl_memory.h" |
40 | | #include "../memdebug.h" |
41 | | |
42 | | /* The fp for the open SSLKEYLOGFILE, or NULL if not open */ |
43 | | static FILE *keylog_file_fp; |
44 | | |
45 | | void |
46 | | Curl_tls_keylog_open(void) |
47 | 0 | { |
48 | 0 | char *keylog_file_name; |
49 | |
|
50 | 0 | if(!keylog_file_fp) { |
51 | 0 | keylog_file_name = curl_getenv("SSLKEYLOGFILE"); |
52 | 0 | if(keylog_file_name) { |
53 | 0 | keylog_file_fp = curlx_fopen(keylog_file_name, FOPEN_APPENDTEXT); |
54 | 0 | if(keylog_file_fp) { |
55 | | #ifdef _WIN32 |
56 | | if(setvbuf(keylog_file_fp, NULL, _IONBF, 0)) |
57 | | #else |
58 | 0 | if(setvbuf(keylog_file_fp, NULL, _IOLBF, 4096)) |
59 | 0 | #endif |
60 | 0 | { |
61 | 0 | curlx_fclose(keylog_file_fp); |
62 | 0 | keylog_file_fp = NULL; |
63 | 0 | } |
64 | 0 | } |
65 | 0 | Curl_safefree(keylog_file_name); |
66 | 0 | } |
67 | 0 | } |
68 | 0 | } |
69 | | |
70 | | void |
71 | | Curl_tls_keylog_close(void) |
72 | 0 | { |
73 | 0 | if(keylog_file_fp) { |
74 | 0 | curlx_fclose(keylog_file_fp); |
75 | 0 | keylog_file_fp = NULL; |
76 | 0 | } |
77 | 0 | } |
78 | | |
79 | | bool |
80 | | Curl_tls_keylog_enabled(void) |
81 | 0 | { |
82 | 0 | return keylog_file_fp != NULL; |
83 | 0 | } |
84 | | |
85 | | bool |
86 | | Curl_tls_keylog_write_line(const char *line) |
87 | 0 | { |
88 | | /* The current maximum valid keylog line length LF and NUL is 195. */ |
89 | 0 | size_t linelen; |
90 | 0 | char buf[256]; |
91 | |
|
92 | 0 | if(!keylog_file_fp || !line) { |
93 | 0 | return FALSE; |
94 | 0 | } |
95 | | |
96 | 0 | linelen = strlen(line); |
97 | 0 | if(linelen == 0 || linelen > sizeof(buf) - 2) { |
98 | | /* Empty line or too big to fit in an LF and NUL. */ |
99 | 0 | return FALSE; |
100 | 0 | } |
101 | | |
102 | 0 | memcpy(buf, line, linelen); |
103 | 0 | if(line[linelen - 1] != '\n') { |
104 | 0 | buf[linelen++] = '\n'; |
105 | 0 | } |
106 | 0 | buf[linelen] = '\0'; |
107 | | |
108 | | /* Using fputs here instead of fprintf since libcurl's fprintf replacement |
109 | | may not be thread-safe. */ |
110 | 0 | fputs(buf, keylog_file_fp); |
111 | 0 | return TRUE; |
112 | 0 | } |
113 | | |
114 | | bool |
115 | | Curl_tls_keylog_write(const char *label, |
116 | | const unsigned char client_random[CLIENT_RANDOM_SIZE], |
117 | | const unsigned char *secret, size_t secretlen) |
118 | 0 | { |
119 | 0 | size_t pos, i; |
120 | 0 | unsigned char line[KEYLOG_LABEL_MAXLEN + 1 + 2 * CLIENT_RANDOM_SIZE + 1 + |
121 | 0 | 2 * SECRET_MAXLEN + 1 + 1]; |
122 | |
|
123 | 0 | if(!keylog_file_fp) { |
124 | 0 | return FALSE; |
125 | 0 | } |
126 | | |
127 | 0 | pos = strlen(label); |
128 | 0 | if(pos > KEYLOG_LABEL_MAXLEN || !secretlen || secretlen > SECRET_MAXLEN) { |
129 | | /* Should never happen - sanity check anyway. */ |
130 | 0 | return FALSE; |
131 | 0 | } |
132 | | |
133 | 0 | memcpy(line, label, pos); |
134 | 0 | line[pos++] = ' '; |
135 | | |
136 | | /* Client Random */ |
137 | 0 | for(i = 0; i < CLIENT_RANDOM_SIZE; i++) { |
138 | 0 | Curl_hexbyte(&line[pos], client_random[i]); |
139 | 0 | pos += 2; |
140 | 0 | } |
141 | 0 | line[pos++] = ' '; |
142 | | |
143 | | /* Secret */ |
144 | 0 | for(i = 0; i < secretlen; i++) { |
145 | 0 | Curl_hexbyte(&line[pos], secret[i]); |
146 | 0 | pos += 2; |
147 | 0 | } |
148 | 0 | line[pos++] = '\n'; |
149 | 0 | line[pos] = '\0'; |
150 | | |
151 | | /* Using fputs here instead of fprintf since libcurl's fprintf replacement |
152 | | may not be thread-safe. */ |
153 | 0 | fputs((char *)line, keylog_file_fp); |
154 | | return TRUE; |
155 | 0 | } |
156 | | |
157 | | #endif /* TLS or QUIC backend */ |