/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 | | #include "vtls/keylog.h" |
26 | | |
27 | | #if defined(USE_OPENSSL) || defined(USE_GNUTLS) || defined(USE_WOLFSSL) || \ |
28 | | defined(USE_RUSTLS) |
29 | | |
30 | | #include "escape.h" |
31 | | #include "curlx/fopen.h" |
32 | | |
33 | | /* The fp for the open SSLKEYLOGFILE, or NULL if not open */ |
34 | | static FILE *keylog_file_fp; |
35 | | /* Used for verbose logging */ |
36 | | static char *keylog_file_name; |
37 | | |
38 | | void Curl_tls_keylog_open(void) |
39 | 18 | { |
40 | 18 | if(!keylog_file_fp) { |
41 | 18 | keylog_file_name = getenv("SSLKEYLOGFILE"); |
42 | 18 | if(keylog_file_name) { |
43 | 0 | keylog_file_fp = curlx_fopen(keylog_file_name, FOPEN_APPENDTEXT); |
44 | 0 | if(keylog_file_fp) { |
45 | | #ifdef _WIN32 |
46 | | if(setvbuf(keylog_file_fp, NULL, _IONBF, 0)) |
47 | | #else |
48 | 0 | if(setvbuf(keylog_file_fp, NULL, _IOLBF, 4096)) |
49 | 0 | #endif |
50 | 0 | { |
51 | 0 | curlx_fclose(keylog_file_fp); |
52 | 0 | keylog_file_fp = NULL; |
53 | 0 | } |
54 | 0 | } |
55 | 0 | } |
56 | 18 | } |
57 | 18 | } |
58 | | |
59 | | void Curl_tls_keylog_close(void) |
60 | 0 | { |
61 | 0 | if(keylog_file_fp) { |
62 | 0 | curlx_fclose(keylog_file_fp); |
63 | 0 | keylog_file_fp = NULL; |
64 | 0 | } |
65 | 0 | } |
66 | | |
67 | | bool Curl_tls_keylog_enabled(void) |
68 | 22.7k | { |
69 | 22.7k | return keylog_file_fp != NULL; |
70 | 22.7k | } |
71 | | |
72 | | const char *Curl_tls_keylog_file_name(void) |
73 | 0 | { |
74 | 0 | return keylog_file_name; |
75 | 0 | } |
76 | | |
77 | | bool Curl_tls_keylog_write_line(const char *line) |
78 | 0 | { |
79 | | /* The current maximum valid keylog line length LF and NUL is 195. */ |
80 | 0 | size_t linelen; |
81 | 0 | char buf[256]; |
82 | |
|
83 | 0 | if(!keylog_file_fp || !line) { |
84 | 0 | return FALSE; |
85 | 0 | } |
86 | | |
87 | 0 | linelen = strlen(line); |
88 | 0 | if(linelen == 0 || linelen > sizeof(buf) - 2) { |
89 | | /* Empty line or too big to fit in an LF and NUL. */ |
90 | 0 | return FALSE; |
91 | 0 | } |
92 | | |
93 | 0 | memcpy(buf, line, linelen); |
94 | 0 | if(line[linelen - 1] != '\n') { |
95 | 0 | buf[linelen++] = '\n'; |
96 | 0 | } |
97 | 0 | buf[linelen] = '\0'; |
98 | | |
99 | | /* Using fputs here instead of fprintf since libcurl's fprintf replacement |
100 | | may not be thread-safe. */ |
101 | 0 | fputs(buf, keylog_file_fp); |
102 | 0 | return TRUE; |
103 | 0 | } |
104 | | |
105 | | bool Curl_tls_keylog_write(const char *label, |
106 | | const unsigned char client_random[CLIENT_RANDOM_SIZE], |
107 | | const unsigned char *secret, size_t secretlen) |
108 | 0 | { |
109 | 0 | size_t pos, i; |
110 | 0 | unsigned char line[KEYLOG_LABEL_MAXLEN + 1 + |
111 | 0 | (2 * CLIENT_RANDOM_SIZE) + 1 + |
112 | 0 | (2 * SECRET_MAXLEN) + 1 + 1]; |
113 | |
|
114 | 0 | if(!keylog_file_fp) { |
115 | 0 | return FALSE; |
116 | 0 | } |
117 | | |
118 | 0 | pos = strlen(label); |
119 | 0 | if(pos > KEYLOG_LABEL_MAXLEN || !secretlen || secretlen > SECRET_MAXLEN) { |
120 | | /* Should never happen - sanity check anyway. */ |
121 | 0 | return FALSE; |
122 | 0 | } |
123 | | |
124 | 0 | memcpy(line, label, pos); |
125 | 0 | line[pos++] = ' '; |
126 | | |
127 | | /* Client Random */ |
128 | 0 | for(i = 0; i < CLIENT_RANDOM_SIZE; i++) { |
129 | 0 | Curl_hexbyte(&line[pos], client_random[i]); |
130 | 0 | pos += 2; |
131 | 0 | } |
132 | 0 | line[pos++] = ' '; |
133 | | |
134 | | /* Secret */ |
135 | 0 | for(i = 0; i < secretlen; i++) { |
136 | 0 | Curl_hexbyte(&line[pos], secret[i]); |
137 | 0 | pos += 2; |
138 | 0 | } |
139 | 0 | line[pos++] = '\n'; |
140 | 0 | line[pos] = '\0'; |
141 | | |
142 | | /* Using fputs here instead of fprintf since libcurl's fprintf replacement |
143 | | may not be thread-safe. */ |
144 | 0 | fputs((char *)line, keylog_file_fp); |
145 | | return TRUE; |
146 | 0 | } |
147 | | |
148 | | #else /* TLS backend */ |
149 | | |
150 | | bool Curl_tls_keylog_enabled(void) |
151 | | { |
152 | | return FALSE; |
153 | | } |
154 | | |
155 | | const char *Curl_tls_keylog_file_name(void) |
156 | | { |
157 | | return NULL; |
158 | | } |
159 | | |
160 | | #endif /* TLS backend */ |