diff options
| author | Root THC | 2026-02-24 12:42:47 +0000 |
|---|---|---|
| committer | Root THC | 2026-02-24 12:42:47 +0000 |
| commit | c9cbeced5b3f2bdd7407e29c0811e65954132540 (patch) | |
| tree | aefc355416b561111819de159ccbd86c3004cf88 /other/sslmim/dca.cc | |
| parent | 073fe4bf9fca6bf40cef2886d75df832ef4b6fca (diff) | |
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| -rw-r--r-- | other/sslmim/dca.cc | 234 |
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diff --git a/other/sslmim/dca.cc b/other/sslmim/dca.cc new file mode 100644 index 0000000..9b42f0e --- /dev/null +++ b/other/sslmim/dca.cc | |||
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| 1 | /* | ||
| 2 | * Copyright (C) 2001 Sebastian Krahmer. | ||
| 3 | * All rights reserved. | ||
| 4 | * | ||
| 5 | * Redistribution and use in source and binary forms, with or without | ||
| 6 | * modification, are permitted provided that the following conditions | ||
| 7 | * are met: | ||
| 8 | * 1. Redistributions of source code must retain the above copyright | ||
| 9 | * notice, this list of conditions and the following disclaimer. | ||
| 10 | * 2. Redistributions in binary form must reproduce the above copyright | ||
| 11 | * notice, this list of conditions and the following disclaimer in the | ||
| 12 | * documentation and/or other materials provided with the distribution. | ||
| 13 | * 3. All advertising materials mentioning features or use of this software | ||
| 14 | * must display the following acknowledgement: | ||
| 15 | * This product includes software developed by Sebastian Krahmer. | ||
| 16 | * 4. The name Sebastian Krahmer may not be used to endorse or promote | ||
| 17 | * products derived from this software without specific prior written | ||
| 18 | * permission. | ||
| 19 | * | ||
| 20 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY | ||
| 21 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
| 22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | ||
| 23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE | ||
| 24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | ||
| 25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | ||
| 26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | ||
| 27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | ||
| 28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | ||
| 29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | ||
| 30 | * SUCH DAMAGE. | ||
| 31 | */ | ||
| 32 | #include "session.h" | ||
| 33 | #include "misc.h" | ||
| 34 | #include <stdio.h> | ||
| 35 | #include <string.h> | ||
| 36 | #include <sys/types.h> | ||
| 37 | #include <unistd.h> | ||
| 38 | #include <openssl/ssl.h> | ||
| 39 | #include <openssl/bio.h> | ||
| 40 | #include <openssl/asn1.h> | ||
| 41 | |||
| 42 | using namespace NS_Misc; | ||
| 43 | |||
| 44 | extern bool use_subject_for_issuer; | ||
| 45 | |||
| 46 | namespace NS_DCA { | ||
| 47 | |||
| 48 | #ifndef MBSTRING_ASC | ||
| 49 | #warning "You use outdated openssl lib." | ||
| 50 | #define MBSTRING_ASC (0x1000|1) | ||
| 51 | #endif | ||
| 52 | |||
| 53 | // Note that 'subject' can be actually an issuer too. | ||
| 54 | // both, subject and issuer change is done by that function | ||
| 55 | char *change_name(X509_NAME *subject, char *peer_subject, bool ca_team) | ||
| 56 | { | ||
| 57 | struct { | ||
| 58 | char C[256], ST[256], L[256], O[256], OU[256], | ||
| 59 | CN[256], Email[256]; | ||
| 60 | } sub; | ||
| 61 | int len = 0; | ||
| 62 | |||
| 63 | memset(&sub, 0, sizeof(sub)); | ||
| 64 | char *s = peer_subject; | ||
| 65 | |||
| 66 | // begin ugly parsing ... | ||
| 67 | if (strstr(s, "/C=")) { | ||
| 68 | s = strstr(s, "/C=") + 3; | ||
| 69 | len = strchr(s, '/') ? strchr(s, '/') - s : strlen(s); | ||
| 70 | memcpy(sub.C, s, len < 256 ? len : 255); | ||
| 71 | s += len; | ||
| 72 | } | ||
| 73 | if (strstr(s, "/ST=")) { | ||
| 74 | s = strstr(s, "/ST=") + 4; | ||
| 75 | len = strchr(s, '/') ? strchr(s, '/') - s : strlen(s); | ||
| 76 | memcpy(sub.ST, s, len < 256 ? len : 255); | ||
| 77 | s += len; | ||
| 78 | } | ||
| 79 | |||
| 80 | if (strstr(s, "/L=")) { | ||
| 81 | s = strstr(s, "/L=") + 3; | ||
| 82 | len = strchr(s, '/') ? strchr(s, '/') - s : strlen(s); | ||
| 83 | memcpy(sub.L, s, len < 256 ? len : 255); | ||
| 84 | s += len; | ||
| 85 | } | ||
| 86 | |||
| 87 | if (strstr(s, "/O=")) { | ||
| 88 | s = strstr(s, "/O=") + 3; | ||
| 89 | len = strchr(s, '/') ? strchr(s, '/') - s : strlen(s); | ||
| 90 | memcpy(sub.O, s, len < 256 ? len : 255); | ||
| 91 | s += len; | ||
| 92 | } | ||
| 93 | |||
| 94 | if (strstr(s, "/OU=")) { | ||
| 95 | s = strstr(s, "/OU=") + 4; | ||
| 96 | len = strchr(s, '/') ? strchr(s, '/') - s : strlen(s); | ||
| 97 | memcpy(sub.OU, s, len < 256 ? len : 255); | ||
| 98 | s += len; | ||
| 99 | } | ||
| 100 | |||
| 101 | if (strstr(s, "/CN=")) { | ||
| 102 | s = strstr(s, "/CN=") + 4; | ||
| 103 | len = strchr(s, '/') ? strchr(s, '/') - s : strlen(s); | ||
| 104 | memcpy(sub.CN, s, len < 256 ? len : 255); | ||
| 105 | s += len; | ||
| 106 | } | ||
| 107 | |||
| 108 | if (strstr(s, "/Email=")) { | ||
| 109 | s = strstr(s, "/Email=") + 7; | ||
| 110 | len = strchr(s, '/') ? strchr(s, '/') - s : strlen(s); | ||
| 111 | memcpy(sub.Email, s, len < 256 ? len : 255); | ||
| 112 | s += len; | ||
| 113 | } | ||
| 114 | |||
| 115 | if (sub.C[0]) | ||
| 116 | X509_NAME_add_entry_by_txt(subject,"C", | ||
| 117 | MBSTRING_ASC, (unsigned char*)sub.C, -1, -1, -1); | ||
| 118 | |||
| 119 | if (sub.ST[0]) | ||
| 120 | X509_NAME_add_entry_by_txt(subject,"ST", | ||
| 121 | MBSTRING_ASC, (unsigned char*)sub.ST, -1, -1, -1); | ||
| 122 | |||
| 123 | if (sub.L[0]) | ||
| 124 | X509_NAME_add_entry_by_txt(subject,"L", | ||
| 125 | MBSTRING_ASC, (unsigned char*)sub.L, -1, -1, -1); | ||
| 126 | |||
| 127 | if (sub.O[0]) | ||
| 128 | X509_NAME_add_entry_by_txt(subject,"O", | ||
| 129 | MBSTRING_ASC, (unsigned char*)sub.O, -1, -1, -1); | ||
| 130 | |||
| 131 | if (ca_team) { | ||
| 132 | char fake[1024]; | ||
| 133 | memset(fake, 0, sizeof(fake)); | ||
| 134 | snprintf(fake, sizeof(fake), "%s ", sub.OU); | ||
| 135 | X509_NAME_add_entry_by_txt(subject,"OU", | ||
| 136 | MBSTRING_ASC, (unsigned char*)fake, //"CA-Team", | ||
| 137 | -1, -1, -1); | ||
| 138 | } else { | ||
| 139 | X509_NAME_add_entry_by_txt(subject,"OU", | ||
| 140 | MBSTRING_ASC, (unsigned char*)sub.OU, | ||
| 141 | -1, -1, -1); | ||
| 142 | } | ||
| 143 | |||
| 144 | if (sub.CN[0]) | ||
| 145 | X509_NAME_add_entry_by_txt(subject,"CN", | ||
| 146 | MBSTRING_ASC, (unsigned char*)sub.CN, -1, -1, -1); | ||
| 147 | |||
| 148 | if (sub.Email[0]) | ||
| 149 | X509_NAME_add_entry_by_txt(subject,"Email", | ||
| 150 | MBSTRING_ASC, (unsigned char*)sub.Email, -1, -1, -1); | ||
| 151 | |||
| 152 | return strdup(sub.CN); | ||
| 153 | } | ||
| 154 | |||
| 155 | |||
| 156 | // Do the somewhat tricky dynamic certificate assembly | ||
| 157 | // which puts "apropriate" subject and public key into | ||
| 158 | // X509 cert. | ||
| 159 | int do_dca(CSession *client, SSession *server) | ||
| 160 | { | ||
| 161 | char l[1024]; | ||
| 162 | |||
| 163 | X509 *peer_cert = SSL_get_peer_certificate(client->ssl()); | ||
| 164 | |||
| 165 | if (!peer_cert) { | ||
| 166 | log("Nuts, no server-certificate"); | ||
| 167 | return 0; | ||
| 168 | } | ||
| 169 | |||
| 170 | char *peer_subject = X509_NAME_oneline( | ||
| 171 | X509_get_subject_name(peer_cert), NULL, 0); | ||
| 172 | char *peer_issuer = X509_NAME_oneline( | ||
| 173 | X509_get_issuer_name(peer_cert), NULL, 0); | ||
| 174 | |||
| 175 | log(peer_subject); | ||
| 176 | log(peer_issuer); | ||
| 177 | |||
| 178 | // name of algo which is used by server | ||
| 179 | // (WE are client, and so 'client' is connection | ||
| 180 | // to real server | ||
| 181 | const char *algo = SSL_get_cipher(client->ssl()); | ||
| 182 | |||
| 183 | snprintf(l, sizeof(l), "Using cipher %s", algo); | ||
| 184 | log(l); | ||
| 185 | |||
| 186 | // what we loaded with load_keys() | ||
| 187 | X509 *our_cert = SSL_get_certificate(server->ssl()); | ||
| 188 | |||
| 189 | X509_NAME *subject = X509_get_subject_name(our_cert); | ||
| 190 | X509_NAME *issuer = X509_get_issuer_name(our_cert); | ||
| 191 | |||
| 192 | // built our cert w/ subject of orig server | ||
| 193 | char *name = change_name(subject, peer_subject, 0); | ||
| 194 | X509_set_subject_name(our_cert, subject); | ||
| 195 | |||
| 196 | // if we must 'touch' issuer, we will adopt the | ||
| 197 | // the subject for the issuer, so that i.e. veri-signed | ||
| 198 | // cert's become self-signed :) | ||
| 199 | if (use_subject_for_issuer) | ||
| 200 | change_name(issuer, peer_subject, 1); | ||
| 201 | else | ||
| 202 | change_name(issuer, peer_issuer, 1); | ||
| 203 | |||
| 204 | X509_set_issuer_name(our_cert, issuer); | ||
| 205 | |||
| 206 | // finally, set serialnumber | ||
| 207 | ASN1_INTEGER *serial = X509_get_serialNumber(peer_cert); | ||
| 208 | |||
| 209 | |||
| 210 | if (serial) | ||
| 211 | X509_set_serialNumber(our_cert, serial); | ||
| 212 | else | ||
| 213 | log("Nuts, no serialnumber!"); | ||
| 214 | |||
| 215 | if (name) { | ||
| 216 | // save fake-cert | ||
| 217 | char save_cert[1024]; | ||
| 218 | snprintf(save_cert, sizeof(save_cert), "./cert_of_%s.%d", | ||
| 219 | name, getpid()); | ||
| 220 | |||
| 221 | FILE *f = fopen(save_cert, "w+"); | ||
| 222 | if (!f) | ||
| 223 | return 0; | ||
| 224 | BIO *bio = BIO_new_fp(f, 0); | ||
| 225 | PEM_write_bio_X509(bio, our_cert); | ||
| 226 | BIO_flush(bio); | ||
| 227 | fclose(f); | ||
| 228 | free(name); | ||
| 229 | } | ||
| 230 | return 0; | ||
| 231 | } | ||
| 232 | |||
| 233 | }; // namespace NS_DCA | ||
| 234 | |||
