src/ssl/crtd_message.cc

   1 /*
   2  * Copyright (C) 1996-2025 The Squid Software Foundation and contributors
   3  *
   4  * Squid software is distributed under GPLv2+ license and includes
   5  * contributions from numerous individuals and organizations.
   6  * Please see the COPYING and CONTRIBUTORS files for details.
   7  */
   8
   9 #include "squid.h"
  10 #include "base/TextException.h"
  11 #include "sbuf/Stream.h"
  12 #include "ssl/crtd_message.h"
  13 #include "ssl/gadgets.h"
  14
  15 #include <cstdlib>
  16 #include <cstring>
  17 #include <stdexcept>
  18
  19 Ssl::CrtdMessage::CrtdMessage(MessageKind kind)
  20     :   body_size(0), state(kind == REPLY ? BEFORE_LENGTH: BEFORE_CODE)
  21 {}
  22
  23 Ssl::CrtdMessage::ParseResult Ssl::CrtdMessage::parse(const char * buffer, size_t len)
  24 {
  25     char const *current_pos = buffer;
  26     while (current_pos != buffer + len && state != END) {
  27         switch (state) {
  28         case BEFORE_CODE: {
  29             if (xisspace(*current_pos)) {
  30                 ++current_pos;
  31                 break;
  32             }
  33             if (xisalpha(*current_pos)) {
  34                 state = CODE;
  35                 break;
  36             }
  37             clear();
  38             return ERROR;
  39         }
  40         case CODE: {
  41             if (xisalnum(*current_pos) || *current_pos == '_') {
  42                 current_block += *current_pos;
  43                 ++current_pos;
  44                 break;
  45             }
  46             if (xisspace(*current_pos)) {
  47                 code = current_block;
  48                 current_block.clear();
  49                 state = BEFORE_LENGTH;
  50                 break;
  51             }
  52             clear();
  53             return ERROR;
  54         }
  55         case BEFORE_LENGTH: {
  56             if (xisspace(*current_pos)) {
  57                 ++current_pos;
  58                 break;
  59             }
  60             if (xisdigit(*current_pos)) {
  61                 state = LENGTH;
  62                 break;
  63             }
  64             clear();
  65             return ERROR;
  66         }
  67         case LENGTH: {
  68             if (xisdigit(*current_pos)) {
  69                 current_block += *current_pos;
  70                 ++current_pos;
  71                 break;
  72             }
  73             if (xisspace(*current_pos)) {
  74                 body_size = atoi(current_block.c_str());
  75                 current_block.clear();
  76                 state = BEFORE_BODY;
  77                 break;
  78             }
  79             clear();
  80             return ERROR;
  81         }
  82         case BEFORE_BODY: {
  83             if (body_size == 0) {
  84                 state = END;
  85                 break;
  86             }
  87             if (xisspace(*current_pos)) {
  88                 ++current_pos;
  89                 break;
  90             } else {
  91                 state = BODY;
  92                 break;
  93             }
  94         }
  95         case BODY: {
  96             size_t body_len = (static_cast<size_t>(buffer + len - current_pos) >= body_size - current_block.length())
  97                               ? body_size - current_block.length()
  98                               : static_cast<size_t>(buffer + len - current_pos);
  99             current_block += std::string(current_pos, body_len);
 100             current_pos += body_len;
 101             if (current_block.length() == body_size) {
 102                 body = current_block;
 103                 state = END;
 104             }
 105             if (current_block.length() > body_size) {
 106                 clear();
 107                 return ERROR;
 108             }
 109             break;
 110         }
 111         case END: {
 112             return OK;
 113         }
 114         }
 115     }
 116     if (state != END) return INCOMPLETE;
 117     return OK;
 118 }
 119
 120 std::string const & Ssl::CrtdMessage::getBody() const { return body; }
 121
 122 std::string const & Ssl::CrtdMessage::getCode() const { return code; }
 123
 124 void Ssl::CrtdMessage::setBody(std::string const & aBody) { body = aBody; }
 125
 126 void Ssl::CrtdMessage::setCode(std::string const & aCode) { code = aCode; }
 127
 128 std::string Ssl::CrtdMessage::compose() const
 129 {
 130     if (code.empty()) return std::string();
 131     return code + ' ' + std::to_string(body.length()) + ' ' + body;
 132 }
 133
 134 void Ssl::CrtdMessage::clear()
 135 {
 136     body_size = 0;
 137     state = BEFORE_CODE;
 138     body.clear();
 139     code.clear();
 140     current_block.clear();
 141 }
 142
 143 void Ssl::CrtdMessage::parseBody(CrtdMessage::BodyParams & map, std::string & other_part) const
 144 {
 145     other_part.clear();
 146     // Copy string for using it as temp buffer.
 147     std::string temp_body(body.c_str(), body.length());
 148     char * buffer = const_cast<char *>(temp_body.c_str());
 149     char * token = strtok(buffer, "\r\n");
 150     while (token != nullptr) {
 151         std::string current_string(token);
 152         size_t equal_pos = current_string.find('=');
 153         if (equal_pos == std::string::npos) {
 154             size_t offset_body_part = token - temp_body.c_str();
 155             other_part = std::string(body.c_str() + offset_body_part, body.length() - offset_body_part);
 156             break;
 157         } else {
 158             std::string param(current_string.c_str(), current_string.c_str() + equal_pos);
 159             std::string value(current_string.c_str() + equal_pos + 1);
 160             map.insert(std::make_pair(param, value));
 161         }
 162         token = strtok(nullptr, "\r\n");
 163     }
 164 }
 165
 166 void Ssl::CrtdMessage::composeBody(CrtdMessage::BodyParams const & map, std::string const & other_part)
 167 {
 168     body.clear();
 169     for (BodyParams::const_iterator i = map.begin(); i != map.end(); ++i) {
 170         if (i != map.begin())
 171             body += "\n";
 172         body += i->first + "=" + i->second;
 173     }
 174     if (!other_part.empty())
 175         body += '\n' + other_part;
 176 }
 177
 178 void
 179 Ssl::CrtdMessage::parseRequest(CertificateProperties &certProperties)
 180 {
 181     Ssl::CrtdMessage::BodyParams map;
 182     std::string certs_part;
 183     parseBody(map, certs_part);
 184     Ssl::CrtdMessage::BodyParams::iterator i = map.find(Ssl::CrtdMessage::param_host);
 185     if (i == map.end()) {
 186         throw TextException("Cannot find \"host\" parameter in request message", Here());
 187     }
 188     certProperties.commonName = i->second;
 189
 190     i = map.find(Ssl::CrtdMessage::param_SetValidAfter);
 191     if (i != map.end() && strcasecmp(i->second.c_str(), "on") == 0)
 192         certProperties.setValidAfter = true;
 193
 194     i = map.find(Ssl::CrtdMessage::param_SetValidBefore);
 195     if (i != map.end() && strcasecmp(i->second.c_str(), "on") == 0)
 196         certProperties.setValidBefore = true;
 197
 198     i = map.find(Ssl::CrtdMessage::param_SetCommonName);
 199     if (i != map.end()) {
 200         // use this as Common Name  instead of the hostname
 201         // defined with host or Common Name from mimic cert
 202         certProperties.commonName = i->second;
 203         certProperties.setCommonName = true;
 204     }
 205
 206     i = map.find(Ssl::CrtdMessage::param_Sign);
 207     if (i != map.end()) {
 208         if ((certProperties.signAlgorithm = Ssl::certSignAlgorithmId(i->second.c_str())) == Ssl::algSignEnd) {
 209             throw TextException(ToSBuf("Wrong signing algorithm: ", i->second), Here());
 210         }
 211     } else
 212         certProperties.signAlgorithm = Ssl::algSignTrusted;
 213
 214     i = map.find(Ssl::CrtdMessage::param_SignHash);
 215     const char *signHashName = i != map.end() ? i->second.c_str() : SQUID_SSL_SIGN_HASH_IF_NONE;
 216     if (!(certProperties.signHash = EVP_get_digestbyname(signHashName))) {
 217         throw TextException(ToSBuf("Wrong signing hash: ", signHashName), Here());
 218     }
 219
 220     if (!Ssl::readCertAndPrivateKeyFromMemory(certProperties.signWithX509, certProperties.signWithPkey, certs_part.c_str())) {
 221         throw TextException("Broken signing certificate!", Here());
 222     }
 223
 224     static const std::string CERT_BEGIN_STR("-----BEGIN CERTIFICATE");
 225     size_t pos;
 226     if ((pos = certs_part.find(CERT_BEGIN_STR)) != std::string::npos) {
 227         pos += CERT_BEGIN_STR.length();
 228         if ((pos= certs_part.find(CERT_BEGIN_STR, pos)) != std::string::npos)
 229             certProperties.mimicCert = ReadCertificate(ReadOnlyBioTiedTo(certs_part.c_str() + pos));
 230     }
 231 }
 232
 233 void Ssl::CrtdMessage::composeRequest(Ssl::CertificateProperties const &certProperties)
 234 {
 235     body.clear();
 236     body = Ssl::CrtdMessage::param_host + "=" + certProperties.commonName;
 237     if (certProperties.setCommonName)
 238         body +=  "\n" + Ssl::CrtdMessage::param_SetCommonName + "=" + certProperties.commonName;
 239     if (certProperties.setValidAfter)
 240         body +=  "\n" + Ssl::CrtdMessage::param_SetValidAfter + "=on";
 241     if (certProperties.setValidBefore)
 242         body +=  "\n" + Ssl::CrtdMessage::param_SetValidBefore + "=on";
 243     if (certProperties.signAlgorithm != Ssl::algSignEnd)
 244         body +=  "\n" +  Ssl::CrtdMessage::param_Sign + "=" +  certSignAlgorithm(certProperties.signAlgorithm);
 245     if (certProperties.signHash)
 246         body +=  "\n" + Ssl::CrtdMessage::param_SignHash + "=" + EVP_MD_name(certProperties.signHash);
 247
 248     std::string certsPart;
 249     if (!Ssl::writeCertAndPrivateKeyToMemory(certProperties.signWithX509, certProperties.signWithPkey, certsPart))
 250         throw TextException("Ssl::writeCertAndPrivateKeyToMemory()", Here());
 251     if (certProperties.mimicCert.get()) {
 252         if (!Ssl::appendCertToMemory(certProperties.mimicCert, certsPart))
 253             throw TextException("Ssl::appendCertToMemory()", Here());
 254     }
 255     body += "\n" + certsPart;
 256 }
 257
 258 const std::string Ssl::CrtdMessage::code_new_certificate("new_certificate");
 259 const std::string Ssl::CrtdMessage::param_host("host");
 260 const std::string Ssl::CrtdMessage::param_SetValidAfter(Ssl::CertAdaptAlgorithmStr[algSetValidAfter]);
 261 const std::string Ssl::CrtdMessage::param_SetValidBefore(Ssl::CertAdaptAlgorithmStr[algSetValidBefore]);
 262 const std::string Ssl::CrtdMessage::param_SetCommonName(Ssl::CertAdaptAlgorithmStr[algSetCommonName]);
 263 const std::string Ssl::CrtdMessage::param_Sign("Sign");
 264 const std::string Ssl::CrtdMessage::param_SignHash("SignHash");
 265