src/ssl/cert_validate_message.cc

   1 #include "squid.h"
   2 #include "acl/FilledChecklist.h"
   3 #include "ssl/support.h"
   4 #include "ssl/cert_validate_message.h"
   5 #include "ssl/ErrorDetail.h"
   6
   7
   8 void
   9 Ssl::CertValidationMsg::composeRequest(CertValidationRequest const &vcert)
  10 {
  11     body.clear();
  12     body += Ssl::CertValidationMsg::param_host + "=" + vcert.domainName;
  13     if (vcert.errors) {
  14         body += "\n" + Ssl::CertValidationMsg::param_error + "=";
  15         bool comma = false;
  16         for (const Ssl::Errors *err = vcert.errors; err; err = err->next ) {
  17             if (comma)
  18                 body += ",";
  19             body += GetErrorName(err->element);
  20             comma = true;
  21         }
  22     }
  23
  24     if (vcert.peerCerts) {
  25         body +="\n";
  26         Ssl::BIO_Pointer bio(BIO_new(BIO_s_mem()));
  27         for (int i = 0; i < sk_X509_num(vcert.peerCerts); ++i) {
  28             X509 *cert = sk_X509_value(vcert.peerCerts, i);
  29             PEM_write_bio_X509(bio.get(), cert);
  30             body = body + "cert_" + xitoa(i) + "=";
  31             char *ptr;
  32             long len = BIO_get_mem_data(bio.get(), &ptr);
  33             body.append(ptr, len);
  34             // Normally openssl toolkit terminates Certificate with a '\n'.
  35             if (ptr[len-1] != '\n')
  36                 body +="\n";
  37             if (!BIO_reset(bio.get())) {
  38                 // print an error?
  39             }
  40         }
  41     }
  42 }
  43
  44 static int
  45 get_error_id(const char *label, size_t len)
  46 {
  47     const char *e = label + len -1;
  48     while (e != label && xisdigit(*e)) --e;
  49     if (e != label) ++e;
  50     return strtol(e, 0 , 10);
  51 }
  52
  53 bool
  54 Ssl::CertValidationMsg::parseResponse(CertValidationResponse &resp, STACK_OF(X509) *peerCerts, std::string &error)
  55 {
  56     std::vector<CertItem> certs;
  57
  58     const char *param = body.c_str();
  59     while(*param) {
  60         while(xisspace(*param)) param++;
  61         if (! *param)
  62             break;
  63
  64         size_t param_len = strcspn(param, "=\r\n");
  65         if (param[param_len] !=  '=') {
  66             debugs(83, 2, "Cert validator response parse error: " << param);
  67             return false;
  68         }
  69         const char *value=param+param_len+1;
  70
  71         if (param_len > param_cert.length() &&
  72             strncmp(param, param_cert.c_str(), param_cert.length()) == 0) {
  73             CertItem ci;
  74             ci.name.assign(param, param_len);
  75             X509_Pointer x509;
  76             readCertFromMemory(x509, value);
  77             ci.setCert(x509.get());
  78             certs.push_back(ci);
  79
  80             const char *b = strstr(value, "-----END CERTIFICATE-----");
  81             if (b == NULL) {
  82                 debugs(83, 2, "Cert Vailidator response parse error: Failed  to find certificate boundary " << value);
  83                 return false;
  84             }
  85             b += strlen("-----END CERTIFICATE-----");
  86             param = b + 1;
  87             continue;
  88         }
  89
  90         size_t value_len = strcspn(value, "\r\n");
  91         std::string v(value, value_len);
  92
  93         debugs(83, 5, HERE << "Returned value: " << std::string(param, param_len).c_str() << ": " <<
  94                v.c_str());
  95
  96         int errorId = get_error_id(param, param_len);
  97         Ssl::CertValidationResponse::RecvdError &currentItem = resp.getError(errorId);
  98
  99         if (param_len > param_error_name.length() &&
 100             strncmp(param, param_error_name.c_str(), param_error_name.length()) == 0){
 101             currentItem.error_no = Ssl::GetErrorCode(v.c_str());
 102             if (currentItem.error_no == SSL_ERROR_NONE) {
 103                 debugs(83, 2, "Cert validator response parse error: Unknown SSL Error: " << v);
 104                 return false;
 105             }
 106         } else if (param_len > param_error_reason.length() &&
 107                    strncmp(param, param_error_reason.c_str(), param_error_reason.length()) == 0) {
 108             currentItem.error_reason = v;
 109         } else if (param_len > param_error_cert.length() &&
 110                    strncmp(param, param_error_cert.c_str(), param_error_cert.length()) == 0) {
 111
 112             if (X509 *cert = getCertByName(certs, v)) {
 113                 debugs(83, 6, HERE << "The certificate with id \"" << v << "\" found.");
 114                 currentItem.setCert(cert);
 115             } else {
 116                 //In this case we assume that the certID is one of the certificates sent
 117                 // to cert validator. The certificates sent to cert validator have names in
 118                 // form "cert_xx" where the "xx" is an integer represents the position of
 119                 // the certificate inside peer certificates list.
 120                 const int certId = get_error_id(v.c_str(), v.length());
 121                 debugs(83, 6, HERE << "Cert index in peer certificates list:" << certId);
 122                 //if certId is not correct sk_X509_value returns NULL
 123                 currentItem.setCert(sk_X509_value(peerCerts, certId));
 124             }
 125         } else {
 126             debugs(83, 2, "Cert validator response parse error: Unknown parameter name " << std::string(param, param_len).c_str());
 127             return false;
 128         }
 129
 130
 131         param = value + value_len +1;
 132     }
 133
 134     /*Run through parsed errors to check for errors*/
 135
 136     return true;
 137 }
 138
 139 X509 *
 140 Ssl::CertValidationMsg::getCertByName(std::vector<CertItem> const &certs, std::string const & name)
 141 {
 142     for (std::vector<CertItem>::const_iterator ci = certs.begin(); ci != certs.end(); ++ci) {
 143         if (ci->name.compare(name) == 0)
 144             return ci->cert;
 145     }
 146     return NULL;
 147 }
 148
 149 Ssl::CertValidationResponse::RecvdError &
 150 Ssl::CertValidationResponse::getError(int errorId)
 151 {
 152     for(Ssl::CertValidationResponse::RecvdErrors::iterator i = errors.begin(); i != errors.end(); ++i){
 153         if (i->id == errorId)
 154             return *i;
 155     }
 156     Ssl::CertValidationResponse::RecvdError errItem;
 157     errItem.id = errorId;
 158     errors.push_back(errItem);
 159     return errors.back();
 160 }
 161
 162 Ssl::CertValidationResponse::RecvdError::RecvdError(const RecvdError &old) {
 163     error_no = old.error_no;
 164     error_reason = old.error_reason;
 165     cert = NULL;
 166     setCert(old.cert);
 167 }
 168
 169 Ssl::CertValidationResponse::RecvdError::~RecvdError() {
 170     if (cert)
 171         X509_free(cert);
 172 }
 173
 174 Ssl::CertValidationResponse::RecvdError & Ssl::CertValidationResponse::RecvdError::operator = (const RecvdError &old) {
 175     error_no = old.error_no;
 176     error_reason = old.error_reason;
 177     setCert(old.cert);
 178     return *this;
 179 }
 180
 181 void
 182 Ssl::CertValidationResponse::RecvdError::setCert(X509 *aCert) {
 183     if (cert)
 184         X509_free(cert);
 185     if (aCert) {
 186         cert = aCert;
 187         CRYPTO_add(&cert->references, 1, CRYPTO_LOCK_X509);
 188     } else
 189         cert = NULL;
 190 }
 191
 192 Ssl::CertValidationMsg::CertItem::CertItem(const CertItem &old)
 193 {
 194     name = old.name;
 195     cert = NULL;
 196     setCert(old.cert);
 197 }
 198
 199 Ssl::CertValidationMsg::CertItem & Ssl::CertValidationMsg::CertItem::operator = (const CertItem &old)
 200 {
 201     name = old.name;
 202     setCert(old.cert);
 203     return *this;
 204 }
 205
 206 Ssl::CertValidationMsg::CertItem::~CertItem()
 207 {
 208     if (cert)
 209         X509_free(cert);
 210 }
 211
 212 void
 213 Ssl::CertValidationMsg::CertItem::setCert(X509 *aCert)
 214 {
 215     if (cert)
 216         X509_free(cert);
 217     if (aCert) {
 218         cert = aCert;
 219         CRYPTO_add(&cert->references, 1, CRYPTO_LOCK_X509);
 220     } else
 221         cert = NULL;
 222 }
 223
 224 const std::string Ssl::CertValidationMsg::code_cert_validate("cert_validate");
 225 const std::string Ssl::CertValidationMsg::param_domain("domain");
 226 const std::string Ssl::CertValidationMsg::param_error("errors");
 227 const std::string Ssl::CertValidationMsg::param_cert("cert_");
 228 const std::string Ssl::CertValidationMsg::param_error_name("error_name_");
 229 const std::string Ssl::CertValidationMsg::param_error_reason("error_reason_");
 230 const std::string Ssl::CertValidationMsg::param_error_cert("error_cert_");
 231