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 void
   8 Ssl::CertValidationMsg::composeRequest(CertValidationRequest const &vcert)
   9 {
  10     body.clear();
  11     body += Ssl::CertValidationMsg::param_host + "=" + vcert.domainName;
  12     if (vcert.errors) {
  13         body += "\n" + Ssl::CertValidationMsg::param_error + "=";
  14         bool comma = false;
  15         for (const Ssl::Errors *err = vcert.errors; err; err = err->next ) {
  16             if (comma)
  17                 body += ",";
  18             body += GetErrorName(err->element);
  19             comma = true;
  20         }
  21     }
  22
  23     STACK_OF(X509) *peerCerts = SSL_get_peer_cert_chain(vcert.ssl);
  24     if (peerCerts) {
  25         body +="\n";
  26         Ssl::BIO_Pointer bio(BIO_new(BIO_s_mem()));
  27         for (int i = 0; i < sk_X509_num(peerCerts); ++i) {
  28             X509 *cert = sk_X509_value(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, DBG_IMPORTANT, "WARNING: 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, DBG_IMPORTANT, "WARNING: cert Validator 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, "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, DBG_IMPORTANT, "WARNING: 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, "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, "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, DBG_IMPORTANT, "WARNING: cert validator response parse error: Unknown parameter name " << std::string(param, param_len).c_str());
 127             return false;
 128         }
 129
 130         param = value + value_len +1;
 131     }
 132
 133     /*Run through parsed errors to check for errors*/
 134     typedef Ssl::CertValidationResponse::RecvdErrors::const_iterator SVCRECI;
 135     for (SVCRECI i = resp.errors.begin(); i != resp.errors.end(); ++i) {
 136         if (i->error_no == SSL_ERROR_NONE) {
 137             debugs(83, DBG_IMPORTANT, "WARNING: cert validator incomplete response: Missing error name from error_id: " << i->id);
 138             return false;
 139         }
 140     }
 141
 142     return true;
 143 }
 144
 145 X509 *
 146 Ssl::CertValidationMsg::getCertByName(std::vector<CertItem> const &certs, std::string const & name)
 147 {
 148     typedef std::vector<CertItem>::const_iterator SVCI;
 149     for (SVCI ci = certs.begin(); ci != certs.end(); ++ci) {
 150         if (ci->name.compare(name) == 0)
 151             return ci->cert.get();
 152     }
 153     return NULL;
 154 }
 155
 156 Ssl::CertValidationResponse::RecvdError &
 157 Ssl::CertValidationResponse::getError(int errorId)
 158 {
 159     typedef Ssl::CertValidationResponse::RecvdErrors::iterator SVCREI;
 160     for (SVCREI i = errors.begin(); i != errors.end(); ++i) {
 161         if (i->id == errorId)
 162             return *i;
 163     }
 164     Ssl::CertValidationResponse::RecvdError errItem;
 165     errItem.id = errorId;
 166     errors.push_back(errItem);
 167     return errors.back();
 168 }
 169
 170 Ssl::CertValidationResponse::RecvdError::RecvdError(const RecvdError &old)
 171 {
 172     id = old.id;
 173     error_no = old.error_no;
 174     error_reason = old.error_reason;
 175     setCert(old.cert.get());
 176 }
 177
 178 Ssl::CertValidationResponse::RecvdError & Ssl::CertValidationResponse::RecvdError::operator = (const RecvdError &old)
 179 {
 180     id = old.id;
 181     error_no = old.error_no;
 182     error_reason = old.error_reason;
 183     setCert(old.cert.get());
 184     return *this;
 185 }
 186
 187 void
 188 Ssl::CertValidationResponse::RecvdError::setCert(X509 *aCert)
 189 {
 190     cert.resetAndLock(aCert);
 191 }
 192
 193 Ssl::CertValidationMsg::CertItem::CertItem(const CertItem &old)
 194 {
 195     name = old.name;
 196     setCert(old.cert.get());
 197 }
 198
 199 Ssl::CertValidationMsg::CertItem & Ssl::CertValidationMsg::CertItem::operator = (const CertItem &old)
 200 {
 201     name = old.name;
 202     setCert(old.cert.get());
 203     return *this;
 204 }
 205
 206 void
 207 Ssl::CertValidationMsg::CertItem::setCert(X509 *aCert)
 208 {
 209     cert.resetAndLock(aCert);
 210 }
 211
 212 const std::string Ssl::CertValidationMsg::code_cert_validate("cert_validate");
 213 const std::string Ssl::CertValidationMsg::param_domain("domain");
 214 const std::string Ssl::CertValidationMsg::param_error("errors");
 215 const std::string Ssl::CertValidationMsg::param_cert("cert_");
 216 const std::string Ssl::CertValidationMsg::param_error_name("error_name_");
 217 const std::string Ssl::CertValidationMsg::param_error_reason("error_reason_");
 218 const std::string Ssl::CertValidationMsg::param_error_cert("error_cert_");
 219