--- /dev/null
+/*
+ * TLS support code for CUPS using GNU TLS.
+ *
+ * Copyright © 2020-2022 by OpenPrinting
+ * Copyright © 2007-2019 by Apple Inc.
+ * Copyright © 1997-2007 by Easy Software Products, all rights reserved.
+ *
+ * Licensed under Apache License v2.0. See the file "LICENSE" for more
+ * information.
+ */
+
+/**** This file is included from tls.c ****/
+
+/*
+ * Include necessary headers...
+ */
+
+#include <sys/stat.h>
+
+
+/*
+ * Local globals...
+ */
+
+static int tls_auto_create = 0;
+ /* Auto-create self-signed certs? */
+static char *tls_common_name = NULL;
+ /* Default common name */
+static X509_CRL *tls_crl = NULL;/* Certificate revocation list */
+static char *tls_keypath = NULL;
+ /* Server cert keychain path */
+static _cups_mutex_t tls_mutex = _CUPS_MUTEX_INITIALIZER;
+ /* Mutex for keychain/certs */
+static int tls_options = -1,/* Options for TLS connections */
+ tls_min_version = _HTTP_TLS_1_0,
+ tls_max_version = _HTTP_TLS_MAX;
+
+
+/*
+ * Local functions...
+ */
+
+static X509 *http_openssl_create_credential(http_credential_t *credential);
+static const char *http_openssl_default_path(char *buffer, size_t bufsize);
+static void http_openssl_load_crl(void);
+static const char *http_openssl_make_path(char *buffer, size_t bufsize, const char *dirname, const char *filename, const char *ext);
+static ssize_t http_openssl_read(openssl_transport_ptr_t ptr, void *data, size_t length);
+static ssize_t http_openssl_write(openssl_transport_ptr_t ptr, const void *data, size_t length);
+
+
+/*
+ * 'cupsMakeServerCredentials()' - Make a self-signed certificate and private key pair.
+ *
+ * @since CUPS 2.0/OS 10.10@
+ */
+
+int /* O - 1 on success, 0 on failure */
+cupsMakeServerCredentials(
+ const char *path, /* I - Path to keychain/directory */
+ const char *common_name, /* I - Common name */
+ int num_alt_names, /* I - Number of subject alternate names */
+ const char **alt_names, /* I - Subject Alternate Names */
+ time_t expiration_date) /* I - Expiration date */
+{
+ openssl_x509_crt_t crt; /* Self-signed certificate */
+ openssl_x509_privkey_t key; /* Encryption private key */
+ char temp[1024], /* Temporary directory name */
+ crtfile[1024], /* Certificate filename */
+ keyfile[1024]; /* Private key filename */
+ cups_lang_t *language; /* Default language info */
+ cups_file_t *fp; /* Key/cert file */
+ unsigned char buffer[8192]; /* Buffer for x509 data */
+ size_t bytes; /* Number of bytes of data */
+ unsigned char serial[4]; /* Serial number buffer */
+ time_t curtime; /* Current time */
+ int result; /* Result of GNU TLS calls */
+
+
+ DEBUG_printf(("cupsMakeServerCredentials(path=\"%s\", common_name=\"%s\", num_alt_names=%d, alt_names=%p, expiration_date=%d)", path, common_name, num_alt_names, alt_names, (int)expiration_date));
+
+ /*
+ * Filenames...
+ */
+
+ if (!path)
+ path = http_openssl_default_path(temp, sizeof(temp));
+
+ if (!path || !common_name)
+ {
+ _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(EINVAL), 0);
+ return (0);
+ }
+
+ http_openssl_make_path(crtfile, sizeof(crtfile), path, common_name, "crt");
+ http_openssl_make_path(keyfile, sizeof(keyfile), path, common_name, "key");
+
+ /*
+ * Create the encryption key...
+ */
+
+ DEBUG_puts("1cupsMakeServerCredentials: Creating key pair.");
+
+ openssl_x509_privkey_init(&key);
+ openssl_x509_privkey_generate(key, GNUTLS_PK_RSA, 2048, 0);
+
+ DEBUG_puts("1cupsMakeServerCredentials: Key pair created.");
+
+ /*
+ * Save it...
+ */
+
+ bytes = sizeof(buffer);
+
+ if ((result = openssl_x509_privkey_export(key, GNUTLS_X509_FMT_PEM, buffer, &bytes)) < 0)
+ {
+ DEBUG_printf(("1cupsMakeServerCredentials: Unable to export private key: %s", openssl_strerror(result)));
+ _cupsSetError(IPP_STATUS_ERROR_INTERNAL, openssl_strerror(result), 0);
+ openssl_x509_privkey_deinit(key);
+ return (0);
+ }
+ else if ((fp = cupsFileOpen(keyfile, "w")) != NULL)
+ {
+ DEBUG_printf(("1cupsMakeServerCredentials: Writing private key to \"%s\".", keyfile));
+ cupsFileWrite(fp, (char *)buffer, bytes);
+ cupsFileClose(fp);
+ }
+ else
+ {
+ DEBUG_printf(("1cupsMakeServerCredentials: Unable to create private key file \"%s\": %s", keyfile, strerror(errno)));
+ _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
+ openssl_x509_privkey_deinit(key);
+ return (0);
+ }
+
+ /*
+ * Create the self-signed certificate...
+ */
+
+ DEBUG_puts("1cupsMakeServerCredentials: Generating self-signed X.509 certificate.");
+
+ language = cupsLangDefault();
+ curtime = time(NULL);
+ serial[0] = curtime >> 24;
+ serial[1] = curtime >> 16;
+ serial[2] = curtime >> 8;
+ serial[3] = curtime;
+
+ openssl_x509_crt_init(&crt);
+ if (strlen(language->language) == 5)
+ openssl_x509_crt_set_dn_by_oid(crt, GNUTLS_OID_X520_COUNTRY_NAME, 0,
+ language->language + 3, 2);
+ else
+ openssl_x509_crt_set_dn_by_oid(crt, GNUTLS_OID_X520_COUNTRY_NAME, 0,
+ "US", 2);
+ openssl_x509_crt_set_dn_by_oid(crt, GNUTLS_OID_X520_COMMON_NAME, 0,
+ common_name, strlen(common_name));
+ openssl_x509_crt_set_dn_by_oid(crt, GNUTLS_OID_X520_ORGANIZATION_NAME, 0,
+ common_name, strlen(common_name));
+ openssl_x509_crt_set_dn_by_oid(crt, GNUTLS_OID_X520_ORGANIZATIONAL_UNIT_NAME,
+ 0, "Unknown", 7);
+ openssl_x509_crt_set_dn_by_oid(crt, GNUTLS_OID_X520_STATE_OR_PROVINCE_NAME, 0,
+ "Unknown", 7);
+ openssl_x509_crt_set_dn_by_oid(crt, GNUTLS_OID_X520_LOCALITY_NAME, 0,
+ "Unknown", 7);
+/* openssl_x509_crt_set_dn_by_oid(crt, GNUTLS_OID_PKCS9_EMAIL, 0,
+ ServerAdmin, strlen(ServerAdmin));*/
+ openssl_x509_crt_set_key(crt, key);
+ openssl_x509_crt_set_serial(crt, serial, sizeof(serial));
+ openssl_x509_crt_set_activation_time(crt, curtime);
+ openssl_x509_crt_set_expiration_time(crt, curtime + 10 * 365 * 86400);
+ openssl_x509_crt_set_ca_status(crt, 0);
+ openssl_x509_crt_set_subject_alt_name(crt, GNUTLS_SAN_DNSNAME, common_name, (unsigned)strlen(common_name), GNUTLS_FSAN_SET);
+ if (!strchr(common_name, '.'))
+ {
+ /*
+ * Add common_name.local to the list, too...
+ */
+
+ char localname[256]; /* hostname.local */
+
+ snprintf(localname, sizeof(localname), "%s.local", common_name);
+ openssl_x509_crt_set_subject_alt_name(crt, GNUTLS_SAN_DNSNAME, localname, (unsigned)strlen(localname), GNUTLS_FSAN_APPEND);
+ }
+ openssl_x509_crt_set_subject_alt_name(crt, GNUTLS_SAN_DNSNAME, "localhost", 9, GNUTLS_FSAN_APPEND);
+ if (num_alt_names > 0)
+ {
+ int i; /* Looping var */
+
+ for (i = 0; i < num_alt_names; i ++)
+ {
+ if (strcmp(alt_names[i], "localhost"))
+ {
+ openssl_x509_crt_set_subject_alt_name(crt, GNUTLS_SAN_DNSNAME, alt_names[i], (unsigned)strlen(alt_names[i]), GNUTLS_FSAN_APPEND);
+ }
+ }
+ }
+ openssl_x509_crt_set_key_purpose_oid(crt, GNUTLS_KP_TLS_WWW_SERVER, 0);
+ openssl_x509_crt_set_key_usage(crt, GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT);
+ openssl_x509_crt_set_version(crt, 3);
+
+ bytes = sizeof(buffer);
+ if (openssl_x509_crt_get_key_id(crt, 0, buffer, &bytes) >= 0)
+ openssl_x509_crt_set_subject_key_id(crt, buffer, bytes);
+
+ openssl_x509_crt_sign(crt, crt, key);
+
+ /*
+ * Save it...
+ */
+
+ bytes = sizeof(buffer);
+ if ((result = openssl_x509_crt_export(crt, GNUTLS_X509_FMT_PEM, buffer, &bytes)) < 0)
+ {
+ DEBUG_printf(("1cupsMakeServerCredentials: Unable to export public key and X.509 certificate: %s", openssl_strerror(result)));
+ _cupsSetError(IPP_STATUS_ERROR_INTERNAL, openssl_strerror(result), 0);
+ openssl_x509_crt_deinit(crt);
+ openssl_x509_privkey_deinit(key);
+ return (0);
+ }
+ else if ((fp = cupsFileOpen(crtfile, "w")) != NULL)
+ {
+ DEBUG_printf(("1cupsMakeServerCredentials: Writing public key and X.509 certificate to \"%s\".", crtfile));
+ cupsFileWrite(fp, (char *)buffer, bytes);
+ cupsFileClose(fp);
+ }
+ else
+ {
+ DEBUG_printf(("1cupsMakeServerCredentials: Unable to create public key and X.509 certificate file \"%s\": %s", crtfile, strerror(errno)));
+ _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
+ openssl_x509_crt_deinit(crt);
+ openssl_x509_privkey_deinit(key);
+ return (0);
+ }
+
+ /*
+ * Cleanup...
+ */
+
+ openssl_x509_crt_deinit(crt);
+ openssl_x509_privkey_deinit(key);
+
+ DEBUG_puts("1cupsMakeServerCredentials: Successfully created credentials.");
+
+ return (1);
+}
+
+
+/*
+ * 'cupsSetServerCredentials()' - Set the default server credentials.
+ *
+ * Note: The server credentials are used by all threads in the running process.
+ * This function is threadsafe.
+ *
+ * @since CUPS 2.0/OS 10.10@
+ */
+
+int /* O - 1 on success, 0 on failure */
+cupsSetServerCredentials(
+ const char *path, /* I - Path to keychain/directory */
+ const char *common_name, /* I - Default common name for server */
+ int auto_create) /* I - 1 = automatically create self-signed certificates */
+{
+ char temp[1024]; /* Default path buffer */
+
+
+ DEBUG_printf(("cupsSetServerCredentials(path=\"%s\", common_name=\"%s\", auto_create=%d)", path, common_name, auto_create));
+
+ /*
+ * Use defaults as needed...
+ */
+
+ if (!path)
+ path = http_openssl_default_path(temp, sizeof(temp));
+
+ /*
+ * Range check input...
+ */
+
+ if (!path || !common_name)
+ {
+ _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(EINVAL), 0);
+ return (0);
+ }
+
+ _cupsMutexLock(&tls_mutex);
+
+ /*
+ * Free old values...
+ */
+
+ if (tls_keypath)
+ _cupsStrFree(tls_keypath);
+
+ if (tls_common_name)
+ _cupsStrFree(tls_common_name);
+
+ /*
+ * Save the new values...
+ */
+
+ tls_keypath = _cupsStrAlloc(path);
+ tls_auto_create = auto_create;
+ tls_common_name = _cupsStrAlloc(common_name);
+
+ _cupsMutexUnlock(&tls_mutex);
+
+ return (1);
+}
+
+
+/*
+ * 'httpCopyCredentials()' - Copy the credentials associated with the peer in
+ * an encrypted connection.
+ *
+ * @since CUPS 1.5/macOS 10.7@
+ */
+
+int /* O - Status of call (0 = success) */
+httpCopyCredentials(
+ http_t *http, /* I - Connection to server */
+ cups_array_t **credentials) /* O - Array of credentials */
+{
+ unsigned count; /* Number of certificates */
+ const openssl_datum_t *certs; /* Certificates */
+
+
+ DEBUG_printf(("httpCopyCredentials(http=%p, credentials=%p)", http, credentials));
+
+ if (credentials)
+ *credentials = NULL;
+
+ if (!http || !http->tls || !credentials)
+ return (-1);
+
+ *credentials = cupsArrayNew(NULL, NULL);
+ certs = openssl_certificate_get_peers(http->tls, &count);
+
+ DEBUG_printf(("1httpCopyCredentials: certs=%p, count=%u", certs, count));
+
+ if (certs && count)
+ {
+ while (count > 0)
+ {
+ httpAddCredential(*credentials, certs->data, certs->size);
+ certs ++;
+ count --;
+ }
+ }
+
+ return (0);
+}
+
+
+/*
+ * '_httpCreateCredentials()' - Create credentials in the internal format.
+ */
+
+http_tls_credentials_t /* O - Internal credentials */
+_httpCreateCredentials(
+ cups_array_t *credentials) /* I - Array of credentials */
+{
+ (void)credentials;
+
+ return (NULL);
+}
+
+
+/*
+ * '_httpFreeCredentials()' - Free internal credentials.
+ */
+
+void
+_httpFreeCredentials(
+ http_tls_credentials_t credentials) /* I - Internal credentials */
+{
+ (void)credentials;
+}
+
+
+/*
+ * 'httpCredentialsAreValidForName()' - Return whether the credentials are valid for the given name.
+ *
+ * @since CUPS 2.0/OS 10.10@
+ */
+
+int /* O - 1 if valid, 0 otherwise */
+httpCredentialsAreValidForName(
+ cups_array_t *credentials, /* I - Credentials */
+ const char *common_name) /* I - Name to check */
+{
+ openssl_x509_crt_t cert; /* Certificate */
+ int result = 0; /* Result */
+
+
+ cert = http_openssl_create_credential((http_credential_t *)cupsArrayFirst(credentials));
+ if (cert)
+ {
+ result = openssl_x509_crt_check_hostname(cert, common_name) != 0;
+
+ if (result)
+ {
+ openssl_x509_crl_iter_t iter = NULL;
+ /* Iterator */
+ unsigned char cserial[1024], /* Certificate serial number */
+ rserial[1024]; /* Revoked serial number */
+ size_t cserial_size, /* Size of cert serial number */
+ rserial_size; /* Size of revoked serial number */
+
+ _cupsMutexLock(&tls_mutex);
+
+ if (openssl_x509_crl_get_crt_count(tls_crl) > 0)
+ {
+ cserial_size = sizeof(cserial);
+ openssl_x509_crt_get_serial(cert, cserial, &cserial_size);
+
+ rserial_size = sizeof(rserial);
+
+ while (!openssl_x509_crl_iter_crt_serial(tls_crl, &iter, rserial, &rserial_size, NULL))
+ {
+ if (cserial_size == rserial_size && !memcmp(cserial, rserial, rserial_size))
+ {
+ result = 0;
+ break;
+ }
+
+ rserial_size = sizeof(rserial);
+ }
+ openssl_x509_crl_iter_deinit(iter);
+ }
+
+ _cupsMutexUnlock(&tls_mutex);
+ }
+
+ openssl_x509_crt_deinit(cert);
+ }
+
+ return (result);
+}
+
+
+/*
+ * 'httpCredentialsGetTrust()' - Return the trust of credentials.
+ *
+ * @since CUPS 2.0/OS 10.10@
+ */
+
+http_trust_t /* O - Level of trust */
+httpCredentialsGetTrust(
+ cups_array_t *credentials, /* I - Credentials */
+ const char *common_name) /* I - Common name for trust lookup */
+{
+ http_trust_t trust = HTTP_TRUST_OK;
+ /* Trusted? */
+ openssl_x509_crt_t cert; /* Certificate */
+ cups_array_t *tcreds = NULL; /* Trusted credentials */
+ _cups_globals_t *cg = _cupsGlobals();
+ /* Per-thread globals */
+
+
+ if (!common_name)
+ {
+ _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("No common name specified."), 1);
+ return (HTTP_TRUST_UNKNOWN);
+ }
+
+ if ((cert = http_openssl_create_credential((http_credential_t *)cupsArrayFirst(credentials))) == NULL)
+ {
+ _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Unable to create credentials from array."), 1);
+ return (HTTP_TRUST_UNKNOWN);
+ }
+
+ if (cg->any_root < 0)
+ {
+ _cupsSetDefaults();
+ http_openssl_load_crl();
+ }
+
+ /*
+ * Look this common name up in the default keychains...
+ */
+
+ httpLoadCredentials(NULL, &tcreds, common_name);
+
+ if (tcreds)
+ {
+ char credentials_str[1024], /* String for incoming credentials */
+ tcreds_str[1024]; /* String for saved credentials */
+
+ httpCredentialsString(credentials, credentials_str, sizeof(credentials_str));
+ httpCredentialsString(tcreds, tcreds_str, sizeof(tcreds_str));
+
+ if (strcmp(credentials_str, tcreds_str))
+ {
+ /*
+ * Credentials don't match, let's look at the expiration date of the new
+ * credentials and allow if the new ones have a later expiration...
+ */
+
+ if (!cg->trust_first)
+ {
+ /*
+ * Do not trust certificates on first use...
+ */
+
+ _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Trust on first use is disabled."), 1);
+
+ trust = HTTP_TRUST_INVALID;
+ }
+ else if (httpCredentialsGetExpiration(credentials) <= httpCredentialsGetExpiration(tcreds))
+ {
+ /*
+ * The new credentials are not newly issued...
+ */
+
+ _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("New credentials are older than stored credentials."), 1);
+
+ trust = HTTP_TRUST_INVALID;
+ }
+ else if (!httpCredentialsAreValidForName(credentials, common_name))
+ {
+ /*
+ * The common name does not match the issued certificate...
+ */
+
+ _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("New credentials are not valid for name."), 1);
+
+ trust = HTTP_TRUST_INVALID;
+ }
+ else if (httpCredentialsGetExpiration(tcreds) < time(NULL))
+ {
+ /*
+ * Save the renewed credentials...
+ */
+
+ trust = HTTP_TRUST_RENEWED;
+
+ httpSaveCredentials(NULL, credentials, common_name);
+ }
+ }
+
+ httpFreeCredentials(tcreds);
+ }
+ else if (cg->validate_certs && !httpCredentialsAreValidForName(credentials, common_name))
+ {
+ _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("No stored credentials, not valid for name."), 1);
+ trust = HTTP_TRUST_INVALID;
+ }
+ else if (!cg->trust_first)
+ {
+ /*
+ * See if we have a site CA certificate we can compare...
+ */
+
+ if (!httpLoadCredentials(NULL, &tcreds, "site"))
+ {
+ if (cupsArrayCount(credentials) != (cupsArrayCount(tcreds) + 1))
+ {
+ /*
+ * Certificate isn't directly generated from the CA cert...
+ */
+
+ trust = HTTP_TRUST_INVALID;
+ }
+ else
+ {
+ /*
+ * Do a tail comparison of the two certificates...
+ */
+
+ http_credential_t *a, *b; /* Certificates */
+
+ for (a = (http_credential_t *)cupsArrayFirst(tcreds), b = (http_credential_t *)cupsArrayIndex(credentials, 1);
+ a && b;
+ a = (http_credential_t *)cupsArrayNext(tcreds), b = (http_credential_t *)cupsArrayNext(credentials))
+ if (a->datalen != b->datalen || memcmp(a->data, b->data, a->datalen))
+ break;
+
+ if (a || b)
+ trust = HTTP_TRUST_INVALID;
+ }
+
+ if (trust != HTTP_TRUST_OK)
+ _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Credentials do not validate against site CA certificate."), 1);
+ }
+ else
+ {
+ _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Trust on first use is disabled."), 1);
+ trust = HTTP_TRUST_INVALID;
+ }
+ }
+
+ if (trust == HTTP_TRUST_OK && !cg->expired_certs)
+ {
+ time_t curtime; /* Current date/time */
+
+ time(&curtime);
+ if (curtime < openssl_x509_crt_get_activation_time(cert) ||
+ curtime > openssl_x509_crt_get_expiration_time(cert))
+ {
+ _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Credentials have expired."), 1);
+ trust = HTTP_TRUST_EXPIRED;
+ }
+ }
+
+ if (trust == HTTP_TRUST_OK && !cg->any_root && cupsArrayCount(credentials) == 1)
+ {
+ _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Self-signed credentials are blocked."), 1);
+ trust = HTTP_TRUST_INVALID;
+ }
+
+ openssl_x509_crt_deinit(cert);
+
+ return (trust);
+}
+
+
+/*
+ * 'httpCredentialsGetExpiration()' - Return the expiration date of the credentials.
+ *
+ * @since CUPS 2.0/OS 10.10@
+ */
+
+time_t /* O - Expiration date of credentials */
+httpCredentialsGetExpiration(
+ cups_array_t *credentials) /* I - Credentials */
+{
+ openssl_x509_crt_t cert; /* Certificate */
+ time_t result = 0; /* Result */
+
+
+ cert = http_openssl_create_credential((http_credential_t *)cupsArrayFirst(credentials));
+ if (cert)
+ {
+ result = openssl_x509_crt_get_expiration_time(cert);
+ openssl_x509_crt_deinit(cert);
+ }
+
+ return (result);
+}
+
+
+/*
+ * 'httpCredentialsString()' - Return a string representing the credentials.
+ *
+ * @since CUPS 2.0/OS 10.10@
+ */
+
+size_t /* O - Total size of credentials string */
+httpCredentialsString(
+ cups_array_t *credentials, /* I - Credentials */
+ char *buffer, /* I - Buffer or @code NULL@ */
+ size_t bufsize) /* I - Size of buffer */
+{
+ http_credential_t *first; /* First certificate */
+ openssl_x509_crt_t cert; /* Certificate */
+
+
+ DEBUG_printf(("httpCredentialsString(credentials=%p, buffer=%p, bufsize=" CUPS_LLFMT ")", credentials, buffer, CUPS_LLCAST bufsize));
+
+ if (!buffer)
+ return (0);
+
+ if (bufsize > 0)
+ *buffer = '\0';
+
+ if ((first = (http_credential_t *)cupsArrayFirst(credentials)) != NULL &&
+ (cert = http_openssl_create_credential(first)) != NULL)
+ {
+ char name[256], /* Common name associated with cert */
+ issuer[256]; /* Issuer associated with cert */
+ size_t len; /* Length of string */
+ time_t expiration; /* Expiration date of cert */
+ int sigalg; /* Signature algorithm */
+ unsigned char md5_digest[16]; /* MD5 result */
+
+ len = sizeof(name) - 1;
+ if (openssl_x509_crt_get_dn_by_oid(cert, GNUTLS_OID_X520_COMMON_NAME, 0, 0, name, &len) >= 0)
+ name[len] = '\0';
+ else
+ strlcpy(name, "unknown", sizeof(name));
+
+ len = sizeof(issuer) - 1;
+ if (openssl_x509_crt_get_issuer_dn_by_oid(cert, GNUTLS_OID_X520_ORGANIZATION_NAME, 0, 0, issuer, &len) >= 0)
+ issuer[len] = '\0';
+ else
+ strlcpy(issuer, "unknown", sizeof(issuer));
+
+ expiration = openssl_x509_crt_get_expiration_time(cert);
+ sigalg = openssl_x509_crt_get_signature_algorithm(cert);
+
+ cupsHashData("md5", first->data, first->datalen, md5_digest, sizeof(md5_digest));
+
+ snprintf(buffer, bufsize, "%s (issued by %s) / %s / %s / %02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X", name, issuer, httpGetDateString(expiration), openssl_sign_get_name((openssl_sign_algorithm_t)sigalg), md5_digest[0], md5_digest[1], md5_digest[2], md5_digest[3], md5_digest[4], md5_digest[5], md5_digest[6], md5_digest[7], md5_digest[8], md5_digest[9], md5_digest[10], md5_digest[11], md5_digest[12], md5_digest[13], md5_digest[14], md5_digest[15]);
+
+ openssl_x509_crt_deinit(cert);
+ }
+
+ DEBUG_printf(("1httpCredentialsString: Returning \"%s\".", buffer));
+
+ return (strlen(buffer));
+}
+
+
+/*
+ * 'httpLoadCredentials()' - Load X.509 credentials from a keychain file.
+ *
+ * @since CUPS 2.0/OS 10.10@
+ */
+
+int /* O - 0 on success, -1 on error */
+httpLoadCredentials(
+ const char *path, /* I - Keychain/PKCS#12 path */
+ cups_array_t **credentials, /* IO - Credentials */
+ const char *common_name) /* I - Common name for credentials */
+{
+ cups_file_t *fp; /* Certificate file */
+ char filename[1024], /* filename.crt */
+ temp[1024], /* Temporary string */
+ line[256]; /* Base64-encoded line */
+ unsigned char *data = NULL; /* Buffer for cert data */
+ size_t alloc_data = 0, /* Bytes allocated */
+ num_data = 0; /* Bytes used */
+ int decoded; /* Bytes decoded */
+ int in_certificate = 0;
+ /* In a certificate? */
+
+
+ if (!credentials || !common_name)
+ return (-1);
+
+ if (!path)
+ path = http_openssl_default_path(temp, sizeof(temp));
+ if (!path)
+ return (-1);
+
+ http_openssl_make_path(filename, sizeof(filename), path, common_name, "crt");
+
+ if ((fp = cupsFileOpen(filename, "r")) == NULL)
+ return (-1);
+
+ while (cupsFileGets(fp, line, sizeof(line)))
+ {
+ if (!strcmp(line, "-----BEGIN CERTIFICATE-----"))
+ {
+ if (in_certificate)
+ {
+ /*
+ * Missing END CERTIFICATE...
+ */
+
+ httpFreeCredentials(*credentials);
+ *credentials = NULL;
+ break;
+ }
+
+ in_certificate = 1;
+ }
+ else if (!strcmp(line, "-----END CERTIFICATE-----"))
+ {
+ if (!in_certificate || !num_data)
+ {
+ /*
+ * Missing data...
+ */
+
+ httpFreeCredentials(*credentials);
+ *credentials = NULL;
+ break;
+ }
+
+ if (!*credentials)
+ *credentials = cupsArrayNew(NULL, NULL);
+
+ if (httpAddCredential(*credentials, data, num_data))
+ {
+ httpFreeCredentials(*credentials);
+ *credentials = NULL;
+ break;
+ }
+
+ num_data = 0;
+ in_certificate = 0;
+ }
+ else if (in_certificate)
+ {
+ if (alloc_data == 0)
+ {
+ data = malloc(2048);
+ alloc_data = 2048;
+
+ if (!data)
+ break;
+ }
+ else if ((num_data + strlen(line)) >= alloc_data)
+ {
+ unsigned char *tdata = realloc(data, alloc_data + 1024);
+ /* Expanded buffer */
+
+ if (!tdata)
+ {
+ httpFreeCredentials(*credentials);
+ *credentials = NULL;
+ break;
+ }
+
+ data = tdata;
+ alloc_data += 1024;
+ }
+
+ decoded = alloc_data - num_data;
+ httpDecode64_2((char *)data + num_data, &decoded, line);
+ num_data += (size_t)decoded;
+ }
+ }
+
+ cupsFileClose(fp);
+
+ if (in_certificate)
+ {
+ /*
+ * Missing END CERTIFICATE...
+ */
+
+ httpFreeCredentials(*credentials);
+ *credentials = NULL;
+ }
+
+ if (data)
+ free(data);
+
+ return (*credentials ? 0 : -1);
+}
+
+
+/*
+ * 'httpSaveCredentials()' - Save X.509 credentials to a keychain file.
+ *
+ * @since CUPS 2.0/OS 10.10@
+ */
+
+int /* O - -1 on error, 0 on success */
+httpSaveCredentials(
+ const char *path, /* I - Keychain/PKCS#12 path */
+ cups_array_t *credentials, /* I - Credentials */
+ const char *common_name) /* I - Common name for credentials */
+{
+ cups_file_t *fp; /* Certificate file */
+ char filename[1024], /* filename.crt */
+ nfilename[1024],/* filename.crt.N */
+ temp[1024], /* Temporary string */
+ line[256]; /* Base64-encoded line */
+ const unsigned char *ptr; /* Pointer into certificate */
+ ssize_t remaining; /* Bytes left */
+ http_credential_t *cred; /* Current credential */
+
+
+ if (!credentials || !common_name)
+ return (-1);
+
+ if (!path)
+ path = http_openssl_default_path(temp, sizeof(temp));
+ if (!path)
+ return (-1);
+
+ http_openssl_make_path(filename, sizeof(filename), path, common_name, "crt");
+ snprintf(nfilename, sizeof(nfilename), "%s.N", filename);
+
+ if ((fp = cupsFileOpen(nfilename, "w")) == NULL)
+ return (-1);
+
+ fchmod(cupsFileNumber(fp), 0600);
+
+ for (cred = (http_credential_t *)cupsArrayFirst(credentials);
+ cred;
+ cred = (http_credential_t *)cupsArrayNext(credentials))
+ {
+ cupsFilePuts(fp, "-----BEGIN CERTIFICATE-----\n");
+ for (ptr = cred->data, remaining = (ssize_t)cred->datalen; remaining > 0; remaining -= 45, ptr += 45)
+ {
+ httpEncode64_2(line, sizeof(line), (char *)ptr, remaining > 45 ? 45 : remaining);
+ cupsFilePrintf(fp, "%s\n", line);
+ }
+ cupsFilePuts(fp, "-----END CERTIFICATE-----\n");
+ }
+
+ cupsFileClose(fp);
+
+ return (rename(nfilename, filename));
+}
+
+
+/*
+ * 'http_openssl_create_credential()' - Create a single credential in the internal format.
+ */
+
+static openssl_x509_crt_t /* O - Certificate */
+http_openssl_create_credential(
+ http_credential_t *credential) /* I - Credential */
+{
+ int result; /* Result from GNU TLS */
+ openssl_x509_crt_t cert; /* Certificate */
+ openssl_datum_t datum; /* Data record */
+
+
+ DEBUG_printf(("3http_openssl_create_credential(credential=%p)", credential));
+
+ if (!credential)
+ return (NULL);
+
+ if ((result = openssl_x509_crt_init(&cert)) < 0)
+ {
+ DEBUG_printf(("4http_openssl_create_credential: init error: %s", openssl_strerror(result)));
+ return (NULL);
+ }
+
+ datum.data = credential->data;
+ datum.size = credential->datalen;
+
+ if ((result = openssl_x509_crt_import(cert, &datum, GNUTLS_X509_FMT_DER)) < 0)
+ {
+ DEBUG_printf(("4http_openssl_create_credential: import error: %s", openssl_strerror(result)));
+
+ openssl_x509_crt_deinit(cert);
+ return (NULL);
+ }
+
+ return (cert);
+}
+
+
+/*
+ * 'http_openssl_default_path()' - Get the default credential store path.
+ */
+
+static const char * /* O - Path or NULL on error */
+http_openssl_default_path(char *buffer,/* I - Path buffer */
+ size_t bufsize)/* I - Size of path buffer */
+{
+ _cups_globals_t *cg = _cupsGlobals();
+ /* Pointer to library globals */
+
+
+ if (cg->home && getuid())
+ {
+ snprintf(buffer, bufsize, "%s/.cups", cg->home);
+ if (access(buffer, 0))
+ {
+ DEBUG_printf(("1http_openssl_default_path: Making directory \"%s\".", buffer));
+ if (mkdir(buffer, 0700))
+ {
+ DEBUG_printf(("1http_openssl_default_path: Failed to make directory: %s", strerror(errno)));
+ return (NULL);
+ }
+ }
+
+ snprintf(buffer, bufsize, "%s/.cups/ssl", cg->home);
+ if (access(buffer, 0))
+ {
+ DEBUG_printf(("1http_openssl_default_path: Making directory \"%s\".", buffer));
+ if (mkdir(buffer, 0700))
+ {
+ DEBUG_printf(("1http_openssl_default_path: Failed to make directory: %s", strerror(errno)));
+ return (NULL);
+ }
+ }
+ }
+ else
+ strlcpy(buffer, CUPS_SERVERROOT "/ssl", bufsize);
+
+ DEBUG_printf(("1http_openssl_default_path: Using default path \"%s\".", buffer));
+
+ return (buffer);
+}
+
+
+/*
+ * 'http_openssl_load_crl()' - Load the certificate revocation list, if any.
+ */
+
+static void
+http_openssl_load_crl(void)
+{
+ _cupsMutexLock(&tls_mutex);
+
+ if (!openssl_x509_crl_init(&tls_crl))
+ {
+ cups_file_t *fp; /* CRL file */
+ char filename[1024], /* site.crl */
+ line[256]; /* Base64-encoded line */
+ unsigned char *data = NULL; /* Buffer for cert data */
+ size_t alloc_data = 0, /* Bytes allocated */
+ num_data = 0; /* Bytes used */
+ int decoded; /* Bytes decoded */
+ openssl_datum_t datum; /* Data record */
+
+
+ http_openssl_make_path(filename, sizeof(filename), CUPS_SERVERROOT, "site", "crl");
+
+ if ((fp = cupsFileOpen(filename, "r")) != NULL)
+ {
+ while (cupsFileGets(fp, line, sizeof(line)))
+ {
+ if (!strcmp(line, "-----BEGIN X509 CRL-----"))
+ {
+ if (num_data)
+ {
+ /*
+ * Missing END X509 CRL...
+ */
+
+ break;
+ }
+ }
+ else if (!strcmp(line, "-----END X509 CRL-----"))
+ {
+ if (!num_data)
+ {
+ /*
+ * Missing data...
+ */
+
+ break;
+ }
+
+ datum.data = data;
+ datum.size = num_data;
+
+ openssl_x509_crl_import(tls_crl, &datum, GNUTLS_X509_FMT_PEM);
+
+ num_data = 0;
+ }
+ else
+ {
+ if (alloc_data == 0)
+ {
+ data = malloc(2048);
+ alloc_data = 2048;
+
+ if (!data)
+ break;
+ }
+ else if ((num_data + strlen(line)) >= alloc_data)
+ {
+ unsigned char *tdata = realloc(data, alloc_data + 1024);
+ /* Expanded buffer */
+
+ if (!tdata)
+ break;
+
+ data = tdata;
+ alloc_data += 1024;
+ }
+
+ decoded = alloc_data - num_data;
+ httpDecode64_2((char *)data + num_data, &decoded, line);
+ num_data += (size_t)decoded;
+ }
+ }
+
+ cupsFileClose(fp);
+
+ if (data)
+ free(data);
+ }
+ }
+
+ _cupsMutexUnlock(&tls_mutex);
+}
+
+
+/*
+ * 'http_openssl_make_path()' - Format a filename for a certificate or key file.
+ */
+
+static const char * /* O - Filename */
+http_openssl_make_path(
+ char *buffer, /* I - Filename buffer */
+ size_t bufsize, /* I - Size of buffer */
+ const char *dirname, /* I - Directory */
+ const char *filename, /* I - Filename (usually hostname) */
+ const char *ext) /* I - Extension */
+{
+ char *bufptr, /* Pointer into buffer */
+ *bufend = buffer + bufsize - 1; /* End of buffer */
+
+
+ snprintf(buffer, bufsize, "%s/", dirname);
+ bufptr = buffer + strlen(buffer);
+
+ while (*filename && bufptr < bufend)
+ {
+ if (_cups_isalnum(*filename) || *filename == '-' || *filename == '.')
+ *bufptr++ = *filename;
+ else
+ *bufptr++ = '_';
+
+ filename ++;
+ }
+
+ if (bufptr < bufend)
+ *bufptr++ = '.';
+
+ strlcpy(bufptr, ext, (size_t)(bufend - bufptr + 1));
+
+ return (buffer);
+}
+
+
+/*
+ * 'http_openssl_read()' - Read function for the GNU TLS library.
+ */
+
+static ssize_t /* O - Number of bytes read or -1 on error */
+http_openssl_read(
+ openssl_transport_ptr_t ptr, /* I - Connection to server */
+ void *data, /* I - Buffer */
+ size_t length) /* I - Number of bytes to read */
+{
+ http_t *http; /* HTTP connection */
+ ssize_t bytes; /* Bytes read */
+
+
+ DEBUG_printf(("5http_openssl_read(ptr=%p, data=%p, length=%d)", ptr, data, (int)length));
+
+ http = (http_t *)ptr;
+
+ if (!http->blocking || http->timeout_value > 0.0)
+ {
+ /*
+ * Make sure we have data before we read...
+ */
+
+ while (!_httpWait(http, http->wait_value, 0))
+ {
+ if (http->timeout_cb && (*http->timeout_cb)(http, http->timeout_data))
+ continue;
+
+ http->error = ETIMEDOUT;
+ return (-1);
+ }
+ }
+
+ bytes = recv(http->fd, data, length, 0);
+ DEBUG_printf(("5http_openssl_read: bytes=%d", (int)bytes));
+ return (bytes);
+}
+
+
+/*
+ * 'http_openssl_write()' - Write function for the GNU TLS library.
+ */
+
+static ssize_t /* O - Number of bytes written or -1 on error */
+http_openssl_write(
+ openssl_transport_ptr_t ptr, /* I - Connection to server */
+ const void *data, /* I - Data buffer */
+ size_t length) /* I - Number of bytes to write */
+{
+ ssize_t bytes; /* Bytes written */
+
+
+ DEBUG_printf(("5http_openssl_write(ptr=%p, data=%p, length=%d)", ptr, data,
+ (int)length));
+ bytes = send(((http_t *)ptr)->fd, data, length, 0);
+ DEBUG_printf(("5http_openssl_write: bytes=%d", (int)bytes));
+
+ return (bytes);
+}
+
+
+/*
+ * '_httpTLSInitialize()' - Initialize the TLS stack.
+ */
+
+void
+_httpTLSInitialize(void)
+{
+ /*
+ * Initialize GNU TLS...
+ */
+
+ openssl_global_init();
+}
+
+
+/*
+ * '_httpTLSPending()' - Return the number of pending TLS-encrypted bytes.
+ */
+
+size_t /* O - Bytes available */
+_httpTLSPending(http_t *http) /* I - HTTP connection */
+{
+ return (openssl_record_check_pending(http->tls));
+}
+
+
+/*
+ * '_httpTLSRead()' - Read from a SSL/TLS connection.
+ */
+
+int /* O - Bytes read */
+_httpTLSRead(http_t *http, /* I - Connection to server */
+ char *buf, /* I - Buffer to store data */
+ int len) /* I - Length of buffer */
+{
+ ssize_t result; /* Return value */
+
+
+ result = openssl_record_recv(http->tls, buf, (size_t)len);
+
+ if (result < 0 && !errno)
+ {
+ /*
+ * Convert GNU TLS error to errno value...
+ */
+
+ switch (result)
+ {
+ case GNUTLS_E_INTERRUPTED :
+ errno = EINTR;
+ break;
+
+ case GNUTLS_E_AGAIN :
+ errno = EAGAIN;
+ break;
+
+ default :
+ errno = EPIPE;
+ break;
+ }
+
+ result = -1;
+ }
+
+ return ((int)result);
+}
+
+
+/*
+ * '_httpTLSSetOptions()' - Set TLS protocol and cipher suite options.
+ */
+
+void
+_httpTLSSetOptions(int options, /* I - Options */
+ int min_version, /* I - Minimum TLS version */
+ int max_version) /* I - Maximum TLS version */
+{
+ if (!(options & _HTTP_TLS_SET_DEFAULT) || tls_options < 0)
+ {
+ tls_options = options;
+ tls_min_version = min_version;
+ tls_max_version = max_version;
+ }
+}
+
+
+/*
+ * '_httpTLSStart()' - Set up SSL/TLS support on a connection.
+ */
+
+int /* O - 0 on success, -1 on failure */
+_httpTLSStart(http_t *http) /* I - Connection to server */
+{
+ char hostname[256], /* Hostname */
+ *hostptr; /* Pointer into hostname */
+ int status; /* Status of handshake */
+ openssl_certificate_credentials_t *credentials;
+ /* TLS credentials */
+ char priority_string[2048];
+ /* Priority string */
+ int version; /* Current version */
+ double old_timeout; /* Old timeout value */
+ http_timeout_cb_t old_cb; /* Old timeout callback */
+ void *old_data; /* Old timeout data */
+ static const char * const versions[] =/* SSL/TLS versions */
+ {
+ "VERS-SSL3.0",
+ "VERS-TLS1.0",
+ "VERS-TLS1.1",
+ "VERS-TLS1.2",
+ "VERS-TLS1.3",
+ "VERS-TLS-ALL"
+ };
+
+
+ DEBUG_printf(("3_httpTLSStart(http=%p)", http));
+
+ if (tls_options < 0)
+ {
+ DEBUG_puts("4_httpTLSStart: Setting defaults.");
+ _cupsSetDefaults();
+ DEBUG_printf(("4_httpTLSStart: tls_options=%x", tls_options));
+ }
+
+ if (http->mode == _HTTP_MODE_SERVER && !tls_keypath)
+ {
+ DEBUG_puts("4_httpTLSStart: cupsSetServerCredentials not called.");
+ http->error = errno = EINVAL;
+ http->status = HTTP_STATUS_ERROR;
+ _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Server credentials not set."), 1);
+
+ return (-1);
+ }
+
+ credentials = (openssl_certificate_credentials_t *)
+ malloc(sizeof(openssl_certificate_credentials_t));
+ if (credentials == NULL)
+ {
+ DEBUG_printf(("8_httpStartTLS: Unable to allocate credentials: %s",
+ strerror(errno)));
+ http->error = errno;
+ http->status = HTTP_STATUS_ERROR;
+ _cupsSetHTTPError(HTTP_STATUS_ERROR);
+
+ return (-1);
+ }
+
+ openssl_certificate_allocate_credentials(credentials);
+ status = openssl_init(&http->tls, http->mode == _HTTP_MODE_CLIENT ? GNUTLS_CLIENT : GNUTLS_SERVER);
+ if (!status)
+ status = openssl_set_default_priority(http->tls);
+
+ if (status)
+ {
+ http->error = EIO;
+ http->status = HTTP_STATUS_ERROR;
+
+ DEBUG_printf(("4_httpTLSStart: Unable to initialize common TLS parameters: %s", openssl_strerror(status)));
+ _cupsSetError(IPP_STATUS_ERROR_CUPS_PKI, openssl_strerror(status), 0);
+
+ openssl_deinit(http->tls);
+ openssl_certificate_free_credentials(*credentials);
+ free(credentials);
+ http->tls = NULL;
+
+ return (-1);
+ }
+
+ if (http->mode == _HTTP_MODE_CLIENT)
+ {
+ /*
+ * Client: get the hostname to use for TLS...
+ */
+
+ if (httpAddrLocalhost(http->hostaddr))
+ {
+ strlcpy(hostname, "localhost", sizeof(hostname));
+ }
+ else
+ {
+ /*
+ * Otherwise make sure the hostname we have does not end in a trailing dot.
+ */
+
+ strlcpy(hostname, http->hostname, sizeof(hostname));
+ if ((hostptr = hostname + strlen(hostname) - 1) >= hostname &&
+ *hostptr == '.')
+ *hostptr = '\0';
+ }
+
+ status = openssl_server_name_set(http->tls, GNUTLS_NAME_DNS, hostname, strlen(hostname));
+ }
+ else
+ {
+ /*
+ * Server: get certificate and private key...
+ */
+
+ char crtfile[1024], /* Certificate file */
+ keyfile[1024]; /* Private key file */
+ int have_creds = 0; /* Have credentials? */
+
+ if (http->fields[HTTP_FIELD_HOST])
+ {
+ /*
+ * Use hostname for TLS upgrade...
+ */
+
+ strlcpy(hostname, http->fields[HTTP_FIELD_HOST], sizeof(hostname));
+ }
+ else
+ {
+ /*
+ * Resolve hostname from connection address...
+ */
+
+ http_addr_t addr; /* Connection address */
+ socklen_t addrlen; /* Length of address */
+
+ addrlen = sizeof(addr);
+ if (getsockname(http->fd, (struct sockaddr *)&addr, &addrlen))
+ {
+ DEBUG_printf(("4_httpTLSStart: Unable to get socket address: %s", strerror(errno)));
+ hostname[0] = '\0';
+ }
+ else if (httpAddrLocalhost(&addr))
+ hostname[0] = '\0';
+ else
+ {
+ httpAddrLookup(&addr, hostname, sizeof(hostname));
+ DEBUG_printf(("4_httpTLSStart: Resolved socket address to \"%s\".", hostname));
+ }
+ }
+
+ if (isdigit(hostname[0] & 255) || hostname[0] == '[')
+ hostname[0] = '\0'; /* Don't allow numeric addresses */
+
+ if (hostname[0])
+ {
+ /*
+ * First look in the CUPS keystore...
+ */
+
+ http_openssl_make_path(crtfile, sizeof(crtfile), tls_keypath, hostname, "crt");
+ http_openssl_make_path(keyfile, sizeof(keyfile), tls_keypath, hostname, "key");
+
+ if (access(crtfile, R_OK) || access(keyfile, R_OK))
+ {
+ /*
+ * No CUPS-managed certs, look for CA certs...
+ */
+
+ char cacrtfile[1024], cakeyfile[1024]; /* CA cert files */
+
+ snprintf(cacrtfile, sizeof(cacrtfile), "/etc/letsencrypt/live/%s/fullchain.pem", hostname);
+ snprintf(cakeyfile, sizeof(cakeyfile), "/etc/letsencrypt/live/%s/privkey.pem", hostname);
+
+ if ((access(cacrtfile, R_OK) || access(cakeyfile, R_OK)) && (hostptr = strchr(hostname, '.')) != NULL)
+ {
+ /*
+ * Try just domain name...
+ */
+
+ hostptr ++;
+ if (strchr(hostptr, '.'))
+ {
+ snprintf(cacrtfile, sizeof(cacrtfile), "/etc/letsencrypt/live/%s/fullchain.pem", hostptr);
+ snprintf(cakeyfile, sizeof(cakeyfile), "/etc/letsencrypt/live/%s/privkey.pem", hostptr);
+ }
+ }
+
+ if (!access(cacrtfile, R_OK) && !access(cakeyfile, R_OK))
+ {
+ /*
+ * Use the CA certs...
+ */
+
+ strlcpy(crtfile, cacrtfile, sizeof(crtfile));
+ strlcpy(keyfile, cakeyfile, sizeof(keyfile));
+ }
+ }
+
+ have_creds = !access(crtfile, R_OK) && !access(keyfile, R_OK);
+ }
+ else if (tls_common_name)
+ {
+ /*
+ * First look in the CUPS keystore...
+ */
+
+ http_openssl_make_path(crtfile, sizeof(crtfile), tls_keypath, tls_common_name, "crt");
+ http_openssl_make_path(keyfile, sizeof(keyfile), tls_keypath, tls_common_name, "key");
+
+ if (access(crtfile, R_OK) || access(keyfile, R_OK))
+ {
+ /*
+ * No CUPS-managed certs, look for CA certs...
+ */
+
+ char cacrtfile[1024], cakeyfile[1024]; /* CA cert files */
+
+ snprintf(cacrtfile, sizeof(cacrtfile), "/etc/letsencrypt/live/%s/fullchain.pem", tls_common_name);
+ snprintf(cakeyfile, sizeof(cakeyfile), "/etc/letsencrypt/live/%s/privkey.pem", tls_common_name);
+
+ if ((access(cacrtfile, R_OK) || access(cakeyfile, R_OK)) && (hostptr = strchr(tls_common_name, '.')) != NULL)
+ {
+ /*
+ * Try just domain name...
+ */
+
+ hostptr ++;
+ if (strchr(hostptr, '.'))
+ {
+ snprintf(cacrtfile, sizeof(cacrtfile), "/etc/letsencrypt/live/%s/fullchain.pem", hostptr);
+ snprintf(cakeyfile, sizeof(cakeyfile), "/etc/letsencrypt/live/%s/privkey.pem", hostptr);
+ }
+ }
+
+ if (!access(cacrtfile, R_OK) && !access(cakeyfile, R_OK))
+ {
+ /*
+ * Use the CA certs...
+ */
+
+ strlcpy(crtfile, cacrtfile, sizeof(crtfile));
+ strlcpy(keyfile, cakeyfile, sizeof(keyfile));
+ }
+ }
+
+ have_creds = !access(crtfile, R_OK) && !access(keyfile, R_OK);
+ }
+
+ if (!have_creds && tls_auto_create && (hostname[0] || tls_common_name))
+ {
+ DEBUG_printf(("4_httpTLSStart: Auto-create credentials for \"%s\".", hostname[0] ? hostname : tls_common_name));
+
+ if (!cupsMakeServerCredentials(tls_keypath, hostname[0] ? hostname : tls_common_name, 0, NULL, time(NULL) + 365 * 86400))
+ {
+ DEBUG_puts("4_httpTLSStart: cupsMakeServerCredentials failed.");
+ http->error = errno = EINVAL;
+ http->status = HTTP_STATUS_ERROR;
+ _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Unable to create server credentials."), 1);
+
+ return (-1);
+ }
+ }
+
+ DEBUG_printf(("4_httpTLSStart: Using certificate \"%s\" and private key \"%s\".", crtfile, keyfile));
+
+ status = openssl_certificate_set_x509_key_file(*credentials, crtfile, keyfile, GNUTLS_X509_FMT_PEM);
+ }
+
+ if (!status)
+ status = openssl_credentials_set(http->tls, GNUTLS_CRD_CERTIFICATE, *credentials);
+
+ if (status)
+ {
+ http->error = EIO;
+ http->status = HTTP_STATUS_ERROR;
+
+ DEBUG_printf(("4_httpTLSStart: Unable to complete client/server setup: %s", openssl_strerror(status)));
+ _cupsSetError(IPP_STATUS_ERROR_CUPS_PKI, openssl_strerror(status), 0);
+
+ openssl_deinit(http->tls);
+ openssl_certificate_free_credentials(*credentials);
+ free(credentials);
+ http->tls = NULL;
+
+ return (-1);
+ }
+
+ strlcpy(priority_string, "NORMAL", sizeof(priority_string));
+
+ if (tls_max_version < _HTTP_TLS_MAX)
+ {
+ /*
+ * Require specific TLS versions...
+ */
+
+ strlcat(priority_string, ":-VERS-TLS-ALL", sizeof(priority_string));
+ for (version = tls_min_version; version <= tls_max_version; version ++)
+ {
+ strlcat(priority_string, ":+", sizeof(priority_string));
+ strlcat(priority_string, versions[version], sizeof(priority_string));
+ }
+ }
+ else if (tls_min_version == _HTTP_TLS_SSL3)
+ {
+ /*
+ * Allow all versions of TLS and SSL/3.0...
+ */
+
+ strlcat(priority_string, ":+VERS-TLS-ALL:+VERS-SSL3.0", sizeof(priority_string));
+ }
+ else
+ {
+ /*
+ * Require a minimum version...
+ */
+
+ strlcat(priority_string, ":+VERS-TLS-ALL", sizeof(priority_string));
+ for (version = 0; version < tls_min_version; version ++)
+ {
+ strlcat(priority_string, ":-", sizeof(priority_string));
+ strlcat(priority_string, versions[version], sizeof(priority_string));
+ }
+ }
+
+ if (tls_options & _HTTP_TLS_ALLOW_RC4)
+ strlcat(priority_string, ":+ARCFOUR-128", sizeof(priority_string));
+ else
+ strlcat(priority_string, ":!ARCFOUR-128", sizeof(priority_string));
+
+ strlcat(priority_string, ":!ANON-DH", sizeof(priority_string));
+
+ if (tls_options & _HTTP_TLS_DENY_CBC)
+ strlcat(priority_string, ":!AES-128-CBC:!AES-256-CBC:!CAMELLIA-128-CBC:!CAMELLIA-256-CBC:!3DES-CBC", sizeof(priority_string));
+
+#ifdef HAVE_GNUTLS_PRIORITY_SET_DIRECT
+ openssl_priority_set_direct(http->tls, priority_string, NULL);
+
+#else
+ openssl_priority_t priority; /* Priority */
+
+ openssl_priority_init(&priority, priority_string, NULL);
+ openssl_priority_set(http->tls, priority);
+ openssl_priority_deinit(priority);
+#endif /* HAVE_GNUTLS_PRIORITY_SET_DIRECT */
+
+ openssl_transport_set_ptr(http->tls, (openssl_transport_ptr_t)http);
+ openssl_transport_set_pull_function(http->tls, http_openssl_read);
+#ifdef HAVE_GNUTLS_TRANSPORT_SET_PULL_TIMEOUT_FUNCTION
+ openssl_transport_set_pull_timeout_function(http->tls, (openssl_pull_timeout_func)httpWait);
+#endif /* HAVE_GNUTLS_TRANSPORT_SET_PULL_TIMEOUT_FUNCTION */
+ openssl_transport_set_push_function(http->tls, http_openssl_write);
+
+ /*
+ * Enforce a minimum timeout of 10 seconds for the TLS handshake...
+ */
+
+ old_timeout = http->timeout_value;
+ old_cb = http->timeout_cb;
+ old_data = http->timeout_data;
+
+ if (!old_cb || old_timeout < 10.0)
+ {
+ DEBUG_puts("4_httpTLSStart: Setting timeout to 10 seconds.");
+ httpSetTimeout(http, 10.0, NULL, NULL);
+ }
+
+ /*
+ * Do the TLS handshake...
+ */
+
+ while ((status = openssl_handshake(http->tls)) != GNUTLS_E_SUCCESS)
+ {
+ DEBUG_printf(("5_httpStartTLS: openssl_handshake returned %d (%s)",
+ status, openssl_strerror(status)));
+
+ if (openssl_error_is_fatal(status))
+ {
+ http->error = EIO;
+ http->status = HTTP_STATUS_ERROR;
+
+ _cupsSetError(IPP_STATUS_ERROR_CUPS_PKI, openssl_strerror(status), 0);
+
+ openssl_deinit(http->tls);
+ openssl_certificate_free_credentials(*credentials);
+ free(credentials);
+ http->tls = NULL;
+
+ httpSetTimeout(http, old_timeout, old_cb, old_data);
+
+ return (-1);
+ }
+ }
+
+ /*
+ * Restore the previous timeout settings...
+ */
+
+ httpSetTimeout(http, old_timeout, old_cb, old_data);
+
+ http->tls_credentials = credentials;
+
+ return (0);
+}
+
+
+/*
+ * '_httpTLSStop()' - Shut down SSL/TLS on a connection.
+ */
+
+void
+_httpTLSStop(http_t *http) /* I - Connection to server */
+{
+ int error; /* Error code */
+
+
+ error = openssl_bye(http->tls, http->mode == _HTTP_MODE_CLIENT ? GNUTLS_SHUT_RDWR : GNUTLS_SHUT_WR);
+ if (error != GNUTLS_E_SUCCESS)
+ _cupsSetError(IPP_STATUS_ERROR_INTERNAL, openssl_strerror(errno), 0);
+
+ openssl_deinit(http->tls);
+ http->tls = NULL;
+
+ if (http->tls_credentials)
+ {
+ openssl_certificate_free_credentials(*(http->tls_credentials));
+ free(http->tls_credentials);
+ http->tls_credentials = NULL;
+ }
+}
+
+
+/*
+ * '_httpTLSWrite()' - Write to a SSL/TLS connection.
+ */
+
+int /* O - Bytes written */
+_httpTLSWrite(http_t *http, /* I - Connection to server */
+ const char *buf, /* I - Buffer holding data */
+ int len) /* I - Length of buffer */
+{
+ ssize_t result; /* Return value */
+
+
+ DEBUG_printf(("5_httpTLSWrite(http=%p, buf=%p, len=%d)", http, buf, len));
+
+ result = openssl_record_send(http->tls, buf, (size_t)len);
+
+ if (result < 0 && !errno)
+ {
+ /*
+ * Convert GNU TLS error to errno value...
+ */
+
+ switch (result)
+ {
+ case GNUTLS_E_INTERRUPTED :
+ errno = EINTR;
+ break;
+
+ case GNUTLS_E_AGAIN :
+ errno = EAGAIN;
+ break;
+
+ default :
+ errno = EPIPE;
+ break;
+ }
+
+ result = -1;
+ }
+
+ DEBUG_printf(("5_httpTLSWrite: Returning %d.", (int)result));
+
+ return ((int)result);
+}
projects / thirdparty / cups.git / commitdiff
