/*
- * "$Id: auth.c 6191 2007-01-10 16:48:37Z mike $"
+ * "$Id: auth.c 6253 2007-02-10 18:48:40Z mike $"
*
* Authentication functions for the Common UNIX Printing System (CUPS).
*
* Copyright 1997-2007 by Easy Software Products.
*
+ * This file contains Kerberos support code, copyright 2006 by
+ * Jelmer Vernooij.
+ *
* These coded instructions, statements, and computer programs are the
* property of Easy Software Products and are protected by Federal
* copyright law. Distribution and use rights are outlined in the file
* Contents:
*
* cupsDoAuthentication() - Authenticate a request.
+ * DEBUG_gss_printf() - Show debug error messages from GSSAPI...
+ * cups_get_gss_creds() - Get CUPS service credentials for authentication.
* cups_local_auth() - Get the local authorization certificate if
* available/applicable...
*/
# include <unistd.h>
#endif /* WIN32 || __EMX__ */
+#if HAVE_AUTHORIZATION_H
+# include <Security/Authorization.h>
+# ifdef HAVE_SECBASEPRIV_H
+# include <Security/SecBasePriv.h>
+# else
+extern const char *cssmErrorString(int error);
+# endif /* HAVE_SECBASEPRIV_H */
+#endif /* HAVE_AUTHORIZATION_H */
+
/*
* Local functions...
*/
+#ifdef HAVE_GSSAPI
+# ifdef DEBUG
+static void DEBUG_gss_printf(OM_uint32 major_status, OM_uint32 minor_status,
+ const char *message);
+# endif /* DEBUG */
+static gss_name_t cups_get_gss_creds(http_t *http, const char *service_name);
+#endif /* HAVE_GSSAPI */
static int cups_local_auth(http_t *http);
char prompt[1024], /* Prompt for user */
realm[HTTP_MAX_VALUE], /* realm="xyz" string */
nonce[HTTP_MAX_VALUE], /* nonce="xyz" string */
- encode[512]; /* Encoded username:password */
+ encode[2048]; /* Encoded username:password */
+ int localauth; /* Local authentication result */
_cups_globals_t *cg; /* Global data */
* Clear the current authentication string...
*/
- http->authstring[0] = '\0';
+ http->_authstring[0] = '\0';
+
+ if (http->authstring && http->authstring != http->_authstring)
+ free(http->authstring);
+
+ http->authstring = http->_authstring;
/*
* See if we can do local authentication...
*/
- if (http->digest_tries < 3 && !cups_local_auth(http))
+ if (http->digest_tries < 3)
{
- DEBUG_printf(("cupsDoAuthentication: authstring=\"%s\"\n", http->authstring));
-
- if (http->status == HTTP_UNAUTHORIZED)
- http->digest_tries ++;
-
- return (0);
+ if ((localauth = cups_local_auth(http)) == 0)
+ {
+ DEBUG_printf(("cupsDoAuthentication: authstring=\"%s\"\n",
+ http->authstring));
+
+ if (http->status == HTTP_UNAUTHORIZED)
+ http->digest_tries ++;
+
+ return (0);
+ }
+ else if (localauth == -1)
+ return (-1); /* Error or canceled */
}
/*
* Nope, see if we should retry the current username:password...
*/
- if (http->digest_tries > 1 || !http->userpass[0])
+ if ((http->digest_tries > 1 || !http->userpass[0]) &&
+ strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9))
{
/*
* Nope - get a new password from the user...
* Got a password; encode it for the server...
*/
- if (strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Digest", 6))
+ if (!strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9))
+ {
+#ifdef HAVE_GSSAPI
+ /*
+ * Kerberos authentication...
+ */
+
+ OM_uint32 minor_status, /* Minor status code */
+ major_status; /* Major status code */
+ gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER,
+ /* Output token */
+ input_token = GSS_C_EMPTY_BUFFER;
+ /* Input token */
+ char *gss_service_name;
+ /* GSS service name */
+ const char *authorization;
+ /* Pointer into Authorization string */
+
+
+ if (http->gssname == GSS_C_NO_NAME)
+ {
+ if ((gss_service_name = getenv("CUPS_GSSSERVICENAME")) == NULL)
+ gss_service_name = CUPS_DEFAULT_GSSSERVICENAME;
+ else
+ DEBUG_puts("cupsDoAuthentication: GSS service name set via environment");
+
+ http->gssname = cups_get_gss_creds(http, gss_service_name);
+ }
+
+ /*
+ * Find the start of the Kerberos input token...
+ */
+
+ authorization = httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE);
+
+ authorization += 9;
+ while (*authorization && isspace(*authorization & 255))
+ authorization ++;
+
+ if (*authorization)
+ {
+ /*
+ * For SPNEGO, this is where we'll feed the server's authorization data
+ * back into gss via input_token...
+ */
+ }
+ else
+ {
+ if (http->gssctx != GSS_C_NO_CONTEXT)
+ {
+ major_status = gss_delete_sec_context(&minor_status, &http->gssctx,
+ GSS_C_NO_BUFFER);
+ http->gssctx = GSS_C_NO_CONTEXT;
+ }
+ }
+
+ major_status = gss_init_sec_context(&minor_status, GSS_C_NO_CREDENTIAL,
+ &http->gssctx,
+ http->gssname, http->gssmech,
+ GSS_C_MUTUAL_FLAG, GSS_C_INDEFINITE,
+ GSS_C_NO_CHANNEL_BINDINGS,
+ &input_token, &http->gssmech,
+ &output_token, NULL, NULL);
+
+ if (input_token.value)
+ free(input_token.value);
+
+ if (GSS_ERROR(major_status))
+ {
+# ifdef DEBUG
+ DEBUG_gss_printf(major_status, minor_status,
+ "Unable to initialise security context");
+# endif /* DEBUG */
+ return (-1);
+ }
+
+# ifdef DEBUG
+ if (major_status == GSS_S_CONTINUE_NEEDED)
+ DEBUG_gss_printf(major_status, minor_status, "Continuation needed!");
+# endif /* DEBUG */
+
+ if (output_token.length)
+ {
+ httpEncode64_2(encode, sizeof(encode), output_token.value,
+ output_token.length);
+
+ http->authstring = malloc(strlen(encode) + 11);
+ sprintf(http->authstring, "Negotiate %s", encode); /* Safe because allocated */
+
+ major_status = gss_release_buffer(&minor_status, &output_token);
+ }
+
+ /*
+ * Copy back what we can to _authstring for backwards compatibility...
+ */
+
+ strlcpy(http->_authstring, http->authstring, sizeof(http->_authstring));
+#endif /* HAVE_GSSAPI */
+ }
+ else if (strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Digest", 6))
{
/*
* Basic authentication...
httpEncode64_2(encode, sizeof(encode), http->userpass,
(int)strlen(http->userpass));
- snprintf(http->authstring, sizeof(http->authstring), "Basic %s", encode);
+ snprintf(http->_authstring, sizeof(http->_authstring), "Basic %s", encode);
}
else
{
httpMD5(cupsUser(), realm, strchr(http->userpass, ':') + 1, encode);
httpMD5Final(nonce, method, resource, encode);
- snprintf(http->authstring, sizeof(http->authstring),
+ snprintf(http->_authstring, sizeof(http->_authstring),
"Digest username=\"%s\", realm=\"%s\", nonce=\"%s\", "
"uri=\"%s\", response=\"%s\"", cupsUser(), realm, nonce,
resource, encode);
}
+#ifdef HAVE_GSSAPI
+# ifdef DEBUG
+/*
+ * 'DEBUG_gss_printf()' - Show debug error messages from GSSAPI...
+ */
+
+static void
+DEBUG_gss_printf(OM_uint32 major_status,/* I - Major status code */
+ OM_uint32 minor_status,/* I - Minor status code */
+ const char *message) /* I - Prefix for error message */
+{
+ OM_uint32 err_major_status, /* Major status code for display */
+ err_minor_status; /* Minor status code for display */
+ OM_uint32 msg_ctx; /* Message context */
+ gss_buffer_desc major_status_string = GSS_C_EMPTY_BUFFER,
+ /* Major status message */
+ minor_status_string = GSS_C_EMPTY_BUFFER;
+ /* Minor status message */
+
+
+ msg_ctx = 0;
+ err_major_status = gss_display_status(&err_minor_status,
+ major_status,
+ GSS_C_GSS_CODE,
+ GSS_C_NO_OID,
+ &msg_ctx,
+ &major_status_string);
+
+ if (!GSS_ERROR(err_major_status))
+ err_major_status = gss_display_status(&err_minor_status,
+ minor_status,
+ GSS_C_MECH_CODE,
+ GSS_C_NULL_OID,
+ &msg_ctx,
+ &minor_status_string);
+
+ printf("%s: %s, %s\n", message, (char *)major_status_string.value,
+ (char *)minor_status_string.value);
+
+ gss_release_buffer(&err_minor_status, &major_status_string);
+ gss_release_buffer(&err_minor_status, &minor_status_string);
+}
+# endif /* DEBUG */
+
+
+/*
+ * 'cups_get_gss_creds()' - Get CUPS service credentials for authentication.
+ */
+
+static gss_name_t /* O - Server name */
+cups_get_gss_creds(
+ http_t *http, /* I - Connection to server */
+ const char *service_name) /* I - Service name */
+{
+ gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
+ /* Service token */
+ OM_uint32 major_status, /* Major status code */
+ minor_status; /* Minor status code */
+ gss_name_t server_name; /* Server name */
+ char buf[1024], /* Name buffer */
+ fqdn[HTTP_MAX_URI]; /* Server name buffer */
+
+
+ /*
+ * Get a server name we can use for authentication purposes...
+ */
+
+ snprintf(buf, sizeof(buf), "%s@%s", service_name,
+ httpGetHostname(http, fqdn, sizeof(fqdn)));
+
+ token.value = buf;
+ token.length = strlen(buf);
+ server_name = GSS_C_NO_NAME;
+ major_status = gss_import_name(&minor_status, &token,
+ GSS_C_NT_HOSTBASED_SERVICE,
+ &server_name);
+
+ if (GSS_ERROR(major_status))
+ {
+# ifdef DEBUG
+ DEBUG_gss_printf(major_status, minor_status, "gss_import_name() failed");
+# endif /* DEBUG */
+
+ return (NULL);
+ }
+
+ return (server_name);
+}
+#endif /* HAVE_GSSAPI */
+
+
/*
* 'cups_local_auth()' - Get the local authorization certificate if
* available/applicable...
*/
-static int /* O - 0 if available, -1 if not */
+static int /* O - 0 if available */
+ /* 1 if not available */
+ /* -1 error */
cups_local_auth(http_t *http) /* I - HTTP connection to server */
{
#if defined(WIN32) || defined(__EMX__)
return (-1);
#else
- int pid; /* Current process ID */
- FILE *fp; /* Certificate file */
- char filename[1024], /* Certificate filename */
- certificate[33]; /* Certificate string */
+ int pid; /* Current process ID */
+ FILE *fp; /* Certificate file */
+ char filename[1024], /* Certificate filename */
+ certificate[33];/* Certificate string */
_cups_globals_t *cg = _cupsGlobals(); /* Global data */
+#if defined(HAVE_AUTHORIZATION_H)
+ OSStatus status; /* Status */
+ AuthorizationItem auth_right; /* Authorization right */
+ AuthorizationRights auth_rights; /* Authorization rights */
+ AuthorizationFlags auth_flags; /* Authorization flags */
+ AuthorizationExternalForm auth_extrn; /* Authorization ref external */
+ char auth_key[1024]; /* Buffer */
+ char buffer[1024]; /* Buffer */
+#endif /* HAVE_AUTHORIZATION_H */
DEBUG_printf(("cups_local_auth(http=%p) hostaddr=%s, hostname=\"%s\"\n",
return (-1);
}
+#if defined(HAVE_AUTHORIZATION_H)
+ /*
+ * Delete any previous authorization reference...
+ */
+
+ if (cg->auth_ref)
+ {
+ AuthorizationFree(cg->auth_ref, kAuthorizationFlagDefaults);
+ cg->auth_ref = NULL;
+ }
+
+ if (httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
+ auth_key, sizeof(auth_key)))
+ {
+ status = AuthorizationCreate(NULL, kAuthorizationEmptyEnvironment,
+ kAuthorizationFlagDefaults, &cg->auth_ref);
+ if (status != errAuthorizationSuccess)
+ {
+ DEBUG_printf(("cups_local_auth: AuthorizationCreate() returned %d (%s)\n",
+ (int)status, cssmErrorString(status)));
+ return (-1);
+ }
+
+ auth_right.name = auth_key;
+ auth_right.valueLength = 0;
+ auth_right.value = NULL;
+ auth_right.flags = 0;
+
+ auth_rights.count = 1;
+ auth_rights.items = &auth_right;
+
+ auth_flags = kAuthorizationFlagDefaults |
+ kAuthorizationFlagPreAuthorize |
+ kAuthorizationFlagInteractionAllowed |
+ kAuthorizationFlagExtendRights;
+
+ status = AuthorizationCopyRights(cg->auth_ref, &auth_rights,
+ kAuthorizationEmptyEnvironment,
+ auth_flags, NULL);
+ if (status == errAuthorizationSuccess)
+ status = AuthorizationMakeExternalForm(cg->auth_ref, &auth_extrn);
+
+ if (status == errAuthorizationSuccess)
+ {
+ /*
+ * Set the authorization string and return...
+ */
+
+ httpEncode64_2(buffer, sizeof(buffer), (void *)&auth_extrn,
+ sizeof(auth_extrn));
+
+ http->authstring = malloc(strlen(buffer) + 9);
+ sprintf(http->authstring, "AuthRef %s", buffer);
+
+ /* Copy back to _authstring for backwards compatibility */
+ strlcpy(http->_authstring, http->authstring, sizeof(http->_authstring));
+
+ DEBUG_printf(("cups_local_auth: Returning authstring = \"%s\"\n",
+ http->authstring));
+ return (0);
+ }
+ else if (status == errAuthorizationCanceled)
+ return (-1);
+
+ DEBUG_printf(("cups_local_auth: AuthorizationCopyRights() returned %d (%s)\n",
+ (int)status, cssmErrorString(status)));
+
+ /*
+ * Fall through to try certificates...
+ */
+ }
+#endif /* HAVE_AUTHORIZATION_H */
+
/*
* Try opening a certificate file for this PID. If that fails,
* try the root certificate...
fp = fopen(filename, "r");
}
- if (fp == NULL)
+ if (fp)
{
- DEBUG_printf(("cups_local_auth: Unable to open file %s: %s\n",
- filename, strerror(errno)));
- return (-1);
- }
+ /*
+ * Read the certificate from the file...
+ */
- /*
- * Read the certificate from the file...
- */
+ fgets(certificate, sizeof(certificate), fp);
+ fclose(fp);
- fgets(certificate, sizeof(certificate), fp);
- fclose(fp);
+ /*
+ * Set the authorization string and return...
+ */
- /*
- * Set the authorization string and return...
- */
+ http->authstring = malloc(strlen(certificate) + 10);
+ sprintf(http->authstring, "Local %s", certificate);
- snprintf(http->authstring, sizeof(http->authstring), "Local %s", certificate);
+ /* Copy back to _authstring for backwards compatibility */
+ strlcpy(http->_authstring, http->authstring, sizeof(http->_authstring));
- DEBUG_printf(("cups_local_auth: Returning authstring = \"%s\"\n",
- http->authstring));
+ DEBUG_printf(("cups_local_auth: Returning authstring = \"%s\"\n",
+ http->authstring));
- return (0);
+ return (0);
+ }
+
+ return (1);
#endif /* WIN32 || __EMX__ */
}
/*
- * End of "$Id: auth.c 6191 2007-01-10 16:48:37Z mike $".
+ * End of "$Id: auth.c 6253 2007-02-10 18:48:40Z mike $".
*/
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