/*
- * "$Id: auth.c 5558 2006-05-21 13:58:56Z mike $"
+ * "$Id: auth.c 6779 2007-08-08 19:49:48Z mike $"
*
* Authentication functions for the Common UNIX Printing System (CUPS).
*
- * Copyright 1997-2006 by Easy Software Products.
+ * Copyright 2007 by Apple Inc.
+ * Copyright 1997-2007 by Easy Software Products.
*
- * 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
- * "LICENSE.txt" which should have been included with this file. If this
- * file is missing or damaged please contact Easy Software Products
- * at:
- *
- * Attn: CUPS Licensing Information
- * Easy Software Products
- * 44141 Airport View Drive, Suite 204
- * Hollywood, Maryland 20636 USA
+ * This file contains Kerberos support code, copyright 2006 by
+ * Jelmer Vernooij.
*
- * Voice: (301) 373-9600
- * EMail: cups-info@cups.org
- * WWW: http://www.cups.org
+ * These coded instructions, statements, and computer programs are the
+ * property of Apple Inc. and are protected by Federal copyright
+ * law. Distribution and use rights are outlined in the file "LICENSE.txt"
+ * which should have been included with this file. If this file is
+ * file is missing or damaged, see the license at "http://www.cups.org/".
*
* This file is subject to the Apple OS-Developed Software exception.
*
* 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 */
+
+#if defined(SO_PEERCRED) && defined(AF_LOCAL)
+# include <pwd.h>
+#endif /* SO_PEERCRED && AF_LOCAL */
+
/*
* Local functions...
*/
+#ifdef HAVE_GSSAPI
+# ifdef DEBUG
+static void DEBUG_gss_printf(OM_uint32 major_status, OM_uint32 minor_status,
+ const char *message);
+# else
+# define DEBUG_gss_printf(major, minor, 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[4096]; /* Encoded username:password */
+ int localauth; /* Local authentication result */
+ _cups_globals_t *cg; /* Global data */
DEBUG_printf(("cupsDoAuthentication(http=%p, method=\"%s\", resource=\"%s\")\n",
http, method, resource));
DEBUG_printf(("cupsDoAuthentication: digest_tries=%d, userpass=\"%s\"\n",
http->digest_tries, http->userpass));
+ DEBUG_printf(("cupsDoAuthentication: WWW-Authenticate=\"%s\"\n",
+ httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE)));
/*
* Clear the current authentication string...
*/
- http->authstring[0] = '\0';
+ httpSetAuthString(http, NULL, NULL);
/*
* 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...
*/
- snprintf(prompt, sizeof(prompt), _("Password for %s on %s? "), cupsUser(),
- http->hostname[0] == '/' ? "localhost" : http->hostname);
+ cg = _cupsGlobals();
+
+ if (!cg->lang_default)
+ cg->lang_default = cupsLangDefault();
+
+ snprintf(prompt, sizeof(prompt),
+ _cupsLangString(cg->lang_default, _("Password for %s on %s? ")),
+ cupsUser(),
+ http->hostname[0] == '/' ? "localhost" : http->hostname);
http->digest_tries = strncasecmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE],
"Digest", 5) != 0;
* 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 */
+# ifdef USE_SPNEGO
+ const char *authorization;
+ /* Pointer into Authorization string */
+# endif /* USE_SPNEGO */
+
+
+# ifdef __APPLE__
+ /*
+ * If the weak-linked GSSAPI/Kerberos library is not present, don't try
+ * to use it...
+ */
+
+ if (gss_init_sec_context == NULL)
+ {
+ DEBUG_puts("cupsDoAuthentication: Weak-linked GSSAPI/Kerberos framework "
+ "is not present");
+ return (-1);
+ }
+# endif /* __APPLE__ */
+
+ if (http->status == HTTP_UNAUTHORIZED && http->digest_tries >= 3)
+ {
+ DEBUG_printf(("cupsDoAuthentication: too many Negotiate tries (%d)\n",
+ http->digest_tries));
+
+ return (-1);
+ }
+
+ 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);
+ }
+
+# ifdef USE_SPNEGO /* We don't implement SPNEGO just yet... */
+ /*
+ * 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)
+ {
+ /*
+ * Decode the authorization string to get the input token...
+ */
+
+ int len = strlen(authorization);
+
+ input_token.value = malloc(len);
+ input_token.value = httpDecode64_2(input_token.value, &len,
+ authorization);
+ input_token.length = len;
+
+# ifdef DEBUG
+ {
+ char *ptr = (char *)input_token.value;
+ int left = len;
+
+ fputs("input_token=", stdout);
+ while (left > 0)
+ {
+ if (*ptr < ' ')
+ printf("\\%03o", *ptr & 255);
+ else
+ putchar(*ptr);
+ ptr ++;
+ left --;
+ }
+ putchar('\n');
+ }
+# endif /* DEBUG */
+ }
+# endif /* USE_SPNEGO */
+
+ 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_DELEG_FLAG | GSS_C_MUTUAL_FLAG |
+ GSS_C_INTEG_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 initialize security context");
+# endif /* DEBUG */
+ return (-1);
+ }
+
+ if (major_status == GSS_S_CONTINUE_NEEDED)
+ DEBUG_gss_printf(major_status, minor_status, "Continuation needed!");
+
+ if (output_token.length)
+ {
+ httpEncode64_2(encode, sizeof(encode), output_token.value,
+ output_token.length);
+ httpSetAuthString(http, "Negotiate", encode);
+
+ major_status = gss_release_buffer(&minor_status, &output_token);
+ }
+#endif /* HAVE_GSSAPI */
+ }
+ else if (strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Digest", 6))
{
/*
* Basic authentication...
*/
httpEncode64_2(encode, sizeof(encode), http->userpass,
- strlen(http->userpass));
- snprintf(http->authstring, sizeof(http->authstring), "Basic %s", encode);
+ (int)strlen(http->userpass));
+ httpSetAuthString(http, "Basic", encode);
}
else
{
* Digest authentication...
*/
+ char digest[1024]; /* Digest auth data */
+
+
httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "realm", realm);
httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "nonce", nonce);
httpMD5(cupsUser(), realm, strchr(http->userpass, ':') + 1, encode);
httpMD5Final(nonce, method, resource, encode);
- snprintf(http->authstring, sizeof(http->authstring),
- "Digest username=\"%s\", realm=\"%s\", nonce=\"%s\", "
- "uri=\"%s\", response=\"%s\"", cupsUser(), realm, nonce,
- resource, encode);
+ snprintf(digest, sizeof(digest),
+ "username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", "
+ "response=\"%s\"", cupsUser(), realm, nonce, resource, encode);
+ httpSetAuthString(http, "Digest", digest);
}
DEBUG_printf(("cupsDoAuthentication: authstring=\"%s\"\n", http->authstring));
}
+#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 the hostname...
+ */
+
+ httpGetHostname(http, fqdn, sizeof(fqdn));
+
+ if (!strcmp(fqdn, "localhost"))
+ httpGetHostname(NULL, fqdn, sizeof(fqdn));
+
+ /*
+ * Get a server name we can use for authentication purposes...
+ */
+
+ snprintf(buf, sizeof(buf), "%s@%s", service_name, fqdn);
+
+ DEBUG_printf(("cups_get_gss_creds: Looking up %s...\n", buf));
+
+ 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__)
* Currently WIN32 and OS-2 do not support the CUPS server...
*/
- return (-1);
+ 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",
strcasecmp(http->hostname, "localhost") != 0)
{
DEBUG_puts("cups_local_auth: Not a local connection!");
- return (-1);
+ return (1);
}
+# if defined(HAVE_AUTHORIZATION_H)
+ /*
+ * Delete any previous authorization reference...
+ */
+
+ if (http->auth_ref)
+ {
+ AuthorizationFree(http->auth_ref, kAuthorizationFlagDefaults);
+ http->auth_ref = NULL;
+ }
+
+ if (httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
+ auth_key, sizeof(auth_key)))
+ {
+ status = AuthorizationCreate(NULL, kAuthorizationEmptyEnvironment,
+ kAuthorizationFlagDefaults, &http->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(http->auth_ref, &auth_rights,
+ kAuthorizationEmptyEnvironment,
+ auth_flags, NULL);
+ if (status == errAuthorizationSuccess)
+ status = AuthorizationMakeExternalForm(http->auth_ref, &auth_extrn);
+
+ if (status == errAuthorizationSuccess)
+ {
+ /*
+ * Set the authorization string and return...
+ */
+
+ httpEncode64_2(buffer, sizeof(buffer), (void *)&auth_extrn,
+ sizeof(auth_extrn));
+
+ httpSetAuthString(http, "AuthRef", buffer);
+
+ 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...
DEBUG_printf(("cups_local_auth: Unable to open file %s: %s\n",
filename, strerror(errno)));
+#ifdef HAVE_GSSAPI
+ /*
+ * If local certificate authentication isn't available for this PID,
+ * check if we need Kerberos authentication...
+ */
+
+ if (!strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9))
+ {
+ /*
+ * Yes, don't try the root certificate...
+ */
+
+ return (1);
+ }
+#endif /* HAVE_GSSAPI */
+
snprintf(filename, sizeof(filename), "%s/certs/0", cg->cups_statedir);
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...
+ */
+
+ fgets(certificate, sizeof(certificate), fp);
+ fclose(fp);
+
+ /*
+ * Set the authorization string and return...
+ */
+
+ httpSetAuthString(http, "Local", certificate);
+
+ DEBUG_printf(("cups_local_auth: Returning authstring = \"%s\"\n",
+ http->authstring));
+
+ return (0);
}
+# if defined(SO_PEERCRED) && defined(AF_LOCAL)
/*
- * Read the certificate from the file...
+ * See if we can authenticate using the peer credentials provided over a
+ * domain socket; if so, specify "PeerCred username" as the authentication
+ * information...
*/
- fgets(certificate, sizeof(certificate), fp);
- fclose(fp);
+ if (http->hostaddr->addr.sa_family == AF_LOCAL &&
+ !getenv("GATEWAY_INTERFACE")) /* Not via CGI programs... */
+ {
+ /*
+ * Verify that the current cupsUser() matches the current UID...
+ */
+
+ struct passwd *pwd; /* Password information */
+ const char *username; /* Current username */
- /*
- * Set the authorization string and return...
- */
+ username = cupsUser();
- snprintf(http->authstring, sizeof(http->authstring), "Local %s", certificate);
+ if ((pwd = getpwnam(username)) != NULL && pwd->pw_uid == getuid())
+ {
+ httpSetAuthString(http, "PeerCred", username);
- 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);
+ }
+ }
+# endif /* SO_PEERCRED && AF_LOCAL */
+
+ return (1);
#endif /* WIN32 || __EMX__ */
}
/*
- * End of "$Id: auth.c 5558 2006-05-21 13:58:56Z mike $".
+ * End of "$Id: auth.c 6779 2007-08-08 19:49:48Z mike $".
*/
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