/*
- * "$Id: auth.c 6397 2007-03-25 23:33:32Z mike $"
+ * "$Id: auth.c 6779 2007-08-08 19:49:48Z mike $"
*
* Authentication functions for the Common UNIX Printing System (CUPS).
*
+ * Copyright 2007-2008 by Apple Inc.
* 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
- * "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
- *
- * Voice: (301) 373-9600
- * EMail: cups-info@cups.org
- * WWW: http://www.cups.org
+ * 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.
*
# 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 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 */
/*
* 'cupsDoAuthentication()' - Authenticate a request.
*
- * This function should be called in response to a HTTP_UNAUTHORIZED
+ * This function should be called in response to a @code HTTP_UNAUTHORIZED@
* status, prior to resubmitting your request.
*
* @since CUPS 1.1.20@
*/
int /* O - 0 on success, -1 on error */
-cupsDoAuthentication(http_t *http, /* I - HTTP connection to server */
- const char *method,/* I - Request method (GET, POST, PUT) */
+cupsDoAuthentication(http_t *http, /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
+ const char *method,/* I - Request method ("GET", "POST", "PUT") */
const char *resource)
/* I - Resource path */
{
const char *password; /* Password string */
char prompt[1024], /* Prompt for user */
realm[HTTP_MAX_VALUE], /* realm="xyz" string */
- nonce[HTTP_MAX_VALUE], /* nonce="xyz" string */
- encode[2048]; /* Encoded username:password */
+ nonce[HTTP_MAX_VALUE]; /* nonce="xyz" string */
int localauth; /* Local authentication result */
_cups_globals_t *cg; /* Global data */
* Clear the current authentication string...
*/
- http->_authstring[0] = '\0';
-
- if (http->authstring && http->authstring != http->_authstring)
- free(http->authstring);
-
- http->authstring = http->_authstring;
+ httpSetAuthString(http, NULL, NULL);
/*
* See if we can do local authentication...
/* Input token */
char *gss_service_name;
/* GSS service name */
+# ifdef USE_SPNEGO
const char *authorization;
/* Pointer into Authorization string */
+# endif /* USE_SPNEGO */
# ifdef __APPLE__
}
# 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)
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...
*/
if (*authorization)
{
/*
- * For SPNEGO, this is where we'll feed the server's authorization data
- * back into gss via input_token...
+ * Decode the authorization string to get the input token...
*/
- }
- else
- {
- if (http->gssctx != GSS_C_NO_CONTEXT)
+
+ 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
{
- major_status = gss_delete_sec_context(&minor_status, &http->gssctx,
- GSS_C_NO_BUFFER);
- http->gssctx = GSS_C_NO_CONTEXT;
+ 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_MUTUAL_FLAG, GSS_C_INDEFINITE,
+ 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);
{
# ifdef DEBUG
DEBUG_gss_printf(major_status, minor_status,
- "Unable to initialise security context");
+ "Unable to initialize 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)
+ if (output_token.length > 0 && output_token.length <= 65536)
{
- httpEncode64_2(encode, sizeof(encode), output_token.value,
- output_token.length);
+ /*
+ * Allocate the authorization string since Windows KDCs can have
+ * arbitrarily large credentials...
+ */
+
+ int authsize = 10 + /* "Negotiate " */
+ output_token.length * 4 / 3 + 1 + /* Base64 */
+ 1; /* nul */
- http->authstring = malloc(strlen(encode) + 11);
- sprintf(http->authstring, "Negotiate %s", encode); /* Safe because allocated */
+ httpSetAuthString(http, NULL, NULL);
+
+ if ((http->authstring = malloc(authsize)) == NULL)
+ {
+ http->authstring = http->_authstring;
+ authsize = sizeof(http->_authstring);
+ }
+
+ strcpy(http->authstring, "Negotiate ");
+ httpEncode64_2(http->authstring + 10, authsize - 10, output_token.value,
+ output_token.length);
major_status = gss_release_buffer(&minor_status, &output_token);
}
+ else
+ {
+ DEBUG_printf(("cupsDoAuthentication: Kerberos credentials too large - "
+ "%d bytes!\n", output_token.length));
- /*
- * Copy back what we can to _authstring for backwards compatibility...
- */
+ major_status = gss_release_buffer(&minor_status, &output_token);
- strlcpy(http->_authstring, http->authstring, sizeof(http->_authstring));
+ return (-1);
+ }
#endif /* HAVE_GSSAPI */
}
else if (strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Digest", 6))
* Basic authentication...
*/
+ char encode[256]; /* Base64 buffer */
+
+
httpEncode64_2(encode, sizeof(encode), http->userpass,
(int)strlen(http->userpass));
- snprintf(http->_authstring, sizeof(http->_authstring), "Basic %s", encode);
+ httpSetAuthString(http, "Basic", encode);
}
else
{
* Digest authentication...
*/
+ char encode[33], /* MD5 buffer */
+ 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));
{
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 */
+ 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,
- httpGetHostname(http, fqdn, sizeof(fqdn)));
+ 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);
*/
static int /* O - 0 if available */
- /* 1 if not available */
+ /* 1 if not available */
/* -1 error */
cups_local_auth(http_t *http) /* I - HTTP connection to server */
{
* 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 */
_cups_globals_t *cg = _cupsGlobals(); /* Global data */
-#if defined(HAVE_AUTHORIZATION_H)
+# if defined(HAVE_AUTHORIZATION_H)
OSStatus status; /* Status */
AuthorizationItem auth_right; /* Authorization right */
AuthorizationRights auth_rights; /* Authorization rights */
AuthorizationExternalForm auth_extrn; /* Authorization ref external */
char auth_key[1024]; /* Buffer */
char buffer[1024]; /* Buffer */
-#endif /* HAVE_AUTHORIZATION_H */
+# 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)
+# if defined(HAVE_AUTHORIZATION_H)
/*
* Delete any previous authorization reference...
*/
- if (cg->auth_ref)
+ if (http->auth_ref)
{
- AuthorizationFree(cg->auth_ref, kAuthorizationFlagDefaults);
- cg->auth_ref = NULL;
+ 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, &cg->auth_ref);
+ kAuthorizationFlagDefaults, &http->auth_ref);
if (status != errAuthorizationSuccess)
{
DEBUG_printf(("cups_local_auth: AuthorizationCreate() returned %d (%s)\n",
kAuthorizationFlagInteractionAllowed |
kAuthorizationFlagExtendRights;
- status = AuthorizationCopyRights(cg->auth_ref, &auth_rights,
+ status = AuthorizationCopyRights(http->auth_ref, &auth_rights,
kAuthorizationEmptyEnvironment,
auth_flags, NULL);
if (status == errAuthorizationSuccess)
- status = AuthorizationMakeExternalForm(cg->auth_ref, &auth_extrn);
+ status = AuthorizationMakeExternalForm(http->auth_ref, &auth_extrn);
if (status == errAuthorizationSuccess)
{
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));
+ httpSetAuthString(http, "AuthRef", buffer);
DEBUG_printf(("cups_local_auth: Returning authstring = \"%s\"\n",
http->authstring));
* Fall through to try certificates...
*/
}
-#endif /* HAVE_AUTHORIZATION_H */
+# endif /* HAVE_AUTHORIZATION_H */
/*
* Try opening a certificate file for this PID. If that fails,
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");
}
* Set the authorization string and return...
*/
- http->authstring = malloc(strlen(certificate) + 10);
- sprintf(http->authstring, "Local %s", certificate);
-
- /* Copy back to _authstring for backwards compatibility */
- strlcpy(http->_authstring, http->authstring, sizeof(http->_authstring));
+ httpSetAuthString(http, "Local", certificate);
DEBUG_printf(("cups_local_auth: Returning authstring = \"%s\"\n",
http->authstring));
return (0);
}
+# if defined(SO_PEERCRED) && defined(AF_LOCAL)
+ /*
+ * See if we can authenticate using the peer credentials provided over a
+ * domain socket; if so, specify "PeerCred username" as the authentication
+ * information...
+ */
+
+ 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 */
+
+ username = cupsUser();
+
+ if ((pwd = getpwnam(username)) != NULL && pwd->pw_uid == getuid())
+ {
+ httpSetAuthString(http, "PeerCred", username);
+
+ DEBUG_printf(("cups_local_auth: Returning authstring = \"%s\"\n",
+ http->authstring));
+
+ return (0);
+ }
+ }
+# endif /* SO_PEERCRED && AF_LOCAL */
+
return (1);
#endif /* WIN32 || __EMX__ */
}
/*
- * End of "$Id: auth.c 6397 2007-03-25 23:33:32Z mike $".
+ * End of "$Id: auth.c 6779 2007-08-08 19:49:48Z mike $".
*/
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