/*

 * Authentication functions for CUPS.

 *

 * Copyright © 2007-2018 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 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

 * missing or damaged, see the license at "http://www.cups.org/".

 *

 * This file is subject to the Apple OS-Developed Software exception.

 */

/*

 * Include necessary headers...

 */

#include "cups-private.h"

#include <fcntl.h>

#include <sys/stat.h>

#if defined(_WIN32) || defined(__EMX__)

#  include <io.h>

#else

#  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...

 */

static const char *cups_auth_find(const char *www_authenticate, const char *scheme);

static const char *cups_auth_param(const char *scheme, const char *name, char *value, size_t valsize);

static const char *cups_auth_scheme(const char *www_authenticate, char *scheme, size_t schemesize);

#ifdef HAVE_GSSAPI

#  define CUPS_GSS_OK 0   /* Successfully set credentials */

#  define CUPS_GSS_NONE -1    /* No credentials */

#  define CUPS_GSS_FAIL -2    /* Failed credentials/authentication */

#  ifdef HAVE_GSS_ACQUIRE_CRED_EX_F

#    ifdef HAVE_GSS_GSSAPI_SPI_H

#      include <GSS/gssapi_spi.h>

#    else

#      define GSS_AUTH_IDENTITY_TYPE_1 1

#      define gss_acquire_cred_ex_f __ApplePrivate_gss_acquire_cred_ex_f

typedef struct gss_auth_identity /* @private@ */

{

  uint32_t type;

  uint32_t flags;

  char *username;

  char *realm;

  char *password;

  gss_buffer_t *credentialsRef;

} gss_auth_identity_desc;

extern OM_uint32 gss_acquire_cred_ex_f(gss_status_id_t, const gss_name_t,

               OM_uint32, OM_uint32, const gss_OID,

               gss_cred_usage_t, gss_auth_identity_t,

               void *, void (*)(void *, OM_uint32,

                                gss_status_id_t,

              gss_cred_id_t,

              gss_OID_set,

              OM_uint32));

#    endif /* HAVE_GSS_GSSAPI_SPI_H */

#    include <dispatch/dispatch.h>

typedef struct _cups_gss_acquire_s  /* Acquire callback data */

{

  dispatch_semaphore_t  sem;    /* Synchronization semaphore */

  OM_uint32   major;    /* Returned status code */

  gss_cred_id_t   creds;    /* Returned credentials */

} _cups_gss_acquire_t;

static void cups_gss_acquire(void *ctx, OM_uint32 major,

                     gss_status_id_t status,

         gss_cred_id_t creds, gss_OID_set oids,

         OM_uint32 time_rec);

#  endif /* HAVE_GSS_ACQUIRE_CRED_EX_F */

static gss_name_t cups_gss_getname(http_t *http, const char *service_name);

#  ifdef DEBUG

static void cups_gss_printf(OM_uint32 major_status, OM_uint32 minor_status,

        const char *message);

#  else

#    define cups_gss_printf(major, minor, message)

#  endif /* DEBUG */

#endif /* HAVE_GSSAPI */

static int  cups_local_auth(http_t *http);

/*

 * 'cupsDoAuthentication()' - Authenticate a request.

 *

 * This function should be called in response to a @code HTTP_STATUS_UNAUTHORIZED@

 * status, prior to resubmitting your request.

 *

 * @since CUPS 1.1.20/macOS 10.4@

 */

int         /* O - 0 on success, -1 on error */

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 */

    *www_auth,    /* WWW-Authenticate header */

    *schemedata;    /* Scheme-specific data */

  char    scheme[256],    /* Scheme name */

    prompt[1024];   /* Prompt for user */

  int   localauth;    /* Local authentication result */

  _cups_globals_t *cg;      /* Global data */

  DEBUG_printf(("cupsDoAuthentication(http=%p, method=\"%s\", resource=\"%s\")", (void *)http, method, resource));

  if (!http)

    http = _cupsConnect();

  if (!http || !method || !resource)

    return (-1);

  DEBUG_printf(("2cupsDoAuthentication: digest_tries=%d, userpass=\"%s\"",

                http->digest_tries, http->userpass));

  DEBUG_printf(("2cupsDoAuthentication: WWW-Authenticate=\"%s\"",

                httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE)));

 /*

  * Clear the current authentication string...

  */

  httpSetAuthString(http, NULL, NULL);

 /*

  * See if we can do local authentication...

  */

  if (http->digest_tries < 3)

  {

    if ((localauth = cups_local_auth(http)) == 0)

    {

      DEBUG_printf(("2cupsDoAuthentication: authstring=\"%s\"",

                    http->authstring));

      if (http->status == HTTP_STATUS_UNAUTHORIZED)

  http->digest_tries ++;

      return (0);

    }

    else if (localauth == -1)

    {

      http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;

      return (-1);      /* Error or canceled */

    }

  }

 /*

  * Nope, loop through the authentication schemes to find the first we support.

  */

  www_auth = httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE);

  for (schemedata = cups_auth_scheme(www_auth, scheme, sizeof(scheme)); schemedata; schemedata = cups_auth_scheme(schemedata + strlen(scheme), scheme, sizeof(scheme)))

  {

   /*

    * Check the scheme name...

    */

    DEBUG_printf(("2cupsDoAuthentication: Trying scheme \"%s\"...", scheme));

#ifdef HAVE_GSSAPI

    if (!_cups_strcasecmp(scheme, "Negotiate"))

    {

     /*

      * Kerberos authentication...

      */

      int gss_status;     /* Auth status */

      if ((gss_status = _cupsSetNegotiateAuthString(http, method, resource)) == CUPS_GSS_FAIL)

      {

        DEBUG_puts("1cupsDoAuthentication: Negotiate failed.");

  http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;

  return (-1);

      }

      else if (gss_status == CUPS_GSS_NONE)

      {

        DEBUG_puts("2cupsDoAuthentication: No credentials for Negotiate.");

        continue;

      }

      else

      {

        DEBUG_puts("2cupsDoAuthentication: Using Negotiate.");

        break;

      }

    }

    else

#endif /* HAVE_GSSAPI */

    if (_cups_strcasecmp(scheme, "Basic") && _cups_strcasecmp(scheme, "Digest"))

    {

     /*

      * Other schemes not yet supported...

      */

      DEBUG_printf(("2cupsDoAuthentication: Scheme \"%s\" not yet supported.", scheme));

      continue;

    }

   /*

    * See if we should retry the current username:password...

    */

    if ((http->digest_tries > 1 || !http->userpass[0]) && (!_cups_strcasecmp(scheme, "Basic") || (!_cups_strcasecmp(scheme, "Digest"))))

    {

     /*

      * Nope - get a new password from the user...

      */

      char default_username[HTTP_MAX_VALUE];

          /* Default username */

      cg = _cupsGlobals();

      if (!cg->lang_default)

  cg->lang_default = cupsLangDefault();

      if (cups_auth_param(schemedata, "username", default_username, sizeof(default_username)))

  cupsSetUser(default_username);

      snprintf(prompt, sizeof(prompt), _cupsLangString(cg->lang_default, _("Password for %s on %s? ")), cupsUser(), http->hostname[0] == '/' ? "localhost" : http->hostname);

      http->digest_tries  = _cups_strncasecmp(scheme, "Digest", 6) != 0;

      http->userpass[0]   = '\0';

      if ((password = cupsGetPassword2(prompt, http, method, resource)) == NULL)

      {

        DEBUG_puts("1cupsDoAuthentication: User canceled password request.");

  http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;

  return (-1);

      }

      snprintf(http->userpass, sizeof(http->userpass), "%s:%s", cupsUser(), password);

    }

    else if (http->status == HTTP_STATUS_UNAUTHORIZED)

      http->digest_tries ++;

    if (http->status == HTTP_STATUS_UNAUTHORIZED && http->digest_tries >= 3)

    {

      DEBUG_printf(("1cupsDoAuthentication: Too many authentication tries (%d)", http->digest_tries));

      http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;

      return (-1);

    }

   /*

    * Got a password; encode it for the server...

    */

    if (!_cups_strcasecmp(scheme, "Basic"))

    {

     /*

      * Basic authentication...

      */

      char  encode[256];    /* Base64 buffer */

      DEBUG_puts("2cupsDoAuthentication: Using Basic.");

      httpEncode64_2(encode, sizeof(encode), http->userpass, (int)strlen(http->userpass));

      httpSetAuthString(http, "Basic", encode);

      break;

    }

    else if (!_cups_strcasecmp(scheme, "Digest"))

    {

     /*

      * Digest authentication...

      */

      char nonce[HTTP_MAX_VALUE]; /* nonce="xyz" string */

      cups_auth_param(schemedata, "algorithm", http->algorithm, sizeof(http->algorithm));

      cups_auth_param(schemedata, "opaque", http->opaque, sizeof(http->opaque));

      cups_auth_param(schemedata, "nonce", nonce, sizeof(nonce));

      cups_auth_param(schemedata, "realm", http->realm, sizeof(http->realm));

      if (_httpSetDigestAuthString(http, nonce, method, resource))

      {

  DEBUG_puts("2cupsDoAuthentication: Using Basic.");

        break;

      }

    }

  }

  if (http->authstring)

  {

    DEBUG_printf(("1cupsDoAuthentication: authstring=\"%s\".", http->authstring));

    return (0);

  }

  else

  {

    DEBUG_puts("1cupsDoAuthentication: No supported schemes.");

    http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;

    return (-1);

  }

}

#ifdef HAVE_GSSAPI

/*

 * '_cupsSetNegotiateAuthString()' - Set the Kerberos authentication string.

 */

int         /* O - 0 on success, negative on error */

_cupsSetNegotiateAuthString(

    http_t     *http,     /* I - Connection to server */

    const char *method,     /* I - Request method ("GET", "POST", "PUT") */

    const char *resource)   /* I - Resource path */

{

  OM_uint32 minor_status,   /* Minor status code */

    major_status;   /* Major status code */

  gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;

          /* Output token */

  (void)method;

  (void)resource;

#  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("1_cupsSetNegotiateAuthString: Weak-linked GSSAPI/Kerberos "

               "framework is not present");

    return (CUPS_GSS_NONE);

  }

#  endif /* __APPLE__ */

  if (!strcmp(http->hostname, "localhost") || http->hostname[0] == '/' || isdigit(http->hostname[0] & 255) || !strchr(http->hostname, '.'))

  {

    DEBUG_printf(("1_cupsSetNegotiateAuthString: Kerberos not available for host \"%s\".", http->hostname));

    return (CUPS_GSS_NONE);

  }

  if (http->gssname == GSS_C_NO_NAME)

  {

    http->gssname = cups_gss_getname(http, _cupsGSSServiceName());

  }

  if (http->gssctx != GSS_C_NO_CONTEXT)

  {

    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_INTEG_FLAG,

              GSS_C_INDEFINITE,

              GSS_C_NO_CHANNEL_BINDINGS,

              GSS_C_NO_BUFFER, &http->gssmech,

              &output_token, NULL, NULL);

#  ifdef HAVE_GSS_ACQUIRE_CRED_EX_F

  if (major_status == GSS_S_NO_CRED)

  {

   /*

    * Ask the user for credentials...

    */

    char    prompt[1024], /* Prompt for user */

      userbuf[256]; /* Kerberos username */

    const char    *username,  /* Username string */

      *password;  /* Password string */

    _cups_gss_acquire_t data;   /* Callback data */

    gss_auth_identity_desc identity;  /* Kerberos user identity */

    _cups_globals_t *cg = _cupsGlobals();

          /* Per-thread global data */

    if (!cg->lang_default)

      cg->lang_default = cupsLangDefault();

    snprintf(prompt, sizeof(prompt),

             _cupsLangString(cg->lang_default, _("Password for %s on %s? ")),

       cupsUser(), http->gsshost);

    if ((password = cupsGetPassword2(prompt, http, method, resource)) == NULL)

      return (CUPS_GSS_FAIL);

   /*

    * Try to acquire credentials...

    */

    username = cupsUser();

    if (!strchr(username, '@'))

    {

      snprintf(userbuf, sizeof(userbuf), "%s@%s", username, http->gsshost);

      username = userbuf;

    }

    identity.type           = GSS_AUTH_IDENTITY_TYPE_1;

    identity.flags          = 0;

    identity.username       = (char *)username;

    identity.realm          = (char *)"";

    identity.password       = (char *)password;

    identity.credentialsRef = NULL;

    data.sem   = dispatch_semaphore_create(0);

    data.major = 0;

    data.creds = NULL;

    if (data.sem)

    {

      major_status = gss_acquire_cred_ex_f(NULL, GSS_C_NO_NAME, 0, GSS_C_INDEFINITE, GSS_KRB5_MECHANISM, GSS_C_INITIATE, (gss_auth_identity_t)&identity, &data, cups_gss_acquire);

      if (major_status == GSS_S_COMPLETE)

      {

  dispatch_semaphore_wait(data.sem, DISPATCH_TIME_FOREVER);

  major_status = data.major;

      }

      dispatch_release(data.sem);

      if (major_status == GSS_S_COMPLETE)

      {

        OM_uint32 release_minor;  /* Minor status from releasing creds */

  major_status = gss_init_sec_context(&minor_status, data.creds,

              &http->gssctx,

              http->gssname, http->gssmech,

              GSS_C_MUTUAL_FLAG | GSS_C_INTEG_FLAG,

              GSS_C_INDEFINITE,

              GSS_C_NO_CHANNEL_BINDINGS,

              GSS_C_NO_BUFFER, &http->gssmech,

              &output_token, NULL, NULL);

        gss_release_cred(&release_minor, &data.creds);

      }

    }

  }

#  endif /* HAVE_GSS_ACQUIRED_CRED_EX_F */

  if (major_status == GSS_S_NO_CRED)

  {

    cups_gss_printf(major_status, minor_status, "_cupsSetNegotiateAuthString: No credentials");

    return (CUPS_GSS_NONE);

  }

  else if (GSS_ERROR(major_status))

  {

    cups_gss_printf(major_status, minor_status, "_cupsSetNegotiateAuthString: Unable to initialize security context");

    return (CUPS_GSS_FAIL);

  }

#  ifdef DEBUG

  else if (major_status == GSS_S_CONTINUE_NEEDED)

    cups_gss_printf(major_status, minor_status, "_cupsSetNegotiateAuthString: Continuation needed");

#  endif /* DEBUG */

  if (output_token.length > 0 && output_token.length <= 65536)

  {

   /*

    * Allocate the authorization string since Windows KDCs can have

    * arbitrarily large credentials...

    */

    int authsize = 10 +     /* "Negotiate " */

       (((int)output_token.length * 4 / 3 + 3) & ~3) + 1;

            /* Base64 + nul */

    httpSetAuthString(http, NULL, NULL);

    if ((http->authstring = malloc((size_t)authsize)) == NULL)

    {

      http->authstring = http->_authstring;

      authsize         = sizeof(http->_authstring);

    }

    strlcpy(http->authstring, "Negotiate ", (size_t)authsize);

    httpEncode64_2(http->authstring + 10, authsize - 10, output_token.value,

       (int)output_token.length);

    gss_release_buffer(&minor_status, &output_token);

  }

  else

  {

    DEBUG_printf(("1_cupsSetNegotiateAuthString: Kerberos credentials too "

                  "large - %d bytes!", (int)output_token.length));

    gss_release_buffer(&minor_status, &output_token);

    return (CUPS_GSS_FAIL);

  }

  return (CUPS_GSS_OK);

}

#endif /* HAVE_GSSAPI */

/*

 * 'cups_auth_find()' - Find the named WWW-Authenticate scheme.

 *

 * The "www_authenticate" parameter points to the current position in the header.

 *

 * Returns @code NULL@ if the auth scheme is not present.

 */

static const char *       /* O - Start of matching scheme or @code NULL@ if not found */

cups_auth_find(const char *www_authenticate,  /* I - Pointer into WWW-Authenticate header */

               const char *scheme)    /* I - Authentication scheme */

{

  size_t  schemelen = strlen(scheme); /* Length of scheme */

  DEBUG_printf(("8cups_auth_find(www_authenticate=\"%s\", scheme=\"%s\"(%d))", www_authenticate, scheme, (int)schemelen));

  while (*www_authenticate)

  {

   /*

    * Skip leading whitespace and commas...

    */

    DEBUG_printf(("9cups_auth_find: Before whitespace: \"%s\"", www_authenticate));

    while (isspace(*www_authenticate & 255) || *www_authenticate == ',')

      www_authenticate ++;

    DEBUG_printf(("9cups_auth_find: After whitespace: \"%s\"", www_authenticate));

   /*

    * See if this is "Scheme" followed by whitespace or the end of the string.

    */

    if (!strncmp(www_authenticate, scheme, schemelen) && (isspace(www_authenticate[schemelen] & 255) || www_authenticate[schemelen] == ',' || !www_authenticate[schemelen]))

    {

     /*

      * Yes, this is the start of the scheme-specific information...

      */

      DEBUG_printf(("9cups_auth_find: Returning \"%s\".", www_authenticate));

      return (www_authenticate);

    }

   /*

    * Skip the scheme name or param="value" string...

    */

    while (!isspace(*www_authenticate & 255) && *www_authenticate)

    {

      if (*www_authenticate == '\"')

      {

       /*

        * Skip quoted value...

        */

        www_authenticate ++;

        while (*www_authenticate && *www_authenticate != '\"')

          www_authenticate ++;

        DEBUG_printf(("9cups_auth_find: After quoted: \"%s\"", www_authenticate));

      }

      www_authenticate ++;

    }

    DEBUG_printf(("9cups_auth_find: After skip: \"%s\"", www_authenticate));

  }

  DEBUG_puts("9cups_auth_find: Returning NULL.");

  return (NULL);

}

/*

 * 'cups_auth_param()' - Copy the value for the named authentication parameter,

 *                       if present.

 */

static const char *       /* O - Parameter value or @code NULL@ if not present */

cups_auth_param(const char *scheme,   /* I - Pointer to auth data */

                const char *name,   /* I - Name of parameter */

                char       *value,    /* I - Value buffer */

                size_t     valsize)   /* I - Size of value buffer */

{

  char    *valptr = value,    /* Pointer into value buffer */

    *valend = value + valsize - 1;  /* Pointer to end of buffer */

  size_t  namelen = strlen(name);   /* Name length */

  int   param;        /* Is this a parameter? */

  DEBUG_printf(("8cups_auth_param(scheme=\"%s\", name=\"%s\", value=%p, valsize=%d)", scheme, name, (void *)value, (int)valsize));

  while (!isspace(*scheme & 255) && *scheme)

    scheme ++;

  while (*scheme)

  {

    while (isspace(*scheme & 255) || *scheme == ',')

      scheme ++;

    if (!strncmp(scheme, name, namelen) && scheme[namelen] == '=')

    {

     /*

      * Found the parameter, copy the value...

      */

      scheme += namelen + 1;

      if (*scheme == '\"')

      {

        scheme ++;

  while (*scheme && *scheme != '\"')

  {

    if (valptr < valend)

      *valptr++ = *scheme;

    scheme ++;

  }

      }

      else

      {

  while (*scheme && strchr("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~+/=", *scheme))

  {

    if (valptr < valend)

      *valptr++ = *scheme;

    scheme ++;

  }

      }

      *valptr = '\0';

      DEBUG_printf(("9cups_auth_param: Returning \"%s\".", value));

      return (value);

    }

   /*

    * Skip the param=value string...

    */

    param = 0;

    while (!isspace(*scheme & 255) && *scheme)

    {

      if (*scheme == '=')

        param = 1;

      else if (*scheme == '\"')

      {

       /*

        * Skip quoted value...

        */

        scheme ++;

        while (*scheme && *scheme != '\"')

          scheme ++;

      }

      scheme ++;

    }

   /*

    * If this wasn't a parameter, we are at the end of this scheme's

    * parameters...

    */

    if (!param)

      break;

  }

  *value = '\0';

  DEBUG_puts("9cups_auth_param: Returning NULL.");

  return (NULL);

}

/*

 * 'cups_auth_scheme()' - Get the (next) WWW-Authenticate scheme.

 *

 * The "www_authenticate" parameter points to the current position in the header.

 *

 * Returns @code NULL@ if there are no (more) auth schemes present.

 */

static const char *       /* O - Start of scheme or @code NULL@ if not found */

cups_auth_scheme(const char *www_authenticate,  /* I - Pointer into WWW-Authenticate header */

     char       *scheme,    /* I - Scheme name buffer */

     size_t     schemesize)   /* I - Size of buffer */

{

  const char  *start;       /* Start of scheme data */

  char    *sptr = scheme,     /* Pointer into scheme buffer */

    *send = scheme + schemesize - 1;/* End of scheme buffer */

  int   param;        /* Is this a parameter? */

  DEBUG_printf(("8cups_auth_scheme(www_authenticate=\"%s\", scheme=%p, schemesize=%d)", www_authenticate, (void *)scheme, (int)schemesize));

  while (*www_authenticate)

  {

   /*

    * Skip leading whitespace and commas...

    */

    while (isspace(*www_authenticate & 255) || *www_authenticate == ',')

      www_authenticate ++;

   /*

    * Parse the scheme name or param="value" string...

    */

    for (sptr = scheme, start = www_authenticate, param = 0; *www_authenticate && *www_authenticate != ',' && !isspace(*www_authenticate & 255); www_authenticate ++)

    {

      if (*www_authenticate == '=')

        param = 1;

      else if (!param && sptr < send)

        *sptr++ = *www_authenticate;

      else if (*www_authenticate == '\"')

      {

       /*

        * Skip quoted value...

        */

        www_authenticate ++;

        while (*www_authenticate && *www_authenticate != '\"')

          www_authenticate ++;

      }

    }

    if (sptr > scheme && !param)

    {

      *sptr = '\0';

      DEBUG_printf(("9cups_auth_scheme: Returning \"%s\".", start));

      return (start);

    }

  }

  *scheme = '\0';

  DEBUG_puts("9cups_auth_scheme: Returning NULL.");

  return (NULL);

}

#ifdef HAVE_GSSAPI

#  ifdef HAVE_GSS_ACQUIRE_CRED_EX_F

/*

 * 'cups_gss_acquire()' - Kerberos credentials callback.

 */

static void

cups_gss_acquire(

    void            *ctx,   /* I - Caller context */

    OM_uint32       major,    /* I - Major error code */

    gss_status_id_t status,   /* I - Status (unused) */

    gss_cred_id_t   creds,    /* I - Credentials (if any) */

    gss_OID_set     oids,   /* I - Mechanism OIDs (unused) */

    OM_uint32       time_rec)   /* I - Timestamp (unused) */

{

  uint32_t    min;    /* Minor error code */

  _cups_gss_acquire_t *data;    /* Callback data */

  (void)status;

  (void)time_rec;

  data        = (_cups_gss_acquire_t *)ctx;

  data->major = major;

  data->creds = creds;

  gss_release_oid_set(&min, &oids);

  dispatch_semaphore_signal(data->sem);

}

#  endif /* HAVE_GSS_ACQUIRE_CRED_EX_F */

/*

 * 'cups_gss_getname()' - Get CUPS service credentials for authentication.

 */

static gss_name_t     /* O - Server name */

cups_gss_getname(

    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 */

  DEBUG_printf(("7cups_gss_getname(http=%p, service_name=\"%s\")", http,

                service_name));

 /*

  * Get the hostname...

  */

  if (!http->gsshost[0])

  {

    httpGetHostname(http, http->gsshost, sizeof(http->gsshost));

    if (!strcmp(http->gsshost, "localhost"))

    {

      if (gethostname(http->gsshost, sizeof(http->gsshost)) < 0)

      {

  DEBUG_printf(("1cups_gss_getname: gethostname() failed: %s",

          strerror(errno)));

  http->gsshost[0] = '\0';

  return (NULL);

      }

      if (!strchr(http->gsshost, '.'))

      {

       /*

  * The hostname is not a FQDN, so look it up...

  */

  struct hostent  *host;    /* Host entry to get FQDN */

  if ((host = gethostbyname(http->gsshost)) != NULL && host->h_name)

  {

   /*

    * Use the resolved hostname...

    */

    strlcpy(http->gsshost, host->h_name, sizeof(http->gsshost));

  }

  else

  {

    DEBUG_printf(("1cups_gss_getname: gethostbyname(\"%s\") failed.",

      http->gsshost));

    http->gsshost[0] = '\0';

    return (NULL);

  }

      }

    }

  }

 /*

  * Get a service name we can use for authentication purposes...

  */

  snprintf(buf, sizeof(buf), "%s@%s", service_name, http->gsshost);

  DEBUG_printf(("8cups_gss_getname: Looking up \"%s\".", 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))

  {

    cups_gss_printf(major_status, minor_status,

                    "cups_gss_getname: gss_import_name() failed");

    return (NULL);

  }

  return (server_name);

}

#  ifdef DEBUG

/*

 * 'cups_gss_printf()' - Show debug error messages from GSSAPI.

 */

static void

cups_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))

    gss_display_status(&err_minor_status, minor_status, GSS_C_MECH_CODE,

           GSS_C_NULL_OID, &msg_ctx, &minor_status_string);

  DEBUG_printf(("1%s: %s, %s", 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 */

#endif /* HAVE_GSSAPI */

/*

 * 'cups_local_auth()' - Get the local authorization certificate if

 *                       available/applicable.

 */

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);

#else

  int     pid;    /* Current process ID */

  FILE      *fp;    /* Certificate file */

  char      trc[16],  /* Try Root Certificate parameter */

      filename[1024]; /* Certificate filename */

  const char    *www_auth,  /* WWW-Authenticate header */

      *schemedata;  /* Data for the named auth scheme */

  _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(("7cups_local_auth(http=%p) hostaddr=%s, hostname=\"%s\"", (void *)http, httpAddrString(http->hostaddr, filename, sizeof(filename)), http->hostname));

 /*

  * See if we are accessing localhost...

  */

  if (!httpAddrLocalhost(http->hostaddr) && _cups_strcasecmp(http->hostname, "localhost") != 0)

  {

    DEBUG_puts("8cups_local_auth: Not a local connection!");

    return (1);

  }

  www_auth = httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE);

#  if defined(HAVE_AUTHORIZATION_H)

 /*

  * Delete any previous authorization reference...

  */

  if (http->auth_ref)

  {

    AuthorizationFree(http->auth_ref, kAuthorizationFlagDefaults);

    http->auth_ref = NULL;

  }

  if (!getenv("GATEWAY_INTERFACE") && (schemedata = cups_auth_find(www_auth, "AuthRef")) != NULL && cups_auth_param(schemedata, "key", auth_key, sizeof(auth_key)))

  {

    status = AuthorizationCreate(NULL, kAuthorizationEmptyEnvironment, kAuthorizationFlagDefaults, &http->auth_ref);

    if (status != errAuthorizationSuccess)

    {

      DEBUG_printf(("8cups_local_auth: AuthorizationCreate() returned %d (%s)",

        (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...

      */