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auth.c
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auth.c
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/*
* Authentication functions for CUPS.
*
* Copyright 2007-2019 by Apple Inc.
* Copyright 1997-2007 by Easy Software Products.
*
* This file contains Kerberos support code, copyright 2006 by
* Jelmer Vernooij.
*
* Licensed under Apache License v2.0. See the file "LICENSE" for more information.
*/
/*
* Include necessary headers...
*/
#include "cups-private.h"
#include "debug-internal.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>
#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_is_local_connection(http_t *http);
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") && !cups_is_local_connection(http))
{
/*
* Kerberos authentication to remote server...
*/
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") &&
_cups_strcasecmp(scheme, "Negotiate"))
{
/*
* 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])
{
/*
* 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 Digest.");
break;
}
}
}
if (http->authstring && http->authstring[0])
{
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 */
# 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);
}
}
}
# else
(void)method;
(void)resource;
# 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...
*/
do
www_authenticate ++;
while (*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 */
static int /* O - 0 if not a local connection */
/* 1 if local connection */
cups_is_local_connection(http_t *http) /* I - HTTP connection to server */
{
if (!httpAddrLocalhost(http->hostaddr) && _cups_strcasecmp(http->hostname, "localhost") != 0)
return 0;
return 1;
}
/*
* '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 (!cups_is_local_connection(http))
{
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",
(int)status));
return (-1);
}
auth_right.name = auth_key;