libvirt/src/util/virauth.c

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/*
* virauth.c: authentication related utility functions
*
* Copyright (C) 2012 Red Hat, Inc.
* Copyright (C) 2010 Matthias Bolte <matthias.bolte@googlemail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*
*/
#include <config.h>
#include <stdlib.h>
#include "virauth.h"
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#include "virutil.h"
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#include "viralloc.h"
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#include "virlog.h"
#include "datatypes.h"
#include "virerror.h"
#include "configmake.h"
#include "virauthconfig.h"
#include "virstring.h"
#define VIR_FROM_THIS VIR_FROM_AUTH
int
virAuthGetConfigFilePathURI(virURIPtr uri,
char **path)
{
int ret = -1;
size_t i;
const char *authenv = virGetEnvBlockSUID("LIBVIRT_AUTH_FILE");
char *userdir = NULL;
*path = NULL;
VIR_DEBUG("Determining auth config file path");
if (authenv) {
VIR_DEBUG("Using path from env '%s'", authenv);
if (VIR_STRDUP(*path, authenv) < 0)
goto cleanup;
return 0;
}
if (uri) {
for (i = 0; i < uri->paramsCount; i++) {
if (STREQ_NULLABLE(uri->params[i].name, "authfile") &&
uri->params[i].value) {
VIR_DEBUG("Using path from URI '%s'", uri->params[i].value);
if (VIR_STRDUP(*path, uri->params[i].value) < 0)
goto cleanup;
return 0;
}
}
}
if (!(userdir = virGetUserConfigDirectory()))
goto cleanup;
if (virAsprintf(path, "%s/auth.conf", userdir) < 0)
goto cleanup;
VIR_DEBUG("Checking for readability of '%s'", *path);
if (access(*path, R_OK) == 0)
goto done;
VIR_FREE(*path);
if (VIR_STRDUP(*path, SYSCONFDIR "/libvirt/auth.conf") < 0)
goto cleanup;
VIR_DEBUG("Checking for readability of '%s'", *path);
if (access(*path, R_OK) == 0)
goto done;
VIR_FREE(*path);
done:
ret = 0;
VIR_DEBUG("Using auth file '%s'", NULLSTR(*path));
cleanup:
VIR_FREE(userdir);
return ret;
}
int
virAuthGetConfigFilePath(virConnectPtr conn,
char **path)
{
return virAuthGetConfigFilePathURI(conn ? conn->uri : NULL, path);
}
static int
virAuthGetCredential(const char *servicename,
const char *hostname,
const char *credname,
const char *path,
char **value)
{
int ret = -1;
virAuthConfigPtr config = NULL;
const char *tmp;
*value = NULL;
if (path == NULL)
return 0;
if (!(config = virAuthConfigNew(path)))
goto cleanup;
if (virAuthConfigLookup(config,
servicename,
hostname,
credname,
&tmp) < 0)
goto cleanup;
if (VIR_STRDUP(*value, tmp) < 0)
goto cleanup;
ret = 0;
cleanup:
virAuthConfigFree(config);
return ret;
}
char *
virAuthGetUsernamePath(const char *path,
virConnectAuthPtr auth,
const char *servicename,
const char *defaultUsername,
const char *hostname)
{
unsigned int ncred;
virConnectCredential cred;
char *prompt;
char *ret = NULL;
if (virAuthGetCredential(servicename, hostname, "username", path, &ret) < 0)
return NULL;
if (ret != NULL)
return ret;
memset(&cred, 0, sizeof(virConnectCredential));
if (defaultUsername != NULL) {
if (virAsprintf(&prompt, _("Enter username for %s [%s]"), hostname,
defaultUsername) < 0) {
return NULL;
}
} else {
if (virAsprintf(&prompt, _("Enter username for %s"), hostname) < 0) {
return NULL;
}
}
for (ncred = 0; ncred < auth->ncredtype; ncred++) {
if (auth->credtype[ncred] != VIR_CRED_AUTHNAME) {
continue;
}
cred.type = VIR_CRED_AUTHNAME;
cred.prompt = prompt;
cred.challenge = hostname;
cred.defresult = defaultUsername;
cred.result = NULL;
cred.resultlen = 0;
if ((*(auth->cb))(&cred, 1, auth->cbdata) < 0) {
VIR_FREE(cred.result);
}
break;
}
VIR_FREE(prompt);
return cred.result;
}
char *
virAuthGetUsername(virConnectPtr conn,
virConnectAuthPtr auth,
const char *servicename,
const char *defaultUsername,
const char *hostname)
{
char *ret;
char *path;
if (virAuthGetConfigFilePath(conn, &path) < 0)
return NULL;
ret = virAuthGetUsernamePath(path, auth, servicename,
defaultUsername, hostname);
VIR_FREE(path);
return ret;
}
char *
virAuthGetPasswordPath(const char *path,
virConnectAuthPtr auth,
const char *servicename,
const char *username,
const char *hostname)
{
unsigned int ncred;
virConnectCredential cred;
char *prompt;
char *ret = NULL;
if (virAuthGetCredential(servicename, hostname, "password", path, &ret) < 0)
return NULL;
if (ret != NULL)
return ret;
memset(&cred, 0, sizeof(virConnectCredential));
if (virAsprintf(&prompt, _("Enter %s's password for %s"), username,
hostname) < 0) {
return NULL;
}
for (ncred = 0; ncred < auth->ncredtype; ncred++) {
if (auth->credtype[ncred] != VIR_CRED_PASSPHRASE &&
auth->credtype[ncred] != VIR_CRED_NOECHOPROMPT) {
continue;
}
cred.type = auth->credtype[ncred];
cred.prompt = prompt;
cred.challenge = hostname;
cred.defresult = NULL;
cred.result = NULL;
cred.resultlen = 0;
if ((*(auth->cb))(&cred, 1, auth->cbdata) < 0) {
VIR_FREE(cred.result);
}
break;
}
VIR_FREE(prompt);
return cred.result;
}
char *
virAuthGetPassword(virConnectPtr conn,
virConnectAuthPtr auth,
const char *servicename,
const char *username,
const char *hostname)
{
char *ret;
char *path;
if (virAuthGetConfigFilePath(conn, &path) < 0)
return NULL;
ret = virAuthGetPasswordPath(path, auth, servicename, username, hostname);
VIR_FREE(path);
return ret;
}