Viewing file:  UserDatabase.cpp (5.99 KB) -rw-r--r--
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/*
* Phusion Passenger - https://www.phusionpassenger.com/
* Copyright (c) 2018 Phusion Holding B.V.
*
* "Passenger", "Phusion Passenger" and "Union Station" are registered
* trademarks of Phusion Holding B.V.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <unistd.h>
#include <algorithm>
#include <cstdio>
#include <cstddef>
#include <cstring>
#include <cerrno>
#include <oxt/backtrace.hpp>
#include <Exceptions.h>
#include <SystemTools/UserDatabase.h>
namespace Passenger {
using namespace std;
OsUserOrGroup::OsUserOrGroup()
// _SC_GETPW_R_SIZE_MAX is not a maximum:
// http://tomlee.co/2012/10/problems-with-large-linux-unix-groups-and-getgrgid_r-getgrnam_r/
: buffer(std::max<long>(1024 * 128, sysconf(_SC_GETPW_R_SIZE_MAX)))
{
// Do nothing
}
OsUserOrGroup::~OsUserOrGroup() {
// Do nothing
}
bool
lookupSystemUserByName(const StaticString &name, OsUser &result) {
TRACE_POINT();
// Null terminate name
DynamicBuffer ntName(name.size() + 1);
memcpy(ntName.data, name.data(), name.size());
ntName.data[name.size()] = '\0';
int code;
struct passwd *output = NULL;
do {
code = getpwnam_r(ntName.data, &result.pwd, result.buffer.data,
result.buffer.size, &output);
} while (code == EINTR || code == EAGAIN);
if (code == 0) {
return output != NULL;
} else {
throw SystemException("Error looking up OS user account " + name, code);
}
}
bool
lookupSystemUserByUid(uid_t uid, OsUser &result) {
TRACE_POINT();
int code;
struct passwd *output = NULL;
do {
code = getpwuid_r(uid, &result.pwd, result.buffer.data,
result.buffer.size, &output);
} while (code == EINTR || code == EAGAIN);
if (code == 0) {
return output != NULL;
} else {
throw SystemException("Error looking up OS user account " + toString(uid), code);
}
}
bool
lookupSystemGroupByName(const StaticString &name, OsGroup &result) {
TRACE_POINT();
// Null terminate name
DynamicBuffer ntName(name.size() + 1);
memcpy(ntName.data, name.data(), name.size());
ntName.data[name.size()] = '\0';
int code;
struct group *output = NULL;
do {
code = getgrnam_r(ntName.data, &result.grp, result.buffer.data,
result.buffer.size, &output);
} while (code == EINTR || code == EAGAIN);
if (code == 0) {
return output != NULL;
} else {
throw SystemException("Error looking up OS group account " + name, code);
}
}
bool
lookupSystemGroupByGid(gid_t gid, OsGroup &result) {
TRACE_POINT();
int code;
struct group *output = NULL;
do {
code = getgrgid_r(gid, &result.grp, result.buffer.data,
result.buffer.size, &output);
} while (code == EINTR || code == EAGAIN);
if (code == 0) {
return output != NULL;
} else {
throw SystemException("Error looking up OS group account " + toString(gid), code);
}
}
string
lookupSystemUsernameByUid(uid_t uid, const StaticString &fallbackFormat) {
OsUser user;
bool result;
try {
result = lookupSystemUserByUid(uid, user);
} catch (const SystemException &) {
result = false;
}
if (result && user.pwd.pw_name != NULL && user.pwd.pw_name[0] != '\0') {
return user.pwd.pw_name;
} else {
// Null terminate fallback format string
DynamicBuffer fallbackFormatNt(fallbackFormat.size() + 1);
memcpy(fallbackFormatNt.data, fallbackFormat.data(), fallbackFormat.size());
fallbackFormatNt.data[fallbackFormat.size()] = '\0';
char buf[512];
snprintf(buf, sizeof(buf), fallbackFormatNt.data, (int) uid);
buf[sizeof(buf) - 1] = '\0';
return buf;
}
}
string
lookupSystemGroupnameByGid(gid_t gid, const StaticString &fallbackFormat) {
OsGroup group;
bool result;
try {
result = lookupSystemGroupByGid(gid, group);
} catch (const SystemException &) {
result = false;
}
if (result && group.grp.gr_name != NULL && group.grp.gr_name[0] != '\0') {
return group.grp.gr_name;
} else {
// Null terminate fallback format string
DynamicBuffer fallbackFormatNt(fallbackFormat.size() + 1);
memcpy(fallbackFormatNt.data, fallbackFormat.data(), fallbackFormat.size());
fallbackFormatNt.data[fallbackFormat.size()] = '\0';
char buf[512];
snprintf(buf, sizeof(buf), fallbackFormatNt.data, (int) gid);
buf[sizeof(buf) - 1] = '\0';
return buf;
}
}
string
getHomeDir() {
TRACE_POINT();
const char *env = getenv("HOME");
if (env != NULL && *env != '\0') {
return env;
}
OsUser user;
bool result;
uid_t uid = getuid();
try {
result = lookupSystemUserByUid(uid, user);
} catch (const SystemException &e) {
throw SystemException("Cannot determine the home directory for user "
+ lookupSystemUsernameByUid(uid) + ": error looking up OS user account",
e.code());
}
if (result) {
if (user.pwd.pw_dir == NULL || user.pwd.pw_dir[0] == '\0') {
throw RuntimeException("Cannot determine the home directory for user "
+ lookupSystemUsernameByUid(uid) + ": OS user account has no home directory defined");
} else {
return user.pwd.pw_dir;
}
} else {
throw RuntimeException("Cannot determine the home directory for user "
+ lookupSystemUsernameByUid(uid) + ": OS user account does not exist");
}
}
} // namespace Passenger
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