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multiuser.cpp
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multiuser.cpp
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#include "XrdAcc/XrdAccAuthorize.hh"
#include "XrdOuc/XrdOucEnv.hh"
#include "XrdOuc/XrdOucPinPath.hh"
#include "XrdOuc/XrdOucStream.hh"
#include "XrdSec/XrdSecEntity.hh"
#include "XrdSec/XrdSecEntityAttr.hh"
#include "XrdSfs/XrdSfsInterface.hh"
#include "XrdVersion.hh"
#include "XrdOss/XrdOss.hh"
#include "XrdCks/XrdCksWrapper.hh"
#include "XrdChecksum.hh"
#include "MultiuserFileSystem.hh"
#include "MultiuserFile.hh"
#include "UserSentry.hh"
#include <exception>
#include <memory>
#include <mutex>
#include <vector>
#include <sstream>
#include <iomanip>
MultiuserFileSystem* g_multisuer_oss = nullptr;
ChecksumManager* g_checksum_manager = nullptr;
bool UserSentry::m_is_cmsd = false;
XrdVERSIONINFO(XrdOssGetFileSystem, Multiuser);
// The status-quo to retrieve the default object is to copy/paste the
// linker definition and invoke directly.
extern XrdAccAuthorize *XrdAccDefaultAuthorizeObject(XrdSysLogger *lp,
const char *cfn,
const char *parm,
XrdVersionInfo &myVer);
bool UserSentry::ConfigCaps(XrdSysError &log, XrdOucEnv *envP) {
char *argv0 = nullptr, *myProg = nullptr;
XrdOucEnv *xrdEnvP = envP ? static_cast<XrdOucEnv *>(envP->GetPtr("xrdEnv*")) : nullptr;
if (xrdEnvP && (argv0 = static_cast<char *>(xrdEnvP->GetPtr("argv[0]")))) {
auto retc = strlen(argv0);
while(retc--) if (argv0[retc] == '/') break;
myProg = &argv0[retc+1];
}
m_is_cmsd = myProg && !strcmp(myProg, "cmsd");
// See if we have the appropriate capabilities to run this plugin.
cap_t caps = cap_get_proc();
if (caps == NULL) {
log.Emsg("Initialize", "Failed to query daemon thread's capabilities", strerror(errno));
return false;
}
cap_value_t cap_list[2];
int caps_to_set = 0;
cap_flag_value_t test_flag = CAP_CLEAR;
// We must be at least permitted to acquire the needed capabilities.
cap_get_flag(caps, CAP_SETUID, CAP_PERMITTED, &test_flag);
if (test_flag == CAP_CLEAR) {
log.Emsg("check_caps", "CAP_SETUID not in daemon's permitted set");
cap_free(caps);
return false;
}
cap_get_flag(caps, CAP_SETGID, CAP_PERMITTED, &test_flag);
if (test_flag == CAP_CLEAR) {
log.Emsg("check_caps", "CAP_SETGID not in daemon's permitted set");
cap_free(caps);
return false;
}
// Determine which new capabilities are needed to be added to the effective set.
cap_get_flag(caps, CAP_SETUID, CAP_EFFECTIVE, &test_flag);
if (test_flag == CAP_CLEAR) {
//log.Emsg("Initialize", "Will request effective capability for CAP_SETUID");
cap_list[caps_to_set] = CAP_SETUID;
caps_to_set++;
}
cap_get_flag(caps, CAP_SETGID, CAP_EFFECTIVE, &test_flag);
if (test_flag == CAP_CLEAR) {
//log.Emsg("Initialize", "Will request effective capability for CAP_SETGID");
cap_list[caps_to_set] = CAP_SETGID;
caps_to_set++;
}
if (caps_to_set && cap_set_flag(caps, CAP_EFFECTIVE, caps_to_set, cap_list, CAP_SET) == -1) {
log.Emsg("Initialize", "Failed to add capabilities to the requested list.");
cap_free(caps);
return false;
}
if (caps_to_set && (cap_set_proc(caps) == -1)) {
log.Emsg("Initialize", "Failed to acquire necessary capabilities for thread");
cap_free(caps);
return false;
}
cap_free(caps);
return true;
};
class ErrorSentry
{
public:
ErrorSentry(XrdOucErrInfo &dst_err, XrdOucErrInfo &src_err, bool forOpen = false)
: m_dst_err(dst_err), m_src_err(src_err)
{
unsigned long long cbArg;
XrdOucEICB *cbVal = dst_err.getErrCB(cbArg);
if (forOpen)
{
src_err.setUCap(dst_err.getUCap());
}
src_err.setErrCB(cbVal, cbArg);
}
~ErrorSentry()
{
if (m_src_err.getErrInfo())
{
m_dst_err = m_src_err;
}
else
{
m_dst_err.Reset();
}
}
private:
XrdOucErrInfo &m_dst_err;
XrdOucErrInfo &m_src_err;
};
MultiuserFile::MultiuserFile(const char *user, std::unique_ptr<XrdOssDF> ossDF, XrdSysError &log, mode_t umask_mode, bool checksum_on_write, unsigned digests, MultiuserFileSystem *oss) :
XrdOssDF(user),
m_wrapped(std::move(ossDF)),
m_log(log),
m_umask_mode(umask_mode),
m_state(NULL),
m_nextoff(0),
m_oss(oss),
m_checksum_on_write(checksum_on_write),
m_digests(digests)
{}
int MultiuserFile::Open(const char *path, int Oflag, mode_t Mode, XrdOucEnv &env)
{
if (((Mode & 0777) == (S_IRUSR | S_IWUSR)) && (m_umask_mode != static_cast<mode_t>(-1)))
{
Mode |= 0777;
}
m_fname = path;
m_client = env.secEnv();
UserSentry sentry(m_client, m_log);
if (!sentry.IsValid()) return -EACCES;
auto open_result = m_wrapped->Open(path, Oflag, Mode, env);
if ((Oflag & (O_WRONLY | O_RDWR)) && m_checksum_on_write)
{
m_state = new ChecksumState(m_digests);
m_log.Emsg("Open", "Will create checksums");
} else {
m_log.Emsg("Open", "Will not create checksum");
}
return open_result;
}
ssize_t MultiuserFile::Write(const void *buffer, off_t offset, size_t size)
{
if ((offset != m_nextoff) && m_state)
{
std::stringstream ss;
ss << "Out-of-order writes not supported while running checksum. " << m_fname;
m_log.Emsg("Write", ss.str().c_str());
return -ENOTSUP;
}
auto result = m_wrapped->Write(buffer, offset, size);
if (result >= 0) {m_nextoff += result;}
if (m_state)
{
m_state->Update(static_cast<const unsigned char*>(buffer), size);
}
return result;
}
int MultiuserFile::Close(long long *retsz)
{
auto close_result = m_wrapped->Close(retsz);
if (m_state)
{
m_state->Finalize();
if (close_result == XrdOssOK) {
// Only write checksum file if close() was successful
{
UserSentry sentry(m_client, m_log);
if (sentry.IsValid()) {
g_checksum_manager->Set(m_fname.c_str(), *m_state);
}
}
}
delete m_state;
m_state = NULL;
}
return close_result;
}
/*
Multiuser compatible checksum wrapper. Only available in XRootD 5.2+
*/
class MultiuserChecksum : public XrdCksWrapper
{
public:
MultiuserChecksum(XrdCks &prevPI, XrdSysError *errP) :
XrdCksWrapper(prevPI, errP),
m_log(errP)
{
}
virtual ~MultiuserChecksum() {}
/*
Generate the UserSentry object.
The returned UserSentry is the responsibility of the caller.
*/
UserSentry* GenerateUserSentry(XrdOucEnv* env) {
if (env) {
auto client = env->secEnv();
if (client) {
return new UserSentry(client, *m_log);
} else {
// Look up the username in the env
auto username = env->Get("request.name");
if (username) {
return new UserSentry(username, *m_log);
} else {
// Anonymous requests will not have a request.name
return new UserSentry("", *m_log);
}
}
}
return nullptr;
}
virtual
int Calc( const char *Xfn, XrdCksData &Cks, int doSet=1)
{
std::unique_ptr<UserSentry> sentryPtr(GenerateUserSentry(Cks.envP));
if (!sentryPtr->IsValid()) return -EACCES;
return cksPI.Calc(Xfn, Cks, doSet);
}
virtual
int Calc( const char *Xfn, XrdCksData &Cks, XrdCksPCB *pcbP, int doSet=1)
{
(void)pcbP;
return Calc(Xfn, Cks, doSet);
}
virtual
int Del( const char *Xfn, XrdCksData &Cks)
{
std::unique_ptr<UserSentry> sentryPtr(GenerateUserSentry(Cks.envP));
if (!sentryPtr->IsValid()) return -EACCES;
return cksPI.Del(Xfn, Cks);
}
virtual
int Get( const char *Xfn, XrdCksData &Cks)
{
std::unique_ptr<UserSentry> sentryPtr(GenerateUserSentry(Cks.envP));
if (!sentryPtr->IsValid()) return -EACCES;
return cksPI.Get(Xfn, Cks);
}
virtual
int Set( const char *Xfn, XrdCksData &Cks, int myTime=0)
{
std::unique_ptr<UserSentry> sentryPtr(GenerateUserSentry(Cks.envP));
if (!sentryPtr->IsValid()) return -EACCES;
return cksPI.Set(Xfn, Cks, myTime);
}
virtual
int Ver( const char *Xfn, XrdCksData &Cks)
{
std::unique_ptr<UserSentry> sentryPtr(GenerateUserSentry(Cks.envP));
if (!sentryPtr->IsValid()) return -EACCES;
return cksPI.Ver(Xfn, Cks);
}
virtual
int Ver( const char *Xfn, XrdCksData &Cks, XrdCksPCB *pcbP)
{
(void)pcbP;
return Ver(Xfn, Cks);
}
virtual
char *List(const char *Xfn, char *Buff, int Blen, char Sep=' ')
{
//std::unique_ptr<UserSentry> sentryPtr(GenerateUserSentry(Cks.envP));
return cksPI.List(Xfn, Buff, Blen, Sep);
}
private:
XrdSysError *m_log;
};
extern "C" {
/*
This function is called when we are wrapping something. curr_oss is already initialized
*/
XrdOss *XrdOssAddStorageSystem2(XrdOss *curr_oss,
XrdSysLogger *Logger,
const char *config_fn,
const char *parms,
XrdOucEnv *envP)
{
XrdSysError log(Logger, "multiuser_");
if (!UserSentry::ConfigCaps(log, envP)) {
return nullptr;
}
envP->Export("XRDXROOTD_NOPOSC", "1");
try {
g_multisuer_oss = new MultiuserFileSystem(curr_oss, Logger, config_fn, envP);
return g_multisuer_oss;
} catch (std::runtime_error &re) {
log.Emsg("Initialize", "Encountered a runtime failure:", re.what());
return nullptr;
}
}
/*
This function is called when it is the top level file system and we are not
wrapping anything
*/
XrdOss *XrdOssGetStorageSystem2(XrdOss *native_oss,
XrdSysLogger *Logger,
const char *config_fn,
const char *parms,
XrdOucEnv *envP)
{
XrdSysError log(Logger, "multiuser_");
if (native_oss->Init(Logger, config_fn, envP) != 0) {
log.Emsg("Initialize", "Multiuser failed to initialize the native.");
return nullptr;
}
return XrdOssAddStorageSystem2(native_oss, Logger, config_fn, parms, envP);
}
XrdOss *XrdOssGetStorageSystem(XrdOss *native_oss,
XrdSysLogger *Logger,
const char *config_fn,
const char *parms)
{
XrdSysError log(Logger, "multiuser_");
if (native_oss->Init(Logger, config_fn) != 0) {
log.Emsg("Initialize", "Multiuser failed to initialize the native.");
return nullptr;
}
return XrdOssAddStorageSystem2(native_oss, Logger, config_fn, parms, nullptr);
}
XrdCks *XrdCksAdd2(XrdCks &pPI,
XrdSysError *eDest,
const char *cFN,
const char *Parm,
XrdOucEnv *envP)
{
//XrdSysError log(eDest, "multiuser_checksum_");
if (!UserSentry::ConfigCaps(*eDest, envP)) {
return nullptr;
}
try {
return new MultiuserChecksum(pPI, eDest);
} catch (std::runtime_error &re) {
eDest->Emsg("Initialize", "Encountered a runtime failure:", re.what());
return nullptr;
}
}
XrdCks *XrdCksInit(XrdSysError *eDest,
const char *cFN,
const char *Parms
)
{
// ChecksumManager(XrdSysError *erP, int iosz,
// XrdVersionInfo &vInfo, bool autoload=false):
XrdVERSIONINFODEF(vInfo, ChecksumManager, XrdVNUMBER, XrdVERSION);
ChecksumManager *manager = new ChecksumManager(eDest, 65000, vInfo);
g_checksum_manager = manager;
return XrdCksAdd2(*manager, eDest, cFN, Parms, nullptr);
}
}
XrdVERSIONINFO(XrdOssGetStorageSystem,osg-multiuser);
XrdVERSIONINFO(XrdOssGetStorageSystem2,osg-multiuser);
XrdVERSIONINFO(XrdOssAddStorageSystem2,osg-multiuser);
XrdVERSIONINFO(XrdCksAdd2,osg-multiuser);
XrdVERSIONINFO(XrdCksInit,osg-multiuser);