Module: Process::GID

Defined in:
process.c

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.Process::GID.change_privilege(group) ⇒ Integer

Change the current process’s real and effective group ID to that specified by group. Returns the new group ID. Not available on all platforms.

[Process.gid, Process.egid]          #=> [0, 0]
Process::GID.change_privilege(33)    #=> 33
[Process.gid, Process.egid]          #=> [33, 33]

Returns:



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# File 'process.c', line 7146

static VALUE
p_gid_change_privilege(VALUE obj, VALUE id)
{
    rb_gid_t gid;

    check_gid_switch();

    gid = OBJ2GID(id);

    if (geteuid() == 0) { /* root-user */
#if defined(HAVE_SETRESGID)
        if (setresgid(gid, gid, gid) < 0) rb_sys_fail(0);
        SAVED_GROUP_ID = gid;
#elif defined HAVE_SETGID
        if (setgid(gid) < 0) rb_sys_fail(0);
        SAVED_GROUP_ID = gid;
#elif defined(HAVE_SETREGID) && !defined(OBSOLETE_SETREGID)
        if (getgid() == gid) {
            if (SAVED_GROUP_ID == gid) {
                if (setregid(-1, gid) < 0) rb_sys_fail(0);
            }
            else {
                if (gid == 0) { /* (r,e,s) == (root, y, x) */
                    if (setregid(-1, SAVED_GROUP_ID) < 0) rb_sys_fail(0);
                    if (setregid(SAVED_GROUP_ID, 0) < 0) rb_sys_fail(0);
                    SAVED_GROUP_ID = 0; /* (r,e,s) == (x, root, root) */
                    if (setregid(gid, gid) < 0) rb_sys_fail(0);
                    SAVED_GROUP_ID = gid;
                }
                else { /* (r,e,s) == (z, y, x) */
                    if (setregid(0, 0) < 0) rb_sys_fail(0);
                    SAVED_GROUP_ID = 0;
                    if (setregid(gid, gid) < 0) rb_sys_fail(0);
                    SAVED_GROUP_ID = gid;
                }
            }
        }
        else {
            if (setregid(gid, gid) < 0) rb_sys_fail(0);
            SAVED_GROUP_ID = gid;
        }
#elif defined(HAVE_SETRGID) && defined (HAVE_SETEGID)
        if (getgid() == gid) {
            if (SAVED_GROUP_ID == gid) {
                if (setegid(gid) < 0) rb_sys_fail(0);
            }
            else {
                if (gid == 0) {
                    if (setegid(gid) < 0) rb_sys_fail(0);
                    if (setrgid(SAVED_GROUP_ID) < 0) rb_sys_fail(0);
                    SAVED_GROUP_ID = 0;
                    if (setrgid(0) < 0) rb_sys_fail(0);
                }
                else {
                    if (setrgid(0) < 0) rb_sys_fail(0);
                    SAVED_GROUP_ID = 0;
                    if (setegid(gid) < 0) rb_sys_fail(0);
                    if (setrgid(gid) < 0) rb_sys_fail(0);
                    SAVED_GROUP_ID = gid;
                }
            }
        }
        else {
            if (setegid(gid) < 0) rb_sys_fail(0);
            if (setrgid(gid) < 0) rb_sys_fail(0);
            SAVED_GROUP_ID = gid;
        }
#else
        rb_notimplement();
#endif
    }
    else { /* unprivileged user */
#if defined(HAVE_SETRESGID)
        if (setresgid((getgid() == gid)? (rb_gid_t)-1: gid,
                      (getegid() == gid)? (rb_gid_t)-1: gid,
                      (SAVED_GROUP_ID == gid)? (rb_gid_t)-1: gid) < 0) rb_sys_fail(0);
        SAVED_GROUP_ID = gid;
#elif defined(HAVE_SETREGID) && !defined(OBSOLETE_SETREGID)
        if (SAVED_GROUP_ID == gid) {
            if (setregid((getgid() == gid)? (rb_uid_t)-1: gid,
                         (getegid() == gid)? (rb_uid_t)-1: gid) < 0)
                rb_sys_fail(0);
        }
        else if (getgid() != gid) {
            if (setregid(gid, (getegid() == gid)? (rb_uid_t)-1: gid) < 0)
                rb_sys_fail(0);
            SAVED_GROUP_ID = gid;
        }
        else if (/* getgid() == gid && */ getegid() != gid) {
            if (setregid(getegid(), gid) < 0) rb_sys_fail(0);
            SAVED_GROUP_ID = gid;
            if (setregid(gid, -1) < 0) rb_sys_fail(0);
        }
        else { /* getgid() == gid && getegid() == gid */
            if (setregid(-1, SAVED_GROUP_ID) < 0) rb_sys_fail(0);
            if (setregid(SAVED_GROUP_ID, gid) < 0) rb_sys_fail(0);
            SAVED_GROUP_ID = gid;
            if (setregid(gid, -1) < 0) rb_sys_fail(0);
        }
#elif defined(HAVE_SETRGID) && defined(HAVE_SETEGID)
        if (SAVED_GROUP_ID == gid) {
            if (getegid() != gid && setegid(gid) < 0) rb_sys_fail(0);
            if (getgid() != gid && setrgid(gid) < 0) rb_sys_fail(0);
        }
        else if (/* SAVED_GROUP_ID != gid && */ getegid() == gid) {
            if (getgid() != gid) {
                if (setrgid(gid) < 0) rb_sys_fail(0);
                SAVED_GROUP_ID = gid;
            }
            else {
                if (setrgid(SAVED_GROUP_ID) < 0) rb_sys_fail(0);
                SAVED_GROUP_ID = gid;
                if (setrgid(gid) < 0) rb_sys_fail(0);
            }
        }
        else if (/* getegid() != gid && */ getgid() == gid) {
            if (setegid(gid) < 0) rb_sys_fail(0);
            if (setrgid(SAVED_GROUP_ID) < 0) rb_sys_fail(0);
            SAVED_GROUP_ID = gid;
            if (setrgid(gid) < 0) rb_sys_fail(0);
        }
        else {
            rb_syserr_fail(EPERM, 0);
        }
#elif defined HAVE_44BSD_SETGID
        if (getgid() == gid) {
            /* (r,e,s)==(gid,?,?) ==> (gid,gid,gid) */
            if (setgid(gid) < 0) rb_sys_fail(0);
            SAVED_GROUP_ID = gid;
        }
        else {
            rb_syserr_fail(EPERM, 0);
        }
#elif defined HAVE_SETEGID
        if (getgid() == gid && SAVED_GROUP_ID == gid) {
            if (setegid(gid) < 0) rb_sys_fail(0);
        }
        else {
            rb_syserr_fail(EPERM, 0);
        }
#elif defined HAVE_SETGID
        if (getgid() == gid && SAVED_GROUP_ID == gid) {
            if (setgid(gid) < 0) rb_sys_fail(0);
        }
        else {
            rb_syserr_fail(EPERM, 0);
        }
#else
        (void)gid;
        rb_notimplement();
#endif
    }
    return id;
}

.egid ⇒ Integer .Process::GID.eid ⇒ Integer .Process::Sys.geteid ⇒ Integer

Returns the effective group ID for the current process:

Process.egid # => 500

Not available on all platforms.

Overloads:



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# File 'process.c', line 7440

static VALUE
proc_getegid(VALUE obj)
{
    rb_gid_t egid = getegid();

    return GIDT2NUM(egid);
}

.Process::GID.from_name(name) ⇒ Object

Get the group ID by the name. If the group is not found, ArgumentError will be raised.

Process::GID.from_name("wheel") #=> 0
Process::GID.from_name("nosuchgroup") #=> can't find group for nosuchgroup (ArgumentError)



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# File 'process.c', line 6196

static VALUE
p_gid_from_name(VALUE self, VALUE id)
{
    return GIDT2NUM(OBJ2GID(id));
}

.Process::GID.grant_privilege(group) ⇒ Integer .Process::GID.eid( = group) ⇒ Integer

Set the effective group ID, and if possible, the saved group ID of the process to the given group. Returns the new effective group ID. Not available on all platforms.

[Process.gid, Process.egid]          #=> [0, 0]
Process::GID.grant_privilege(31)     #=> 33
[Process.gid, Process.egid]          #=> [0, 33]

Overloads:



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# File 'process.c', line 7551

static VALUE
p_gid_grant_privilege(VALUE obj, VALUE id)
{
    rb_setegid_core(OBJ2GID(id));
    return id;
}

.Process::GID.re_exchange ⇒ Integer

Exchange real and effective group IDs and return the new effective group ID. Not available on all platforms.

[Process.gid, Process.egid]   #=> [0, 33]
Process::GID.re_exchange      #=> 0
[Process.gid, Process.egid]   #=> [33, 0]

Returns:



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# File 'process.c', line 7655

static VALUE
p_gid_exchange(VALUE obj)
{
    rb_gid_t gid;
#if defined(HAVE_SETRESGID) || (defined(HAVE_SETREGID) && !defined(OBSOLETE_SETREGID))
    rb_gid_t egid;
#endif

    check_gid_switch();

    gid = getgid();
#if defined(HAVE_SETRESGID) || (defined(HAVE_SETREGID) && !defined(OBSOLETE_SETREGID))
    egid = getegid();
#endif

#if defined(HAVE_SETRESGID)
    if (setresgid(egid, gid, gid) < 0) rb_sys_fail(0);
    SAVED_GROUP_ID = gid;
#elif defined(HAVE_SETREGID) && !defined(OBSOLETE_SETREGID)
    if (setregid(egid,gid) < 0) rb_sys_fail(0);
    SAVED_GROUP_ID = gid;
#else
    rb_notimplement();
#endif
    return GIDT2NUM(gid);
}

.Process::GID.re_exchangeable? ⇒ Boolean

Returns true if the real and effective group IDs of a process may be exchanged on the current platform.

Returns:

  • (Boolean) 


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# File 'process.c', line 7630

static VALUE
p_gid_exchangeable(VALUE _)
{
#if defined(HAVE_SETRESGID)
    return Qtrue;
#elif defined(HAVE_SETREGID) && !defined(OBSOLETE_SETREGID)
    return Qtrue;
#else
    return Qfalse;
#endif
}

.gid ⇒ Integer .Process::GID.rid ⇒ Integer .Process::Sys.getgid ⇒ Integer

Returns the (real) group ID for the current process:

Process.gid # => 1000

Overloads:



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# File 'process.c', line 6743

static VALUE
proc_getgid(VALUE obj)
{
    rb_gid_t gid = getgid();
    return GIDT2NUM(gid);
}

.Process::GID.sid_available? ⇒ Boolean

Returns true if the current platform has saved group ID functionality.

Returns:

  • (Boolean) 


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# File 'process.c', line 7808

static VALUE
p_gid_have_saved_id(VALUE _)
{
#if defined(HAVE_SETRESGID) || defined(HAVE_SETEGID) || defined(_POSIX_SAVED_IDS)
    return Qtrue;
#else
    return Qfalse;
#endif
}

.switch ⇒ Object 



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# File 'process.c', line 7886

static VALUE
p_gid_switch(VALUE obj)
{
    rb_gid_t gid, egid;

    check_gid_switch();

    gid = getgid();
    egid = getegid();

    if (gid == egid) {
        rb_syserr_fail(EPERM, 0);
    }
    p_gid_exchange(obj);
    if (rb_block_given_p()) {
        under_gid_switch = 1;
        return rb_ensure(rb_yield, Qnil, p_gid_sw_ensure, obj);
    }
    else {
        return GIDT2NUM(egid);
    }
}

Instance Method Details

#Process::GID.change_privilege(group) ⇒ Integer (private)

Change the current process’s real and effective group ID to that specified by group. Returns the new group ID. Not available on all platforms.

[Process.gid, Process.egid]          #=> [0, 0]
Process::GID.change_privilege(33)    #=> 33
[Process.gid, Process.egid]          #=> [33, 33]

Returns:



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# File 'process.c', line 7146

static VALUE
p_gid_change_privilege(VALUE obj, VALUE id)
{
    rb_gid_t gid;

    check_gid_switch();

    gid = OBJ2GID(id);

    if (geteuid() == 0) { /* root-user */
#if defined(HAVE_SETRESGID)
        if (setresgid(gid, gid, gid) < 0) rb_sys_fail(0);
        SAVED_GROUP_ID = gid;
#elif defined HAVE_SETGID
        if (setgid(gid) < 0) rb_sys_fail(0);
        SAVED_GROUP_ID = gid;
#elif defined(HAVE_SETREGID) && !defined(OBSOLETE_SETREGID)
        if (getgid() == gid) {
            if (SAVED_GROUP_ID == gid) {
                if (setregid(-1, gid) < 0) rb_sys_fail(0);
            }
            else {
                if (gid == 0) { /* (r,e,s) == (root, y, x) */
                    if (setregid(-1, SAVED_GROUP_ID) < 0) rb_sys_fail(0);
                    if (setregid(SAVED_GROUP_ID, 0) < 0) rb_sys_fail(0);
                    SAVED_GROUP_ID = 0; /* (r,e,s) == (x, root, root) */
                    if (setregid(gid, gid) < 0) rb_sys_fail(0);
                    SAVED_GROUP_ID = gid;
                }
                else { /* (r,e,s) == (z, y, x) */
                    if (setregid(0, 0) < 0) rb_sys_fail(0);
                    SAVED_GROUP_ID = 0;
                    if (setregid(gid, gid) < 0) rb_sys_fail(0);
                    SAVED_GROUP_ID = gid;
                }
            }
        }
        else {
            if (setregid(gid, gid) < 0) rb_sys_fail(0);
            SAVED_GROUP_ID = gid;
        }
#elif defined(HAVE_SETRGID) && defined (HAVE_SETEGID)
        if (getgid() == gid) {
            if (SAVED_GROUP_ID == gid) {
                if (setegid(gid) < 0) rb_sys_fail(0);
            }
            else {
                if (gid == 0) {
                    if (setegid(gid) < 0) rb_sys_fail(0);
                    if (setrgid(SAVED_GROUP_ID) < 0) rb_sys_fail(0);
                    SAVED_GROUP_ID = 0;
                    if (setrgid(0) < 0) rb_sys_fail(0);
                }
                else {
                    if (setrgid(0) < 0) rb_sys_fail(0);
                    SAVED_GROUP_ID = 0;
                    if (setegid(gid) < 0) rb_sys_fail(0);
                    if (setrgid(gid) < 0) rb_sys_fail(0);
                    SAVED_GROUP_ID = gid;
                }
            }
        }
        else {
            if (setegid(gid) < 0) rb_sys_fail(0);
            if (setrgid(gid) < 0) rb_sys_fail(0);
            SAVED_GROUP_ID = gid;
        }
#else
        rb_notimplement();
#endif
    }
    else { /* unprivileged user */
#if defined(HAVE_SETRESGID)
        if (setresgid((getgid() == gid)? (rb_gid_t)-1: gid,
                      (getegid() == gid)? (rb_gid_t)-1: gid,
                      (SAVED_GROUP_ID == gid)? (rb_gid_t)-1: gid) < 0) rb_sys_fail(0);
        SAVED_GROUP_ID = gid;
#elif defined(HAVE_SETREGID) && !defined(OBSOLETE_SETREGID)
        if (SAVED_GROUP_ID == gid) {
            if (setregid((getgid() == gid)? (rb_uid_t)-1: gid,
                         (getegid() == gid)? (rb_uid_t)-1: gid) < 0)
                rb_sys_fail(0);
        }
        else if (getgid() != gid) {
            if (setregid(gid, (getegid() == gid)? (rb_uid_t)-1: gid) < 0)
                rb_sys_fail(0);
            SAVED_GROUP_ID = gid;
        }
        else if (/* getgid() == gid && */ getegid() != gid) {
            if (setregid(getegid(), gid) < 0) rb_sys_fail(0);
            SAVED_GROUP_ID = gid;
            if (setregid(gid, -1) < 0) rb_sys_fail(0);
        }
        else { /* getgid() == gid && getegid() == gid */
            if (setregid(-1, SAVED_GROUP_ID) < 0) rb_sys_fail(0);
            if (setregid(SAVED_GROUP_ID, gid) < 0) rb_sys_fail(0);
            SAVED_GROUP_ID = gid;
            if (setregid(gid, -1) < 0) rb_sys_fail(0);
        }
#elif defined(HAVE_SETRGID) && defined(HAVE_SETEGID)
        if (SAVED_GROUP_ID == gid) {
            if (getegid() != gid && setegid(gid) < 0) rb_sys_fail(0);
            if (getgid() != gid && setrgid(gid) < 0) rb_sys_fail(0);
        }
        else if (/* SAVED_GROUP_ID != gid && */ getegid() == gid) {
            if (getgid() != gid) {
                if (setrgid(gid) < 0) rb_sys_fail(0);
                SAVED_GROUP_ID = gid;
            }
            else {
                if (setrgid(SAVED_GROUP_ID) < 0) rb_sys_fail(0);
                SAVED_GROUP_ID = gid;
                if (setrgid(gid) < 0) rb_sys_fail(0);
            }
        }
        else if (/* getegid() != gid && */ getgid() == gid) {
            if (setegid(gid) < 0) rb_sys_fail(0);
            if (setrgid(SAVED_GROUP_ID) < 0) rb_sys_fail(0);
            SAVED_GROUP_ID = gid;
            if (setrgid(gid) < 0) rb_sys_fail(0);
        }
        else {
            rb_syserr_fail(EPERM, 0);
        }
#elif defined HAVE_44BSD_SETGID
        if (getgid() == gid) {
            /* (r,e,s)==(gid,?,?) ==> (gid,gid,gid) */
            if (setgid(gid) < 0) rb_sys_fail(0);
            SAVED_GROUP_ID = gid;
        }
        else {
            rb_syserr_fail(EPERM, 0);
        }
#elif defined HAVE_SETEGID
        if (getgid() == gid && SAVED_GROUP_ID == gid) {
            if (setegid(gid) < 0) rb_sys_fail(0);
        }
        else {
            rb_syserr_fail(EPERM, 0);
        }
#elif defined HAVE_SETGID
        if (getgid() == gid && SAVED_GROUP_ID == gid) {
            if (setgid(gid) < 0) rb_sys_fail(0);
        }
        else {
            rb_syserr_fail(EPERM, 0);
        }
#else
        (void)gid;
        rb_notimplement();
#endif
    }
    return id;
}

#egid ⇒ Integer (private) #Process::GID.eid ⇒ Integer (private) #Process::Sys.geteid ⇒ Integer (private)

Returns the effective group ID for the current process:

Process.egid # => 500

Not available on all platforms.

Overloads:



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# File 'process.c', line 7440

static VALUE
proc_getegid(VALUE obj)
{
    rb_gid_t egid = getegid();

    return GIDT2NUM(egid);
}

#Process::GID.from_name(name) ⇒ Object (private)

Get the group ID by the name. If the group is not found, ArgumentError will be raised.

Process::GID.from_name("wheel") #=> 0
Process::GID.from_name("nosuchgroup") #=> can't find group for nosuchgroup (ArgumentError)



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# File 'process.c', line 6196

static VALUE
p_gid_from_name(VALUE self, VALUE id)
{
    return GIDT2NUM(OBJ2GID(id));
}

#Process::GID.grant_privilege(group) ⇒ Integer (private) #Process::GID.eid( = group) ⇒ Integer (private)

Set the effective group ID, and if possible, the saved group ID of the process to the given group. Returns the new effective group ID. Not available on all platforms.

[Process.gid, Process.egid]          #=> [0, 0]
Process::GID.grant_privilege(31)     #=> 33
[Process.gid, Process.egid]          #=> [0, 33]

Overloads:



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# File 'process.c', line 7551

static VALUE
p_gid_grant_privilege(VALUE obj, VALUE id)
{
    rb_setegid_core(OBJ2GID(id));
    return id;
}

#Process::GID.re_exchange ⇒ Integer (private)

Exchange real and effective group IDs and return the new effective group ID. Not available on all platforms.

[Process.gid, Process.egid]   #=> [0, 33]
Process::GID.re_exchange      #=> 0
[Process.gid, Process.egid]   #=> [33, 0]

Returns:



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# File 'process.c', line 7655

static VALUE
p_gid_exchange(VALUE obj)
{
    rb_gid_t gid;
#if defined(HAVE_SETRESGID) || (defined(HAVE_SETREGID) && !defined(OBSOLETE_SETREGID))
    rb_gid_t egid;
#endif

    check_gid_switch();

    gid = getgid();
#if defined(HAVE_SETRESGID) || (defined(HAVE_SETREGID) && !defined(OBSOLETE_SETREGID))
    egid = getegid();
#endif

#if defined(HAVE_SETRESGID)
    if (setresgid(egid, gid, gid) < 0) rb_sys_fail(0);
    SAVED_GROUP_ID = gid;
#elif defined(HAVE_SETREGID) && !defined(OBSOLETE_SETREGID)
    if (setregid(egid,gid) < 0) rb_sys_fail(0);
    SAVED_GROUP_ID = gid;
#else
    rb_notimplement();
#endif
    return GIDT2NUM(gid);
}

#Process::GID.re_exchangeable? ⇒ Boolean (private)

Returns true if the real and effective group IDs of a process may be exchanged on the current platform.

Returns:

  • (Boolean) 


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# File 'process.c', line 7630

static VALUE
p_gid_exchangeable(VALUE _)
{
#if defined(HAVE_SETRESGID)
    return Qtrue;
#elif defined(HAVE_SETREGID) && !defined(OBSOLETE_SETREGID)
    return Qtrue;
#else
    return Qfalse;
#endif
}

#gid ⇒ Integer (private) #Process::GID.rid ⇒ Integer (private) #Process::Sys.getgid ⇒ Integer (private)

Returns the (real) group ID for the current process:

Process.gid # => 1000

Overloads:



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# File 'process.c', line 6743

static VALUE
proc_getgid(VALUE obj)
{
    rb_gid_t gid = getgid();
    return GIDT2NUM(gid);
}

#Process::GID.sid_available? ⇒ Boolean (private)

Returns true if the current platform has saved group ID functionality.

Returns:

  • (Boolean) 


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# File 'process.c', line 7808

static VALUE
p_gid_have_saved_id(VALUE _)
{
#if defined(HAVE_SETRESGID) || defined(HAVE_SETEGID) || defined(_POSIX_SAVED_IDS)
    return Qtrue;
#else
    return Qfalse;
#endif
}

#switch ⇒ Object (private) 



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# File 'process.c', line 7886

static VALUE
p_gid_switch(VALUE obj)
{
    rb_gid_t gid, egid;

    check_gid_switch();

    gid = getgid();
    egid = getegid();

    if (gid == egid) {
        rb_syserr_fail(EPERM, 0);
    }
    p_gid_exchange(obj);
    if (rb_block_given_p()) {
        under_gid_switch = 1;
        return rb_ensure(rb_yield, Qnil, p_gid_sw_ensure, obj);
    }
    else {
        return GIDT2NUM(egid);
    }
}