lib/sysacls.c

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/* 
   Unix SMB/CIFS implementation.
   Samba system utilities for ACL support.
   Copyright (C) Jeremy Allison 2000.
   Copyright (C) Volker Lendecke 2006
   Copyright (C) Michael Adam 2006
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program 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 General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"

#undef  DBGC_CLASS
#define DBGC_CLASS DBGC_ACLS

/*
 * Note that while this code implements sufficient functionality
 * to support the sys_acl_* interfaces it does not provide all
 * of the semantics of the POSIX ACL interfaces.
 *
 * In particular, an ACL entry descriptor (SMB_ACL_ENTRY_T) returned
 * from a call to sys_acl_get_entry() should not be assumed to be
 * valid after calling any of the following functions, which may
 * reorder the entries in the ACL.
 *
 *      sys_acl_valid()
 *      sys_acl_set_file()
 *      sys_acl_set_fd()
 */

int sys_acl_get_entry(SMB_ACL_T acl_d, int entry_id, SMB_ACL_ENTRY_T *entry_p)
{
        if (entry_id != SMB_ACL_FIRST_ENTRY && entry_id != SMB_ACL_NEXT_ENTRY) {
                errno = EINVAL;
                return -1;
        }

        if (entry_p == NULL) {
                errno = EINVAL;
                return -1;
        }

        if (entry_id == SMB_ACL_FIRST_ENTRY) {
                acl_d->next = 0;
        }

        if (acl_d->next < 0) {
                errno = EINVAL;
                return -1;
        }

        if (acl_d->next >= acl_d->count) {
                return 0;
        }

        *entry_p = &acl_d->acl[acl_d->next++];

        return 1;
}

int sys_acl_get_tag_type(SMB_ACL_ENTRY_T entry_d, SMB_ACL_TAG_T *type_p)
{
        *type_p = entry_d->a_type;

        return 0;
}

int sys_acl_get_permset(SMB_ACL_ENTRY_T entry_d, SMB_ACL_PERMSET_T *permset_p)
{
        *permset_p = &entry_d->a_perm;

        return 0;
}

void *sys_acl_get_qualifier(SMB_ACL_ENTRY_T entry_d)
{
        if (entry_d->a_type == SMB_ACL_USER) {
                return &entry_d->uid;
                }

        if (entry_d->a_type == SMB_ACL_GROUP) {
                return &entry_d->gid;
        }

        errno = EINVAL;
                return NULL;
}

int sys_acl_clear_perms(SMB_ACL_PERMSET_T permset_d)
{
        *permset_d = 0;

        return 0;
}

int sys_acl_add_perm(SMB_ACL_PERMSET_T permset_d, SMB_ACL_PERM_T perm)
{
        if (perm != SMB_ACL_READ && perm != SMB_ACL_WRITE
            && perm != SMB_ACL_EXECUTE) {
                errno = EINVAL;
                return -1;
                }
 
        if (permset_d == NULL) {
                errno = EINVAL;
                return -1;
        }

        *permset_d |= perm;
 
        return 0;
}

int sys_acl_get_perm(SMB_ACL_PERMSET_T permset_d, SMB_ACL_PERM_T perm)
{
        return *permset_d & perm;
}

char *sys_acl_to_text(SMB_ACL_T acl_d, ssize_t *len_p)
{
        int     i;
        int     len, maxlen;
        char    *text;

        /*
         * use an initial estimate of 20 bytes per ACL entry
         * when allocating memory for the text representation
         * of the ACL
         */
        len     = 0;
        maxlen  = 20 * acl_d->count;
        if ((text = (char *)SMB_MALLOC(maxlen)) == NULL) {
                errno = ENOMEM;
                return NULL;
        }

        for (i = 0; i < acl_d->count; i++) {
                struct smb_acl_entry *ap = &acl_d->acl[i];
                struct group    *gr;
                char            tagbuf[12];
                char            idbuf[12];
                const char      *tag;
                const char      *id     = "";
                char            perms[4];
                int             nbytes;

                switch (ap->a_type) {
                        /*
                         * for debugging purposes it's probably more
                         * useful to dump unknown tag types rather
                         * than just returning an error
                         */
                        default:
                                slprintf(tagbuf, sizeof(tagbuf)-1, "0x%x",
                                         ap->a_type);
                                tag = tagbuf;
                                break;
 
                        case SMB_ACL_USER:
                                id = uidtoname(ap->uid);
                        case SMB_ACL_USER_OBJ:
                                tag = "user";
                                break;

                        case SMB_ACL_GROUP:
                                if ((gr = getgrgid(ap->gid)) == NULL) {
                                        slprintf(idbuf, sizeof(idbuf)-1, "%ld",
                                                (long)ap->gid);
                                        id = idbuf;
                                } else {
                                        id = gr->gr_name;
                                }
                        case SMB_ACL_GROUP_OBJ:
                                tag = "group";
                                break;

                        case SMB_ACL_OTHER:
                                tag = "other";
                                break;

                        case SMB_ACL_MASK:
                                tag = "mask";
                                break;

                }

                perms[0] = (ap->a_perm & SMB_ACL_READ) ? 'r' : '-';
                perms[1] = (ap->a_perm & SMB_ACL_WRITE) ? 'w' : '-';
                perms[2] = (ap->a_perm & SMB_ACL_EXECUTE) ? 'x' : '-';
                perms[3] = '\0';

                /*          <tag>      :  <qualifier>   :  rwx \n  \0 */
                nbytes = strlen(tag) + 1 + strlen(id) + 1 + 3 + 1 + 1;

                /*
                 * If this entry would overflow the buffer
                 * allocate enough additional memory for this
                 * entry and an estimate of another 20 bytes
                 * for each entry still to be processed
                 */
                if ((len + nbytes) > maxlen) {
                        maxlen += nbytes + 20 * (acl_d->count - i);
                        if ((text = (char *)SMB_REALLOC(text, maxlen)) == NULL) {
                        errno = ENOMEM;
                                return NULL;
                }
        }

                slprintf(&text[len], nbytes-1, "%s:%s:%s\n", tag, id, perms);
                len += nbytes - 1;
        }

        if (len_p)
                *len_p = len;

        return text;
}

SMB_ACL_T sys_acl_init(int count)
{
        SMB_ACL_T       a;

        if (count < 0) {
                errno = EINVAL;
                return NULL;
        }

        /*
         * note that since the definition of the structure pointed
         * to by the SMB_ACL_T includes the first element of the
         * acl[] array, this actually allocates an ACL with room
         * for (count+1) entries
         */
        if ((a = (struct smb_acl_t *)SMB_MALLOC(
                     sizeof(struct smb_acl_t) +
                     count * sizeof(struct smb_acl_entry))) == NULL) {
                errno = ENOMEM;
                return NULL;
        }
 
        a->size = count + 1;
        a->count = 0;
        a->next = -1;

        return a;
}

int sys_acl_create_entry(SMB_ACL_T *acl_p, SMB_ACL_ENTRY_T *entry_p)
{
        SMB_ACL_T       acl_d;
        SMB_ACL_ENTRY_T entry_d;

        if (acl_p == NULL || entry_p == NULL || (acl_d = *acl_p) == NULL) {
                errno = EINVAL;
                return -1;
        }

        if (acl_d->count >= acl_d->size) {
                errno = ENOSPC;
                return -1;
        }

        entry_d         = &acl_d->acl[acl_d->count++];
        entry_d->a_type = SMB_ACL_TAG_INVALID;
        entry_d->uid    = -1;
        entry_d->gid    = -1;
        entry_d->a_perm = 0;
        *entry_p        = entry_d;

        return 0;
}

int sys_acl_set_tag_type(SMB_ACL_ENTRY_T entry_d, SMB_ACL_TAG_T tag_type)
{
        switch (tag_type) {
                case SMB_ACL_USER:
                case SMB_ACL_USER_OBJ:
                case SMB_ACL_GROUP:
                case SMB_ACL_GROUP_OBJ:
                case SMB_ACL_OTHER:
                case SMB_ACL_MASK:
                        entry_d->a_type = tag_type;
                        break;
                default:
                        errno = EINVAL;
                        return -1;
                }

        return 0;
}

int sys_acl_set_qualifier(SMB_ACL_ENTRY_T entry_d, void *qual_p)
{
        if (entry_d->a_type == SMB_ACL_USER) {
                entry_d->uid = *((uid_t *)qual_p);
                return 0;
                }
        if (entry_d->a_type == SMB_ACL_GROUP) {
                entry_d->gid = *((gid_t *)qual_p);
                return 0;
        }

        errno = EINVAL;
        return -1;
}

int sys_acl_set_permset(SMB_ACL_ENTRY_T entry_d, SMB_ACL_PERMSET_T permset_d)
{
        if (*permset_d & ~(SMB_ACL_READ|SMB_ACL_WRITE|SMB_ACL_EXECUTE)) {
                errno = EINVAL;
                return -1;
        }

        entry_d->a_perm = *permset_d;
 
        return 0;
}

int sys_acl_free_text(char *text)
{
        SAFE_FREE(text);
        return 0;
}

int sys_acl_free_acl(SMB_ACL_T acl_d) 
{
        SAFE_FREE(acl_d);
        return 0;
}

int sys_acl_free_qualifier(void *qual, SMB_ACL_TAG_T tagtype)
{
        return 0;
}

int sys_acl_valid(SMB_ACL_T acl_d)
{
        errno = EINVAL;
        return -1;
}

/*
 * acl_get_file, acl_get_fd, acl_set_file, acl_set_fd and
 * sys_acl_delete_def_file are to be redirected to the default
 * statically-bound acl vfs module, but they are replacable.
 */
 
#if defined(HAVE_POSIX_ACLS)
 
SMB_ACL_T sys_acl_get_file(vfs_handle_struct *handle, 
                           const char *path_p, SMB_ACL_TYPE_T type)
{
        return posixacl_sys_acl_get_file(handle, path_p, type);
}
 
SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle, files_struct *fsp, int fd)
{
        return posixacl_sys_acl_get_fd(handle, fsp, fd);
}
 
int sys_acl_set_file(vfs_handle_struct *handle,
                     const char *name, SMB_ACL_TYPE_T type, SMB_ACL_T acl_d)
{
        return posixacl_sys_acl_set_file(handle, name, type, acl_d);
}
 
int sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp,
                   int fd, SMB_ACL_T acl_d)
{
        return posixacl_sys_acl_set_fd(handle, fsp, fd, acl_d);
}

int sys_acl_delete_def_file(vfs_handle_struct *handle,
                            const char *path)
{
        return posixacl_sys_acl_delete_def_file(handle, path);
}

#elif defined(HAVE_AIX_ACLS)

SMB_ACL_T sys_acl_get_file(vfs_handle_struct *handle,
                           const char *path_p, SMB_ACL_TYPE_T type)
{
        return aixacl_sys_acl_get_file(handle, path_p, type);
}

SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle, files_struct *fsp, int fd)
{
        return aixacl_sys_acl_get_fd(handle, fsp, fd);
}

int sys_acl_set_file(vfs_handle_struct *handle,
                     const char *name, SMB_ACL_TYPE_T type, SMB_ACL_T acl_d)
{
        return aixacl_sys_acl_set_file(handle, name, type, acl_d);
}

int sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp,
                   int fd, SMB_ACL_T acl_d)
{
        return aixacl_sys_acl_set_fd(handle, fsp, fd, acl_d);
}

int sys_acl_delete_def_file(vfs_handle_struct *handle,
                            const char *path)
{
        return aixacl_sys_acl_delete_def_file(handle, path);
}

#elif defined(HAVE_TRU64_ACLS)
 
SMB_ACL_T sys_acl_get_file(vfs_handle_struct *handle,
                           const char *path_p, SMB_ACL_TYPE_T type)
{
        return tru64acl_sys_acl_get_file(handle, path_p, type);
}

SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle, files_struct *fsp, int fd)
{
        return tru64acl_sys_acl_get_fd(handle, fsp, fd);
}

int sys_acl_set_file(vfs_handle_struct *handle,
                     const char *name, SMB_ACL_TYPE_T type, SMB_ACL_T acl_d)
{
        return tru64acl_sys_acl_set_file(handle, name, type, acl_d);
}

int sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp,
                   int fd, SMB_ACL_T acl_d)
{
        return tru64acl_sys_acl_set_fd(handle, fsp, fd, acl_d);
}

int sys_acl_delete_def_file(vfs_handle_struct *handle,
                            const char *path)
{
        return tru64acl_sys_acl_delete_def_file(handle, path);
}

#elif defined(HAVE_SOLARIS_ACLS) || defined(HAVE_UNIXWARE_ACLS)

SMB_ACL_T sys_acl_get_file(vfs_handle_struct *handle,
                           const char *path_p, SMB_ACL_TYPE_T type)
{
        return solarisacl_sys_acl_get_file(handle, path_p, type);
}

SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle, files_struct *fsp, int fd)
{
        return solarisacl_sys_acl_get_fd(handle, fsp, fd);
}

int sys_acl_set_file(vfs_handle_struct *handle,
                     const char *name, SMB_ACL_TYPE_T type, SMB_ACL_T acl_d)
{
        return solarisacl_sys_acl_set_file(handle, name, type, acl_d);
}

int sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp,
                   int fd, SMB_ACL_T acl_d)
{
        return solarisacl_sys_acl_set_fd(handle, fsp, fd, acl_d);
}

int sys_acl_delete_def_file(vfs_handle_struct *handle,
                            const char *path)
{
        return solarisacl_sys_acl_delete_def_file(handle, path);
}

#elif defined(HAVE_HPUX_ACLS)

SMB_ACL_T sys_acl_get_file(vfs_handle_struct *handle,
                           const char *path_p, SMB_ACL_TYPE_T type)
{
        return hpuxacl_sys_acl_get_file(handle, path_p, type);
}

SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle, files_struct *fsp, int fd)
{
        return hpuxacl_sys_acl_get_fd(handle, fsp, fd);
}

int sys_acl_set_file(vfs_handle_struct *handle,
                     const char *name, SMB_ACL_TYPE_T type, SMB_ACL_T acl_d)
{
        return hpuxacl_sys_acl_set_file(handle, name, type, acl_d);
}

int sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp,
                   int fd, SMB_ACL_T acl_d)
{
        return hpuxacl_sys_acl_set_fd(handle, fsp, fd, acl_d);
}

int sys_acl_delete_def_file(vfs_handle_struct *handle,
                            const char *path)
{
        return hpuxacl_sys_acl_delete_def_file(handle, path);
}

#elif defined(HAVE_IRIX_ACLS)

SMB_ACL_T sys_acl_get_file(vfs_handle_struct *handle,
                           const char *path_p, SMB_ACL_TYPE_T type)
{
        return irixacl_sys_acl_get_file(handle, path_p, type);
}

SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle, files_struct *fsp, int fd)
{
        return irixacl_sys_acl_get_fd(handle, fsp, fd);
}

int sys_acl_set_file(vfs_handle_struct *handle,
                     const char *name, SMB_ACL_TYPE_T type, SMB_ACL_T acl_d)
{
        return irixacl_sys_acl_set_file(handle, name, type, acl_d);
}

int sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp,
                   int fd, SMB_ACL_T acl_d)
{
        return irixacl_sys_acl_set_fd(handle, fsp, fd, acl_d);
}

int sys_acl_delete_def_file(vfs_handle_struct *handle,
                            const char *path)
{
        return irixacl_sys_acl_delete_def_file(handle, path);
}

#else /* No ACLs. */

SMB_ACL_T sys_acl_get_file(vfs_handle_struct *handle,
                           const char *path_p, SMB_ACL_TYPE_T type)
{
#ifdef ENOTSUP
        errno = ENOTSUP;
#else
        errno = ENOSYS;
#endif
        return NULL;
}

SMB_ACL_T sys_acl_get_fd(vfs_handle_struct *handle, files_struct *fsp, int fd)
{
#ifdef ENOTSUP
        errno = ENOTSUP;
#else
        errno = ENOSYS;
#endif
        return NULL;
}

int sys_acl_set_file(vfs_handle_struct *handle,
                     const char *name, SMB_ACL_TYPE_T type, SMB_ACL_T acl_d)
{
#ifdef ENOTSUP
        errno = ENOTSUP;
#else
        errno = ENOSYS;
#endif
        return -1;
}

int sys_acl_set_fd(vfs_handle_struct *handle, files_struct *fsp,
                   int fd, SMB_ACL_T acl_d)
{
#ifdef ENOTSUP
        errno = ENOTSUP;
#else
        errno = ENOSYS;
#endif
        return -1;
}

int sys_acl_delete_def_file(vfs_handle_struct *handle,
                            const char *path)
{
#ifdef ENOTSUP
        errno = ENOTSUP;
#else
        errno = ENOSYS;
#endif
        return -1;
}

#endif

/************************************************************************
 Deliberately outside the ACL defines. Return 1 if this is a "no acls"
 errno, 0 if not.
************************************************************************/

int no_acl_syscall_error(int err)
{
#if defined(ENOSYS)
        if (err == ENOSYS) {
                return 1;
        }
#endif
#if defined(ENOTSUP)
        if (err == ENOTSUP) {
                return 1;
        }
#endif
        return 0;
}

---