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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 16:14:06 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 16:14:06 +0000 |
commit | eee068778cb28ecf3c14e1bf843a95547d72c42d (patch) | |
tree | 0e07b30ddc5ea579d682d5dbe57998200d1c9ab7 /g13/backend.c | |
parent | Initial commit. (diff) | |
download | gnupg2-eee068778cb28ecf3c14e1bf843a95547d72c42d.tar.xz gnupg2-eee068778cb28ecf3c14e1bf843a95547d72c42d.zip |
Adding upstream version 2.2.40.upstream/2.2.40upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | g13/backend.c | 296 |
1 files changed, 296 insertions, 0 deletions
diff --git a/g13/backend.c b/g13/backend.c new file mode 100644 index 0000000..a0a2675 --- /dev/null +++ b/g13/backend.c @@ -0,0 +1,296 @@ +/* backend.c - Dispatcher to the various backends. + * Copyright (C) 2009 Free Software Foundation, Inc. + * + * This file is part of GnuPG. + * + * GnuPG 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 3 of the License, or + * (at your option) any later version. + * + * GnuPG 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, see <https://www.gnu.org/licenses/>. + */ + +#include <config.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <errno.h> +#include <unistd.h> +#include <sys/stat.h> + +#include "g13.h" +#include "../common/i18n.h" +#include "../common/sysutils.h" +#include "keyblob.h" +#include "backend.h" +#include "be-encfs.h" +#include "be-truecrypt.h" +#include "be-dmcrypt.h" +#include "call-syshelp.h" + +#define no_such_backend(a) _no_such_backend ((a), __func__) +static gpg_error_t +_no_such_backend (int conttype, const char *func) +{ + log_error ("invalid backend %d given in %s - this is most likely a bug\n", + conttype, func); + return gpg_error (GPG_ERR_INTERNAL); +} + + +/* Parse NAME and return the corresponding content type. If the name + is not known, a error message is printed and zero returned. If + NAME is NULL the supported backend types are listed and 0 is + returned. */ +int +be_parse_conttype_name (const char *name) +{ + static struct { const char *name; int conttype; } names[] = { + { "encfs", CONTTYPE_ENCFS }, + { "dm-crypt", CONTTYPE_DM_CRYPT } + }; + int i; + + if (!name) + { + log_info ("Known backend types:\n"); + for (i=0; i < DIM (names); i++) + log_info (" %s\n", names[i].name); + return 0; + } + + for (i=0; i < DIM (names); i++) + { + if (!strcmp (names[i].name, name)) + return names[i].conttype; + } + + log_error ("invalid backend type '%s' given\n", name); + return 0; +} + + +/* Return true if CONTTYPE is supported by us. */ +int +be_is_supported_conttype (int conttype) +{ + switch (conttype) + { + case CONTTYPE_ENCFS: + case CONTTYPE_DM_CRYPT: + return 1; + + default: + return 0; + } +} + + +/* Create a lock file for the container FNAME and store the lock at + * R_LOCK and return 0. On error return an error code and store NULL + * at R_LOCK. */ +gpg_error_t +be_take_lock_for_create (ctrl_t ctrl, const char *fname, dotlock_t *r_lock) +{ + gpg_error_t err; + dotlock_t lock = NULL; + struct stat sb; + + *r_lock = NULL; + + /* A DM-crypt container requires special treatment by using the + syshelper functions. */ + if (ctrl->conttype == CONTTYPE_DM_CRYPT) + { + /* */ + err = call_syshelp_set_device (ctrl, fname); + goto leave; + } + + + /* A quick check to see that no container with that name already + exists. */ + if (!gnupg_access (fname, F_OK)) + { + err = gpg_error (GPG_ERR_EEXIST); + goto leave; + } + + /* Take a lock and proceed with the creation. If there is a lock we + immediately return an error because for creation it does not make + sense to wait. */ + lock = dotlock_create (fname, 0); + if (!lock) + { + err = gpg_error_from_syserror (); + goto leave; + } + if (dotlock_take (lock, 0)) + { + err = gpg_error_from_syserror (); + goto leave; + } + + /* Check again that the file does not exist. */ + err = gnupg_stat (fname, &sb)? 0 : gpg_error (GPG_ERR_EEXIST); + + leave: + if (!err) + { + *r_lock = lock; + lock = NULL; + } + dotlock_destroy (lock); + return err; +} + + +/* If the backend requires a separate file or directory for the + container, return its name by computing it from FNAME which gives + the g13 filename. The new file name is allocated and stored at + R_NAME, if this is expected to be a directory true is stored at + R_ISDIR. If no detached name is expected or an error occurs NULL + is stored at R_NAME. The function returns 0 on success or an error + code. */ +gpg_error_t +be_get_detached_name (int conttype, const char *fname, + char **r_name, int *r_isdir) +{ + *r_name = NULL; + *r_isdir = 0; + switch (conttype) + { + case CONTTYPE_ENCFS: + return be_encfs_get_detached_name (fname, r_name, r_isdir); + + case CONTTYPE_DM_CRYPT: + return 0; + + default: + return no_such_backend (conttype); + } +} + + +gpg_error_t +be_create_new_keys (int conttype, membuf_t *mb) +{ + switch (conttype) + { + case CONTTYPE_ENCFS: + return be_encfs_create_new_keys (mb); + + case CONTTYPE_TRUECRYPT: + return be_truecrypt_create_new_keys (mb); + + case CONTTYPE_DM_CRYPT: + return 0; + + default: + return no_such_backend (conttype); + } +} + + +/* Dispatcher to the backend's create function. */ +gpg_error_t +be_create_container (ctrl_t ctrl, int conttype, + const char *fname, int fd, tupledesc_t tuples, + unsigned int *r_id) +{ + (void)fd; /* Not yet used. */ + + switch (conttype) + { + case CONTTYPE_ENCFS: + return be_encfs_create_container (ctrl, fname, tuples, r_id); + + case CONTTYPE_DM_CRYPT: + return be_dmcrypt_create_container (ctrl); + + default: + return no_such_backend (conttype); + } +} + + +/* Dispatcher to the backend's mount function. */ +gpg_error_t +be_mount_container (ctrl_t ctrl, int conttype, + const char *fname, const char *mountpoint, + tupledesc_t tuples, unsigned int *r_id) +{ + switch (conttype) + { + case CONTTYPE_ENCFS: + return be_encfs_mount_container (ctrl, fname, mountpoint, tuples, r_id); + + case CONTTYPE_DM_CRYPT: + return be_dmcrypt_mount_container (ctrl, fname, mountpoint, tuples); + + default: + return no_such_backend (conttype); + } +} + + +/* Dispatcher to the backend's umount function. */ +gpg_error_t +be_umount_container (ctrl_t ctrl, int conttype, const char *fname) +{ + switch (conttype) + { + case CONTTYPE_ENCFS: + return gpg_error (GPG_ERR_NOT_SUPPORTED); + + case CONTTYPE_DM_CRYPT: + return be_dmcrypt_umount_container (ctrl, fname); + + default: + return no_such_backend (conttype); + } +} + + +/* Dispatcher to the backend's suspend function. */ +gpg_error_t +be_suspend_container (ctrl_t ctrl, int conttype, const char *fname) +{ + switch (conttype) + { + case CONTTYPE_ENCFS: + return gpg_error (GPG_ERR_NOT_SUPPORTED); + + case CONTTYPE_DM_CRYPT: + return be_dmcrypt_suspend_container (ctrl, fname); + + default: + return no_such_backend (conttype); + } +} + + +/* Dispatcher to the backend's resume function. */ +gpg_error_t +be_resume_container (ctrl_t ctrl, int conttype, const char *fname, + tupledesc_t tuples) +{ + switch (conttype) + { + case CONTTYPE_ENCFS: + return gpg_error (GPG_ERR_NOT_SUPPORTED); + + case CONTTYPE_DM_CRYPT: + return be_dmcrypt_resume_container (ctrl, fname, tuples); + + default: + return no_such_backend (conttype); + } +} |