mirror of
https://github.com/sheumann/hush.git
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tar: sanitize option handling
This commit is contained in:
Denis Vlasenko
parent
b833ca9d2d
commit
d031ffa623
204
archival/tar.c
204
archival/tar.c
@ -28,7 +28,7 @@
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#include <fnmatch.h>
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#include <getopt.h>
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#ifdef CONFIG_FEATURE_TAR_CREATE
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#if ENABLE_FEATURE_TAR_CREATE
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/* Tar file constants */
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@ -289,7 +289,7 @@ static int writeTarHeader(struct TarBallInfo *tbInfo,
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return TRUE;
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}
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# ifdef CONFIG_FEATURE_TAR_FROM
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# if ENABLE_FEATURE_TAR_FROM
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static int exclude_file(const llist_t *excluded_files, const char *file)
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{
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while (excluded_files) {
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@ -534,7 +534,7 @@ int writeTarFile(const int tar_fd, const int verboseFlag,
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const llist_t *exclude, const int gzip);
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#endif /* tar_create */
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#ifdef CONFIG_FEATURE_TAR_FROM
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#if ENABLE_FEATURE_TAR_FROM
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static llist_t *append_file_list_to_list(llist_t *list)
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{
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FILE *src_stream;
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@ -562,7 +562,7 @@ static llist_t *append_file_list_to_list(llist_t *list)
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#define append_file_list_to_list(x) 0
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#endif
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#ifdef CONFIG_FEATURE_TAR_COMPRESS
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#if ENABLE_FEATURE_TAR_COMPRESS
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static char get_header_tar_Z(archive_handle_t *archive_handle)
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{
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/* Can't lseek over pipes */
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@ -587,88 +587,38 @@ static char get_header_tar_Z(archive_handle_t *archive_handle)
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#define get_header_tar_Z 0
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#endif
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#define CTX_TEST (1 << 0)
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#define CTX_EXTRACT (1 << 1)
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#define TAR_OPT_BASEDIR (1 << 2)
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#define TAR_OPT_TARNAME (1 << 3)
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#define TAR_OPT_2STDOUT (1 << 4)
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#define TAR_OPT_P (1 << 5)
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#define TAR_OPT_VERBOSE (1 << 6)
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#define TAR_OPT_KEEP_OLD (1 << 7)
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#define TAR_OPT_AFTER_START 8
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#define CTX_CREATE (1 << (TAR_OPT_AFTER_START))
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#define TAR_OPT_DEREFERENCE (1 << (TAR_OPT_AFTER_START + 1))
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#ifdef CONFIG_FEATURE_TAR_CREATE
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# define TAR_OPT_STR_CREATE "ch"
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# define TAR_OPT_AFTER_CREATE TAR_OPT_AFTER_START + 2
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#else
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# define TAR_OPT_STR_CREATE ""
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# define TAR_OPT_AFTER_CREATE TAR_OPT_AFTER_START
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#endif
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#define TAR_OPT_BZIP2 (1 << (TAR_OPT_AFTER_CREATE))
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#ifdef CONFIG_FEATURE_TAR_BZIP2
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# define TAR_OPT_STR_BZIP2 "j"
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# define TAR_OPT_AFTER_BZIP2 TAR_OPT_AFTER_CREATE + 1
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#else
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# define TAR_OPT_STR_BZIP2 ""
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# define TAR_OPT_AFTER_BZIP2 TAR_OPT_AFTER_CREATE
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#endif
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#define TAR_OPT_LZMA (1 << (TAR_OPT_AFTER_BZIP2))
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#ifdef CONFIG_FEATURE_TAR_LZMA
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# define TAR_OPT_STR_LZMA "a"
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# define TAR_OPT_AFTER_LZMA TAR_OPT_AFTER_BZIP2 + 1
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#else
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# define TAR_OPT_STR_LZMA ""
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# define TAR_OPT_AFTER_LZMA TAR_OPT_AFTER_BZIP2
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#endif
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#define TAR_OPT_INCLUDE_FROM (1 << (TAR_OPT_AFTER_LZMA))
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#define TAR_OPT_EXCLUDE_FROM (1 << (TAR_OPT_AFTER_LZMA + 1))
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#ifdef CONFIG_FEATURE_TAR_FROM
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# define TAR_OPT_STR_FROM "T:X:"
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# define TAR_OPT_AFTER_FROM TAR_OPT_AFTER_LZMA + 2
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#else
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# define TAR_OPT_STR_FROM ""
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# define TAR_OPT_AFTER_FROM TAR_OPT_AFTER_LZMA
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#endif
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#define TAR_OPT_GZIP (1 << (TAR_OPT_AFTER_FROM))
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#ifdef CONFIG_FEATURE_TAR_GZIP
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# define TAR_OPT_STR_GZIP "z"
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# define TAR_OPT_AFTER_GZIP TAR_OPT_AFTER_FROM + 1
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#else
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# define TAR_OPT_STR_GZIP ""
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# define TAR_OPT_AFTER_GZIP TAR_OPT_AFTER_FROM
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#endif
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#define TAR_OPT_UNCOMPRESS (1 << (TAR_OPT_AFTER_GZIP))
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#ifdef CONFIG_FEATURE_TAR_COMPRESS
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# define TAR_OPT_STR_COMPRESS "Z"
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# define TAR_OPT_AFTER_COMPRESS TAR_OPT_AFTER_GZIP + 1
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#else
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# define TAR_OPT_STR_COMPRESS ""
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# define TAR_OPT_AFTER_COMPRESS TAR_OPT_AFTER_GZIP
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#endif
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#define TAR_OPT_NOPRESERVE_OWN (1 << (TAR_OPT_AFTER_COMPRESS))
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#define TAR_OPT_NOPRESERVE_PERM (1 << (TAR_OPT_AFTER_COMPRESS + 1))
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#define TAR_OPT_STR_NOPRESERVE "\203\213"
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#define TAR_OPT_AFTER_NOPRESERVE TAR_OPT_AFTER_COMPRESS + 2
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static const char tar_options[] = "txC:f:Opvk" \
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TAR_OPT_STR_CREATE \
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TAR_OPT_STR_BZIP2 \
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TAR_OPT_STR_LZMA \
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TAR_OPT_STR_FROM \
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TAR_OPT_STR_GZIP \
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TAR_OPT_STR_COMPRESS \
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TAR_OPT_STR_NOPRESERVE;
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#ifdef CONFIG_FEATURE_TAR_LONG_OPTIONS
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enum {
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OPTBIT_KEEP_OLD = 7,
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USE_FEATURE_TAR_CREATE( OPTBIT_CREATE ,)
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USE_FEATURE_TAR_CREATE( OPTBIT_DEREFERENCE ,)
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USE_FEATURE_TAR_BZIP2( OPTBIT_BZIP2 ,)
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USE_FEATURE_TAR_LZMA( OPTBIT_LZMA ,)
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USE_FEATURE_TAR_FROM( OPTBIT_INCLUDE_FROM,)
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USE_FEATURE_TAR_FROM( OPTBIT_EXCLUDE_FROM,)
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USE_FEATURE_TAR_GZIP( OPTBIT_GZIP ,)
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USE_FEATURE_TAR_COMPRESS(OPTBIT_COMPRESS ,)
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OPTBIT_NOPRESERVE_OWN,
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OPTBIT_NOPRESERVE_PERM,
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OPT_TEST = 1 << 0, // t
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OPT_EXTRACT = 1 << 1, // x
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OPT_BASEDIR = 1 << 2, // C
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OPT_TARNAME = 1 << 3, // f
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OPT_2STDOUT = 1 << 4, // O
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OPT_P = 1 << 5, // p
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OPT_VERBOSE = 1 << 6, // v
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OPT_KEEP_OLD = 1 << 7, // k
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OPT_CREATE = USE_FEATURE_TAR_CREATE( (1<<OPTBIT_CREATE )) + 0, // c
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OPT_DEREFERENCE = USE_FEATURE_TAR_CREATE( (1<<OPTBIT_DEREFERENCE )) + 0, // h
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OPT_BZIP2 = USE_FEATURE_TAR_BZIP2( (1<<OPTBIT_BZIP2 )) + 0, // j
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OPT_LZMA = USE_FEATURE_TAR_LZMA( (1<<OPTBIT_LZMA )) + 0, // a
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OPT_INCLUDE_FROM = USE_FEATURE_TAR_FROM( (1<<OPTBIT_INCLUDE_FROM)) + 0, // T
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OPT_EXCLUDE_FROM = USE_FEATURE_TAR_FROM( (1<<OPTBIT_EXCLUDE_FROM)) + 0, // X
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OPT_GZIP = USE_FEATURE_TAR_GZIP( (1<<OPTBIT_GZIP )) + 0, // z
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OPT_COMPRESS = USE_FEATURE_TAR_COMPRESS((1<<OPTBIT_COMPRESS )) + 0, // Z
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OPT_NOPRESERVE_OWN = 1 << OPTBIT_NOPRESERVE_OWN , // no-same-owner
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OPT_NOPRESERVE_PERM = 1 << OPTBIT_NOPRESERVE_PERM, // no-same-permissions
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};
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#if ENABLE_FEATURE_TAR_LONG_OPTIONS
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static const struct option tar_long_options[] = {
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{ "list", 0, NULL, 't' },
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{ "extract", 0, NULL, 'x' },
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@ -678,29 +628,29 @@ static const struct option tar_long_options[] = {
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{ "same-permissions", 0, NULL, 'p' },
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{ "verbose", 0, NULL, 'v' },
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{ "keep-old", 0, NULL, 'k' },
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{ "no-same-owner", 0, NULL, '\203' },
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{ "no-same-permissions",0, NULL, '\213' },
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# ifdef CONFIG_FEATURE_TAR_CREATE
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# if ENABLE_FEATURE_TAR_CREATE
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{ "create", 0, NULL, 'c' },
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{ "dereference", 0, NULL, 'h' },
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# endif
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# ifdef CONFIG_FEATURE_TAR_BZIP2
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# if ENABLE_FEATURE_TAR_BZIP2
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{ "bzip2", 0, NULL, 'j' },
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# endif
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# ifdef CONFIG_FEATURE_TAR_LZMA
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# if ENABLE_FEATURE_TAR_LZMA
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{ "lzma", 0, NULL, 'a' },
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# endif
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# ifdef CONFIG_FEATURE_TAR_FROM
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# if ENABLE_FEATURE_TAR_FROM
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{ "files-from", 1, NULL, 'T' },
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{ "exclude-from", 1, NULL, 'X' },
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{ "exclude", 1, NULL, '\n' },
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{ "exclude", 1, NULL, 0xfd },
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# endif
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# ifdef CONFIG_FEATURE_TAR_GZIP
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# if ENABLE_FEATURE_TAR_GZIP
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{ "gzip", 0, NULL, 'z' },
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# endif
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# ifdef CONFIG_FEATURE_TAR_COMPRESS
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# if ENABLE_FEATURE_TAR_COMPRESS
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{ "compress", 0, NULL, 'Z' },
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# endif
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{ "no-same-owner", 0, NULL, 0xfe },
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{ "no-same-permissions",0, NULL, 0xff },
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{ 0, 0, 0, 0 }
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};
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#else
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@ -718,25 +668,37 @@ int tar_main(int argc, char **argv)
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/* Initialise default values */
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tar_handle = init_handle();
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tar_handle->flags = ARCHIVE_CREATE_LEADING_DIRS | ARCHIVE_PRESERVE_DATE | ARCHIVE_EXTRACT_UNCONDITIONAL;
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tar_handle->flags = ARCHIVE_CREATE_LEADING_DIRS
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| ARCHIVE_PRESERVE_DATE
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| ARCHIVE_EXTRACT_UNCONDITIONAL;
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/* Prepend '-' to the first argument if required */
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opt_complementary = ENABLE_FEATURE_TAR_CREATE ?
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"--:X::T::\n::c:t:x:?:c--tx:t--cx:x--ct" :
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"--:X::T::\n::t:x:?:t--x:x--t";
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opt_complementary = "--:" // first arg is options
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"?:" // bail out with usage instead of error return
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"X::T::" // cumulative lists
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"\xfd::" // cumulative lists for --exclude
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USE_FEATURE_TAR_CREATE("c:") "t:x:" // at least one of these is reqd
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USE_FEATURE_TAR_CREATE("c--tx:t--cx:x--ct") // mutually exclusive
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SKIP_FEATURE_TAR_CREATE("t--x:x--t"); // mutually exclusive
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if (ENABLE_FEATURE_TAR_LONG_OPTIONS)
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applet_long_options = tar_long_options;
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opt = getopt32(argc, argv, tar_options,
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&base_dir, /* Change to dir <optarg> */
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&tar_filename /* archive filename */
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#ifdef CONFIG_FEATURE_TAR_FROM
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, &(tar_handle->accept),
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&(tar_handle->reject),
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&excludes
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#endif
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opt = getopt32(argc, argv,
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"txC:f:Opvk"
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USE_FEATURE_TAR_CREATE( "ch" )
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USE_FEATURE_TAR_BZIP2( "j" )
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USE_FEATURE_TAR_LZMA( "a" )
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USE_FEATURE_TAR_FROM( "T:X:")
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USE_FEATURE_TAR_GZIP( "z" )
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USE_FEATURE_TAR_COMPRESS("Z" )
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,
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&base_dir, // -C dir
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&tar_filename, // -f filename
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USE_FEATURE_TAR_FROM(&(tar_handle->accept),) // T
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USE_FEATURE_TAR_FROM(&(tar_handle->reject),) // X
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USE_FEATURE_TAR_FROM(&excludes ) // --exclude
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);
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if (opt & CTX_TEST) {
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if (opt & OPT_TEST) {
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if (tar_handle->action_header == header_list
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|| tar_handle->action_header == header_verbose_list
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) {
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@ -744,13 +706,13 @@ int tar_main(int argc, char **argv)
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} else
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tar_handle->action_header = header_list;
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}
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if ((opt & CTX_EXTRACT) && tar_handle->action_data != data_extract_to_stdout)
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if ((opt & OPT_EXTRACT) && tar_handle->action_data != data_extract_to_stdout)
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tar_handle->action_data = data_extract_all;
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if (opt & TAR_OPT_2STDOUT)
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if (opt & OPT_2STDOUT)
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tar_handle->action_data = data_extract_to_stdout;
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if (opt & TAR_OPT_VERBOSE) {
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if (opt & OPT_VERBOSE) {
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if (tar_handle->action_header == header_list
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|| tar_handle->action_header == header_verbose_list
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) {
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@ -758,25 +720,25 @@ int tar_main(int argc, char **argv)
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} else
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tar_handle->action_header = header_list;
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}
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if (opt & TAR_OPT_KEEP_OLD)
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if (opt & OPT_KEEP_OLD)
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tar_handle->flags &= ~ARCHIVE_EXTRACT_UNCONDITIONAL;
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if (opt & TAR_OPT_NOPRESERVE_OWN)
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if (opt & OPT_NOPRESERVE_OWN)
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tar_handle->flags |= ARCHIVE_NOPRESERVE_OWN;
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if (opt & TAR_OPT_NOPRESERVE_PERM)
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if (opt & OPT_NOPRESERVE_PERM)
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tar_handle->flags |= ARCHIVE_NOPRESERVE_PERM;
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if (ENABLE_FEATURE_TAR_GZIP && (opt & TAR_OPT_GZIP))
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if (opt & OPT_GZIP)
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get_header_ptr = get_header_tar_gz;
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if (ENABLE_FEATURE_TAR_BZIP2 && (opt & TAR_OPT_BZIP2))
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if (opt & OPT_BZIP2)
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get_header_ptr = get_header_tar_bz2;
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if (ENABLE_FEATURE_TAR_LZMA && (opt & TAR_OPT_LZMA))
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if (opt & OPT_LZMA)
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get_header_ptr = get_header_tar_lzma;
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if (ENABLE_FEATURE_TAR_COMPRESS && (opt & TAR_OPT_UNCOMPRESS))
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if (opt & OPT_COMPRESS)
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get_header_ptr = get_header_tar_Z;
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if (ENABLE_FEATURE_TAR_FROM) {
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@ -816,7 +778,7 @@ int tar_main(int argc, char **argv)
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FILE *tar_stream;
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int flags;
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if (ENABLE_FEATURE_TAR_CREATE && (opt & CTX_CREATE)) {
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if (opt & OPT_CREATE) {
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/* Make sure there is at least one file to tar up. */
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if (tar_handle->accept == NULL)
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bb_error_msg_and_die("empty archive");
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@ -842,7 +804,7 @@ int tar_main(int argc, char **argv)
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xchdir(base_dir);
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/* create an archive */
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if (ENABLE_FEATURE_TAR_CREATE && (opt & CTX_CREATE)) {
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if (opt & OPT_CREATE) {
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int verboseFlag = FALSE;
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int zipMode = 0;
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@ -856,7 +818,7 @@ int tar_main(int argc, char **argv)
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) {
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verboseFlag = TRUE;
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}
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writeTarFile(tar_handle->src_fd, verboseFlag, opt & TAR_OPT_DEREFERENCE,
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writeTarFile(tar_handle->src_fd, verboseFlag, opt & OPT_DEREFERENCE,
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tar_handle->accept,
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tar_handle->reject, zipMode);
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/* NB: writeTarFile() closes tar_handle->src_fd */
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@ -147,6 +147,40 @@ const char *opt_complementary
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Special characters:
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"-" A dash as the first char in a opt_complementary group forces
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all arguments to be treated as options, even if they have
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no leading dashes. Next char in this case can't be a digit (0-9),
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use ':' or end of line. For example:
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opt_complementary = "-:w-x:x-w";
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getopt32(argc, argv, "wx");
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Allows any arguments to be given without a dash (./program w x)
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as well as with a dash (./program -x).
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"--" A double dash at the beginning of opt_complementary means the
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argv[1] string should always be treated as options, even if it isn't
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prefixed with a "-". This is useful for special syntax in applets
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such as "ar" and "tar":
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tar xvf foo.tar
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"-N" A dash as the first char in a opt_complementary group followed
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by a single digit (0-9) means that at least N non-option
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arguments must be present on the command line
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"=N" An equal sign as the first char in a opt_complementary group followed
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by a single digit (0-9) means that exactly N non-option
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arguments must be present on the command line
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"?N" A "?" as the first char in a opt_complementary group followed
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by a single digit (0-9) means that at most N arguments must be present
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on the command line.
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"V-" An option with dash before colon or end-of-line results in
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bb_show_usage being called if this option is encountered.
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This is typically used to implement "print verbose usage message
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and exit" option.
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"-" A dash between two options causes the second of the two
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to be unset (and ignored) if it is given on the command line.
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@ -173,30 +207,6 @@ Special characters:
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if (opt & 4)
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printf("Detected odd -x usage\n");
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"-" A dash as the first char in a opt_complementary group forces
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all arguments to be treated as options, even if they have
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no leading dashes. Next char in this case can't be a digit (0-9),
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use ':' or end of line. For example:
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opt_complementary = "-:w-x:x-w";
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getopt32(argc, argv, "wx");
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Allows any arguments to be given without a dash (./program w x)
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as well as with a dash (./program -x).
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"-N" A dash as the first char in a opt_complementary group followed
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by a single digit (0-9) means that at least N non-option
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arguments must be present on the command line
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|
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"=N" An equal sign as the first char in a opt_complementary group followed
|
||||
by a single digit (0-9) means that exactly N non-option
|
||||
arguments must be present on the command line
|
||||
|
||||
"V-" An option with dash before colon or end-of-line results in
|
||||
bb_show_usage being called if this option is encountered.
|
||||
This is typically used to implement "print verbose usage message
|
||||
and exit" option.
|
||||
|
||||
"--" A double dash between two options, or between an option and a group
|
||||
of options, means that they are mutually exclusive. Unlike
|
||||
the "-" case above, an error will be forced if the options
|
||||
@ -221,10 +231,6 @@ Special characters:
|
||||
if BB_GETOPT_ERROR is detected, don't return, call bb_show_usage
|
||||
and exit instead. Next char after '?' can't be a digit.
|
||||
|
||||
"?N" A "?" as the first char in a opt_complementary group followed
|
||||
by a single digit (0-9) means that at most N arguments must be present
|
||||
on the command line.
|
||||
|
||||
"::" A double colon after a char in opt_complementary means that the
|
||||
option can occur multiple times. Each occurrence will be saved as
|
||||
a llist_t element instead of char*.
|
||||
@ -245,12 +251,6 @@ Special characters:
|
||||
root:x:0:0:root:/root:/bin/bash
|
||||
user:x:500:500::/home/user:/bin/bash
|
||||
|
||||
"--" A double dash at the beginning of opt_complementary means the
|
||||
argv[1] string should always be treated as options, even if it isn't
|
||||
prefixed with a "-". This is useful for special syntax in applets
|
||||
such as "ar" and "tar":
|
||||
tar xvf foo.tar
|
||||
|
||||
"?" An "?" between an option and a group of options means that
|
||||
at least one of them is required to occur if the first option
|
||||
occurs in preceding command line arguments.
|
||||
|
||||
@ -13,5 +13,5 @@
|
||||
|
||||
/* Busybox mount uses either /proc/mounts or /etc/mtab to
|
||||
* get the list of currently mounted filesystems */
|
||||
const char bb_path_mtab_file[] = USE_FEATURE_MTAB_SUPPORT("/etc/mtab")
|
||||
SKIP_FEATURE_MTAB_SUPPORT("/proc/mounts");
|
||||
const char bb_path_mtab_file[] =
|
||||
USE_FEATURE_MTAB_SUPPORT("/etc/mtab")SKIP_FEATURE_MTAB_SUPPORT("/proc/mounts");
|
||||
|
||||
@ -110,33 +110,31 @@ int safe_strtol(const char *arg, long* value)
|
||||
|
||||
int safe_strtoi(const char *arg, int* value)
|
||||
{
|
||||
if (sizeof(long) == sizeof(int)) {
|
||||
return safe_strtol(arg, (long*)value);
|
||||
} else {
|
||||
int error;
|
||||
long lvalue = *value;
|
||||
long lvalue;
|
||||
if (sizeof(long) == sizeof(int))
|
||||
return safe_strtol(arg, (long*)value);
|
||||
lvalue = *value;
|
||||
error = safe_strtol(arg, &lvalue);
|
||||
if (lvalue < INT_MIN || lvalue > INT_MAX)
|
||||
return 1;
|
||||
*value = (int) lvalue;
|
||||
return error;
|
||||
}
|
||||
}
|
||||
|
||||
int safe_strtou(const char *arg, unsigned* value)
|
||||
{
|
||||
if (sizeof(unsigned long) == sizeof(unsigned)) {
|
||||
return safe_strtoul(arg, (unsigned long*)value);
|
||||
} else {
|
||||
int error;
|
||||
unsigned long lvalue = *value;
|
||||
unsigned long lvalue;
|
||||
if (sizeof(unsigned long) == sizeof(unsigned))
|
||||
return safe_strtoul(arg, (unsigned long*)value);
|
||||
lvalue = *value;
|
||||
error = safe_strtoul(arg, &lvalue);
|
||||
if (lvalue > UINT_MAX)
|
||||
return 1;
|
||||
*value = (unsigned) lvalue;
|
||||
return error;
|
||||
}
|
||||
}
|
||||
|
||||
int BUG_safe_strtou32_unimplemented(void);
|
||||
int safe_strtou32(const char *arg, uint32_t* value)
|
||||
|
||||
@ -261,7 +261,7 @@ int chpst_main(int argc, char **argv)
|
||||
if (applet_name[1] == 'o') softlimit(argc, argv);
|
||||
if (applet_name[0] == 's') setuidgid(argc, argv);
|
||||
if (applet_name[0] == 'e') envuidgid(argc, argv);
|
||||
// otherwise we are.......... chpst
|
||||
// otherwise we are chpst
|
||||
|
||||
{
|
||||
char *m,*d,*o,*p,*f,*c,*r,*t,*n;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user