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unzip: sync with NetBSD upstream to add passphrase support
- Add support for password protected zip archives.
We use memset_s() rather than explicit_bzero() for more portable
(See PR).
- Use success/failure macro in exit()
- Mention ZIPX format in unzip(1)
Submitted by: Mingye Wang and Alex Kozlov (ak@)
PR: 244181
Reviewed by: mizhka
Obtained from: NetBSD
Differential Revision: https://reviews.freebsd.org/D28892
(cherry picked from commit a4724ff481)
This commit is contained in:
Yoshihiro Takahashi
parent
e089402431
commit
cea130c0b8
2 changed files with 66 additions and 10 deletions
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@ -25,7 +25,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd December 12, 2015
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.Dd September 25, 2021
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.Dt UNZIP 1
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.Os
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.Sh NAME
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@ -35,6 +35,8 @@
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.Nm
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.Op Fl aCcfjLlnopqtuvy
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.Op Fl d Ar dir
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.Op Fl x Ar pattern
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.Op Fl P Ar password
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.Ar zipfile
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.Sh DESCRIPTION
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.\" ...
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@ -81,6 +83,10 @@ When extracting files from the zipfile, they are written to stdout.
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The normal output is suppressed as if
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.Fl q
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was specified.
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.It Fl P Ar password
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Extract encrypted files using a password.
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Putting a password on the command line using this option can be
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insecure.
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.It Fl q
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Quiet: print less information while extracting.
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.It Fl t
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@ -172,7 +178,7 @@ utility is only able to process ZIP archives handled by
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.Xr libarchive 3 .
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Depending on the installed version of
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.Xr libarchive 3 ,
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this may or may not include self-extracting archives.
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this may or may not include self-extracting or ZIPX archives.
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.Sh SEE ALSO
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.Xr libarchive 3
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.Sh HISTORY
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@ -51,6 +51,7 @@
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#include <archive.h>
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#include <archive_entry.h>
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#include <readpassphrase.h>
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/* command-line options */
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static int a_opt; /* convert EOL */
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@ -63,6 +64,7 @@ static int L_opt; /* lowercase names */
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static int n_opt; /* never overwrite */
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static int o_opt; /* always overwrite */
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static int p_opt; /* extract to stdout, quiet */
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static char *P_arg; /* passphrase */
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static int q_opt; /* quiet */
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static int t_opt; /* test */
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static int u_opt; /* update */
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@ -95,6 +97,9 @@ static int tty;
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*/
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static int noeol;
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/* for an interactive passphrase input */
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static char *passphrase_buf;
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/* fatal error message + errno */
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static void
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error(const char *fmt, ...)
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@ -109,7 +114,7 @@ error(const char *fmt, ...)
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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fprintf(stderr, ": %s\n", strerror(errno));
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exit(1);
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exit(EXIT_FAILURE);
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}
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/* fatal error message, no errno */
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@ -126,7 +131,7 @@ errorx(const char *fmt, ...)
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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fprintf(stderr, "\n");
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exit(1);
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exit(EXIT_FAILURE);
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}
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/* non-fatal error message + errno */
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@ -854,6 +859,36 @@ test(struct archive *a, struct archive_entry *e)
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return error_count;
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}
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/*
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* Callback function for reading passphrase.
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* Originally from cpio.c and passphrase.c, libarchive.
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*/
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#define PPBUFF_SIZE 1024
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static const char *
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passphrase_callback(struct archive *a, void *_client_data)
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{
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char *p;
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(void)a; /* UNUSED */
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(void)_client_data; /* UNUSED */
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if (passphrase_buf == NULL) {
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passphrase_buf = malloc(PPBUFF_SIZE);
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if (passphrase_buf == NULL) {
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errno = ENOMEM;
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error("malloc()");
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}
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}
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p = readpassphrase("\nEnter password: ", passphrase_buf,
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PPBUFF_SIZE, RPP_ECHO_OFF);
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if (p == NULL && errno != EINTR)
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error("Error reading password");
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return p;
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}
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/*
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* Main loop: open the zipfile, iterate over its contents and decide what
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* to do with each entry.
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@ -870,6 +905,13 @@ unzip(const char *fn)
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error("archive_read_new failed");
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ac(archive_read_support_format_zip(a));
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if (P_arg)
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archive_read_add_passphrase(a, P_arg);
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else
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archive_read_set_passphrase_callback(a, NULL,
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&passphrase_callback);
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ac(archive_read_open_filename(a, fn, 8192));
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if (!zipinfo_mode) {
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@ -925,6 +967,11 @@ unzip(const char *fn)
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ac(archive_read_free(a));
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if (passphrase_buf != NULL) {
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memset_s(passphrase_buf, PPBUFF_SIZE, 0, PPBUFF_SIZE);
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free(passphrase_buf);
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}
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if (t_opt) {
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if (error_count > 0) {
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errorx("%ju checksum error(s) found.", error_count);
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@ -940,9 +987,9 @@ static void
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usage(void)
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{
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fprintf(stderr, "Usage: unzip [-aCcfjLlnopqtuvyZ1] [-d dir] [-x pattern] "
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"zipfile\n");
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exit(1);
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fprintf(stderr, "Usage: unzip [-aCcfjLlnopqtuvyZ1] [-d dir] "
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"[-x pattern] [-P password] zipfile\n");
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exit(EXIT_FAILURE);
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}
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static int
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@ -951,7 +998,7 @@ getopts(int argc, char *argv[])
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int opt;
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optreset = optind = 1;
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while ((opt = getopt(argc, argv, "aCcd:fjLlnopqtuvx:yZ1")) != -1)
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while ((opt = getopt(argc, argv, "aCcd:fjLlnopP:qtuvx:yZ1")) != -1)
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switch (opt) {
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case '1':
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Z1_opt = 1;
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@ -991,6 +1038,9 @@ getopts(int argc, char *argv[])
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case 'p':
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p_opt = 1;
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break;
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case 'P':
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P_arg = optarg;
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break;
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case 'q':
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q_opt = 1;
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break;
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@ -1047,7 +1097,7 @@ main(int argc, char *argv[])
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*/
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if (zipinfo_mode && !Z1_opt) {
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printf("Zipinfo mode needs additional options\n");
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exit(1);
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exit(EXIT_FAILURE);
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}
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if (argc <= nopts)
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@ -1068,5 +1118,5 @@ main(int argc, char *argv[])
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unzip(zipfile);
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exit(0);
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exit(EXIT_SUCCESS);
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}
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