diff options
Diffstat (limited to 'agent/simple-pwquery.c')
| -rw-r--r-- | agent/simple-pwquery.c | 486 |
1 files changed, 0 insertions, 486 deletions
diff --git a/agent/simple-pwquery.c b/agent/simple-pwquery.c deleted file mode 100644 index e870122cb..000000000 --- a/agent/simple-pwquery.c +++ /dev/null @@ -1,486 +0,0 @@ -/* simple-pwquery.c - A simple password query client for gpg-agent - * Copyright (C) 2002 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 2 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, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA - */ - -/* This module is intended as a standalone client implementation to - gpg-agent's GET_PASSPHRASE command. In particular it does not use - the Assuan library and can only cope with an already running - gpg-agent. Some stuff is configurable in the header file. */ - -#ifdef HAVE_CONFIG_H -#include <config.h> -#endif -#include <stdlib.h> -#include <stddef.h> -#include <string.h> -#include <errno.h> -#include <unistd.h> -#include <sys/socket.h> -#include <sys/un.h> -#ifdef HAVE_LOCALE_H -#include <locale.h> -#endif - -#define SIMPLE_PWQUERY_IMPLEMENTATION 1 -#include "simple-pwquery.h" - -#if defined(SPWQ_USE_LOGGING) && !defined(HAVE_JNLIB_LOGGING) -# undef SPWQ_USE_LOGGING -#endif - -#ifndef _ -#define _(a) (a) -#endif - -#if !defined (hexdigitp) && !defined (xtoi_2) -#define digitp(p) (*(p) >= '0' && *(p) <= '9') -#define hexdigitp(a) (digitp (a) \ - || (*(a) >= 'A' && *(a) <= 'F') \ - || (*(a) >= 'a' && *(a) <= 'f')) -#define xtoi_1(p) (*(p) <= '9'? (*(p)- '0'): \ - *(p) <= 'F'? (*(p)-'A'+10):(*(p)-'a'+10)) -#define xtoi_2(p) ((xtoi_1(p) * 16) + xtoi_1((p)+1)) -#endif - - -/* Write NBYTES of BUF to file descriptor FD. */ -static int -writen (int fd, const void *buf, size_t nbytes) -{ - size_t nleft = nbytes; - int nwritten; - - while (nleft > 0) - { - nwritten = write( fd, buf, nleft ); - if (nwritten < 0) - { - if (errno == EINTR) - nwritten = 0; - else { -#ifdef SPWQ_USE_LOGGING - log_error ("write failed: %s\n", strerror (errno)); -#endif - return SPWQ_IO_ERROR; - } - } - nleft -= nwritten; - buf = (const char*)buf + nwritten; - } - - return 0; -} - - -/* Read an entire line and return number of bytes read. */ -static int -readline (int fd, char *buf, size_t buflen) -{ - size_t nleft = buflen; - char *p; - int nread = 0; - - while (nleft > 0) - { - int n = read (fd, buf, nleft); - if (n < 0) - { - if (errno == EINTR) - continue; - return -(SPWQ_IO_ERROR); - } - else if (!n) - { - return -(SPWQ_PROTOCOL_ERROR); /* incomplete line */ - } - p = buf; - nleft -= n; - buf += n; - nread += n; - - for (; n && *p != '\n'; n--, p++) - ; - if (n) - { - break; /* at least one full line available - that's enough. - This function is just a simple implementation, so - it is okay to forget about pending bytes */ - } - } - - return nread; -} - - -/* Send an option to the agent */ -static int -agent_send_option (int fd, const char *name, const char *value) -{ - char buf[200]; - int nread; - char *line; - int i; - - line = spwq_malloc (7 + strlen (name) + 1 + strlen (value) + 2); - if (!line) - return SPWQ_OUT_OF_CORE; - strcpy (stpcpy (stpcpy (stpcpy ( - stpcpy (line, "OPTION "), name), "="), value), "\n"); - i = writen (fd, line, strlen (line)); - spwq_free (line); - if (i) - return i; - - /* get response */ - nread = readline (fd, buf, DIM(buf)-1); - if (nread < 0) - return -nread; - if (nread < 3) - return SPWQ_PROTOCOL_ERROR; - - if (buf[0] == 'O' && buf[1] == 'K' && (buf[2] == ' ' || buf[2] == '\n')) - return 0; /* okay */ - - return SPWQ_ERR_RESPONSE; -} - - -/* Send all available options to the agent. */ -static int -agent_send_all_options (int fd) -{ - char *dft_display = NULL; - char *dft_ttyname = NULL; - char *dft_ttytype = NULL; - int rc = 0; - - dft_display = getenv ("DISPLAY"); - if (dft_display) - { - if ((rc = agent_send_option (fd, "display", dft_display))) - return rc; - } - - dft_ttyname = getenv ("GPG_TTY"); - if ((!dft_ttyname || !*dft_ttyname) && ttyname (0)) - dft_ttyname = ttyname (0); - if (dft_ttyname && *dft_ttyname) - { - if ((rc=agent_send_option (fd, "ttyname", dft_ttyname))) - return rc; - } - - dft_ttytype = getenv ("TERM"); - if (dft_ttyname && dft_ttytype) - { - if ((rc = agent_send_option (fd, "ttytype", dft_ttytype))) - return rc; - } - -#if defined(HAVE_SETLOCALE) - { - char *old_lc = NULL; - char *dft_lc = NULL; - -#if defined(LC_CTYPE) - old_lc = setlocale (LC_CTYPE, NULL); - if (old_lc) - { - char *p = spwq_malloc (strlen (old_lc)+1); - if (!p) - return SPWQ_OUT_OF_CORE; - strcpy (p, old_lc); - old_lc = p; - } - dft_lc = setlocale (LC_CTYPE, ""); - if (dft_ttyname && dft_lc) - rc = agent_send_option (fd, "lc-ctype", dft_lc); - if (old_lc) - { - setlocale (LC_CTYPE, old_lc); - spwq_free (old_lc); - } - if (rc) - return rc; -#endif - -#if defined(LC_MESSAGES) - old_lc = setlocale (LC_MESSAGES, NULL); - if (old_lc) - { - char *p = spwq_malloc (strlen (old_lc)+1); - if (!p) - return SPWQ_OUT_OF_CORE; - strcpy (p, old_lc); - old_lc = p; - } - dft_lc = setlocale (LC_MESSAGES, ""); - if (dft_ttyname && dft_lc) - rc = agent_send_option (fd, "lc-messages", dft_lc); - if (old_lc) - { - setlocale (LC_MESSAGES, old_lc); - spwq_free (old_lc); - } - if (rc) - return rc; -#endif - } -#endif /*HAVE_SETLOCALE*/ - - return 0; -} - - - -/* Try to open a connection to the agent, send all options and return - the file descriptor for the connection. Return -1 in case of - error. */ -static int -agent_open (int *rfd) -{ - int rc; - int fd; - char *infostr, *p; - struct sockaddr_un client_addr; - size_t len; - int prot; - char line[200]; - int nread; - - *rfd = -1; - infostr = getenv ( "GPG_AGENT_INFO" ); - if ( !infostr ) - { -#ifdef SPWQ_USE_LOGGING - log_error (_("gpg-agent is not available in this session\n")); -#endif - return SPWQ_NO_AGENT; - } - - if ( !(p = strchr ( infostr, ':')) || p == infostr - || (p-infostr)+1 >= sizeof client_addr.sun_path ) - { -#ifdef SPWQ_USE_LOGGING - log_error ( _("malformed GPG_AGENT_INFO environment variable\n")); -#endif - return SPWQ_NO_AGENT; - } - *p++ = 0; - - while (*p && *p != ':') - p++; - prot = *p? atoi (p+1) : 0; - if ( prot != 1) - { -#ifdef SPWQ_USE_LOGGING - log_error (_("gpg-agent protocol version %d is not supported\n"),prot); -#endif - return SPWQ_PROTOCOL_ERROR; - } - - if( (fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1 ) - { -#ifdef SPWQ_USE_LOGGING - log_error ("can't create socket: %s\n", strerror(errno) ); -#endif - return SPWQ_SYS_ERROR; - } - - memset (&client_addr, 0, sizeof client_addr); - client_addr.sun_family = AF_UNIX; - strcpy (client_addr.sun_path, infostr); - len = (offsetof (struct sockaddr_un, sun_path) - + strlen(client_addr.sun_path) + 1); - - if (connect (fd, (struct sockaddr*)&client_addr, len ) == -1) - { -#ifdef SPWQ_USE_LOGGING - log_error ( _("can't connect to `%s': %s\n"), infostr, strerror (errno)); -#endif - close (fd ); - return SPWQ_IO_ERROR; - } - - nread = readline (fd, line, DIM(line)); - if (nread < 3 || !(line[0] == 'O' && line[1] == 'K' - && (line[2] == '\n' || line[2] == ' ')) ) - { -#ifdef SPWQ_USE_LOGGING - log_error ( _("communication problem with gpg-agent\n")); -#endif - close (fd ); - return SPWQ_PROTOCOL_ERROR; - } - - rc = agent_send_all_options (fd); - if (rc) - { -#ifdef SPWQ_USE_LOGGING - log_error (_("problem setting the gpg-agent options\n")); -#endif - close (fd); - return rc; - } - - *rfd = fd; - return 0; -} - - -/* Copy text to BUFFER and escape as required. Return a poiinter to - the end of the new buffer. NOte that BUFFER must be large enough - to keep the entire text; allocataing it 3 times the size of TEXT - is sufficient. */ -static char * -copy_and_escape (char *buffer, const char *text) -{ - int i; - char *p = buffer; - - for (i=0; text[i]; i++) - { - if (text[i] < ' ' || text[i] == '+') - { - sprintf (p, "%%%02X", text[i]); - p += 3; - } - else if (text[i] == ' ') - *p++ = '+'; - else - *p++ = text[i]; - } - return p; -} - - -/* Ask the gpg-agent for a passphrase and present the user with a - DESCRIPTION, a PROMPT and optiaonlly with a TRYAGAIN extra text. - If a CACHEID is not NULL it is used to locate the passphrase in in - the cache and store it under this ID. If ERRORCODE is not NULL it - should point a variable receiving an errorcode; thsi errocode might - be 0 if the user canceled the operation. The function returns NULL - to indicate an error. */ -char * -simple_pwquery (const char *cacheid, - const char *tryagain, - const char *prompt, - const char *description, - int *errorcode) -{ - int fd = -1; - int nread; - char *result = NULL; - char *pw = NULL; - char *p; - int rc, i; - - rc = agent_open (&fd); - if (rc) - goto leave; - - if (!cacheid) - cacheid = "X"; - if (!tryagain) - tryagain = "X"; - if (!prompt) - prompt = "X"; - if (!description) - description = "X"; - - { - char *line; - /* We allocate 3 times the needed space so that there is enough - space for escaping. */ - line = spwq_malloc (15 - + 3*strlen (cacheid) + 1 - + 3*strlen (tryagain) + 1 - + 3*strlen (prompt) + 1 - + 3*strlen (description) + 1 - + 2); - if (!line) - { - rc = SPWQ_OUT_OF_CORE; - goto leave; - } - strcpy (line, "GET_PASSPHRASE "); - p = line+15; - p = copy_and_escape (p, cacheid); - *p++ = ' '; - p = copy_and_escape (p, tryagain); - *p++ = ' '; - p = copy_and_escape (p, prompt); - *p++ = ' '; - p = copy_and_escape (p, description); - *p++ = '\n'; - rc = writen (fd, line, p - line); - spwq_free (line); - if (rc) - goto leave; - } - - /* get response */ - pw = spwq_secure_malloc (500); - nread = readline (fd, pw, 499); - if (nread < 0) - { - rc = -nread; - goto leave; - } - if (nread < 3) - { - rc = SPWQ_PROTOCOL_ERROR; - goto leave; - } - - if (pw[0] == 'O' && pw[1] == 'K' && pw[2] == ' ') - { /* we got a passphrase - convert it back from hex */ - size_t pwlen = 0; - - for (i=3; i < nread && hexdigitp (pw+i); i+=2) - pw[pwlen++] = xtoi_2 (pw+i); - pw[pwlen] = 0; /* make a C String */ - result = pw; - pw = NULL; - } - else if (nread > 7 && !memcmp (pw, "ERR 111", 7) - && (pw[7] == ' ' || pw[7] == '\n') ) - { -#ifdef SPWQ_USE_LOGGING - log_info (_("canceled by user\n") ); -#endif - *errorcode = 0; /* canceled */ - } - else - { -#ifdef SPWQ_USE_LOGGING - log_error (_("problem with the agent\n")); -#endif - rc = SPWQ_ERR_RESPONSE; - } - - leave: - if (errorcode) - *errorcode = rc; - if (fd != -1) - close (fd); - if (pw) - spwq_free (pw); - return result; -} |