citadel/client_passwords.c

   1 /*
   2  * $Id$
   3  *
   4  * Functions which allow the client to remember usernames and passwords for
   5  * various sites.
   6  *
   7  */
   8
   9 #include "sysdep.h"
  10 #include <stdlib.h>
  11 #include <unistd.h>
  12 #include <string.h>
  13 #include <ctype.h>
  14 #include <pwd.h>
  15 #include <sys/types.h>
  16 #include <sys/stat.h>
  17 #include <limits.h>
  18 #include <stdio.h>
  19 #include <libcitadel.h>
  20 #include "citadel.h"
  21 #include "citadel_ipc.h"
  22 #include "commands.h"
  23 #include "client_passwords.h"
  24
  25 #define PWFILENAME "%s/.citadel.passwords"
  26
  27 void determine_pwfilename(char *pwfile, size_t n) {
  28         struct passwd *p;
  29
  30         p = getpwuid(getuid());
  31         if (p == NULL) strcpy(pwfile, "");
  32         snprintf(pwfile, n, PWFILENAME, p->pw_dir);
  33 }
  34
  35
  36 /*
  37  * Check the password file for a host/port match; if found, stuff the user
  38  * name and password into the user/pass buffers
  39  */
  40 void get_stored_password(
  41                 char *host,
  42                 char *port,
  43                 char *username,
  44                 char *password) {
  45
  46         char pwfile[PATH_MAX];
  47         FILE *fp;
  48         char buf[SIZ];
  49         char buf64[SIZ];
  50         char hostbuf[256], portbuf[256], ubuf[256], pbuf[256];
  51
  52         strcpy(username, "");
  53         strcpy(password, "");
  54
  55         determine_pwfilename(pwfile, sizeof pwfile);
  56         if (IsEmptyStr(pwfile)) return;
  57
  58         fp = fopen(pwfile, "r");
  59         if (fp == NULL) return;
  60         while (fgets(buf64, sizeof buf64, fp) != NULL) {
  61                 CtdlDecodeBase64(buf, buf64, sizeof(buf64));
  62                 extract_token(hostbuf, buf, 0, '|', sizeof hostbuf);
  63                 extract_token(portbuf, buf, 1, '|', sizeof portbuf);
  64                 extract_token(ubuf, buf, 2, '|', sizeof ubuf);
  65                 extract_token(pbuf, buf, 3, '|', sizeof pbuf);
  66
  67                 if (!strcasecmp(hostbuf, host)) {
  68                         if (!strcasecmp(portbuf, port)) {
  69                                 strcpy(username, ubuf);
  70                                 strcpy(password, pbuf);
  71                         }
  72                 }
  73         }
  74         fclose(fp);
  75 }
  76
  77
  78 /*
  79  * Set (or clear) stored passwords.
  80  */
  81 void set_stored_password(
  82                 char *host,
  83                 char *port,
  84                 char *username,
  85                 char *password) {
  86
  87         char pwfile[PATH_MAX];
  88         FILE *fp, *oldfp;
  89         char buf[SIZ];
  90         char buf64[SIZ];
  91         char hostbuf[256], portbuf[256], ubuf[256], pbuf[256];
  92
  93         determine_pwfilename(pwfile, sizeof pwfile);
  94         if (IsEmptyStr(pwfile)) return;
  95
  96         oldfp = fopen(pwfile, "r");
  97         if (oldfp == NULL) oldfp = fopen("/dev/null", "r");
  98         unlink(pwfile);
  99         fp = fopen(pwfile, "w");
 100         if (fp == NULL) fp = fopen("/dev/null", "w");
 101         while (fgets(buf64, sizeof buf64, oldfp) != NULL) {
 102                 CtdlDecodeBase64(buf, buf64, sizeof(buf64));
 103                 extract_token(hostbuf, buf, 0, '|', sizeof hostbuf);
 104                 extract_token(portbuf, buf, 1, '|', sizeof portbuf);
 105                 extract_token(ubuf, buf, 2, '|', sizeof ubuf);
 106                 extract_token(pbuf, buf, 3, '|', sizeof pbuf);
 107
 108                 if ( (strcasecmp(hostbuf, host))
 109                    || (strcasecmp(portbuf, port)) ) {
 110                         snprintf(buf, sizeof buf, "%s|%s|%s|%s|",
 111                                 hostbuf, portbuf, ubuf, pbuf);
 112                         CtdlEncodeBase64(buf64, buf, strlen(buf), 0);
 113                         fprintf(fp, "%s\n", buf64);
 114                 }
 115         }
 116         if (!IsEmptyStr(username)) {
 117                 snprintf(buf, sizeof buf, "%s|%s|%s|%s|",
 118                         host, port, username, password);
 119                 CtdlEncodeBase64(buf64, buf, strlen(buf), 0);
 120                 fprintf(fp, "%s\n", buf64);
 121         }
 122         fclose(oldfp);
 123         fclose(fp);
 124         chmod(pwfile, 0600);
 125 }
 126
 127
 128 /*
 129  * Set the password if the user wants to, clear it otherwise
 130  */
 131 void offer_to_remember_password(CtdlIPC *ipc,
 132                 char *host,
 133                 char *port,
 134                 char *username,
 135                 char *password) {
 136
 137         if (rc_remember_passwords) {
 138                 if (boolprompt("Remember username/password for this site", 0)) {
 139                         set_stored_password(host, port, username, password);
 140                 }
 141                 else {
 142                         set_stored_password(host, port, "", "");
 143                 }
 144         }
 145 }