summaryrefslogtreecommitdiffstats
path: root/modules/libmar/sign/nss_secutil.c
blob: 0425191510b84a1232510b8c7e1478ab4523d4e6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* With the exception of GetPasswordString, this file was
   copied from NSS's cmd/lib/secutil.c hg revision 8f011395145e */

#include "nss_secutil.h"

#include "prprf.h"
#ifdef XP_WIN
#  include <io.h>
#else
#  include <unistd.h>
#endif

#if defined(_WINDOWS)
char* quiet_fgets(char* buf, int length, FILE* input) {
  int c;
  char* end = buf;

  /* fflush (input); */
  memset(buf, 0, length);

  if (!isatty(fileno(input))) {
    return fgets(buf, length, input);
  }

  while (1) {
#  if defined(_WIN32_WCE)
    c = getchar(); /* gets a character from stdin */
#  else
    c = getch(); /* getch gets a character from the console */
#  endif
    if (c == '\b') {
      if (end > buf) end--;
    }

    else if (--length > 0)
      *end++ = c;

    if (!c || c == '\n' || c == '\r') break;
  }

  return buf;
}
#endif

char* GetPasswordString(void* arg, char* prompt) {
  FILE* input = stdin;
  char phrase[200] = {'\0'};
  int isInputTerminal = isatty(fileno(stdin));

#ifndef _WINDOWS
  if (isInputTerminal) {
    static char consoleName[] = {
#  ifdef XP_UNIX
        "/dev/tty"
#  else
        "CON:"
#  endif
    };

    input = fopen(consoleName, "r");
    if (input == NULL) {
      fprintf(stderr, "Error opening input terminal for read\n");
      return NULL;
    }
  }
#endif

  if (isInputTerminal) {
    fprintf(stdout, "Please enter your password:\n");
    fflush(stdout);
  }

  if (!QUIET_FGETS(phrase, sizeof(phrase), input)) {
    fprintf(stderr, "QUIET_FGETS failed\n");
#ifndef _WINDOWS
    if (isInputTerminal) {
      fclose(input);
    }
#endif
    return NULL;
  }

  if (isInputTerminal) {
    fprintf(stdout, "\n");
  }

#ifndef _WINDOWS
  if (isInputTerminal) {
    fclose(input);
  }
#endif

  /* Strip off the newlines if present */
  if (phrase[PORT_Strlen(phrase) - 1] == '\n' ||
      phrase[PORT_Strlen(phrase) - 1] == '\r') {
    phrase[PORT_Strlen(phrase) - 1] = 0;
  }
  return (char*)PORT_Strdup(phrase);
}

char* SECU_FilePasswd(PK11SlotInfo* slot, PRBool retry, void* arg) {
  char *phrases, *phrase;
  PRFileDesc* fd;
  int32_t nb;
  char* pwFile = arg;
  int i;
  const long maxPwdFileSize = 4096;
  char* tokenName = NULL;
  int tokenLen = 0;

  if (!pwFile) return 0;

  if (retry) {
    return 0; /* no good retrying - the files contents will be the same */
  }

  phrases = PORT_ZAlloc(maxPwdFileSize);

  if (!phrases) {
    return 0; /* out of memory */
  }

  fd = PR_Open(pwFile, PR_RDONLY, 0);
  if (!fd) {
    fprintf(stderr, "No password file \"%s\" exists.\n", pwFile);
    PORT_Free(phrases);
    return NULL;
  }

  nb = PR_Read(fd, phrases, maxPwdFileSize);

  PR_Close(fd);

  if (nb == 0) {
    fprintf(stderr, "password file contains no data\n");
    PORT_Free(phrases);
    return NULL;
  }

  if (slot) {
    tokenName = PK11_GetTokenName(slot);
    if (tokenName) {
      tokenLen = PORT_Strlen(tokenName);
    }
  }
  i = 0;
  do {
    int startphrase = i;
    int phraseLen;

    /* handle the Windows EOL case */
    while (phrases[i] != '\r' && phrases[i] != '\n' && i < nb) i++;
    /* terminate passphrase */
    if (i < nb) {
      phrases[i++] = '\0';
    }
    /* clean up any EOL before the start of the next passphrase */
    while ((i < nb) && (phrases[i] == '\r' || phrases[i] == '\n')) {
      phrases[i++] = '\0';
    }
    /* now analyze the current passphrase */
    phrase = &phrases[startphrase];
    if (!tokenName) break;
    if (PORT_Strncmp(phrase, tokenName, tokenLen)) continue;
    phraseLen = PORT_Strlen(phrase);
    if (phraseLen < (tokenLen + 1)) continue;
    if (phrase[tokenLen] != ':') continue;
    phrase = &phrase[tokenLen + 1];
    break;

  } while (i < nb);

  phrase = PORT_Strdup((char*)phrase);
  PORT_Free(phrases);
  return phrase;
}

char* SECU_GetModulePassword(PK11SlotInfo* slot, PRBool retry, void* arg) {
  char prompt[255];
  secuPWData* pwdata = (secuPWData*)arg;
  secuPWData pwnull = {PW_NONE, 0};
  secuPWData pwxtrn = {PW_EXTERNAL, "external"};
  char* pw;

  if (pwdata == NULL) pwdata = &pwnull;

  if (PK11_ProtectedAuthenticationPath(slot)) {
    pwdata = &pwxtrn;
  }
  if (retry && pwdata->source != PW_NONE) {
    PR_fprintf(PR_STDERR, "Incorrect password/PIN entered.\n");
    return NULL;
  }

  switch (pwdata->source) {
    case PW_NONE:
      sprintf(prompt,
              "Enter Password or Pin for \"%s\":", PK11_GetTokenName(slot));
      return GetPasswordString(NULL, prompt);
    case PW_FROMFILE:
      /* Instead of opening and closing the file every time, get the pw
       * once, then keep it in memory (duh).
       */
      pw = SECU_FilePasswd(slot, retry, pwdata->data);
      pwdata->source = PW_PLAINTEXT;
      pwdata->data = PL_strdup(pw);
      /* it's already been dup'ed */
      return pw;
    case PW_EXTERNAL:
      sprintf(prompt,
              "Press Enter, then enter PIN for \"%s\" on external device.\n",
              PK11_GetTokenName(slot));
      pw = GetPasswordString(NULL, prompt);
      if (pw) {
        memset(pw, 0, PORT_Strlen(pw));
        PORT_Free(pw);
      }
      /* Fall Through */
    case PW_PLAINTEXT:
      return PL_strdup(pwdata->data);
    default:
      break;
  }

  PR_fprintf(PR_STDERR, "Password check failed:  No password found.\n");
  return NULL;
}