Changeset 3621 in MondoRescue for branches/3.3/mindi-busybox/libbb/correct_password.c
- Timestamp:
- Dec 20, 2016, 4:07:32 PM (7 years ago)
- Location:
- branches/3.3
- Files:
-
- 1 edited
- 1 copied
Legend:
- Unmodified
- Added
- Removed
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branches/3.3/mindi-busybox/libbb/correct_password.c
r3232 r3621 31 31 #include "libbb.h" 32 32 33 /* Ask the user for a password. 34 * Return 1 if the user gives the correct password for entry PW, 35 * 0 if not. Return 1 without asking if PW has an empty password. 36 * 37 * NULL pw means "just fake it for login with bad username" */ 33 #define SHADOW_BUFSIZE 256 38 34 39 int FAST_FUNC correct_password(const struct passwd *pw) 35 /* Retrieve encrypted password string for pw. 36 * If pw == NULL, return a string which fails password check against any 37 * password. 38 */ 39 #if !ENABLE_FEATURE_SHADOWPASSWDS 40 #define get_passwd(pw, buffer) get_passwd(pw) 41 #endif 42 static const char *get_passwd(const struct passwd *pw, char buffer[SHADOW_BUFSIZE]) 40 43 { 41 char *unencrypted, *encrypted; 42 const char *correct; 43 int r; 44 /* fake salt. crypt() can choke otherwise. */ 45 correct = "aa"; 46 if (!pw) { 47 /* "aa" will never match */ 48 goto fake_it; 49 } 50 correct = pw->pw_passwd; 44 const char *pass; 45 46 if (!pw) 47 return "aa"; /* "aa" will never match */ 48 49 pass = pw->pw_passwd; 51 50 #if ENABLE_FEATURE_SHADOWPASSWDS 52 51 /* Using _r function to avoid pulling in static buffers */ 53 if (( correct[0] == 'x' || correct[0] == '*') && !correct[1]) {52 if ((pass[0] == 'x' || pass[0] == '*') && !pass[1]) { 54 53 struct spwd spw; 55 char buffer[256];54 int r; 56 55 /* getspnam_r may return 0 yet set result to NULL. 57 56 * At least glibc 2.4 does this. Be extra paranoid here. */ 58 57 struct spwd *result = NULL; 59 r = getspnam_r(pw->pw_name, &spw, buffer, sizeof(buffer), &result);60 correct= (r || !result) ? "aa" : result->sp_pwdp;58 r = getspnam_r(pw->pw_name, &spw, buffer, SHADOW_BUFSIZE, &result); 59 pass = (r || !result) ? "aa" : result->sp_pwdp; 61 60 } 62 61 #endif 62 return pass; 63 } 63 64 64 if (!correct[0]) /* empty password field? */ 65 /* 66 * Return 1 if PW has an empty password. 67 * Return 1 if the user gives the correct password for entry PW, 68 * 0 if not. 69 * NULL pw means "just fake it for login with bad username" 70 */ 71 int FAST_FUNC check_password(const struct passwd *pw, const char *plaintext) 72 { 73 IF_FEATURE_SHADOWPASSWDS(char buffer[SHADOW_BUFSIZE];) 74 char *encrypted; 75 const char *pw_pass; 76 int r; 77 78 pw_pass = get_passwd(pw, buffer); 79 if (!pw_pass[0]) { /* empty password field? */ 80 return 1; 81 } 82 83 encrypted = pw_encrypt(plaintext, /*salt:*/ pw_pass, 1); 84 r = (strcmp(encrypted, pw_pass) == 0); 85 free(encrypted); 86 return r; 87 } 88 89 90 /* Ask the user for a password. 91 * Return 1 without asking if PW has an empty password. 92 * Return -1 on EOF, error while reading input, or timeout. 93 * Return 1 if the user gives the correct password for entry PW, 94 * 0 if not. 95 * 96 * NULL pw means "just fake it for login with bad username" 97 */ 98 int FAST_FUNC ask_and_check_password_extended(const struct passwd *pw, 99 int timeout, const char *prompt) 100 { 101 IF_FEATURE_SHADOWPASSWDS(char buffer[SHADOW_BUFSIZE];) 102 char *plaintext; 103 const char *pw_pass; 104 int r; 105 106 pw_pass = get_passwd(pw, buffer); 107 if (!pw_pass[0]) /* empty password field? */ 65 108 return 1; 66 109 67 fake_it: 68 unencrypted = bb_ask_stdin("Password: ");69 if (!unencrypted) {70 return 0;110 plaintext = bb_ask(STDIN_FILENO, timeout, prompt); 111 if (!plaintext) { 112 /* EOF (such as ^D) or error (such as ^C) or timeout */ 113 return -1; 71 114 } 72 encrypted = pw_encrypt(unencrypted, correct, 1); 73 r = (strcmp(encrypted, correct) == 0); 74 free(encrypted); 75 memset(unencrypted, 0, strlen(unencrypted)); 115 116 r = check_password(pw, plaintext); 117 nuke_str(plaintext); 76 118 return r; 77 119 } 120 121 int FAST_FUNC ask_and_check_password(const struct passwd *pw) 122 { 123 return ask_and_check_password_extended(pw, 0, "Password: "); 124 }
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