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Diffstat (limited to 'lib/sgetspent.c')
| -rw-r--r-- | lib/sgetspent.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/lib/sgetspent.c b/lib/sgetspent.c new file mode 100644 index 0000000..f1d4b20 --- /dev/null +++ b/lib/sgetspent.c @@ -0,0 +1,187 @@ +/* + * SPDX-FileCopyrightText: 1989 - 1994, Julianne Frances Haugh + * SPDX-FileCopyrightText: 1996 - 1998, Marek Michałkiewicz + * SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko + * SPDX-FileCopyrightText: 2009 , Nicolas François + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <config.h> + +/* Newer versions of Linux libc already have shadow support. */ +#ifndef HAVE_SGETSPENT + +#ident "$Id$" + +#include <sys/types.h> +#include "prototypes.h" +#include "shadowlog_internal.h" +#include "defines.h" +#include <stdio.h> +#define FIELDS 9 +#define OFIELDS 5 +/* + * sgetspent - convert string in shadow file format to (struct spwd *) + */ +struct spwd *sgetspent (const char *string) +{ + static char spwbuf[PASSWD_ENTRY_MAX_LENGTH]; + static struct spwd spwd; + char *fields[FIELDS]; + char *cp; + int i; + + /* + * Copy string to local buffer. It has to be tokenized and we + * have to do that to our private copy. + */ + + if (strlen (string) >= sizeof spwbuf) { + fprintf (shadow_logfd, + "%s: Too long passwd entry encountered, file corruption?\n", + shadow_progname); + return 0; /* fail if too long */ + } + strcpy (spwbuf, string); + + cp = strrchr (spwbuf, '\n'); + if (NULL != cp) { + *cp = '\0'; + } + + /* + * Tokenize the string into colon separated fields. Allow up to + * FIELDS different fields. + */ + + for (cp = spwbuf, i = 0; ('\0' != *cp) && (i < FIELDS); i++) { + fields[i] = cp; + while (('\0' != *cp) && (':' != *cp)) { + cp++; + } + + if ('\0' != *cp) { + *cp = '\0'; + cp++; + } + } + + if (i == (FIELDS - 1)) { + fields[i++] = cp; + } + + if ( ((NULL != cp) && ('\0' != *cp)) || + ((i != FIELDS) && (i != OFIELDS)) ) { + return 0; + } + + /* + * Start populating the structure. The fields are all in + * static storage, as is the structure we pass back. + */ + + spwd.sp_namp = fields[0]; + spwd.sp_pwdp = fields[1]; + + /* + * Get the last changed date. For all of the integer fields, + * we check for proper format. It is an error to have an + * incorrectly formatted number. + */ + + if (fields[2][0] == '\0') { + spwd.sp_lstchg = -1; + } else if ( (getlong (fields[2], &spwd.sp_lstchg) == 0) + || (spwd.sp_lstchg < 0)) { + return 0; + } + + /* + * Get the minimum period between password changes. + */ + + if (fields[3][0] == '\0') { + spwd.sp_min = -1; + } else if ( (getlong (fields[3], &spwd.sp_min) == 0) + || (spwd.sp_min < 0)) { + return 0; + } + + /* + * Get the maximum number of days a password is valid. + */ + + if (fields[4][0] == '\0') { + spwd.sp_max = -1; + } else if ( (getlong (fields[4], &spwd.sp_max) == 0) + || (spwd.sp_max < 0)) { + return 0; + } + + /* + * If there are only OFIELDS fields (this is a SVR3.2 /etc/shadow + * formatted file), initialize the other field members to -1. + */ + + if (i == OFIELDS) { + spwd.sp_warn = -1; + spwd.sp_inact = -1; + spwd.sp_expire = -1; + spwd.sp_flag = SHADOW_SP_FLAG_UNSET; + + return &spwd; + } + + /* + * Get the number of days of password expiry warning. + */ + + if (fields[5][0] == '\0') { + spwd.sp_warn = -1; + } else if ( (getlong (fields[5], &spwd.sp_warn) == 0) + || (spwd.sp_warn < 0)) { + return 0; + } + + /* + * Get the number of days of inactivity before an account is + * disabled. + */ + + if (fields[6][0] == '\0') { + spwd.sp_inact = -1; + } else if ( (getlong (fields[6], &spwd.sp_inact) == 0) + || (spwd.sp_inact < 0)) { + return 0; + } + + /* + * Get the number of days after the epoch before the account is + * set to expire. + */ + + if (fields[7][0] == '\0') { + spwd.sp_expire = -1; + } else if ( (getlong (fields[7], &spwd.sp_expire) == 0) + || (spwd.sp_expire < 0)) { + return 0; + } + + /* + * This field is reserved for future use. But it isn't supposed + * to have anything other than a valid integer in it. + */ + + if (fields[8][0] == '\0') { + spwd.sp_flag = SHADOW_SP_FLAG_UNSET; + } else if (getulong (fields[8], &spwd.sp_flag) == 0) { + return 0; + } + + return (&spwd); +} +#else +extern int errno; /* warning: ANSI C forbids an empty source file */ +#endif + |