notpass

Unnamed repository; edit this file 'description' to name the repository.
git clone https://git.sebsite.pw/clone/notpass.git
Log | Files | Refs | README | LICENSE

commit ed3040256edd84d78e14f8aa8ab0b78338e86814
Author: Sebastian <sebastian@sebsite.pw>
Date:   Fri, 18 Jun 2021 14:55:18 -0400

Initial commit

Diffstat:
A.gitignore | 1+
ALICENSE | 661+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
AMakefile | 8++++++++
AREADME.md | 48++++++++++++++++++++++++++++++++++++++++++++++++
Aconfig.h | 2++
Alib/tiny-AES-c | 1+
Asrc/config.h | 2++
Asrc/main.c | 387+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
8 files changed, 1110 insertions(+), 0 deletions(-)

diff --git a/.gitignore b/.gitignore @@ -0,0 +1 @@ +np diff --git a/LICENSE b/LICENSE @@ -0,0 +1,661 @@ + GNU AFFERO GENERAL PUBLIC LICENSE + Version 3, 19 November 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/> + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU Affero General Public License is a free, copyleft license for +software and other kinds of works, specifically designed to ensure +cooperation with the community in the case of network server software. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. By contrast, +our General Public Licenses are intended to guarantee your freedom to +share and change all versions of a program--to make sure it remains free +software for all its users. + + When we speak of free software, we are referring to freedom, not +price. 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There are many ways you could offer source, and different +solutions will be better for different programs; see section 13 for the +specific requirements. + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU AGPL, see +<https://www.gnu.org/licenses/>. diff --git a/Makefile b/Makefile @@ -0,0 +1,8 @@ +LIBDIR = lib +INCLUDES = -I$(LIBDIR)/tiny-AES-c +LIBS = -lcrypt +OBJS = $(LIBDIR)/tiny-AES-c/aes.o +CFLAGS = -Wall -Werror -O2 -s -DNDEBUG $(INCLUDES) $(LIBS) + +np: src/*.c src/*.h $(LIBDIR)/tiny-AES-c/* + $(CC) $(CFLAGS) -o $@ $(OBJS) src/*.c diff --git a/README.md b/README.md @@ -0,0 +1,48 @@ +# notpass - a password manager that works i think + +notpass is a password manager with no external dependencies, besides libraries +specified by POSIX such as libc and libcrypt. It is designed to be as simple as +possible, and as such it relies on the filesystem to handle many tasks. + +## Building and Installing + +You'll need a POSIX-compliant implementation of Make (GNU Make works fine), as +well as a C compiler (duh). Edit `config.h` to your liking, and then run `make` +to compile the program. The resulting binary is `np`. The Makefile currently +doesn't have an install target, but you can just `cp` the binary into a +directory in your path to install it. + +## Usage + +Initialize a notpass directory with `np -i`. By default, this initializes it in +the `PWDIR` specified in `config.h`, however, you can supply an additional +argument if you wish to initialize an alternate directory. + +To add a new password entry, run `np -n name`, where `name` is the name of the +entry (for instance, the website name). You will be interactively prompted for +the password to add to this entry. You may optionally supply an additional +argument for an alternative notpass directory to use. + +To retrieve a password entry, run `np name`, where `name` is the name of the +entry. The decrypted password is printed to stdout. You may wish to pipe the +output into another program, such as `xclip`. You may optionally supply an +additional argument for an alternative notpass directory to use. + +All other operations are done by directly manipulating the directory. For +instance, `ls ~/.local/share/notpass` lists all entries in the directory, and +`rm ~/.local/share/notpass/name` removes the `name` entry. This also allows you +to create subdirectories within the root notpass directory, and categorize your +password entries. + +## Bugs + +So far, from my use of notpass, I haven't encountered any bugs. However, bugs +are probably present somewhere, and considering this is written in C, there's +probably a buffer overrun vulnerability you can find if you look hard enough :P. +Needless to say, don't put all your trust into this program that I basically +threw together in a weekend. If you do encounter issues with this software, or +if you want to contribute, please email me at sebastian at sebsite dot pw. :) + +Also, notpass definitely doesn't support non-POSIX operating systems, so like, +Windows is out of the question. Switch to a sane sensible operating system that +doesn't spy on you. diff --git a/config.h b/config.h @@ -0,0 +1 @@ +src/config.h +\ No newline at end of file diff --git a/lib/tiny-AES-c b/lib/tiny-AES-c @@ -0,0 +1 @@ +Subproject commit 12e7744b4919e9d55de75b7ab566326a1c8e7a67 diff --git a/src/config.h b/src/config.h @@ -0,0 +1,2 @@ +/* MUST have a trailing slash! */ +#define PWDIR "/home/sebastian/.local/share/notpass/" diff --git a/src/main.c b/src/main.c @@ -0,0 +1,387 @@ +#define _POSIX_C_SOURCE 200112L + +/* for random() */ +#define _XOPEN_SOURCE 500 + +#include <sys/stat.h> +#include <sys/types.h> + +#include <crypt.h> +#include <fcntl.h> +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <termios.h> +#include <time.h> +#include <unistd.h> + +#define AES256 1 +#include "aes.h" + +#include "config.h" + +#define USAGEMSG \ + "Usage: np {name}\n" \ + " np -i\n" \ + " np -n {name}\n" \ + /*"see np(1) for help\n"*/ + +#define OPENERRMSG \ + "Error opening .notpass file\n" \ + "Did you initialize it with `np -i'?\n" \ + /*"see np(1) for more help\n"*/ + +#if __STDC_VERSION__ < 201112L + +#define _Noreturn + +#if __STDC_VERSION__ < 199901L + +#define inline + +#endif +#endif + +static _Noreturn void +usage(void) +{ + fputs(USAGEMSG, stderr); + exit(EXIT_FAILURE); +} + +static void * +xmalloc(size_t size) +{ + void *ret; + if (!(ret = malloc(size))) { + fputs("Out of memory\n", stderr); + exit(EXIT_FAILURE); + } + return ret; +} + +static char * +randstr(size_t sz) +{ + char *s = xmalloc(sz + 1); + + s[sz] = 0; + while (sz--) { + s[sz] = random() % 64; + if (s[sz] < 12) + s[sz] += '.'; + else if (s[sz] < 38) + s[sz] += 'A' - 12; + else + s[sz] += 'a' - 38; + } + + return s; +} + +static char * +gensalt(void) +{ + char *salt = xmalloc(21); + char *rand = randstr(16); + + memcpy(salt, "$6$", 3); + memcpy(salt + 3, rand, 16); + free(rand); + memcpy(salt + 19, "$", 2); + + return salt; +} + +/* this does not set termios; that must be done before calling this function */ +static enum { VALID, INVALID, ERR } +validate(char **plain_dest) +{ + char buf[256], hashed[107]; + FILE *f; + + /* for consistency. everytime the same master password is entered, + * the entire buffer contents should be identical + */ + memset(buf, 0, 256); + + if (!(f = fopen(PWDIR ".notpass", "r"))) { + fputs(OPENERRMSG, stderr); + return ERR; + } + if (fread(hashed, 1, 107, f) < 107) { + fputs("Error reading .notpass file\n", stderr); + fclose(f); + return ERR; + } + fclose(f); + + fputs("Enter master password: ", stderr); + if (!fgets(buf, 256, stdin)) { + memset(buf, 0, 256); + fputs("Failed to read input\n", stderr); + return ERR; + } + putchar('\n'); + + if (strcmp(crypt(buf, hashed), hashed) == 0) { + *plain_dest = xmalloc(256); + memcpy(*plain_dest, buf, 256); + return VALID; + } else { + memset(buf, 0, 256); + return INVALID; + } +} + +static inline void +init(const char *dir) +{ + struct termios orig_termios, new_termios; + char buf[256], *salt, *hashed, *filename; + ssize_t bytes_written = 0; + size_t len; + int fd; + + /* prevent input from being echoed to the screen. + * orig_termios is restored after the password is validated. + */ + if (tcgetattr(0, &orig_termios) == -1) { + fputs("tcgetattr error\n", stderr); + exit(EXIT_FAILURE); + } + new_termios = orig_termios; + new_termios.c_lflag &= ~ECHO; + if (tcsetattr(0, TCSANOW, &new_termios) == -1) { + fputs("tcsetattr error\n", stderr); + exit(EXIT_FAILURE); + } + + if (dir) { + len = strlen(dir); + filename = xmalloc(len + sizeof(".notpass") + 1); + strcpy(filename, dir); + strcpy(filename + len, dir[len - 1] == '/' + ? ".notpass" + : "/.notpass"); + } else { + filename = PWDIR ".notpass"; + } + + if ((fd = creat(filename, 0600)) == -1) { + tcsetattr(0, TCSAFLUSH, &orig_termios); + fputs("Error creating .notpass file\n", stderr); + exit(EXIT_FAILURE); + } + + salt = gensalt(); + + fputs("Enter new master password: ", stderr); + if (!fgets(buf, 256, stdin)) { + memset(buf, 0, 256); + tcsetattr(0, TCSAFLUSH, &orig_termios); + fputs("Failed to read input\n", stderr); + exit(EXIT_FAILURE); + } + putchar('\n'); + + tcsetattr(0, TCSAFLUSH, &orig_termios); + + hashed = crypt(buf, salt); + memset(buf, 0, 256); + + len = strlen(hashed) + 1; + while ((bytes_written += write(fd, hashed + bytes_written, + len - bytes_written)) < len) { + if (bytes_written >= 0) + continue; + fputs("Failed to write to .notpass file\n", stderr); + exit(EXIT_FAILURE); + } + + close(fd); +} + +static inline void +get(const char *name, const char *dir) +{ + struct AES_ctx aes_ctx; + struct termios orig_termios, new_termios; + char *master, buf[256], iv[AES_BLOCKLEN]; + char *filename = xmalloc(strlen(dir) + strlen(name) + 1); + FILE *f; + + /* prevent input from being echoed to the screen. + * orig_termios is restored after the password is validated. + */ + if (tcgetattr(0, &orig_termios) == -1) { + fputs("tcgetattr error\n", stderr); + exit(EXIT_FAILURE); + } + new_termios = orig_termios; + new_termios.c_lflag &= ~ECHO; + if (tcsetattr(0, TCSANOW, &new_termios) == -1) { + fputs("tcsetattr error\n", stderr); + exit(EXIT_FAILURE); + } + + switch (validate(&master)) { + case VALID: + tcsetattr(0, TCSAFLUSH, &orig_termios); + break; + case INVALID: + fputs("Invalid master password\n", stderr); + /* fallthrough */ + case ERR: + /* in case of error, validate fn already printed error msg */ + tcsetattr(0, TCSAFLUSH, &orig_termios); + exit(EXIT_FAILURE); + } + + strcpy(filename, dir); + strcpy(filename + strlen(dir), name); + + if (!(f = fopen(filename, "r"))) { + memset(master, 0, strlen(master)); + fprintf(stderr, "Failed to open file `%s'\n", filename); + exit(EXIT_FAILURE); + } + if (fread(iv, 1, AES_BLOCKLEN, f) < AES_BLOCKLEN) + goto read_err; + if (fread(buf, 1, 256, f) < 256) + goto read_err; + fclose(f); + + AES_init_ctx_iv(&aes_ctx, (uint8_t *)master, (uint8_t *)iv); + memset(master, 0, 256); + free(master); + AES_CBC_decrypt_buffer(&aes_ctx, (uint8_t *)buf, 256); + + printf("%.*s", 256 - (unsigned char)(buf[255]), buf); + memset(buf, 0, 256); + return; + +read_err: + memset(master, 0, 256); + fprintf(stderr, "Error reading file `%s'\n", filename); + exit(EXIT_FAILURE); +} + +static inline void +new(const char *name, const char *dir) +{ + struct termios orig_termios, new_termios; + struct AES_ctx aes_ctx; + char buf[256], *master, *iv, *filename; + FILE *f; + int fd, i; + + /* prevent input from being echoed to the screen. + * orig_termios is restored after the password is validated. + */ + if (tcgetattr(0, &orig_termios) == -1) { + fputs("tcgetattr error\n", stderr); + exit(EXIT_FAILURE); + } + new_termios = orig_termios; + new_termios.c_lflag &= ~ECHO; + if (tcsetattr(0, TCSANOW, &new_termios) == -1) { + fputs("tcsetattr error\n", stderr); + exit(EXIT_FAILURE); + } + + switch (validate(&master)) { + case VALID: + break; + case INVALID: + fputs("Invalid master password\n", stderr); + /* fallthrough */ + case ERR: + /* in case of error, validate fn already printed error msg */ + tcsetattr(0, TCSAFLUSH, &orig_termios); + exit(EXIT_FAILURE); + } + + fputs("Enter new password entry: ", stderr); + + if (!fgets(buf, 256, stdin)) { + memset(buf, 0, 256); + memset(master, 0, 256); + tcsetattr(0, TCSAFLUSH, &orig_termios); + fputs("Failed to read input\n", stderr); + exit(EXIT_FAILURE); + } + putchar('\n'); + + tcsetattr(0, TCSAFLUSH, &orig_termios); + + /* padding for buf: PKCS #7 */ + for (i = 0; buf[i]; i++); + memset(buf + i, 256 - i, 256 - i); + + iv = randstr(AES_BLOCKLEN); + AES_init_ctx_iv(&aes_ctx, (uint8_t *)master, (uint8_t *)iv); + free(master); + + AES_CBC_encrypt_buffer(&aes_ctx, (uint8_t *)buf, 256); + + filename = xmalloc(strlen(dir) + strlen(name) + 1); + strcpy(filename, dir); + strcpy(filename + strlen(dir), name); + if ((fd = creat(filename, 0600)) == -1) { + fprintf(stderr, "Error creating file `%s'\n", filename); + exit(EXIT_FAILURE); + } + + if (!(f = fdopen(fd, "w"))) { + fprintf(stderr, "Error opening file `%s'\n", filename); + exit(EXIT_FAILURE); + } + if (fwrite(iv, 1, AES_BLOCKLEN, f) < AES_BLOCKLEN) + goto write_err; + free(iv); + if (fwrite(buf, 1, 256, f) < 256) + goto write_err; + + fclose(f); + return; + +write_err: + fprintf(stderr, "Failed to write to file `%s'\n", filename); + exit(EXIT_FAILURE); +} + +int +main(int argc, char **argv) +{ + if (argc < 2) + usage(); + + srandom(time(NULL)); + + if (argv[1][0] == '-') { + switch (argv[1][1]) { + case 'i': /* initialize new key / master password */ + if (argc > 3) + usage(); + + init((argc == 3) ? argv[2] : NULL); + return EXIT_SUCCESS; + case 'n': /* new */ + if (argc > 4 || argv[2][0] == '-') + usage(); + + new(argv[2], (argc == 4) ? argv[3] : PWDIR); + return EXIT_SUCCESS; + default: + usage(); + } + } + + if (argc > 3) + usage(); + + get(argv[1], (argc == 3) ? argv[2] : PWDIR); + return EXIT_SUCCESS; +}